diff options
Diffstat (limited to 'drivers/md/md.c')
| -rw-r--r-- | drivers/md/md.c | 10044 |
1 files changed, 10044 insertions, 0 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c new file mode 100644 index 000000000..8c40c1c39 --- /dev/null +++ b/drivers/md/md.c @@ -0,0 +1,10044 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + md.c : Multiple Devices driver for Linux + Copyright (C) 1998, 1999, 2000 Ingo Molnar + + completely rewritten, based on the MD driver code from Marc Zyngier + + Changes: + + - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar + - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> + - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> + - kerneld support by Boris Tobotras <boris@xtalk.msk.su> + - kmod support by: Cyrus Durgin + - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> + - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> + + - lots of fixes and improvements to the RAID1/RAID5 and generic + RAID code (such as request based resynchronization): + + Neil Brown <neilb@cse.unsw.edu.au>. + + - persistent bitmap code + Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. + + + Errors, Warnings, etc. + Please use: + pr_crit() for error conditions that risk data loss + pr_err() for error conditions that are unexpected, like an IO error + or internal inconsistency + pr_warn() for error conditions that could have been predicated, like + adding a device to an array when it has incompatible metadata + pr_info() for every interesting, very rare events, like an array starting + or stopping, or resync starting or stopping + pr_debug() for everything else. + +*/ + +#include <linux/sched/mm.h> +#include <linux/sched/signal.h> +#include <linux/kthread.h> +#include <linux/blkdev.h> +#include <linux/blk-integrity.h> +#include <linux/badblocks.h> +#include <linux/sysctl.h> +#include <linux/seq_file.h> +#include <linux/fs.h> +#include <linux/poll.h> +#include <linux/ctype.h> +#include <linux/string.h> +#include <linux/hdreg.h> +#include <linux/proc_fs.h> +#include <linux/random.h> +#include <linux/major.h> +#include <linux/module.h> +#include <linux/reboot.h> +#include <linux/file.h> +#include <linux/compat.h> +#include <linux/delay.h> +#include <linux/raid/md_p.h> +#include <linux/raid/md_u.h> +#include <linux/raid/detect.h> +#include <linux/slab.h> +#include <linux/percpu-refcount.h> +#include <linux/part_stat.h> + +#include <trace/events/block.h> +#include "md.h" +#include "md-bitmap.h" +#include "md-cluster.h" + +/* pers_list is a list of registered personalities protected by pers_lock. */ +static LIST_HEAD(pers_list); +static DEFINE_SPINLOCK(pers_lock); + +static const struct kobj_type md_ktype; + +struct md_cluster_operations *md_cluster_ops; +EXPORT_SYMBOL(md_cluster_ops); +static struct module *md_cluster_mod; + +static DECLARE_WAIT_QUEUE_HEAD(resync_wait); +static struct workqueue_struct *md_wq; +static struct workqueue_struct *md_misc_wq; +struct workqueue_struct *md_bitmap_wq; + +static int remove_and_add_spares(struct mddev *mddev, + struct md_rdev *this); +static void mddev_detach(struct mddev *mddev); +static void export_rdev(struct md_rdev *rdev, struct mddev *mddev); +static void md_wakeup_thread_directly(struct md_thread __rcu *thread); + +/* + * Default number of read corrections we'll attempt on an rdev + * before ejecting it from the array. We divide the read error + * count by 2 for every hour elapsed between read errors. + */ +#define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 +/* Default safemode delay: 200 msec */ +#define DEFAULT_SAFEMODE_DELAY ((200 * HZ)/1000 +1) +/* + * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' + * is 1000 KB/sec, so the extra system load does not show up that much. + * Increase it if you want to have more _guaranteed_ speed. Note that + * the RAID driver will use the maximum available bandwidth if the IO + * subsystem is idle. There is also an 'absolute maximum' reconstruction + * speed limit - in case reconstruction slows down your system despite + * idle IO detection. + * + * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. + * or /sys/block/mdX/md/sync_speed_{min,max} + */ + +static int sysctl_speed_limit_min = 1000; +static int sysctl_speed_limit_max = 200000; +static inline int speed_min(struct mddev *mddev) +{ + return mddev->sync_speed_min ? + mddev->sync_speed_min : sysctl_speed_limit_min; +} + +static inline int speed_max(struct mddev *mddev) +{ + return mddev->sync_speed_max ? + mddev->sync_speed_max : sysctl_speed_limit_max; +} + +static void rdev_uninit_serial(struct md_rdev *rdev) +{ + if (!test_and_clear_bit(CollisionCheck, &rdev->flags)) + return; + + kvfree(rdev->serial); + rdev->serial = NULL; +} + +static void rdevs_uninit_serial(struct mddev *mddev) +{ + struct md_rdev *rdev; + + rdev_for_each(rdev, mddev) + rdev_uninit_serial(rdev); +} + +static int rdev_init_serial(struct md_rdev *rdev) +{ + /* serial_nums equals with BARRIER_BUCKETS_NR */ + int i, serial_nums = 1 << ((PAGE_SHIFT - ilog2(sizeof(atomic_t)))); + struct serial_in_rdev *serial = NULL; + + if (test_bit(CollisionCheck, &rdev->flags)) + return 0; + + serial = kvmalloc(sizeof(struct serial_in_rdev) * serial_nums, + GFP_KERNEL); + if (!serial) + return -ENOMEM; + + for (i = 0; i < serial_nums; i++) { + struct serial_in_rdev *serial_tmp = &serial[i]; + + spin_lock_init(&serial_tmp->serial_lock); + serial_tmp->serial_rb = RB_ROOT_CACHED; + init_waitqueue_head(&serial_tmp->serial_io_wait); + } + + rdev->serial = serial; + set_bit(CollisionCheck, &rdev->flags); + + return 0; +} + +static int rdevs_init_serial(struct mddev *mddev) +{ + struct md_rdev *rdev; + int ret = 0; + + rdev_for_each(rdev, mddev) { + ret = rdev_init_serial(rdev); + if (ret) + break; + } + + /* Free all resources if pool is not existed */ + if (ret && !mddev->serial_info_pool) + rdevs_uninit_serial(mddev); + + return ret; +} + +/* + * rdev needs to enable serial stuffs if it meets the conditions: + * 1. it is multi-queue device flaged with writemostly. + * 2. the write-behind mode is enabled. + */ +static int rdev_need_serial(struct md_rdev *rdev) +{ + return (rdev && rdev->mddev->bitmap_info.max_write_behind > 0 && + rdev->bdev->bd_disk->queue->nr_hw_queues != 1 && + test_bit(WriteMostly, &rdev->flags)); +} + +/* + * Init resource for rdev(s), then create serial_info_pool if: + * 1. rdev is the first device which return true from rdev_enable_serial. + * 2. rdev is NULL, means we want to enable serialization for all rdevs. + */ +void mddev_create_serial_pool(struct mddev *mddev, struct md_rdev *rdev, + bool is_suspend) +{ + int ret = 0; + + if (rdev && !rdev_need_serial(rdev) && + !test_bit(CollisionCheck, &rdev->flags)) + return; + + if (!is_suspend) + mddev_suspend(mddev); + + if (!rdev) + ret = rdevs_init_serial(mddev); + else + ret = rdev_init_serial(rdev); + if (ret) + goto abort; + + if (mddev->serial_info_pool == NULL) { + /* + * already in memalloc noio context by + * mddev_suspend() + */ + mddev->serial_info_pool = + mempool_create_kmalloc_pool(NR_SERIAL_INFOS, + sizeof(struct serial_info)); + if (!mddev->serial_info_pool) { + rdevs_uninit_serial(mddev); + pr_err("can't alloc memory pool for serialization\n"); + } + } + +abort: + if (!is_suspend) + mddev_resume(mddev); +} + +/* + * Free resource from rdev(s), and destroy serial_info_pool under conditions: + * 1. rdev is the last device flaged with CollisionCheck. + * 2. when bitmap is destroyed while policy is not enabled. + * 3. for disable policy, the pool is destroyed only when no rdev needs it. + */ +void mddev_destroy_serial_pool(struct mddev *mddev, struct md_rdev *rdev, + bool is_suspend) +{ + if (rdev && !test_bit(CollisionCheck, &rdev->flags)) + return; + + if (mddev->serial_info_pool) { + struct md_rdev *temp; + int num = 0; /* used to track if other rdevs need the pool */ + + if (!is_suspend) + mddev_suspend(mddev); + rdev_for_each(temp, mddev) { + if (!rdev) { + if (!mddev->serialize_policy || + !rdev_need_serial(temp)) + rdev_uninit_serial(temp); + else + num++; + } else if (temp != rdev && + test_bit(CollisionCheck, &temp->flags)) + num++; + } + + if (rdev) + rdev_uninit_serial(rdev); + + if (num) + pr_info("The mempool could be used by other devices\n"); + else { + mempool_destroy(mddev->serial_info_pool); + mddev->serial_info_pool = NULL; + } + if (!is_suspend) + mddev_resume(mddev); + } +} + +static struct ctl_table_header *raid_table_header; + +static struct ctl_table raid_table[] = { + { + .procname = "speed_limit_min", + .data = &sysctl_speed_limit_min, + .maxlen = sizeof(int), + .mode = S_IRUGO|S_IWUSR, + .proc_handler = proc_dointvec, + }, + { + .procname = "speed_limit_max", + .data = &sysctl_speed_limit_max, + .maxlen = sizeof(int), + .mode = S_IRUGO|S_IWUSR, + .proc_handler = proc_dointvec, + }, + { } +}; + +static int start_readonly; + +/* + * The original mechanism for creating an md device is to create + * a device node in /dev and to open it. This causes races with device-close. + * The preferred method is to write to the "new_array" module parameter. + * This can avoid races. + * Setting create_on_open to false disables the original mechanism + * so all the races disappear. + */ +static bool create_on_open = true; + +/* + * We have a system wide 'event count' that is incremented + * on any 'interesting' event, and readers of /proc/mdstat + * can use 'poll' or 'select' to find out when the event + * count increases. + * + * Events are: + * start array, stop array, error, add device, remove device, + * start build, activate spare + */ +static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); +static atomic_t md_event_count; +void md_new_event(void) +{ + atomic_inc(&md_event_count); + wake_up(&md_event_waiters); +} +EXPORT_SYMBOL_GPL(md_new_event); + +/* + * Enables to iterate over all existing md arrays + * all_mddevs_lock protects this list. + */ +static LIST_HEAD(all_mddevs); +static DEFINE_SPINLOCK(all_mddevs_lock); + +/* Rather than calling directly into the personality make_request function, + * IO requests come here first so that we can check if the device is + * being suspended pending a reconfiguration. + * We hold a refcount over the call to ->make_request. By the time that + * call has finished, the bio has been linked into some internal structure + * and so is visible to ->quiesce(), so we don't need the refcount any more. + */ +static bool is_suspended(struct mddev *mddev, struct bio *bio) +{ + if (is_md_suspended(mddev)) + return true; + if (bio_data_dir(bio) != WRITE) + return false; + if (mddev->suspend_lo >= mddev->suspend_hi) + return false; + if (bio->bi_iter.bi_sector >= mddev->suspend_hi) + return false; + if (bio_end_sector(bio) < mddev->suspend_lo) + return false; + return true; +} + +void md_handle_request(struct mddev *mddev, struct bio *bio) +{ +check_suspended: + if (is_suspended(mddev, bio)) { + DEFINE_WAIT(__wait); + /* Bail out if REQ_NOWAIT is set for the bio */ + if (bio->bi_opf & REQ_NOWAIT) { + bio_wouldblock_error(bio); + return; + } + for (;;) { + prepare_to_wait(&mddev->sb_wait, &__wait, + TASK_UNINTERRUPTIBLE); + if (!is_suspended(mddev, bio)) + break; + schedule(); + } + finish_wait(&mddev->sb_wait, &__wait); + } + if (!percpu_ref_tryget_live(&mddev->active_io)) + goto check_suspended; + + if (!mddev->pers->make_request(mddev, bio)) { + percpu_ref_put(&mddev->active_io); + goto check_suspended; + } + + percpu_ref_put(&mddev->active_io); +} +EXPORT_SYMBOL(md_handle_request); + +static void md_submit_bio(struct bio *bio) +{ + const int rw = bio_data_dir(bio); + struct mddev *mddev = bio->bi_bdev->bd_disk->private_data; + + if (mddev == NULL || mddev->pers == NULL) { + bio_io_error(bio); + return; + } + + if (unlikely(test_bit(MD_BROKEN, &mddev->flags)) && (rw == WRITE)) { + bio_io_error(bio); + return; + } + + bio = bio_split_to_limits(bio); + if (!bio) + return; + + if (mddev->ro == MD_RDONLY && unlikely(rw == WRITE)) { + if (bio_sectors(bio) != 0) + bio->bi_status = BLK_STS_IOERR; + bio_endio(bio); + return; + } + + /* bio could be mergeable after passing to underlayer */ + bio->bi_opf &= ~REQ_NOMERGE; + + md_handle_request(mddev, bio); +} + +/* mddev_suspend makes sure no new requests are submitted + * to the device, and that any requests that have been submitted + * are completely handled. + * Once mddev_detach() is called and completes, the module will be + * completely unused. + */ +void mddev_suspend(struct mddev *mddev) +{ + struct md_thread *thread = rcu_dereference_protected(mddev->thread, + lockdep_is_held(&mddev->reconfig_mutex)); + + WARN_ON_ONCE(thread && current == thread->tsk); + if (mddev->suspended++) + return; + wake_up(&mddev->sb_wait); + set_bit(MD_ALLOW_SB_UPDATE, &mddev->flags); + percpu_ref_kill(&mddev->active_io); + + if (mddev->pers && mddev->pers->prepare_suspend) + mddev->pers->prepare_suspend(mddev); + + wait_event(mddev->sb_wait, percpu_ref_is_zero(&mddev->active_io)); + clear_bit_unlock(MD_ALLOW_SB_UPDATE, &mddev->flags); + wait_event(mddev->sb_wait, !test_bit(MD_UPDATING_SB, &mddev->flags)); + + del_timer_sync(&mddev->safemode_timer); + /* restrict memory reclaim I/O during raid array is suspend */ + mddev->noio_flag = memalloc_noio_save(); +} +EXPORT_SYMBOL_GPL(mddev_suspend); + +void mddev_resume(struct mddev *mddev) +{ + lockdep_assert_held(&mddev->reconfig_mutex); + if (--mddev->suspended) + return; + + /* entred the memalloc scope from mddev_suspend() */ + memalloc_noio_restore(mddev->noio_flag); + + percpu_ref_resurrect(&mddev->active_io); + wake_up(&mddev->sb_wait); + + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + md_wakeup_thread(mddev->thread); + md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ +} +EXPORT_SYMBOL_GPL(mddev_resume); + +/* + * Generic flush handling for md + */ + +static void md_end_flush(struct bio *bio) +{ + struct md_rdev *rdev = bio->bi_private; + struct mddev *mddev = rdev->mddev; + + bio_put(bio); + + rdev_dec_pending(rdev, mddev); + + if (atomic_dec_and_test(&mddev->flush_pending)) { + /* The pair is percpu_ref_get() from md_flush_request() */ + percpu_ref_put(&mddev->active_io); + + /* The pre-request flush has finished */ + queue_work(md_wq, &mddev->flush_work); + } +} + +static void md_submit_flush_data(struct work_struct *ws); + +static void submit_flushes(struct work_struct *ws) +{ + struct mddev *mddev = container_of(ws, struct mddev, flush_work); + struct md_rdev *rdev; + + mddev->start_flush = ktime_get_boottime(); + INIT_WORK(&mddev->flush_work, md_submit_flush_data); + atomic_set(&mddev->flush_pending, 1); + rcu_read_lock(); + rdev_for_each_rcu(rdev, mddev) + if (rdev->raid_disk >= 0 && + !test_bit(Faulty, &rdev->flags)) { + struct bio *bi; + + atomic_inc(&rdev->nr_pending); + rcu_read_unlock(); + bi = bio_alloc_bioset(rdev->bdev, 0, + REQ_OP_WRITE | REQ_PREFLUSH, + GFP_NOIO, &mddev->bio_set); + bi->bi_end_io = md_end_flush; + bi->bi_private = rdev; + atomic_inc(&mddev->flush_pending); + submit_bio(bi); + rcu_read_lock(); + } + rcu_read_unlock(); + if (atomic_dec_and_test(&mddev->flush_pending)) + queue_work(md_wq, &mddev->flush_work); +} + +static void md_submit_flush_data(struct work_struct *ws) +{ + struct mddev *mddev = container_of(ws, struct mddev, flush_work); + struct bio *bio = mddev->flush_bio; + + /* + * must reset flush_bio before calling into md_handle_request to avoid a + * deadlock, because other bios passed md_handle_request suspend check + * could wait for this and below md_handle_request could wait for those + * bios because of suspend check + */ + spin_lock_irq(&mddev->lock); + mddev->prev_flush_start = mddev->start_flush; + mddev->flush_bio = NULL; + spin_unlock_irq(&mddev->lock); + wake_up(&mddev->sb_wait); + + if (bio->bi_iter.bi_size == 0) { + /* an empty barrier - all done */ + bio_endio(bio); + } else { + bio->bi_opf &= ~REQ_PREFLUSH; + md_handle_request(mddev, bio); + } +} + +/* + * Manages consolidation of flushes and submitting any flushes needed for + * a bio with REQ_PREFLUSH. Returns true if the bio is finished or is + * being finished in another context. Returns false if the flushing is + * complete but still needs the I/O portion of the bio to be processed. + */ +bool md_flush_request(struct mddev *mddev, struct bio *bio) +{ + ktime_t req_start = ktime_get_boottime(); + spin_lock_irq(&mddev->lock); + /* flush requests wait until ongoing flush completes, + * hence coalescing all the pending requests. + */ + wait_event_lock_irq(mddev->sb_wait, + !mddev->flush_bio || + ktime_before(req_start, mddev->prev_flush_start), + mddev->lock); + /* new request after previous flush is completed */ + if (ktime_after(req_start, mddev->prev_flush_start)) { + WARN_ON(mddev->flush_bio); + /* + * Grab a reference to make sure mddev_suspend() will wait for + * this flush to be done. + * + * md_flush_reqeust() is called under md_handle_request() and + * 'active_io' is already grabbed, hence percpu_ref_is_zero() + * won't pass, percpu_ref_tryget_live() can't be used because + * percpu_ref_kill() can be called by mddev_suspend() + * concurrently. + */ + WARN_ON(percpu_ref_is_zero(&mddev->active_io)); + percpu_ref_get(&mddev->active_io); + mddev->flush_bio = bio; + bio = NULL; + } + spin_unlock_irq(&mddev->lock); + + if (!bio) { + INIT_WORK(&mddev->flush_work, submit_flushes); + queue_work(md_wq, &mddev->flush_work); + } else { + /* flush was performed for some other bio while we waited. */ + if (bio->bi_iter.bi_size == 0) + /* an empty barrier - all done */ + bio_endio(bio); + else { + bio->bi_opf &= ~REQ_PREFLUSH; + return false; + } + } + return true; +} +EXPORT_SYMBOL(md_flush_request); + +static inline struct mddev *mddev_get(struct mddev *mddev) +{ + lockdep_assert_held(&all_mddevs_lock); + + if (test_bit(MD_DELETED, &mddev->flags)) + return NULL; + atomic_inc(&mddev->active); + return mddev; +} + +static void mddev_delayed_delete(struct work_struct *ws); + +void mddev_put(struct mddev *mddev) +{ + if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) + return; + if (!mddev->raid_disks && list_empty(&mddev->disks) && + mddev->ctime == 0 && !mddev->hold_active) { + /* Array is not configured at all, and not held active, + * so destroy it */ + set_bit(MD_DELETED, &mddev->flags); + + /* + * Call queue_work inside the spinlock so that + * flush_workqueue() after mddev_find will succeed in waiting + * for the work to be done. + */ + INIT_WORK(&mddev->del_work, mddev_delayed_delete); + queue_work(md_misc_wq, &mddev->del_work); + } + spin_unlock(&all_mddevs_lock); +} + +static void md_safemode_timeout(struct timer_list *t); + +void mddev_init(struct mddev *mddev) +{ + mutex_init(&mddev->open_mutex); + mutex_init(&mddev->reconfig_mutex); + mutex_init(&mddev->sync_mutex); + mutex_init(&mddev->bitmap_info.mutex); + INIT_LIST_HEAD(&mddev->disks); + INIT_LIST_HEAD(&mddev->all_mddevs); + INIT_LIST_HEAD(&mddev->deleting); + timer_setup(&mddev->safemode_timer, md_safemode_timeout, 0); + atomic_set(&mddev->active, 1); + atomic_set(&mddev->openers, 0); + atomic_set(&mddev->sync_seq, 0); + spin_lock_init(&mddev->lock); + atomic_set(&mddev->flush_pending, 0); + init_waitqueue_head(&mddev->sb_wait); + init_waitqueue_head(&mddev->recovery_wait); + mddev->reshape_position = MaxSector; + mddev->reshape_backwards = 0; + mddev->last_sync_action = "none"; + mddev->resync_min = 0; + mddev->resync_max = MaxSector; + mddev->level = LEVEL_NONE; +} +EXPORT_SYMBOL_GPL(mddev_init); + +static struct mddev *mddev_find_locked(dev_t unit) +{ + struct mddev *mddev; + + list_for_each_entry(mddev, &all_mddevs, all_mddevs) + if (mddev->unit == unit) + return mddev; + + return NULL; +} + +/* find an unused unit number */ +static dev_t mddev_alloc_unit(void) +{ + static int next_minor = 512; + int start = next_minor; + bool is_free = 0; + dev_t dev = 0; + + while (!is_free) { + dev = MKDEV(MD_MAJOR, next_minor); + next_minor++; + if (next_minor > MINORMASK) + next_minor = 0; + if (next_minor == start) + return 0; /* Oh dear, all in use. */ + is_free = !mddev_find_locked(dev); + } + + return dev; +} + +static struct mddev *mddev_alloc(dev_t unit) +{ + struct mddev *new; + int error; + + if (unit && MAJOR(unit) != MD_MAJOR) + unit &= ~((1 << MdpMinorShift) - 1); + + new = kzalloc(sizeof(*new), GFP_KERNEL); + if (!new) + return ERR_PTR(-ENOMEM); + mddev_init(new); + + spin_lock(&all_mddevs_lock); + if (unit) { + error = -EEXIST; + if (mddev_find_locked(unit)) + goto out_free_new; + new->unit = unit; + if (MAJOR(unit) == MD_MAJOR) + new->md_minor = MINOR(unit); + else + new->md_minor = MINOR(unit) >> MdpMinorShift; + new->hold_active = UNTIL_IOCTL; + } else { + error = -ENODEV; + new->unit = mddev_alloc_unit(); + if (!new->unit) + goto out_free_new; + new->md_minor = MINOR(new->unit); + new->hold_active = UNTIL_STOP; + } + + list_add(&new->all_mddevs, &all_mddevs); + spin_unlock(&all_mddevs_lock); + return new; +out_free_new: + spin_unlock(&all_mddevs_lock); + kfree(new); + return ERR_PTR(error); +} + +static void mddev_free(struct mddev *mddev) +{ + spin_lock(&all_mddevs_lock); + list_del(&mddev->all_mddevs); + spin_unlock(&all_mddevs_lock); + + kfree(mddev); +} + +static const struct attribute_group md_redundancy_group; + +void mddev_unlock(struct mddev *mddev) +{ + struct md_rdev *rdev; + struct md_rdev *tmp; + LIST_HEAD(delete); + + if (!list_empty(&mddev->deleting)) + list_splice_init(&mddev->deleting, &delete); + + if (mddev->to_remove) { + /* These cannot be removed under reconfig_mutex as + * an access to the files will try to take reconfig_mutex + * while holding the file unremovable, which leads to + * a deadlock. + * So hold set sysfs_active while the remove in happeing, + * and anything else which might set ->to_remove or my + * otherwise change the sysfs namespace will fail with + * -EBUSY if sysfs_active is still set. + * We set sysfs_active under reconfig_mutex and elsewhere + * test it under the same mutex to ensure its correct value + * is seen. + */ + const struct attribute_group *to_remove = mddev->to_remove; + mddev->to_remove = NULL; + mddev->sysfs_active = 1; + mutex_unlock(&mddev->reconfig_mutex); + + if (mddev->kobj.sd) { + if (to_remove != &md_redundancy_group) + sysfs_remove_group(&mddev->kobj, to_remove); + if (mddev->pers == NULL || + mddev->pers->sync_request == NULL) { + sysfs_remove_group(&mddev->kobj, &md_redundancy_group); + if (mddev->sysfs_action) + sysfs_put(mddev->sysfs_action); + if (mddev->sysfs_completed) + sysfs_put(mddev->sysfs_completed); + if (mddev->sysfs_degraded) + sysfs_put(mddev->sysfs_degraded); + mddev->sysfs_action = NULL; + mddev->sysfs_completed = NULL; + mddev->sysfs_degraded = NULL; + } + } + mddev->sysfs_active = 0; + } else + mutex_unlock(&mddev->reconfig_mutex); + + md_wakeup_thread(mddev->thread); + wake_up(&mddev->sb_wait); + + list_for_each_entry_safe(rdev, tmp, &delete, same_set) { + list_del_init(&rdev->same_set); + kobject_del(&rdev->kobj); + export_rdev(rdev, mddev); + } +} +EXPORT_SYMBOL_GPL(mddev_unlock); + +struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr) +{ + struct md_rdev *rdev; + + rdev_for_each_rcu(rdev, mddev) + if (rdev->desc_nr == nr) + return rdev; + + return NULL; +} +EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu); + +static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev) +{ + struct md_rdev *rdev; + + rdev_for_each(rdev, mddev) + if (rdev->bdev->bd_dev == dev) + return rdev; + + return NULL; +} + +struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev) +{ + struct md_rdev *rdev; + + rdev_for_each_rcu(rdev, mddev) + if (rdev->bdev->bd_dev == dev) + return rdev; + + return NULL; +} +EXPORT_SYMBOL_GPL(md_find_rdev_rcu); + +static struct md_personality *find_pers(int level, char *clevel) +{ + struct md_personality *pers; + list_for_each_entry(pers, &pers_list, list) { + if (level != LEVEL_NONE && pers->level == level) + return pers; + if (strcmp(pers->name, clevel)==0) + return pers; + } + return NULL; +} + +/* return the offset of the super block in 512byte sectors */ +static inline sector_t calc_dev_sboffset(struct md_rdev *rdev) +{ + return MD_NEW_SIZE_SECTORS(bdev_nr_sectors(rdev->bdev)); +} + +static int alloc_disk_sb(struct md_rdev *rdev) +{ + rdev->sb_page = alloc_page(GFP_KERNEL); + if (!rdev->sb_page) + return -ENOMEM; + return 0; +} + +void md_rdev_clear(struct md_rdev *rdev) +{ + if (rdev->sb_page) { + put_page(rdev->sb_page); + rdev->sb_loaded = 0; + rdev->sb_page = NULL; + rdev->sb_start = 0; + rdev->sectors = 0; + } + if (rdev->bb_page) { + put_page(rdev->bb_page); + rdev->bb_page = NULL; + } + badblocks_exit(&rdev->badblocks); +} +EXPORT_SYMBOL_GPL(md_rdev_clear); + +static void super_written(struct bio *bio) +{ + struct md_rdev *rdev = bio->bi_private; + struct mddev *mddev = rdev->mddev; + + if (bio->bi_status) { + pr_err("md: %s gets error=%d\n", __func__, + blk_status_to_errno(bio->bi_status)); + md_error(mddev, rdev); + if (!test_bit(Faulty, &rdev->flags) + && (bio->bi_opf & MD_FAILFAST)) { + set_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags); + set_bit(LastDev, &rdev->flags); + } + } else + clear_bit(LastDev, &rdev->flags); + + bio_put(bio); + + rdev_dec_pending(rdev, mddev); + + if (atomic_dec_and_test(&mddev->pending_writes)) + wake_up(&mddev->sb_wait); +} + +void md_super_write(struct mddev *mddev, struct md_rdev *rdev, + sector_t sector, int size, struct page *page) +{ + /* write first size bytes of page to sector of rdev + * Increment mddev->pending_writes before returning + * and decrement it on completion, waking up sb_wait + * if zero is reached. + * If an error occurred, call md_error + */ + struct bio *bio; + + if (!page) + return; + + if (test_bit(Faulty, &rdev->flags)) + return; + + bio = bio_alloc_bioset(rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev, + 1, + REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH | REQ_FUA, + GFP_NOIO, &mddev->sync_set); + + atomic_inc(&rdev->nr_pending); + + bio->bi_iter.bi_sector = sector; + __bio_add_page(bio, page, size, 0); + bio->bi_private = rdev; + bio->bi_end_io = super_written; + + if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) && + test_bit(FailFast, &rdev->flags) && + !test_bit(LastDev, &rdev->flags)) + bio->bi_opf |= MD_FAILFAST; + + atomic_inc(&mddev->pending_writes); + submit_bio(bio); +} + +int md_super_wait(struct mddev *mddev) +{ + /* wait for all superblock writes that were scheduled to complete */ + wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0); + if (test_and_clear_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags)) + return -EAGAIN; + return 0; +} + +int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, + struct page *page, blk_opf_t opf, bool metadata_op) +{ + struct bio bio; + struct bio_vec bvec; + + if (metadata_op && rdev->meta_bdev) + bio_init(&bio, rdev->meta_bdev, &bvec, 1, opf); + else + bio_init(&bio, rdev->bdev, &bvec, 1, opf); + + if (metadata_op) + bio.bi_iter.bi_sector = sector + rdev->sb_start; + else if (rdev->mddev->reshape_position != MaxSector && + (rdev->mddev->reshape_backwards == + (sector >= rdev->mddev->reshape_position))) + bio.bi_iter.bi_sector = sector + rdev->new_data_offset; + else + bio.bi_iter.bi_sector = sector + rdev->data_offset; + __bio_add_page(&bio, page, size, 0); + + submit_bio_wait(&bio); + + return !bio.bi_status; +} +EXPORT_SYMBOL_GPL(sync_page_io); + +static int read_disk_sb(struct md_rdev *rdev, int size) +{ + if (rdev->sb_loaded) + return 0; + + if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, true)) + goto fail; + rdev->sb_loaded = 1; + return 0; + +fail: + pr_err("md: disabled device %pg, could not read superblock.\n", + rdev->bdev); + return -EINVAL; +} + +static int md_uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) +{ + return sb1->set_uuid0 == sb2->set_uuid0 && + sb1->set_uuid1 == sb2->set_uuid1 && + sb1->set_uuid2 == sb2->set_uuid2 && + sb1->set_uuid3 == sb2->set_uuid3; +} + +static int md_sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) +{ + int ret; + mdp_super_t *tmp1, *tmp2; + + tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); + tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); + + if (!tmp1 || !tmp2) { + ret = 0; + goto abort; + } + + *tmp1 = *sb1; + *tmp2 = *sb2; + + /* + * nr_disks is not constant + */ + tmp1->nr_disks = 0; + tmp2->nr_disks = 0; + + ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); +abort: + kfree(tmp1); + kfree(tmp2); + return ret; +} + +static u32 md_csum_fold(u32 csum) +{ + csum = (csum & 0xffff) + (csum >> 16); + return (csum & 0xffff) + (csum >> 16); +} + +static unsigned int calc_sb_csum(mdp_super_t *sb) +{ + u64 newcsum = 0; + u32 *sb32 = (u32*)sb; + int i; + unsigned int disk_csum, csum; + + disk_csum = sb->sb_csum; + sb->sb_csum = 0; + + for (i = 0; i < MD_SB_BYTES/4 ; i++) + newcsum += sb32[i]; + csum = (newcsum & 0xffffffff) + (newcsum>>32); + +#ifdef CONFIG_ALPHA + /* This used to use csum_partial, which was wrong for several + * reasons including that different results are returned on + * different architectures. It isn't critical that we get exactly + * the same return value as before (we always csum_fold before + * testing, and that removes any differences). However as we + * know that csum_partial always returned a 16bit value on + * alphas, do a fold to maximise conformity to previous behaviour. + */ + sb->sb_csum = md_csum_fold(disk_csum); +#else + sb->sb_csum = disk_csum; +#endif + return csum; +} + +/* + * Handle superblock details. + * We want to be able to handle multiple superblock formats + * so we have a common interface to them all, and an array of + * different handlers. + * We rely on user-space to write the initial superblock, and support + * reading and updating of superblocks. + * Interface methods are: + * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version) + * loads and validates a superblock on dev. + * if refdev != NULL, compare superblocks on both devices + * Return: + * 0 - dev has a superblock that is compatible with refdev + * 1 - dev has a superblock that is compatible and newer than refdev + * so dev should be used as the refdev in future + * -EINVAL superblock incompatible or invalid + * -othererror e.g. -EIO + * + * int validate_super(struct mddev *mddev, struct md_rdev *dev) + * Verify that dev is acceptable into mddev. + * The first time, mddev->raid_disks will be 0, and data from + * dev should be merged in. Subsequent calls check that dev + * is new enough. Return 0 or -EINVAL + * + * void sync_super(struct mddev *mddev, struct md_rdev *dev) + * Update the superblock for rdev with data in mddev + * This does not write to disc. + * + */ + +struct super_type { + char *name; + struct module *owner; + int (*load_super)(struct md_rdev *rdev, + struct md_rdev *refdev, + int minor_version); + int (*validate_super)(struct mddev *mddev, + struct md_rdev *rdev); + void (*sync_super)(struct mddev *mddev, + struct md_rdev *rdev); + unsigned long long (*rdev_size_change)(struct md_rdev *rdev, + sector_t num_sectors); + int (*allow_new_offset)(struct md_rdev *rdev, + unsigned long long new_offset); +}; + +/* + * Check that the given mddev has no bitmap. + * + * This function is called from the run method of all personalities that do not + * support bitmaps. It prints an error message and returns non-zero if mddev + * has a bitmap. Otherwise, it returns 0. + * + */ +int md_check_no_bitmap(struct mddev *mddev) +{ + if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) + return 0; + pr_warn("%s: bitmaps are not supported for %s\n", + mdname(mddev), mddev->pers->name); + return 1; +} +EXPORT_SYMBOL(md_check_no_bitmap); + +/* + * load_super for 0.90.0 + */ +static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) +{ + mdp_super_t *sb; + int ret; + bool spare_disk = true; + + /* + * Calculate the position of the superblock (512byte sectors), + * it's at the end of the disk. + * + * It also happens to be a multiple of 4Kb. + */ + rdev->sb_start = calc_dev_sboffset(rdev); + + ret = read_disk_sb(rdev, MD_SB_BYTES); + if (ret) + return ret; + + ret = -EINVAL; + + sb = page_address(rdev->sb_page); + + if (sb->md_magic != MD_SB_MAGIC) { + pr_warn("md: invalid raid superblock magic on %pg\n", + rdev->bdev); + goto abort; + } + + if (sb->major_version != 0 || + sb->minor_version < 90 || + sb->minor_version > 91) { + pr_warn("Bad version number %d.%d on %pg\n", + sb->major_version, sb->minor_version, rdev->bdev); + goto abort; + } + + if (sb->raid_disks <= 0) + goto abort; + + if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { + pr_warn("md: invalid superblock checksum on %pg\n", rdev->bdev); + goto abort; + } + + rdev->preferred_minor = sb->md_minor; + rdev->data_offset = 0; + rdev->new_data_offset = 0; + rdev->sb_size = MD_SB_BYTES; + rdev->badblocks.shift = -1; + + if (sb->level == LEVEL_MULTIPATH) + rdev->desc_nr = -1; + else + rdev->desc_nr = sb->this_disk.number; + + /* not spare disk, or LEVEL_MULTIPATH */ + if (sb->level == LEVEL_MULTIPATH || + (rdev->desc_nr >= 0 && + rdev->desc_nr < MD_SB_DISKS && + sb->disks[rdev->desc_nr].state & + ((1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))) + spare_disk = false; + + if (!refdev) { + if (!spare_disk) + ret = 1; + else + ret = 0; + } else { + __u64 ev1, ev2; + mdp_super_t *refsb = page_address(refdev->sb_page); + if (!md_uuid_equal(refsb, sb)) { + pr_warn("md: %pg has different UUID to %pg\n", + rdev->bdev, refdev->bdev); + goto abort; + } + if (!md_sb_equal(refsb, sb)) { + pr_warn("md: %pg has same UUID but different superblock to %pg\n", + rdev->bdev, refdev->bdev); + goto abort; + } + ev1 = md_event(sb); + ev2 = md_event(refsb); + + if (!spare_disk && ev1 > ev2) + ret = 1; + else + ret = 0; + } + rdev->sectors = rdev->sb_start; + /* Limit to 4TB as metadata cannot record more than that. + * (not needed for Linear and RAID0 as metadata doesn't + * record this size) + */ + if ((u64)rdev->sectors >= (2ULL << 32) && sb->level >= 1) + rdev->sectors = (sector_t)(2ULL << 32) - 2; + + if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1) + /* "this cannot possibly happen" ... */ + ret = -EINVAL; + + abort: + return ret; +} + +/* + * validate_super for 0.90.0 + */ +static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev) +{ + mdp_disk_t *desc; + mdp_super_t *sb = page_address(rdev->sb_page); + __u64 ev1 = md_event(sb); + + rdev->raid_disk = -1; + clear_bit(Faulty, &rdev->flags); + clear_bit(In_sync, &rdev->flags); + clear_bit(Bitmap_sync, &rdev->flags); + clear_bit(WriteMostly, &rdev->flags); + + if (mddev->raid_disks == 0) { + mddev->major_version = 0; + mddev->minor_version = sb->minor_version; + mddev->patch_version = sb->patch_version; + mddev->external = 0; + mddev->chunk_sectors = sb->chunk_size >> 9; + mddev->ctime = sb->ctime; + mddev->utime = sb->utime; + mddev->level = sb->level; + mddev->clevel[0] = 0; + mddev->layout = sb->layout; + mddev->raid_disks = sb->raid_disks; + mddev->dev_sectors = ((sector_t)sb->size) * 2; + mddev->events = ev1; + mddev->bitmap_info.offset = 0; + mddev->bitmap_info.space = 0; + /* bitmap can use 60 K after the 4K superblocks */ + mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; + mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); + mddev->reshape_backwards = 0; + + if (mddev->minor_version >= 91) { + mddev->reshape_position = sb->reshape_position; + mddev->delta_disks = sb->delta_disks; + mddev->new_level = sb->new_level; + mddev->new_layout = sb->new_layout; + mddev->new_chunk_sectors = sb->new_chunk >> 9; + if (mddev->delta_disks < 0) + mddev->reshape_backwards = 1; + } else { + mddev->reshape_position = MaxSector; + mddev->delta_disks = 0; + mddev->new_level = mddev->level; + mddev->new_layout = mddev->layout; + mddev->new_chunk_sectors = mddev->chunk_sectors; + } + if (mddev->level == 0) + mddev->layout = -1; + + if (sb->state & (1<<MD_SB_CLEAN)) + mddev->recovery_cp = MaxSector; + else { + if (sb->events_hi == sb->cp_events_hi && + sb->events_lo == sb->cp_events_lo) { + mddev->recovery_cp = sb->recovery_cp; + } else + mddev->recovery_cp = 0; + } + + memcpy(mddev->uuid+0, &sb->set_uuid0, 4); + memcpy(mddev->uuid+4, &sb->set_uuid1, 4); + memcpy(mddev->uuid+8, &sb->set_uuid2, 4); + memcpy(mddev->uuid+12,&sb->set_uuid3, 4); + + mddev->max_disks = MD_SB_DISKS; + + if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && + mddev->bitmap_info.file == NULL) { + mddev->bitmap_info.offset = + mddev->bitmap_info.default_offset; + mddev->bitmap_info.space = + mddev->bitmap_info.default_space; + } + + } else if (mddev->pers == NULL) { + /* Insist on good event counter while assembling, except + * for spares (which don't need an event count) */ + ++ev1; + if (sb->disks[rdev->desc_nr].state & ( + (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) + if (ev1 < mddev->events) + return -EINVAL; + } else if (mddev->bitmap) { + /* if adding to array with a bitmap, then we can accept an + * older device ... but not too old. + */ + if (ev1 < mddev->bitmap->events_cleared) + return 0; + if (ev1 < mddev->events) + set_bit(Bitmap_sync, &rdev->flags); + } else { + if (ev1 < mddev->events) + /* just a hot-add of a new device, leave raid_disk at -1 */ + return 0; + } + + if (mddev->level != LEVEL_MULTIPATH) { + desc = sb->disks + rdev->desc_nr; + + if (desc->state & (1<<MD_DISK_FAULTY)) + set_bit(Faulty, &rdev->flags); + else if (desc->state & (1<<MD_DISK_SYNC) /* && + desc->raid_disk < mddev->raid_disks */) { + set_bit(In_sync, &rdev->flags); + rdev->raid_disk = desc->raid_disk; + rdev->saved_raid_disk = desc->raid_disk; + } else if (desc->state & (1<<MD_DISK_ACTIVE)) { + /* active but not in sync implies recovery up to + * reshape position. We don't know exactly where + * that is, so set to zero for now */ + if (mddev->minor_version >= 91) { + rdev->recovery_offset = 0; + rdev->raid_disk = desc->raid_disk; + } + } + if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) + set_bit(WriteMostly, &rdev->flags); + if (desc->state & (1<<MD_DISK_FAILFAST)) + set_bit(FailFast, &rdev->flags); + } else /* MULTIPATH are always insync */ + set_bit(In_sync, &rdev->flags); + return 0; +} + +/* + * sync_super for 0.90.0 + */ +static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev) +{ + mdp_super_t *sb; + struct md_rdev *rdev2; + int next_spare = mddev->raid_disks; + + /* make rdev->sb match mddev data.. + * + * 1/ zero out disks + * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); + * 3/ any empty disks < next_spare become removed + * + * disks[0] gets initialised to REMOVED because + * we cannot be sure from other fields if it has + * been initialised or not. + */ + int i; + int active=0, working=0,failed=0,spare=0,nr_disks=0; + + rdev->sb_size = MD_SB_BYTES; + + sb = page_address(rdev->sb_page); + + memset(sb, 0, sizeof(*sb)); + + sb->md_magic = MD_SB_MAGIC; + sb->major_version = mddev->major_version; + sb->patch_version = mddev->patch_version; + sb->gvalid_words = 0; /* ignored */ + memcpy(&sb->set_uuid0, mddev->uuid+0, 4); + memcpy(&sb->set_uuid1, mddev->uuid+4, 4); + memcpy(&sb->set_uuid2, mddev->uuid+8, 4); + memcpy(&sb->set_uuid3, mddev->uuid+12,4); + + sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX); + sb->level = mddev->level; + sb->size = mddev->dev_sectors / 2; + sb->raid_disks = mddev->raid_disks; + sb->md_minor = mddev->md_minor; + sb->not_persistent = 0; + sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX); + sb->state = 0; + sb->events_hi = (mddev->events>>32); + sb->events_lo = (u32)mddev->events; + + if (mddev->reshape_position == MaxSector) + sb->minor_version = 90; + else { + sb->minor_version = 91; + sb->reshape_position = mddev->reshape_position; + sb->new_level = mddev->new_level; + sb->delta_disks = mddev->delta_disks; + sb->new_layout = mddev->new_layout; + sb->new_chunk = mddev->new_chunk_sectors << 9; + } + mddev->minor_version = sb->minor_version; + if (mddev->in_sync) + { + sb->recovery_cp = mddev->recovery_cp; + sb->cp_events_hi = (mddev->events>>32); + sb->cp_events_lo = (u32)mddev->events; + if (mddev->recovery_cp == MaxSector) + sb->state = (1<< MD_SB_CLEAN); + } else + sb->recovery_cp = 0; + + sb->layout = mddev->layout; + sb->chunk_size = mddev->chunk_sectors << 9; + + if (mddev->bitmap && mddev->bitmap_info.file == NULL) + sb->state |= (1<<MD_SB_BITMAP_PRESENT); + + sb->disks[0].state = (1<<MD_DISK_REMOVED); + rdev_for_each(rdev2, mddev) { + mdp_disk_t *d; + int desc_nr; + int is_active = test_bit(In_sync, &rdev2->flags); + + if (rdev2->raid_disk >= 0 && + sb->minor_version >= 91) + /* we have nowhere to store the recovery_offset, + * but if it is not below the reshape_position, + * we can piggy-back on that. + */ + is_active = 1; + if (rdev2->raid_disk < 0 || + test_bit(Faulty, &rdev2->flags)) + is_active = 0; + if (is_active) + desc_nr = rdev2->raid_disk; + else + desc_nr = next_spare++; + rdev2->desc_nr = desc_nr; + d = &sb->disks[rdev2->desc_nr]; + nr_disks++; + d->number = rdev2->desc_nr; + d->major = MAJOR(rdev2->bdev->bd_dev); + d->minor = MINOR(rdev2->bdev->bd_dev); + if (is_active) + d->raid_disk = rdev2->raid_disk; + else + d->raid_disk = rdev2->desc_nr; /* compatibility */ + if (test_bit(Faulty, &rdev2->flags)) + d->state = (1<<MD_DISK_FAULTY); + else if (is_active) { + d->state = (1<<MD_DISK_ACTIVE); + if (test_bit(In_sync, &rdev2->flags)) + d->state |= (1<<MD_DISK_SYNC); + active++; + working++; + } else { + d->state = 0; + spare++; + working++; + } + if (test_bit(WriteMostly, &rdev2->flags)) + d->state |= (1<<MD_DISK_WRITEMOSTLY); + if (test_bit(FailFast, &rdev2->flags)) + d->state |= (1<<MD_DISK_FAILFAST); + } + /* now set the "removed" and "faulty" bits on any missing devices */ + for (i=0 ; i < mddev->raid_disks ; i++) { + mdp_disk_t *d = &sb->disks[i]; + if (d->state == 0 && d->number == 0) { + d->number = i; + d->raid_disk = i; + d->state = (1<<MD_DISK_REMOVED); + d->state |= (1<<MD_DISK_FAULTY); + failed++; + } + } + sb->nr_disks = nr_disks; + sb->active_disks = active; + sb->working_disks = working; + sb->failed_disks = failed; + sb->spare_disks = spare; + + sb->this_disk = sb->disks[rdev->desc_nr]; + sb->sb_csum = calc_sb_csum(sb); +} + +/* + * rdev_size_change for 0.90.0 + */ +static unsigned long long +super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) +{ + if (num_sectors && num_sectors < rdev->mddev->dev_sectors) + return 0; /* component must fit device */ + if (rdev->mddev->bitmap_info.offset) + return 0; /* can't move bitmap */ + rdev->sb_start = calc_dev_sboffset(rdev); + if (!num_sectors || num_sectors > rdev->sb_start) + num_sectors = rdev->sb_start; + /* Limit to 4TB as metadata cannot record more than that. + * 4TB == 2^32 KB, or 2*2^32 sectors. + */ + if ((u64)num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1) + num_sectors = (sector_t)(2ULL << 32) - 2; + do { + md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, + rdev->sb_page); + } while (md_super_wait(rdev->mddev) < 0); + return num_sectors; +} + +static int +super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset) +{ + /* non-zero offset changes not possible with v0.90 */ + return new_offset == 0; +} + +/* + * version 1 superblock + */ + +static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb) +{ + __le32 disk_csum; + u32 csum; + unsigned long long newcsum; + int size = 256 + le32_to_cpu(sb->max_dev)*2; + __le32 *isuper = (__le32*)sb; + + disk_csum = sb->sb_csum; + sb->sb_csum = 0; + newcsum = 0; + for (; size >= 4; size -= 4) + newcsum += le32_to_cpu(*isuper++); + + if (size == 2) + newcsum += le16_to_cpu(*(__le16*) isuper); + + csum = (newcsum & 0xffffffff) + (newcsum >> 32); + sb->sb_csum = disk_csum; + return cpu_to_le32(csum); +} + +static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) +{ + struct mdp_superblock_1 *sb; + int ret; + sector_t sb_start; + sector_t sectors; + int bmask; + bool spare_disk = true; + + /* + * Calculate the position of the superblock in 512byte sectors. + * It is always aligned to a 4K boundary and + * depeding on minor_version, it can be: + * 0: At least 8K, but less than 12K, from end of device + * 1: At start of device + * 2: 4K from start of device. + */ + switch(minor_version) { + case 0: + sb_start = bdev_nr_sectors(rdev->bdev) - 8 * 2; + sb_start &= ~(sector_t)(4*2-1); + break; + case 1: + sb_start = 0; + break; + case 2: + sb_start = 8; + break; + default: + return -EINVAL; + } + rdev->sb_start = sb_start; + + /* superblock is rarely larger than 1K, but it can be larger, + * and it is safe to read 4k, so we do that + */ + ret = read_disk_sb(rdev, 4096); + if (ret) return ret; + + sb = page_address(rdev->sb_page); + + if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || + sb->major_version != cpu_to_le32(1) || + le32_to_cpu(sb->max_dev) > (4096-256)/2 || + le64_to_cpu(sb->super_offset) != rdev->sb_start || + (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) + return -EINVAL; + + if (calc_sb_1_csum(sb) != sb->sb_csum) { + pr_warn("md: invalid superblock checksum on %pg\n", + rdev->bdev); + return -EINVAL; + } + if (le64_to_cpu(sb->data_size) < 10) { + pr_warn("md: data_size too small on %pg\n", + rdev->bdev); + return -EINVAL; + } + if (sb->pad0 || + sb->pad3[0] || + memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1]))) + /* Some padding is non-zero, might be a new feature */ + return -EINVAL; + + rdev->preferred_minor = 0xffff; + rdev->data_offset = le64_to_cpu(sb->data_offset); + rdev->new_data_offset = rdev->data_offset; + if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) && + (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET)) + rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset); + atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); + + rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; + bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; + if (rdev->sb_size & bmask) + rdev->sb_size = (rdev->sb_size | bmask) + 1; + + if (minor_version + && rdev->data_offset < sb_start + (rdev->sb_size/512)) + return -EINVAL; + if (minor_version + && rdev->new_data_offset < sb_start + (rdev->sb_size/512)) + return -EINVAL; + + if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) + rdev->desc_nr = -1; + else + rdev->desc_nr = le32_to_cpu(sb->dev_number); + + if (!rdev->bb_page) { + rdev->bb_page = alloc_page(GFP_KERNEL); + if (!rdev->bb_page) + return -ENOMEM; + } + if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) && + rdev->badblocks.count == 0) { + /* need to load the bad block list. + * Currently we limit it to one page. + */ + s32 offset; + sector_t bb_sector; + __le64 *bbp; + int i; + int sectors = le16_to_cpu(sb->bblog_size); + if (sectors > (PAGE_SIZE / 512)) + return -EINVAL; + offset = le32_to_cpu(sb->bblog_offset); + if (offset == 0) + return -EINVAL; + bb_sector = (long long)offset; + if (!sync_page_io(rdev, bb_sector, sectors << 9, + rdev->bb_page, REQ_OP_READ, true)) + return -EIO; + bbp = (__le64 *)page_address(rdev->bb_page); + rdev->badblocks.shift = sb->bblog_shift; + for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) { + u64 bb = le64_to_cpu(*bbp); + int count = bb & (0x3ff); + u64 sector = bb >> 10; + sector <<= sb->bblog_shift; + count <<= sb->bblog_shift; + if (bb + 1 == 0) + break; + if (badblocks_set(&rdev->badblocks, sector, count, 1)) + return -EINVAL; + } + } else if (sb->bblog_offset != 0) + rdev->badblocks.shift = 0; + + if ((le32_to_cpu(sb->feature_map) & + (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS))) { + rdev->ppl.offset = (__s16)le16_to_cpu(sb->ppl.offset); + rdev->ppl.size = le16_to_cpu(sb->ppl.size); + rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset; + } + + if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT) && + sb->level != 0) + return -EINVAL; + + /* not spare disk, or LEVEL_MULTIPATH */ + if (sb->level == cpu_to_le32(LEVEL_MULTIPATH) || + (rdev->desc_nr >= 0 && + rdev->desc_nr < le32_to_cpu(sb->max_dev) && + (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX || + le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))) + spare_disk = false; + + if (!refdev) { + if (!spare_disk) + ret = 1; + else + ret = 0; + } else { + __u64 ev1, ev2; + struct mdp_superblock_1 *refsb = page_address(refdev->sb_page); + + if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || + sb->level != refsb->level || + sb->layout != refsb->layout || + sb->chunksize != refsb->chunksize) { + pr_warn("md: %pg has strangely different superblock to %pg\n", + rdev->bdev, + refdev->bdev); + return -EINVAL; + } + ev1 = le64_to_cpu(sb->events); + ev2 = le64_to_cpu(refsb->events); + + if (!spare_disk && ev1 > ev2) + ret = 1; + else + ret = 0; + } + if (minor_version) + sectors = bdev_nr_sectors(rdev->bdev) - rdev->data_offset; + else + sectors = rdev->sb_start; + if (sectors < le64_to_cpu(sb->data_size)) + return -EINVAL; + rdev->sectors = le64_to_cpu(sb->data_size); + return ret; +} + +static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) +{ + struct mdp_superblock_1 *sb = page_address(rdev->sb_page); + __u64 ev1 = le64_to_cpu(sb->events); + + rdev->raid_disk = -1; + clear_bit(Faulty, &rdev->flags); + clear_bit(In_sync, &rdev->flags); + clear_bit(Bitmap_sync, &rdev->flags); + clear_bit(WriteMostly, &rdev->flags); + + if (mddev->raid_disks == 0) { + mddev->major_version = 1; + mddev->patch_version = 0; + mddev->external = 0; + mddev->chunk_sectors = le32_to_cpu(sb->chunksize); + mddev->ctime = le64_to_cpu(sb->ctime); + mddev->utime = le64_to_cpu(sb->utime); + mddev->level = le32_to_cpu(sb->level); + mddev->clevel[0] = 0; + mddev->layout = le32_to_cpu(sb->layout); + mddev->raid_disks = le32_to_cpu(sb->raid_disks); + mddev->dev_sectors = le64_to_cpu(sb->size); + mddev->events = ev1; + mddev->bitmap_info.offset = 0; + mddev->bitmap_info.space = 0; + /* Default location for bitmap is 1K after superblock + * using 3K - total of 4K + */ + mddev->bitmap_info.default_offset = 1024 >> 9; + mddev->bitmap_info.default_space = (4096-1024) >> 9; + mddev->reshape_backwards = 0; + + mddev->recovery_cp = le64_to_cpu(sb->resync_offset); + memcpy(mddev->uuid, sb->set_uuid, 16); + + mddev->max_disks = (4096-256)/2; + + if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && + mddev->bitmap_info.file == NULL) { + mddev->bitmap_info.offset = + (__s32)le32_to_cpu(sb->bitmap_offset); + /* Metadata doesn't record how much space is available. + * For 1.0, we assume we can use up to the superblock + * if before, else to 4K beyond superblock. + * For others, assume no change is possible. + */ + if (mddev->minor_version > 0) + mddev->bitmap_info.space = 0; + else if (mddev->bitmap_info.offset > 0) + mddev->bitmap_info.space = + 8 - mddev->bitmap_info.offset; + else + mddev->bitmap_info.space = + -mddev->bitmap_info.offset; + } + + if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { + mddev->reshape_position = le64_to_cpu(sb->reshape_position); + mddev->delta_disks = le32_to_cpu(sb->delta_disks); + mddev->new_level = le32_to_cpu(sb->new_level); + mddev->new_layout = le32_to_cpu(sb->new_layout); + mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); + if (mddev->delta_disks < 0 || + (mddev->delta_disks == 0 && + (le32_to_cpu(sb->feature_map) + & MD_FEATURE_RESHAPE_BACKWARDS))) + mddev->reshape_backwards = 1; + } else { + mddev->reshape_position = MaxSector; + mddev->delta_disks = 0; + mddev->new_level = mddev->level; + mddev->new_layout = mddev->layout; + mddev->new_chunk_sectors = mddev->chunk_sectors; + } + + if (mddev->level == 0 && + !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT)) + mddev->layout = -1; + + if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL) + set_bit(MD_HAS_JOURNAL, &mddev->flags); + + if (le32_to_cpu(sb->feature_map) & + (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS)) { + if (le32_to_cpu(sb->feature_map) & + (MD_FEATURE_BITMAP_OFFSET | MD_FEATURE_JOURNAL)) + return -EINVAL; + if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) && + (le32_to_cpu(sb->feature_map) & + MD_FEATURE_MULTIPLE_PPLS)) + return -EINVAL; + set_bit(MD_HAS_PPL, &mddev->flags); + } + } else if (mddev->pers == NULL) { + /* Insist of good event counter while assembling, except for + * spares (which don't need an event count) */ + ++ev1; + if (rdev->desc_nr >= 0 && + rdev->desc_nr < le32_to_cpu(sb->max_dev) && + (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX || + le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL)) + if (ev1 < mddev->events) + return -EINVAL; + } else if (mddev->bitmap) { + /* If adding to array with a bitmap, then we can accept an + * older device, but not too old. + */ + if (ev1 < mddev->bitmap->events_cleared) + return 0; + if (ev1 < mddev->events) + set_bit(Bitmap_sync, &rdev->flags); + } else { + if (ev1 < mddev->events) + /* just a hot-add of a new device, leave raid_disk at -1 */ + return 0; + } + if (mddev->level != LEVEL_MULTIPATH) { + int role; + if (rdev->desc_nr < 0 || + rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { + role = MD_DISK_ROLE_SPARE; + rdev->desc_nr = -1; + } else + role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); + switch(role) { + case MD_DISK_ROLE_SPARE: /* spare */ + break; + case MD_DISK_ROLE_FAULTY: /* faulty */ + set_bit(Faulty, &rdev->flags); + break; + case MD_DISK_ROLE_JOURNAL: /* journal device */ + if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) { + /* journal device without journal feature */ + pr_warn("md: journal device provided without journal feature, ignoring the device\n"); + return -EINVAL; + } + set_bit(Journal, &rdev->flags); + rdev->journal_tail = le64_to_cpu(sb->journal_tail); + rdev->raid_disk = 0; + break; + default: + rdev->saved_raid_disk = role; + if ((le32_to_cpu(sb->feature_map) & + MD_FEATURE_RECOVERY_OFFSET)) { + rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); + if (!(le32_to_cpu(sb->feature_map) & + MD_FEATURE_RECOVERY_BITMAP)) + rdev->saved_raid_disk = -1; + } else { + /* + * If the array is FROZEN, then the device can't + * be in_sync with rest of array. + */ + if (!test_bit(MD_RECOVERY_FROZEN, + &mddev->recovery)) + set_bit(In_sync, &rdev->flags); + } + rdev->raid_disk = role; + break; + } + if (sb->devflags & WriteMostly1) + set_bit(WriteMostly, &rdev->flags); + if (sb->devflags & FailFast1) + set_bit(FailFast, &rdev->flags); + if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT) + set_bit(Replacement, &rdev->flags); + } else /* MULTIPATH are always insync */ + set_bit(In_sync, &rdev->flags); + + return 0; +} + +static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev) +{ + struct mdp_superblock_1 *sb; + struct md_rdev *rdev2; + int max_dev, i; + /* make rdev->sb match mddev and rdev data. */ + + sb = page_address(rdev->sb_page); + + sb->feature_map = 0; + sb->pad0 = 0; + sb->recovery_offset = cpu_to_le64(0); + memset(sb->pad3, 0, sizeof(sb->pad3)); + + sb->utime = cpu_to_le64((__u64)mddev->utime); + sb->events = cpu_to_le64(mddev->events); + if (mddev->in_sync) + sb->resync_offset = cpu_to_le64(mddev->recovery_cp); + else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags)) + sb->resync_offset = cpu_to_le64(MaxSector); + else + sb->resync_offset = cpu_to_le64(0); + + sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); + + sb->raid_disks = cpu_to_le32(mddev->raid_disks); + sb->size = cpu_to_le64(mddev->dev_sectors); + sb->chunksize = cpu_to_le32(mddev->chunk_sectors); + sb->level = cpu_to_le32(mddev->level); + sb->layout = cpu_to_le32(mddev->layout); + if (test_bit(FailFast, &rdev->flags)) + sb->devflags |= FailFast1; + else + sb->devflags &= ~FailFast1; + + if (test_bit(WriteMostly, &rdev->flags)) + sb->devflags |= WriteMostly1; + else + sb->devflags &= ~WriteMostly1; + sb->data_offset = cpu_to_le64(rdev->data_offset); + sb->data_size = cpu_to_le64(rdev->sectors); + + if (mddev->bitmap && mddev->bitmap_info.file == NULL) { + sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); + sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); + } + + if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) && + !test_bit(In_sync, &rdev->flags)) { + sb->feature_map |= + cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); + sb->recovery_offset = + cpu_to_le64(rdev->recovery_offset); + if (rdev->saved_raid_disk >= 0 && mddev->bitmap) + sb->feature_map |= + cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP); + } + /* Note: recovery_offset and journal_tail share space */ + if (test_bit(Journal, &rdev->flags)) + sb->journal_tail = cpu_to_le64(rdev->journal_tail); + if (test_bit(Replacement, &rdev->flags)) + sb->feature_map |= + cpu_to_le32(MD_FEATURE_REPLACEMENT); + + if (mddev->reshape_position != MaxSector) { + sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); + sb->reshape_position = cpu_to_le64(mddev->reshape_position); + sb->new_layout = cpu_to_le32(mddev->new_layout); + sb->delta_disks = cpu_to_le32(mddev->delta_disks); + sb->new_level = cpu_to_le32(mddev->new_level); + sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); + if (mddev->delta_disks == 0 && + mddev->reshape_backwards) + sb->feature_map + |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS); + if (rdev->new_data_offset != rdev->data_offset) { + sb->feature_map + |= cpu_to_le32(MD_FEATURE_NEW_OFFSET); + sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset + - rdev->data_offset)); + } + } + + if (mddev_is_clustered(mddev)) + sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED); + + if (rdev->badblocks.count == 0) + /* Nothing to do for bad blocks*/ ; + else if (sb->bblog_offset == 0) + /* Cannot record bad blocks on this device */ + md_error(mddev, rdev); + else { + struct badblocks *bb = &rdev->badblocks; + __le64 *bbp = (__le64 *)page_address(rdev->bb_page); + u64 *p = bb->page; + sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS); + if (bb->changed) { + unsigned seq; + +retry: + seq = read_seqbegin(&bb->lock); + + memset(bbp, 0xff, PAGE_SIZE); + + for (i = 0 ; i < bb->count ; i++) { + u64 internal_bb = p[i]; + u64 store_bb = ((BB_OFFSET(internal_bb) << 10) + | BB_LEN(internal_bb)); + bbp[i] = cpu_to_le64(store_bb); + } + bb->changed = 0; + if (read_seqretry(&bb->lock, seq)) + goto retry; + + bb->sector = (rdev->sb_start + + (int)le32_to_cpu(sb->bblog_offset)); + bb->size = le16_to_cpu(sb->bblog_size); + } + } + + max_dev = 0; + rdev_for_each(rdev2, mddev) + if (rdev2->desc_nr+1 > max_dev) + max_dev = rdev2->desc_nr+1; + + if (max_dev > le32_to_cpu(sb->max_dev)) { + int bmask; + sb->max_dev = cpu_to_le32(max_dev); + rdev->sb_size = max_dev * 2 + 256; + bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; + if (rdev->sb_size & bmask) + rdev->sb_size = (rdev->sb_size | bmask) + 1; + } else + max_dev = le32_to_cpu(sb->max_dev); + + for (i=0; i<max_dev;i++) + sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE); + + if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) + sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL); + + if (test_bit(MD_HAS_PPL, &mddev->flags)) { + if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags)) + sb->feature_map |= + cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS); + else + sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL); + sb->ppl.offset = cpu_to_le16(rdev->ppl.offset); + sb->ppl.size = cpu_to_le16(rdev->ppl.size); + } + + rdev_for_each(rdev2, mddev) { + i = rdev2->desc_nr; + if (test_bit(Faulty, &rdev2->flags)) + sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY); + else if (test_bit(In_sync, &rdev2->flags)) + sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); + else if (test_bit(Journal, &rdev2->flags)) + sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL); + else if (rdev2->raid_disk >= 0) + sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); + else + sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE); + } + + sb->sb_csum = calc_sb_1_csum(sb); +} + +static sector_t super_1_choose_bm_space(sector_t dev_size) +{ + sector_t bm_space; + + /* if the device is bigger than 8Gig, save 64k for bitmap + * usage, if bigger than 200Gig, save 128k + */ + if (dev_size < 64*2) + bm_space = 0; + else if (dev_size - 64*2 >= 200*1024*1024*2) + bm_space = 128*2; + else if (dev_size - 4*2 > 8*1024*1024*2) + bm_space = 64*2; + else + bm_space = 4*2; + return bm_space; +} + +static unsigned long long +super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) +{ + struct mdp_superblock_1 *sb; + sector_t max_sectors; + if (num_sectors && num_sectors < rdev->mddev->dev_sectors) + return 0; /* component must fit device */ + if (rdev->data_offset != rdev->new_data_offset) + return 0; /* too confusing */ + if (rdev->sb_start < rdev->data_offset) { + /* minor versions 1 and 2; superblock before data */ + max_sectors = bdev_nr_sectors(rdev->bdev) - rdev->data_offset; + if (!num_sectors || num_sectors > max_sectors) + num_sectors = max_sectors; + } else if (rdev->mddev->bitmap_info.offset) { + /* minor version 0 with bitmap we can't move */ + return 0; + } else { + /* minor version 0; superblock after data */ + sector_t sb_start, bm_space; + sector_t dev_size = bdev_nr_sectors(rdev->bdev); + + /* 8K is for superblock */ + sb_start = dev_size - 8*2; + sb_start &= ~(sector_t)(4*2 - 1); + + bm_space = super_1_choose_bm_space(dev_size); + + /* Space that can be used to store date needs to decrease + * superblock bitmap space and bad block space(4K) + */ + max_sectors = sb_start - bm_space - 4*2; + + if (!num_sectors || num_sectors > max_sectors) + num_sectors = max_sectors; + rdev->sb_start = sb_start; + } + sb = page_address(rdev->sb_page); + sb->data_size = cpu_to_le64(num_sectors); + sb->super_offset = cpu_to_le64(rdev->sb_start); + sb->sb_csum = calc_sb_1_csum(sb); + do { + md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, + rdev->sb_page); + } while (md_super_wait(rdev->mddev) < 0); + return num_sectors; + +} + +static int +super_1_allow_new_offset(struct md_rdev *rdev, + unsigned long long new_offset) +{ + /* All necessary checks on new >= old have been done */ + struct bitmap *bitmap; + if (new_offset >= rdev->data_offset) + return 1; + + /* with 1.0 metadata, there is no metadata to tread on + * so we can always move back */ + if (rdev->mddev->minor_version == 0) + return 1; + + /* otherwise we must be sure not to step on + * any metadata, so stay: + * 36K beyond start of superblock + * beyond end of badblocks + * beyond write-intent bitmap + */ + if (rdev->sb_start + (32+4)*2 > new_offset) + return 0; + bitmap = rdev->mddev->bitmap; + if (bitmap && !rdev->mddev->bitmap_info.file && + rdev->sb_start + rdev->mddev->bitmap_info.offset + + bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset) + return 0; + if (rdev->badblocks.sector + rdev->badblocks.size > new_offset) + return 0; + + return 1; +} + +static struct super_type super_types[] = { + [0] = { + .name = "0.90.0", + .owner = THIS_MODULE, + .load_super = super_90_load, + .validate_super = super_90_validate, + .sync_super = super_90_sync, + .rdev_size_change = super_90_rdev_size_change, + .allow_new_offset = super_90_allow_new_offset, + }, + [1] = { + .name = "md-1", + .owner = THIS_MODULE, + .load_super = super_1_load, + .validate_super = super_1_validate, + .sync_super = super_1_sync, + .rdev_size_change = super_1_rdev_size_change, + .allow_new_offset = super_1_allow_new_offset, + }, +}; + +static void sync_super(struct mddev *mddev, struct md_rdev *rdev) +{ + if (mddev->sync_super) { + mddev->sync_super(mddev, rdev); + return; + } + + BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types)); + + super_types[mddev->major_version].sync_super(mddev, rdev); +} + +static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2) +{ + struct md_rdev *rdev, *rdev2; + + rcu_read_lock(); + rdev_for_each_rcu(rdev, mddev1) { + if (test_bit(Faulty, &rdev->flags) || + test_bit(Journal, &rdev->flags) || + rdev->raid_disk == -1) + continue; + rdev_for_each_rcu(rdev2, mddev2) { + if (test_bit(Faulty, &rdev2->flags) || + test_bit(Journal, &rdev2->flags) || + rdev2->raid_disk == -1) + continue; + if (rdev->bdev->bd_disk == rdev2->bdev->bd_disk) { + rcu_read_unlock(); + return 1; + } + } + } + rcu_read_unlock(); + return 0; +} + +static LIST_HEAD(pending_raid_disks); + +/* + * Try to register data integrity profile for an mddev + * + * This is called when an array is started and after a disk has been kicked + * from the array. It only succeeds if all working and active component devices + * are integrity capable with matching profiles. + */ +int md_integrity_register(struct mddev *mddev) +{ + struct md_rdev *rdev, *reference = NULL; + + if (list_empty(&mddev->disks)) + return 0; /* nothing to do */ + if (!mddev->gendisk || blk_get_integrity(mddev->gendisk)) + return 0; /* shouldn't register, or already is */ + rdev_for_each(rdev, mddev) { + /* skip spares and non-functional disks */ + if (test_bit(Faulty, &rdev->flags)) + continue; + if (rdev->raid_disk < 0) + continue; + if (!reference) { + /* Use the first rdev as the reference */ + reference = rdev; + continue; + } + /* does this rdev's profile match the reference profile? */ + if (blk_integrity_compare(reference->bdev->bd_disk, + rdev->bdev->bd_disk) < 0) + return -EINVAL; + } + if (!reference || !bdev_get_integrity(reference->bdev)) + return 0; + /* + * All component devices are integrity capable and have matching + * profiles, register the common profile for the md device. + */ + blk_integrity_register(mddev->gendisk, + bdev_get_integrity(reference->bdev)); + + pr_debug("md: data integrity enabled on %s\n", mdname(mddev)); + if (bioset_integrity_create(&mddev->bio_set, BIO_POOL_SIZE) || + (mddev->level != 1 && mddev->level != 10 && + bioset_integrity_create(&mddev->io_clone_set, BIO_POOL_SIZE))) { + /* + * No need to handle the failure of bioset_integrity_create, + * because the function is called by md_run() -> pers->run(), + * md_run calls bioset_exit -> bioset_integrity_free in case + * of failure case. + */ + pr_err("md: failed to create integrity pool for %s\n", + mdname(mddev)); + return -EINVAL; + } + return 0; +} +EXPORT_SYMBOL(md_integrity_register); + +/* + * Attempt to add an rdev, but only if it is consistent with the current + * integrity profile + */ +int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev) +{ + struct blk_integrity *bi_mddev; + + if (!mddev->gendisk) + return 0; + + bi_mddev = blk_get_integrity(mddev->gendisk); + + if (!bi_mddev) /* nothing to do */ + return 0; + + if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) { + pr_err("%s: incompatible integrity profile for %pg\n", + mdname(mddev), rdev->bdev); + return -ENXIO; + } + + return 0; +} +EXPORT_SYMBOL(md_integrity_add_rdev); + +static bool rdev_read_only(struct md_rdev *rdev) +{ + return bdev_read_only(rdev->bdev) || + (rdev->meta_bdev && bdev_read_only(rdev->meta_bdev)); +} + +static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev) +{ + char b[BDEVNAME_SIZE]; + int err; + + /* prevent duplicates */ + if (find_rdev(mddev, rdev->bdev->bd_dev)) + return -EEXIST; + + if (rdev_read_only(rdev) && mddev->pers) + return -EROFS; + + /* make sure rdev->sectors exceeds mddev->dev_sectors */ + if (!test_bit(Journal, &rdev->flags) && + rdev->sectors && + (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) { + if (mddev->pers) { + /* Cannot change size, so fail + * If mddev->level <= 0, then we don't care + * about aligning sizes (e.g. linear) + */ + if (mddev->level > 0) + return -ENOSPC; + } else + mddev->dev_sectors = rdev->sectors; + } + + /* Verify rdev->desc_nr is unique. + * If it is -1, assign a free number, else + * check number is not in use + */ + rcu_read_lock(); + if (rdev->desc_nr < 0) { + int choice = 0; + if (mddev->pers) + choice = mddev->raid_disks; + while (md_find_rdev_nr_rcu(mddev, choice)) + choice++; + rdev->desc_nr = choice; + } else { + if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) { + rcu_read_unlock(); + return -EBUSY; + } + } + rcu_read_unlock(); + if (!test_bit(Journal, &rdev->flags) && + mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { + pr_warn("md: %s: array is limited to %d devices\n", + mdname(mddev), mddev->max_disks); + return -EBUSY; + } + snprintf(b, sizeof(b), "%pg", rdev->bdev); + strreplace(b, '/', '!'); + + rdev->mddev = mddev; + pr_debug("md: bind<%s>\n", b); + + if (mddev->raid_disks) + mddev_create_serial_pool(mddev, rdev, false); + + if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) + goto fail; + + /* failure here is OK */ + err = sysfs_create_link(&rdev->kobj, bdev_kobj(rdev->bdev), "block"); + rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); + rdev->sysfs_unack_badblocks = + sysfs_get_dirent_safe(rdev->kobj.sd, "unacknowledged_bad_blocks"); + rdev->sysfs_badblocks = + sysfs_get_dirent_safe(rdev->kobj.sd, "bad_blocks"); + + list_add_rcu(&rdev->same_set, &mddev->disks); + bd_link_disk_holder(rdev->bdev, mddev->gendisk); + + /* May as well allow recovery to be retried once */ + mddev->recovery_disabled++; + + return 0; + + fail: + pr_warn("md: failed to register dev-%s for %s\n", + b, mdname(mddev)); + return err; +} + +void md_autodetect_dev(dev_t dev); + +/* just for claiming the bdev */ +static struct md_rdev claim_rdev; + +static void export_rdev(struct md_rdev *rdev, struct mddev *mddev) +{ + pr_debug("md: export_rdev(%pg)\n", rdev->bdev); + md_rdev_clear(rdev); +#ifndef MODULE + if (test_bit(AutoDetected, &rdev->flags)) + md_autodetect_dev(rdev->bdev->bd_dev); +#endif + blkdev_put(rdev->bdev, + test_bit(Holder, &rdev->flags) ? rdev : &claim_rdev); + rdev->bdev = NULL; + kobject_put(&rdev->kobj); +} + +static void md_kick_rdev_from_array(struct md_rdev *rdev) +{ + struct mddev *mddev = rdev->mddev; + + bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk); + list_del_rcu(&rdev->same_set); + pr_debug("md: unbind<%pg>\n", rdev->bdev); + mddev_destroy_serial_pool(rdev->mddev, rdev, false); + rdev->mddev = NULL; + sysfs_remove_link(&rdev->kobj, "block"); + sysfs_put(rdev->sysfs_state); + sysfs_put(rdev->sysfs_unack_badblocks); + sysfs_put(rdev->sysfs_badblocks); + rdev->sysfs_state = NULL; + rdev->sysfs_unack_badblocks = NULL; + rdev->sysfs_badblocks = NULL; + rdev->badblocks.count = 0; + + synchronize_rcu(); + + /* + * kobject_del() will wait for all in progress writers to be done, where + * reconfig_mutex is held, hence it can't be called under + * reconfig_mutex and it's delayed to mddev_unlock(). + */ + list_add(&rdev->same_set, &mddev->deleting); +} + +static void export_array(struct mddev *mddev) +{ + struct md_rdev *rdev; + + while (!list_empty(&mddev->disks)) { + rdev = list_first_entry(&mddev->disks, struct md_rdev, + same_set); + md_kick_rdev_from_array(rdev); + } + mddev->raid_disks = 0; + mddev->major_version = 0; +} + +static bool set_in_sync(struct mddev *mddev) +{ + lockdep_assert_held(&mddev->lock); + if (!mddev->in_sync) { + mddev->sync_checkers++; + spin_unlock(&mddev->lock); + percpu_ref_switch_to_atomic_sync(&mddev->writes_pending); + spin_lock(&mddev->lock); + if (!mddev->in_sync && + percpu_ref_is_zero(&mddev->writes_pending)) { + mddev->in_sync = 1; + /* + * Ensure ->in_sync is visible before we clear + * ->sync_checkers. + */ + smp_mb(); + set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); + sysfs_notify_dirent_safe(mddev->sysfs_state); + } + if (--mddev->sync_checkers == 0) + percpu_ref_switch_to_percpu(&mddev->writes_pending); + } + if (mddev->safemode == 1) + mddev->safemode = 0; + return mddev->in_sync; +} + +static void sync_sbs(struct mddev *mddev, int nospares) +{ + /* Update each superblock (in-memory image), but + * if we are allowed to, skip spares which already + * have the right event counter, or have one earlier + * (which would mean they aren't being marked as dirty + * with the rest of the array) + */ + struct md_rdev *rdev; + rdev_for_each(rdev, mddev) { + if (rdev->sb_events == mddev->events || + (nospares && + rdev->raid_disk < 0 && + rdev->sb_events+1 == mddev->events)) { + /* Don't update this superblock */ + rdev->sb_loaded = 2; + } else { + sync_super(mddev, rdev); + rdev->sb_loaded = 1; + } + } +} + +static bool does_sb_need_changing(struct mddev *mddev) +{ + struct md_rdev *rdev = NULL, *iter; + struct mdp_superblock_1 *sb; + int role; + + /* Find a good rdev */ + rdev_for_each(iter, mddev) + if ((iter->raid_disk >= 0) && !test_bit(Faulty, &iter->flags)) { + rdev = iter; + break; + } + + /* No good device found. */ + if (!rdev) + return false; + + sb = page_address(rdev->sb_page); + /* Check if a device has become faulty or a spare become active */ + rdev_for_each(rdev, mddev) { + role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); + /* Device activated? */ + if (role == MD_DISK_ROLE_SPARE && rdev->raid_disk >= 0 && + !test_bit(Faulty, &rdev->flags)) + return true; + /* Device turned faulty? */ + if (test_bit(Faulty, &rdev->flags) && (role < MD_DISK_ROLE_MAX)) + return true; + } + + /* Check if any mddev parameters have changed */ + if ((mddev->dev_sectors != le64_to_cpu(sb->size)) || + (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) || + (mddev->layout != le32_to_cpu(sb->layout)) || + (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) || + (mddev->chunk_sectors != le32_to_cpu(sb->chunksize))) + return true; + + return false; +} + +void md_update_sb(struct mddev *mddev, int force_change) +{ + struct md_rdev *rdev; + int sync_req; + int nospares = 0; + int any_badblocks_changed = 0; + int ret = -1; + + if (!md_is_rdwr(mddev)) { + if (force_change) + set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); + return; + } + +repeat: + if (mddev_is_clustered(mddev)) { + if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) + force_change = 1; + if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags)) + nospares = 1; + ret = md_cluster_ops->metadata_update_start(mddev); + /* Has someone else has updated the sb */ + if (!does_sb_need_changing(mddev)) { + if (ret == 0) + md_cluster_ops->metadata_update_cancel(mddev); + bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING), + BIT(MD_SB_CHANGE_DEVS) | + BIT(MD_SB_CHANGE_CLEAN)); + return; + } + } + + /* + * First make sure individual recovery_offsets are correct + * curr_resync_completed can only be used during recovery. + * During reshape/resync it might use array-addresses rather + * that device addresses. + */ + rdev_for_each(rdev, mddev) { + if (rdev->raid_disk >= 0 && + mddev->delta_disks >= 0 && + test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && + test_bit(MD_RECOVERY_RECOVER, &mddev->recovery) && + !test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && + !test_bit(Journal, &rdev->flags) && + !test_bit(In_sync, &rdev->flags) && + mddev->curr_resync_completed > rdev->recovery_offset) + rdev->recovery_offset = mddev->curr_resync_completed; + + } + if (!mddev->persistent) { + clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); + clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); + if (!mddev->external) { + clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); + rdev_for_each(rdev, mddev) { + if (rdev->badblocks.changed) { + rdev->badblocks.changed = 0; + ack_all_badblocks(&rdev->badblocks); + md_error(mddev, rdev); + } + clear_bit(Blocked, &rdev->flags); + clear_bit(BlockedBadBlocks, &rdev->flags); + wake_up(&rdev->blocked_wait); + } + } + wake_up(&mddev->sb_wait); + return; + } + + spin_lock(&mddev->lock); + + mddev->utime = ktime_get_real_seconds(); + + if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) + force_change = 1; + if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags)) + /* just a clean<-> dirty transition, possibly leave spares alone, + * though if events isn't the right even/odd, we will have to do + * spares after all + */ + nospares = 1; + if (force_change) + nospares = 0; + if (mddev->degraded) + /* If the array is degraded, then skipping spares is both + * dangerous and fairly pointless. + * Dangerous because a device that was removed from the array + * might have a event_count that still looks up-to-date, + * so it can be re-added without a resync. + * Pointless because if there are any spares to skip, + * then a recovery will happen and soon that array won't + * be degraded any more and the spare can go back to sleep then. + */ + nospares = 0; + + sync_req = mddev->in_sync; + + /* If this is just a dirty<->clean transition, and the array is clean + * and 'events' is odd, we can roll back to the previous clean state */ + if (nospares + && (mddev->in_sync && mddev->recovery_cp == MaxSector) + && mddev->can_decrease_events + && mddev->events != 1) { + mddev->events--; + mddev->can_decrease_events = 0; + } else { + /* otherwise we have to go forward and ... */ + mddev->events ++; + mddev->can_decrease_events = nospares; + } + + /* + * This 64-bit counter should never wrap. + * Either we are in around ~1 trillion A.C., assuming + * 1 reboot per second, or we have a bug... + */ + WARN_ON(mddev->events == 0); + + rdev_for_each(rdev, mddev) { + if (rdev->badblocks.changed) + any_badblocks_changed++; + if (test_bit(Faulty, &rdev->flags)) + set_bit(FaultRecorded, &rdev->flags); + } + + sync_sbs(mddev, nospares); + spin_unlock(&mddev->lock); + + pr_debug("md: updating %s RAID superblock on device (in sync %d)\n", + mdname(mddev), mddev->in_sync); + + if (mddev->queue) + blk_add_trace_msg(mddev->queue, "md md_update_sb"); +rewrite: + md_bitmap_update_sb(mddev->bitmap); + rdev_for_each(rdev, mddev) { + if (rdev->sb_loaded != 1) + continue; /* no noise on spare devices */ + + if (!test_bit(Faulty, &rdev->flags)) { + md_super_write(mddev,rdev, + rdev->sb_start, rdev->sb_size, + rdev->sb_page); + pr_debug("md: (write) %pg's sb offset: %llu\n", + rdev->bdev, + (unsigned long long)rdev->sb_start); + rdev->sb_events = mddev->events; + if (rdev->badblocks.size) { + md_super_write(mddev, rdev, + rdev->badblocks.sector, + rdev->badblocks.size << 9, + rdev->bb_page); + rdev->badblocks.size = 0; + } + + } else + pr_debug("md: %pg (skipping faulty)\n", + rdev->bdev); + + if (mddev->level == LEVEL_MULTIPATH) + /* only need to write one superblock... */ + break; + } + if (md_super_wait(mddev) < 0) + goto rewrite; + /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */ + + if (mddev_is_clustered(mddev) && ret == 0) + md_cluster_ops->metadata_update_finish(mddev); + + if (mddev->in_sync != sync_req || + !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING), + BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN))) + /* have to write it out again */ + goto repeat; + wake_up(&mddev->sb_wait); + if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) + sysfs_notify_dirent_safe(mddev->sysfs_completed); + + rdev_for_each(rdev, mddev) { + if (test_and_clear_bit(FaultRecorded, &rdev->flags)) + clear_bit(Blocked, &rdev->flags); + + if (any_badblocks_changed) + ack_all_badblocks(&rdev->badblocks); + clear_bit(BlockedBadBlocks, &rdev->flags); + wake_up(&rdev->blocked_wait); + } +} +EXPORT_SYMBOL(md_update_sb); + +static int add_bound_rdev(struct md_rdev *rdev) +{ + struct mddev *mddev = rdev->mddev; + int err = 0; + bool add_journal = test_bit(Journal, &rdev->flags); + + if (!mddev->pers->hot_remove_disk || add_journal) { + /* If there is hot_add_disk but no hot_remove_disk + * then added disks for geometry changes, + * and should be added immediately. + */ + super_types[mddev->major_version]. + validate_super(mddev, rdev); + if (add_journal) + mddev_suspend(mddev); + err = mddev->pers->hot_add_disk(mddev, rdev); + if (add_journal) + mddev_resume(mddev); + if (err) { + md_kick_rdev_from_array(rdev); + return err; + } + } + sysfs_notify_dirent_safe(rdev->sysfs_state); + + set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); + if (mddev->degraded) + set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + md_new_event(); + md_wakeup_thread(mddev->thread); + return 0; +} + +/* words written to sysfs files may, or may not, be \n terminated. + * We want to accept with case. For this we use cmd_match. + */ +static int cmd_match(const char *cmd, const char *str) +{ + /* See if cmd, written into a sysfs file, matches + * str. They must either be the same, or cmd can + * have a trailing newline + */ + while (*cmd && *str && *cmd == *str) { + cmd++; + str++; + } + if (*cmd == '\n') + cmd++; + if (*str || *cmd) + return 0; + return 1; +} + +struct rdev_sysfs_entry { + struct attribute attr; + ssize_t (*show)(struct md_rdev *, char *); + ssize_t (*store)(struct md_rdev *, const char *, size_t); +}; + +static ssize_t +state_show(struct md_rdev *rdev, char *page) +{ + char *sep = ","; + size_t len = 0; + unsigned long flags = READ_ONCE(rdev->flags); + + if (test_bit(Faulty, &flags) || + (!test_bit(ExternalBbl, &flags) && + rdev->badblocks.unacked_exist)) + len += sprintf(page+len, "faulty%s", sep); + if (test_bit(In_sync, &flags)) + len += sprintf(page+len, "in_sync%s", sep); + if (test_bit(Journal, &flags)) + len += sprintf(page+len, "journal%s", sep); + if (test_bit(WriteMostly, &flags)) + len += sprintf(page+len, "write_mostly%s", sep); + if (test_bit(Blocked, &flags) || + (rdev->badblocks.unacked_exist + && !test_bit(Faulty, &flags))) + len += sprintf(page+len, "blocked%s", sep); + if (!test_bit(Faulty, &flags) && + !test_bit(Journal, &flags) && + !test_bit(In_sync, &flags)) + len += sprintf(page+len, "spare%s", sep); + if (test_bit(WriteErrorSeen, &flags)) + len += sprintf(page+len, "write_error%s", sep); + if (test_bit(WantReplacement, &flags)) + len += sprintf(page+len, "want_replacement%s", sep); + if (test_bit(Replacement, &flags)) + len += sprintf(page+len, "replacement%s", sep); + if (test_bit(ExternalBbl, &flags)) + len += sprintf(page+len, "external_bbl%s", sep); + if (test_bit(FailFast, &flags)) + len += sprintf(page+len, "failfast%s", sep); + + if (len) + len -= strlen(sep); + + return len+sprintf(page+len, "\n"); +} + +static ssize_t +state_store(struct md_rdev *rdev, const char *buf, size_t len) +{ + /* can write + * faulty - simulates an error + * remove - disconnects the device + * writemostly - sets write_mostly + * -writemostly - clears write_mostly + * blocked - sets the Blocked flags + * -blocked - clears the Blocked and possibly simulates an error + * insync - sets Insync providing device isn't active + * -insync - clear Insync for a device with a slot assigned, + * so that it gets rebuilt based on bitmap + * write_error - sets WriteErrorSeen + * -write_error - clears WriteErrorSeen + * {,-}failfast - set/clear FailFast + */ + + struct mddev *mddev = rdev->mddev; + int err = -EINVAL; + bool need_update_sb = false; + + if (cmd_match(buf, "faulty") && rdev->mddev->pers) { + md_error(rdev->mddev, rdev); + + if (test_bit(MD_BROKEN, &rdev->mddev->flags)) + err = -EBUSY; + else + err = 0; + } else if (cmd_match(buf, "remove")) { + if (rdev->mddev->pers) { + clear_bit(Blocked, &rdev->flags); + remove_and_add_spares(rdev->mddev, rdev); + } + if (rdev->raid_disk >= 0) + err = -EBUSY; + else { + err = 0; + if (mddev_is_clustered(mddev)) + err = md_cluster_ops->remove_disk(mddev, rdev); + + if (err == 0) { + md_kick_rdev_from_array(rdev); + if (mddev->pers) { + set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); + md_wakeup_thread(mddev->thread); + } + md_new_event(); + } + } + } else if (cmd_match(buf, "writemostly")) { + set_bit(WriteMostly, &rdev->flags); + mddev_create_serial_pool(rdev->mddev, rdev, false); + need_update_sb = true; + err = 0; + } else if (cmd_match(buf, "-writemostly")) { + mddev_destroy_serial_pool(rdev->mddev, rdev, false); + clear_bit(WriteMostly, &rdev->flags); + need_update_sb = true; + err = 0; + } else if (cmd_match(buf, "blocked")) { + set_bit(Blocked, &rdev->flags); + err = 0; + } else if (cmd_match(buf, "-blocked")) { + if (!test_bit(Faulty, &rdev->flags) && + !test_bit(ExternalBbl, &rdev->flags) && + rdev->badblocks.unacked_exist) { + /* metadata handler doesn't understand badblocks, + * so we need to fail the device + */ + md_error(rdev->mddev, rdev); + } + clear_bit(Blocked, &rdev->flags); + clear_bit(BlockedBadBlocks, &rdev->flags); + wake_up(&rdev->blocked_wait); + set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); + md_wakeup_thread(rdev->mddev->thread); + + err = 0; + } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { + set_bit(In_sync, &rdev->flags); + err = 0; + } else if (cmd_match(buf, "failfast")) { + set_bit(FailFast, &rdev->flags); + need_update_sb = true; + err = 0; + } else if (cmd_match(buf, "-failfast")) { + clear_bit(FailFast, &rdev->flags); + need_update_sb = true; + err = 0; + } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 && + !test_bit(Journal, &rdev->flags)) { + if (rdev->mddev->pers == NULL) { + clear_bit(In_sync, &rdev->flags); + rdev->saved_raid_disk = rdev->raid_disk; + rdev->raid_disk = -1; + err = 0; + } + } else if (cmd_match(buf, "write_error")) { + set_bit(WriteErrorSeen, &rdev->flags); + err = 0; + } else if (cmd_match(buf, "-write_error")) { + clear_bit(WriteErrorSeen, &rdev->flags); + err = 0; + } else if (cmd_match(buf, "want_replacement")) { + /* Any non-spare device that is not a replacement can + * become want_replacement at any time, but we then need to + * check if recovery is needed. + */ + if (rdev->raid_disk >= 0 && + !test_bit(Journal, &rdev->flags) && + !test_bit(Replacement, &rdev->flags)) + set_bit(WantReplacement, &rdev->flags); + set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); + md_wakeup_thread(rdev->mddev->thread); + err = 0; + } else if (cmd_match(buf, "-want_replacement")) { + /* Clearing 'want_replacement' is always allowed. + * Once replacements starts it is too late though. + */ + err = 0; + clear_bit(WantReplacement, &rdev->flags); + } else if (cmd_match(buf, "replacement")) { + /* Can only set a device as a replacement when array has not + * yet been started. Once running, replacement is automatic + * from spares, or by assigning 'slot'. + */ + if (rdev->mddev->pers) + err = -EBUSY; + else { + set_bit(Replacement, &rdev->flags); + err = 0; + } + } else if (cmd_match(buf, "-replacement")) { + /* Similarly, can only clear Replacement before start */ + if (rdev->mddev->pers) + err = -EBUSY; + else { + clear_bit(Replacement, &rdev->flags); + err = 0; + } + } else if (cmd_match(buf, "re-add")) { + if (!rdev->mddev->pers) + err = -EINVAL; + else if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) && + rdev->saved_raid_disk >= 0) { + /* clear_bit is performed _after_ all the devices + * have their local Faulty bit cleared. If any writes + * happen in the meantime in the local node, they + * will land in the local bitmap, which will be synced + * by this node eventually + */ + if (!mddev_is_clustered(rdev->mddev) || + (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) { + clear_bit(Faulty, &rdev->flags); + err = add_bound_rdev(rdev); + } + } else + err = -EBUSY; + } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) { + set_bit(ExternalBbl, &rdev->flags); + rdev->badblocks.shift = 0; + err = 0; + } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) { + clear_bit(ExternalBbl, &rdev->flags); + err = 0; + } + if (need_update_sb) + md_update_sb(mddev, 1); + if (!err) + sysfs_notify_dirent_safe(rdev->sysfs_state); + return err ? err : len; +} +static struct rdev_sysfs_entry rdev_state = +__ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store); + +static ssize_t +errors_show(struct md_rdev *rdev, char *page) +{ + return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); +} + +static ssize_t +errors_store(struct md_rdev *rdev, const char *buf, size_t len) +{ + unsigned int n; + int rv; + + rv = kstrtouint(buf, 10, &n); + if (rv < 0) + return rv; + atomic_set(&rdev->corrected_errors, n); + return len; +} +static struct rdev_sysfs_entry rdev_errors = +__ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); + +static ssize_t +slot_show(struct md_rdev *rdev, char *page) +{ + if (test_bit(Journal, &rdev->flags)) + return sprintf(page, "journal\n"); + else if (rdev->raid_disk < 0) + return sprintf(page, "none\n"); + else + return sprintf(page, "%d\n", rdev->raid_disk); +} + +static ssize_t +slot_store(struct md_rdev *rdev, const char *buf, size_t len) +{ + int slot; + int err; + + if (test_bit(Journal, &rdev->flags)) + return -EBUSY; + if (strncmp(buf, "none", 4)==0) + slot = -1; + else { + err = kstrtouint(buf, 10, (unsigned int *)&slot); + if (err < 0) + return err; + if (slot < 0) + /* overflow */ + return -ENOSPC; + } + if (rdev->mddev->pers && slot == -1) { + /* Setting 'slot' on an active array requires also + * updating the 'rd%d' link, and communicating + * with the personality with ->hot_*_disk. + * For now we only support removing + * failed/spare devices. This normally happens automatically, + * but not when the metadata is externally managed. + */ + if (rdev->raid_disk == -1) + return -EEXIST; + /* personality does all needed checks */ + if (rdev->mddev->pers->hot_remove_disk == NULL) + return -EINVAL; + clear_bit(Blocked, &rdev->flags); + remove_and_add_spares(rdev->mddev, rdev); + if (rdev->raid_disk >= 0) + return -EBUSY; + set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); + md_wakeup_thread(rdev->mddev->thread); + } else if (rdev->mddev->pers) { + /* Activating a spare .. or possibly reactivating + * if we ever get bitmaps working here. + */ + int err; + + if (rdev->raid_disk != -1) + return -EBUSY; + + if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery)) + return -EBUSY; + + if (rdev->mddev->pers->hot_add_disk == NULL) + return -EINVAL; + + if (slot >= rdev->mddev->raid_disks && + slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) + return -ENOSPC; + + rdev->raid_disk = slot; + if (test_bit(In_sync, &rdev->flags)) + rdev->saved_raid_disk = slot; + else + rdev->saved_raid_disk = -1; + clear_bit(In_sync, &rdev->flags); + clear_bit(Bitmap_sync, &rdev->flags); + err = rdev->mddev->pers->hot_add_disk(rdev->mddev, rdev); + if (err) { + rdev->raid_disk = -1; + return err; + } else + sysfs_notify_dirent_safe(rdev->sysfs_state); + /* failure here is OK */; + sysfs_link_rdev(rdev->mddev, rdev); + /* don't wakeup anyone, leave that to userspace. */ + } else { + if (slot >= rdev->mddev->raid_disks && + slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) + return -ENOSPC; + rdev->raid_disk = slot; + /* assume it is working */ + clear_bit(Faulty, &rdev->flags); + clear_bit(WriteMostly, &rdev->flags); + set_bit(In_sync, &rdev->flags); + sysfs_notify_dirent_safe(rdev->sysfs_state); + } + return len; +} + +static struct rdev_sysfs_entry rdev_slot = +__ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); + +static ssize_t +offset_show(struct md_rdev *rdev, char *page) +{ + return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); +} + +static ssize_t +offset_store(struct md_rdev *rdev, const char *buf, size_t len) +{ + unsigned long long offset; + if (kstrtoull(buf, 10, &offset) < 0) + return -EINVAL; + if (rdev->mddev->pers && rdev->raid_disk >= 0) + return -EBUSY; + if (rdev->sectors && rdev->mddev->external) + /* Must set offset before size, so overlap checks + * can be sane */ + return -EBUSY; + rdev->data_offset = offset; + rdev->new_data_offset = offset; + return len; +} + +static struct rdev_sysfs_entry rdev_offset = +__ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); + +static ssize_t new_offset_show(struct md_rdev *rdev, char *page) +{ + return sprintf(page, "%llu\n", + (unsigned long long)rdev->new_data_offset); +} + +static ssize_t new_offset_store(struct md_rdev *rdev, + const char *buf, size_t len) +{ + unsigned long long new_offset; + struct mddev *mddev = rdev->mddev; + + if (kstrtoull(buf, 10, &new_offset) < 0) + return -EINVAL; + + if (mddev->sync_thread || + test_bit(MD_RECOVERY_RUNNING,&mddev->recovery)) + return -EBUSY; + if (new_offset == rdev->data_offset) + /* reset is always permitted */ + ; + else if (new_offset > rdev->data_offset) { + /* must not push array size beyond rdev_sectors */ + if (new_offset - rdev->data_offset + + mddev->dev_sectors > rdev->sectors) + return -E2BIG; + } + /* Metadata worries about other space details. */ + + /* decreasing the offset is inconsistent with a backwards + * reshape. + */ + if (new_offset < rdev->data_offset && + mddev->reshape_backwards) + return -EINVAL; + /* Increasing offset is inconsistent with forwards + * reshape. reshape_direction should be set to + * 'backwards' first. + */ + if (new_offset > rdev->data_offset && + !mddev->reshape_backwards) + return -EINVAL; + + if (mddev->pers && mddev->persistent && + !super_types[mddev->major_version] + .allow_new_offset(rdev, new_offset)) + return -E2BIG; + rdev->new_data_offset = new_offset; + if (new_offset > rdev->data_offset) + mddev->reshape_backwards = 1; + else if (new_offset < rdev->data_offset) + mddev->reshape_backwards = 0; + + return len; +} +static struct rdev_sysfs_entry rdev_new_offset = +__ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store); + +static ssize_t +rdev_size_show(struct md_rdev *rdev, char *page) +{ + return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); +} + +static int md_rdevs_overlap(struct md_rdev *a, struct md_rdev *b) +{ + /* check if two start/length pairs overlap */ + if (a->data_offset + a->sectors <= b->data_offset) + return false; + if (b->data_offset + b->sectors <= a->data_offset) + return false; + return true; +} + +static bool md_rdev_overlaps(struct md_rdev *rdev) +{ + struct mddev *mddev; + struct md_rdev *rdev2; + + spin_lock(&all_mddevs_lock); + list_for_each_entry(mddev, &all_mddevs, all_mddevs) { + if (test_bit(MD_DELETED, &mddev->flags)) + continue; + rdev_for_each(rdev2, mddev) { + if (rdev != rdev2 && rdev->bdev == rdev2->bdev && + md_rdevs_overlap(rdev, rdev2)) { + spin_unlock(&all_mddevs_lock); + return true; + } + } + } + spin_unlock(&all_mddevs_lock); + return false; +} + +static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) +{ + unsigned long long blocks; + sector_t new; + + if (kstrtoull(buf, 10, &blocks) < 0) + return -EINVAL; + + if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) + return -EINVAL; /* sector conversion overflow */ + + new = blocks * 2; + if (new != blocks * 2) + return -EINVAL; /* unsigned long long to sector_t overflow */ + + *sectors = new; + return 0; +} + +static ssize_t +rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len) +{ + struct mddev *my_mddev = rdev->mddev; + sector_t oldsectors = rdev->sectors; + sector_t sectors; + + if (test_bit(Journal, &rdev->flags)) + return -EBUSY; + if (strict_blocks_to_sectors(buf, §ors) < 0) + return -EINVAL; + if (rdev->data_offset != rdev->new_data_offset) + return -EINVAL; /* too confusing */ + if (my_mddev->pers && rdev->raid_disk >= 0) { + if (my_mddev->persistent) { + sectors = super_types[my_mddev->major_version]. + rdev_size_change(rdev, sectors); + if (!sectors) + return -EBUSY; + } else if (!sectors) + sectors = bdev_nr_sectors(rdev->bdev) - + rdev->data_offset; + if (!my_mddev->pers->resize) + /* Cannot change size for RAID0 or Linear etc */ + return -EINVAL; + } + if (sectors < my_mddev->dev_sectors) + return -EINVAL; /* component must fit device */ + + rdev->sectors = sectors; + + /* + * Check that all other rdevs with the same bdev do not overlap. This + * check does not provide a hard guarantee, it just helps avoid + * dangerous mistakes. + */ + if (sectors > oldsectors && my_mddev->external && + md_rdev_overlaps(rdev)) { + /* + * Someone else could have slipped in a size change here, but + * doing so is just silly. We put oldsectors back because we + * know it is safe, and trust userspace not to race with itself. + */ + rdev->sectors = oldsectors; + return -EBUSY; + } + return len; +} + +static struct rdev_sysfs_entry rdev_size = +__ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); + +static ssize_t recovery_start_show(struct md_rdev *rdev, char *page) +{ + unsigned long long recovery_start = rdev->recovery_offset; + + if (test_bit(In_sync, &rdev->flags) || + recovery_start == MaxSector) + return sprintf(page, "none\n"); + + return sprintf(page, "%llu\n", recovery_start); +} + +static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len) +{ + unsigned long long recovery_start; + + if (cmd_match(buf, "none")) + recovery_start = MaxSector; + else if (kstrtoull(buf, 10, &recovery_start)) + return -EINVAL; + + if (rdev->mddev->pers && + rdev->raid_disk >= 0) + return -EBUSY; + + rdev->recovery_offset = recovery_start; + if (recovery_start == MaxSector) + set_bit(In_sync, &rdev->flags); + else + clear_bit(In_sync, &rdev->flags); + return len; +} + +static struct rdev_sysfs_entry rdev_recovery_start = +__ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); + +/* sysfs access to bad-blocks list. + * We present two files. + * 'bad-blocks' lists sector numbers and lengths of ranges that + * are recorded as bad. The list is truncated to fit within + * the one-page limit of sysfs. + * Writing "sector length" to this file adds an acknowledged + * bad block list. + * 'unacknowledged-bad-blocks' lists bad blocks that have not yet + * been acknowledged. Writing to this file adds bad blocks + * without acknowledging them. This is largely for testing. + */ +static ssize_t bb_show(struct md_rdev *rdev, char *page) +{ + return badblocks_show(&rdev->badblocks, page, 0); +} +static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len) +{ + int rv = badblocks_store(&rdev->badblocks, page, len, 0); + /* Maybe that ack was all we needed */ + if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags)) + wake_up(&rdev->blocked_wait); + return rv; +} +static struct rdev_sysfs_entry rdev_bad_blocks = +__ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store); + +static ssize_t ubb_show(struct md_rdev *rdev, char *page) +{ + return badblocks_show(&rdev->badblocks, page, 1); +} +static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len) +{ + return badblocks_store(&rdev->badblocks, page, len, 1); +} +static struct rdev_sysfs_entry rdev_unack_bad_blocks = +__ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store); + +static ssize_t +ppl_sector_show(struct md_rdev *rdev, char *page) +{ + return sprintf(page, "%llu\n", (unsigned long long)rdev->ppl.sector); +} + +static ssize_t +ppl_sector_store(struct md_rdev *rdev, const char *buf, size_t len) +{ + unsigned long long sector; + + if (kstrtoull(buf, 10, §or) < 0) + return -EINVAL; + if (sector != (sector_t)sector) + return -EINVAL; + + if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) && + rdev->raid_disk >= 0) + return -EBUSY; + + if (rdev->mddev->persistent) { + if (rdev->mddev->major_version == 0) + return -EINVAL; + if ((sector > rdev->sb_start && + sector - rdev->sb_start > S16_MAX) || + (sector < rdev->sb_start && + rdev->sb_start - sector > -S16_MIN)) + return -EINVAL; + rdev->ppl.offset = sector - rdev->sb_start; + } else if (!rdev->mddev->external) { + return -EBUSY; + } + rdev->ppl.sector = sector; + return len; +} + +static struct rdev_sysfs_entry rdev_ppl_sector = +__ATTR(ppl_sector, S_IRUGO|S_IWUSR, ppl_sector_show, ppl_sector_store); + +static ssize_t +ppl_size_show(struct md_rdev *rdev, char *page) +{ + return sprintf(page, "%u\n", rdev->ppl.size); +} + +static ssize_t +ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len) +{ + unsigned int size; + + if (kstrtouint(buf, 10, &size) < 0) + return -EINVAL; + + if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) && + rdev->raid_disk >= 0) + return -EBUSY; + + if (rdev->mddev->persistent) { + if (rdev->mddev->major_version == 0) + return -EINVAL; + if (size > U16_MAX) + return -EINVAL; + } else if (!rdev->mddev->external) { + return -EBUSY; + } + rdev->ppl.size = size; + return len; +} + +static struct rdev_sysfs_entry rdev_ppl_size = +__ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store); + +static struct attribute *rdev_default_attrs[] = { + &rdev_state.attr, + &rdev_errors.attr, + &rdev_slot.attr, + &rdev_offset.attr, + &rdev_new_offset.attr, + &rdev_size.attr, + &rdev_recovery_start.attr, + &rdev_bad_blocks.attr, + &rdev_unack_bad_blocks.attr, + &rdev_ppl_sector.attr, + &rdev_ppl_size.attr, + NULL, +}; +ATTRIBUTE_GROUPS(rdev_default); +static ssize_t +rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) +{ + struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); + struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); + + if (!entry->show) + return -EIO; + if (!rdev->mddev) + return -ENODEV; + return entry->show(rdev, page); +} + +static ssize_t +rdev_attr_store(struct kobject *kobj, struct attribute *attr, + const char *page, size_t length) +{ + struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); + struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); + struct kernfs_node *kn = NULL; + ssize_t rv; + struct mddev *mddev = rdev->mddev; + + if (!entry->store) + return -EIO; + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + if (entry->store == state_store && cmd_match(page, "remove")) + kn = sysfs_break_active_protection(kobj, attr); + + rv = mddev ? mddev_lock(mddev) : -ENODEV; + if (!rv) { + if (rdev->mddev == NULL) + rv = -ENODEV; + else + rv = entry->store(rdev, page, length); + mddev_unlock(mddev); + } + + if (kn) + sysfs_unbreak_active_protection(kn); + + return rv; +} + +static void rdev_free(struct kobject *ko) +{ + struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj); + kfree(rdev); +} +static const struct sysfs_ops rdev_sysfs_ops = { + .show = rdev_attr_show, + .store = rdev_attr_store, +}; +static const struct kobj_type rdev_ktype = { + .release = rdev_free, + .sysfs_ops = &rdev_sysfs_ops, + .default_groups = rdev_default_groups, +}; + +int md_rdev_init(struct md_rdev *rdev) +{ + rdev->desc_nr = -1; + rdev->saved_raid_disk = -1; + rdev->raid_disk = -1; + rdev->flags = 0; + rdev->data_offset = 0; + rdev->new_data_offset = 0; + rdev->sb_events = 0; + rdev->last_read_error = 0; + rdev->sb_loaded = 0; + rdev->bb_page = NULL; + atomic_set(&rdev->nr_pending, 0); + atomic_set(&rdev->read_errors, 0); + atomic_set(&rdev->corrected_errors, 0); + + INIT_LIST_HEAD(&rdev->same_set); + init_waitqueue_head(&rdev->blocked_wait); + + /* Add space to store bad block list. + * This reserves the space even on arrays where it cannot + * be used - I wonder if that matters + */ + return badblocks_init(&rdev->badblocks, 0); +} +EXPORT_SYMBOL_GPL(md_rdev_init); + +/* + * Import a device. If 'super_format' >= 0, then sanity check the superblock + * + * mark the device faulty if: + * + * - the device is nonexistent (zero size) + * - the device has no valid superblock + * + * a faulty rdev _never_ has rdev->sb set. + */ +static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor) +{ + struct md_rdev *rdev; + struct md_rdev *holder; + sector_t size; + int err; + + rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); + if (!rdev) + return ERR_PTR(-ENOMEM); + + err = md_rdev_init(rdev); + if (err) + goto out_free_rdev; + err = alloc_disk_sb(rdev); + if (err) + goto out_clear_rdev; + + if (super_format == -2) { + holder = &claim_rdev; + } else { + holder = rdev; + set_bit(Holder, &rdev->flags); + } + + rdev->bdev = blkdev_get_by_dev(newdev, BLK_OPEN_READ | BLK_OPEN_WRITE, + holder, NULL); + if (IS_ERR(rdev->bdev)) { + pr_warn("md: could not open device unknown-block(%u,%u).\n", + MAJOR(newdev), MINOR(newdev)); + err = PTR_ERR(rdev->bdev); + goto out_clear_rdev; + } + + kobject_init(&rdev->kobj, &rdev_ktype); + + size = bdev_nr_bytes(rdev->bdev) >> BLOCK_SIZE_BITS; + if (!size) { + pr_warn("md: %pg has zero or unknown size, marking faulty!\n", + rdev->bdev); + err = -EINVAL; + goto out_blkdev_put; + } + + if (super_format >= 0) { + err = super_types[super_format]. + load_super(rdev, NULL, super_minor); + if (err == -EINVAL) { + pr_warn("md: %pg does not have a valid v%d.%d superblock, not importing!\n", + rdev->bdev, + super_format, super_minor); + goto out_blkdev_put; + } + if (err < 0) { + pr_warn("md: could not read %pg's sb, not importing!\n", + rdev->bdev); + goto out_blkdev_put; + } + } + + return rdev; + +out_blkdev_put: + blkdev_put(rdev->bdev, holder); +out_clear_rdev: + md_rdev_clear(rdev); +out_free_rdev: + kfree(rdev); + return ERR_PTR(err); +} + +/* + * Check a full RAID array for plausibility + */ + +static int analyze_sbs(struct mddev *mddev) +{ + int i; + struct md_rdev *rdev, *freshest, *tmp; + + freshest = NULL; + rdev_for_each_safe(rdev, tmp, mddev) + switch (super_types[mddev->major_version]. + load_super(rdev, freshest, mddev->minor_version)) { + case 1: + freshest = rdev; + break; + case 0: + break; + default: + pr_warn("md: fatal superblock inconsistency in %pg -- removing from array\n", + rdev->bdev); + md_kick_rdev_from_array(rdev); + } + + /* Cannot find a valid fresh disk */ + if (!freshest) { + pr_warn("md: cannot find a valid disk\n"); + return -EINVAL; + } + + super_types[mddev->major_version]. + validate_super(mddev, freshest); + + i = 0; + rdev_for_each_safe(rdev, tmp, mddev) { + if (mddev->max_disks && + (rdev->desc_nr >= mddev->max_disks || + i > mddev->max_disks)) { + pr_warn("md: %s: %pg: only %d devices permitted\n", + mdname(mddev), rdev->bdev, + mddev->max_disks); + md_kick_rdev_from_array(rdev); + continue; + } + if (rdev != freshest) { + if (super_types[mddev->major_version]. + validate_super(mddev, rdev)) { + pr_warn("md: kicking non-fresh %pg from array!\n", + rdev->bdev); + md_kick_rdev_from_array(rdev); + continue; + } + } + if (mddev->level == LEVEL_MULTIPATH) { + rdev->desc_nr = i++; + rdev->raid_disk = rdev->desc_nr; + set_bit(In_sync, &rdev->flags); + } else if (rdev->raid_disk >= + (mddev->raid_disks - min(0, mddev->delta_disks)) && + !test_bit(Journal, &rdev->flags)) { + rdev->raid_disk = -1; + clear_bit(In_sync, &rdev->flags); + } + } + + return 0; +} + +/* Read a fixed-point number. + * Numbers in sysfs attributes should be in "standard" units where + * possible, so time should be in seconds. + * However we internally use a a much smaller unit such as + * milliseconds or jiffies. + * This function takes a decimal number with a possible fractional + * component, and produces an integer which is the result of + * multiplying that number by 10^'scale'. + * all without any floating-point arithmetic. + */ +int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) +{ + unsigned long result = 0; + long decimals = -1; + while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { + if (*cp == '.') + decimals = 0; + else if (decimals < scale) { + unsigned int value; + value = *cp - '0'; + result = result * 10 + value; + if (decimals >= 0) + decimals++; + } + cp++; + } + if (*cp == '\n') + cp++; + if (*cp) + return -EINVAL; + if (decimals < 0) + decimals = 0; + *res = result * int_pow(10, scale - decimals); + return 0; +} + +static ssize_t +safe_delay_show(struct mddev *mddev, char *page) +{ + unsigned int msec = ((unsigned long)mddev->safemode_delay*1000)/HZ; + + return sprintf(page, "%u.%03u\n", msec/1000, msec%1000); +} +static ssize_t +safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len) +{ + unsigned long msec; + + if (mddev_is_clustered(mddev)) { + pr_warn("md: Safemode is disabled for clustered mode\n"); + return -EINVAL; + } + + if (strict_strtoul_scaled(cbuf, &msec, 3) < 0 || msec > UINT_MAX / HZ) + return -EINVAL; + if (msec == 0) + mddev->safemode_delay = 0; + else { + unsigned long old_delay = mddev->safemode_delay; + unsigned long new_delay = (msec*HZ)/1000; + + if (new_delay == 0) + new_delay = 1; + mddev->safemode_delay = new_delay; + if (new_delay < old_delay || old_delay == 0) + mod_timer(&mddev->safemode_timer, jiffies+1); + } + return len; +} +static struct md_sysfs_entry md_safe_delay = +__ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); + +static ssize_t +level_show(struct mddev *mddev, char *page) +{ + struct md_personality *p; + int ret; + spin_lock(&mddev->lock); + p = mddev->pers; + if (p) + ret = sprintf(page, "%s\n", p->name); + else if (mddev->clevel[0]) + ret = sprintf(page, "%s\n", mddev->clevel); + else if (mddev->level != LEVEL_NONE) + ret = sprintf(page, "%d\n", mddev->level); + else + ret = 0; + spin_unlock(&mddev->lock); + return ret; +} + +static ssize_t +level_store(struct mddev *mddev, const char *buf, size_t len) +{ + char clevel[16]; + ssize_t rv; + size_t slen = len; + struct md_personality *pers, *oldpers; + long level; + void *priv, *oldpriv; + struct md_rdev *rdev; + + if (slen == 0 || slen >= sizeof(clevel)) + return -EINVAL; + + rv = mddev_lock(mddev); + if (rv) + return rv; + + if (mddev->pers == NULL) { + strncpy(mddev->clevel, buf, slen); + if (mddev->clevel[slen-1] == '\n') + slen--; + mddev->clevel[slen] = 0; + mddev->level = LEVEL_NONE; + rv = len; + goto out_unlock; + } + rv = -EROFS; + if (!md_is_rdwr(mddev)) + goto out_unlock; + + /* request to change the personality. Need to ensure: + * - array is not engaged in resync/recovery/reshape + * - old personality can be suspended + * - new personality will access other array. + */ + + rv = -EBUSY; + if (mddev->sync_thread || + test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || + mddev->reshape_position != MaxSector || + mddev->sysfs_active) + goto out_unlock; + + rv = -EINVAL; + if (!mddev->pers->quiesce) { + pr_warn("md: %s: %s does not support online personality change\n", + mdname(mddev), mddev->pers->name); + goto out_unlock; + } + + /* Now find the new personality */ + strncpy(clevel, buf, slen); + if (clevel[slen-1] == '\n') + slen--; + clevel[slen] = 0; + if (kstrtol(clevel, 10, &level)) + level = LEVEL_NONE; + + if (request_module("md-%s", clevel) != 0) + request_module("md-level-%s", clevel); + spin_lock(&pers_lock); + pers = find_pers(level, clevel); + if (!pers || !try_module_get(pers->owner)) { + spin_unlock(&pers_lock); + pr_warn("md: personality %s not loaded\n", clevel); + rv = -EINVAL; + goto out_unlock; + } + spin_unlock(&pers_lock); + + if (pers == mddev->pers) { + /* Nothing to do! */ + module_put(pers->owner); + rv = len; + goto out_unlock; + } + if (!pers->takeover) { + module_put(pers->owner); + pr_warn("md: %s: %s does not support personality takeover\n", + mdname(mddev), clevel); + rv = -EINVAL; + goto out_unlock; + } + + rdev_for_each(rdev, mddev) + rdev->new_raid_disk = rdev->raid_disk; + + /* ->takeover must set new_* and/or delta_disks + * if it succeeds, and may set them when it fails. + */ + priv = pers->takeover(mddev); + if (IS_ERR(priv)) { + mddev->new_level = mddev->level; + mddev->new_layout = mddev->layout; + mddev->new_chunk_sectors = mddev->chunk_sectors; + mddev->raid_disks -= mddev->delta_disks; + mddev->delta_disks = 0; + mddev->reshape_backwards = 0; + module_put(pers->owner); + pr_warn("md: %s: %s would not accept array\n", + mdname(mddev), clevel); + rv = PTR_ERR(priv); + goto out_unlock; + } + + /* Looks like we have a winner */ + mddev_suspend(mddev); + mddev_detach(mddev); + + spin_lock(&mddev->lock); + oldpers = mddev->pers; + oldpriv = mddev->private; + mddev->pers = pers; + mddev->private = priv; + strscpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); + mddev->level = mddev->new_level; + mddev->layout = mddev->new_layout; + mddev->chunk_sectors = mddev->new_chunk_sectors; + mddev->delta_disks = 0; + mddev->reshape_backwards = 0; + mddev->degraded = 0; + spin_unlock(&mddev->lock); + + if (oldpers->sync_request == NULL && + mddev->external) { + /* We are converting from a no-redundancy array + * to a redundancy array and metadata is managed + * externally so we need to be sure that writes + * won't block due to a need to transition + * clean->dirty + * until external management is started. + */ + mddev->in_sync = 0; + mddev->safemode_delay = 0; + mddev->safemode = 0; + } + + oldpers->free(mddev, oldpriv); + + if (oldpers->sync_request == NULL && + pers->sync_request != NULL) { + /* need to add the md_redundancy_group */ + if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) + pr_warn("md: cannot register extra attributes for %s\n", + mdname(mddev)); + mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); + mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed"); + mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded"); + } + if (oldpers->sync_request != NULL && + pers->sync_request == NULL) { + /* need to remove the md_redundancy_group */ + if (mddev->to_remove == NULL) + mddev->to_remove = &md_redundancy_group; + } + + module_put(oldpers->owner); + + rdev_for_each(rdev, mddev) { + if (rdev->raid_disk < 0) + continue; + if (rdev->new_raid_disk >= mddev->raid_disks) + rdev->new_raid_disk = -1; + if (rdev->new_raid_disk == rdev->raid_disk) + continue; + sysfs_unlink_rdev(mddev, rdev); + } + rdev_for_each(rdev, mddev) { + if (rdev->raid_disk < 0) + continue; + if (rdev->new_raid_disk == rdev->raid_disk) + continue; + rdev->raid_disk = rdev->new_raid_disk; + if (rdev->raid_disk < 0) + clear_bit(In_sync, &rdev->flags); + else { + if (sysfs_link_rdev(mddev, rdev)) + pr_warn("md: cannot register rd%d for %s after level change\n", + rdev->raid_disk, mdname(mddev)); + } + } + + if (pers->sync_request == NULL) { + /* this is now an array without redundancy, so + * it must always be in_sync + */ + mddev->in_sync = 1; + del_timer_sync(&mddev->safemode_timer); + } + blk_set_stacking_limits(&mddev->queue->limits); + pers->run(mddev); + set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); + mddev_resume(mddev); + if (!mddev->thread) + md_update_sb(mddev, 1); + sysfs_notify_dirent_safe(mddev->sysfs_level); + md_new_event(); + rv = len; +out_unlock: + mddev_unlock(mddev); + return rv; +} + +static struct md_sysfs_entry md_level = +__ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); + +static ssize_t +layout_show(struct mddev *mddev, char *page) +{ + /* just a number, not meaningful for all levels */ + if (mddev->reshape_position != MaxSector && + mddev->layout != mddev->new_layout) + return sprintf(page, "%d (%d)\n", + mddev->new_layout, mddev->layout); + return sprintf(page, "%d\n", mddev->layout); +} + +static ssize_t +layout_store(struct mddev *mddev, const char *buf, size_t len) +{ + unsigned int n; + int err; + + err = kstrtouint(buf, 10, &n); + if (err < 0) + return err; + err = mddev_lock(mddev); + if (err) + return err; + + if (mddev->pers) { + if (mddev->pers->check_reshape == NULL) + err = -EBUSY; + else if (!md_is_rdwr(mddev)) + err = -EROFS; + else { + mddev->new_layout = n; + err = mddev->pers->check_reshape(mddev); + if (err) + mddev->new_layout = mddev->layout; + } + } else { + mddev->new_layout = n; + if (mddev->reshape_position == MaxSector) + mddev->layout = n; + } + mddev_unlock(mddev); + return err ?: len; +} +static struct md_sysfs_entry md_layout = +__ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); + +static ssize_t +raid_disks_show(struct mddev *mddev, char *page) +{ + if (mddev->raid_disks == 0) + return 0; + if (mddev->reshape_position != MaxSector && + mddev->delta_disks != 0) + return sprintf(page, "%d (%d)\n", mddev->raid_disks, + mddev->raid_disks - mddev->delta_disks); + return sprintf(page, "%d\n", mddev->raid_disks); +} + +static int update_raid_disks(struct mddev *mddev, int raid_disks); + +static ssize_t +raid_disks_store(struct mddev *mddev, const char *buf, size_t len) +{ + unsigned int n; + int err; + + err = kstrtouint(buf, 10, &n); + if (err < 0) + return err; + + err = mddev_lock(mddev); + if (err) + return err; + if (mddev->pers) + err = update_raid_disks(mddev, n); + else if (mddev->reshape_position != MaxSector) { + struct md_rdev *rdev; + int olddisks = mddev->raid_disks - mddev->delta_disks; + + err = -EINVAL; + rdev_for_each(rdev, mddev) { + if (olddisks < n && + rdev->data_offset < rdev->new_data_offset) + goto out_unlock; + if (olddisks > n && + rdev->data_offset > rdev->new_data_offset) + goto out_unlock; + } + err = 0; + mddev->delta_disks = n - olddisks; + mddev->raid_disks = n; + mddev->reshape_backwards = (mddev->delta_disks < 0); + } else + mddev->raid_disks = n; +out_unlock: + mddev_unlock(mddev); + return err ? err : len; +} +static struct md_sysfs_entry md_raid_disks = +__ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); + +static ssize_t +uuid_show(struct mddev *mddev, char *page) +{ + return sprintf(page, "%pU\n", mddev->uuid); +} +static struct md_sysfs_entry md_uuid = +__ATTR(uuid, S_IRUGO, uuid_show, NULL); + +static ssize_t +chunk_size_show(struct mddev *mddev, char *page) +{ + if (mddev->reshape_position != MaxSector && + mddev->chunk_sectors != mddev->new_chunk_sectors) + return sprintf(page, "%d (%d)\n", + mddev->new_chunk_sectors << 9, + mddev->chunk_sectors << 9); + return sprintf(page, "%d\n", mddev->chunk_sectors << 9); +} + +static ssize_t +chunk_size_store(struct mddev *mddev, const char *buf, size_t len) +{ + unsigned long n; + int err; + + err = kstrtoul(buf, 10, &n); + if (err < 0) + return err; + + err = mddev_lock(mddev); + if (err) + return err; + if (mddev->pers) { + if (mddev->pers->check_reshape == NULL) + err = -EBUSY; + else if (!md_is_rdwr(mddev)) + err = -EROFS; + else { + mddev->new_chunk_sectors = n >> 9; + err = mddev->pers->check_reshape(mddev); + if (err) + mddev->new_chunk_sectors = mddev->chunk_sectors; + } + } else { + mddev->new_chunk_sectors = n >> 9; + if (mddev->reshape_position == MaxSector) + mddev->chunk_sectors = n >> 9; + } + mddev_unlock(mddev); + return err ?: len; +} +static struct md_sysfs_entry md_chunk_size = +__ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); + +static ssize_t +resync_start_show(struct mddev *mddev, char *page) +{ + if (mddev->recovery_cp == MaxSector) + return sprintf(page, "none\n"); + return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); +} + +static ssize_t +resync_start_store(struct mddev *mddev, const char *buf, size_t len) +{ + unsigned long long n; + int err; + + if (cmd_match(buf, "none")) + n = MaxSector; + else { + err = kstrtoull(buf, 10, &n); + if (err < 0) + return err; + if (n != (sector_t)n) + return -EINVAL; + } + + err = mddev_lock(mddev); + if (err) + return err; + if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) + err = -EBUSY; + + if (!err) { + mddev->recovery_cp = n; + if (mddev->pers) + set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); + } + mddev_unlock(mddev); + return err ?: len; +} +static struct md_sysfs_entry md_resync_start = +__ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR, + resync_start_show, resync_start_store); + +/* + * The array state can be: + * + * clear + * No devices, no size, no level + * Equivalent to STOP_ARRAY ioctl + * inactive + * May have some settings, but array is not active + * all IO results in error + * When written, doesn't tear down array, but just stops it + * suspended (not supported yet) + * All IO requests will block. The array can be reconfigured. + * Writing this, if accepted, will block until array is quiescent + * readonly + * no resync can happen. no superblocks get written. + * write requests fail + * read-auto + * like readonly, but behaves like 'clean' on a write request. + * + * clean - no pending writes, but otherwise active. + * When written to inactive array, starts without resync + * If a write request arrives then + * if metadata is known, mark 'dirty' and switch to 'active'. + * if not known, block and switch to write-pending + * If written to an active array that has pending writes, then fails. + * active + * fully active: IO and resync can be happening. + * When written to inactive array, starts with resync + * + * write-pending + * clean, but writes are blocked waiting for 'active' to be written. + * + * active-idle + * like active, but no writes have been seen for a while (100msec). + * + * broken +* Array is failed. It's useful because mounted-arrays aren't stopped +* when array is failed, so this state will at least alert the user that +* something is wrong. + */ +enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, + write_pending, active_idle, broken, bad_word}; +static char *array_states[] = { + "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", + "write-pending", "active-idle", "broken", NULL }; + +static int match_word(const char *word, char **list) +{ + int n; + for (n=0; list[n]; n++) + if (cmd_match(word, list[n])) + break; + return n; +} + +static ssize_t +array_state_show(struct mddev *mddev, char *page) +{ + enum array_state st = inactive; + + if (mddev->pers && !test_bit(MD_NOT_READY, &mddev->flags)) { + switch(mddev->ro) { + case MD_RDONLY: + st = readonly; + break; + case MD_AUTO_READ: + st = read_auto; + break; + case MD_RDWR: + spin_lock(&mddev->lock); + if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) + st = write_pending; + else if (mddev->in_sync) + st = clean; + else if (mddev->safemode) + st = active_idle; + else + st = active; + spin_unlock(&mddev->lock); + } + + if (test_bit(MD_BROKEN, &mddev->flags) && st == clean) + st = broken; + } else { + if (list_empty(&mddev->disks) && + mddev->raid_disks == 0 && + mddev->dev_sectors == 0) + st = clear; + else + st = inactive; + } + return sprintf(page, "%s\n", array_states[st]); +} + +static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev); +static int md_set_readonly(struct mddev *mddev, struct block_device *bdev); +static int restart_array(struct mddev *mddev); + +static ssize_t +array_state_store(struct mddev *mddev, const char *buf, size_t len) +{ + int err = 0; + enum array_state st = match_word(buf, array_states); + + if (mddev->pers && (st == active || st == clean) && + mddev->ro != MD_RDONLY) { + /* don't take reconfig_mutex when toggling between + * clean and active + */ + spin_lock(&mddev->lock); + if (st == active) { + restart_array(mddev); + clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); + md_wakeup_thread(mddev->thread); + wake_up(&mddev->sb_wait); + } else /* st == clean */ { + restart_array(mddev); + if (!set_in_sync(mddev)) + err = -EBUSY; + } + if (!err) + sysfs_notify_dirent_safe(mddev->sysfs_state); + spin_unlock(&mddev->lock); + return err ?: len; + } + err = mddev_lock(mddev); + if (err) + return err; + err = -EINVAL; + switch(st) { + case bad_word: + break; + case clear: + /* stopping an active array */ + err = do_md_stop(mddev, 0, NULL); + break; + case inactive: + /* stopping an active array */ + if (mddev->pers) + err = do_md_stop(mddev, 2, NULL); + else + err = 0; /* already inactive */ + break; + case suspended: + break; /* not supported yet */ + case readonly: + if (mddev->pers) + err = md_set_readonly(mddev, NULL); + else { + mddev->ro = MD_RDONLY; + set_disk_ro(mddev->gendisk, 1); + err = do_md_run(mddev); + } + break; + case read_auto: + if (mddev->pers) { + if (md_is_rdwr(mddev)) + err = md_set_readonly(mddev, NULL); + else if (mddev->ro == MD_RDONLY) + err = restart_array(mddev); + if (err == 0) { + mddev->ro = MD_AUTO_READ; + set_disk_ro(mddev->gendisk, 0); + } + } else { + mddev->ro = MD_AUTO_READ; + err = do_md_run(mddev); + } + break; + case clean: + if (mddev->pers) { + err = restart_array(mddev); + if (err) + break; + spin_lock(&mddev->lock); + if (!set_in_sync(mddev)) + err = -EBUSY; + spin_unlock(&mddev->lock); + } else + err = -EINVAL; + break; + case active: + if (mddev->pers) { + err = restart_array(mddev); + if (err) + break; + clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); + wake_up(&mddev->sb_wait); + err = 0; + } else { + mddev->ro = MD_RDWR; + set_disk_ro(mddev->gendisk, 0); + err = do_md_run(mddev); + } + break; + case write_pending: + case active_idle: + case broken: + /* these cannot be set */ + break; + } + + if (!err) { + if (mddev->hold_active == UNTIL_IOCTL) + mddev->hold_active = 0; + sysfs_notify_dirent_safe(mddev->sysfs_state); + } + mddev_unlock(mddev); + return err ?: len; +} +static struct md_sysfs_entry md_array_state = +__ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); + +static ssize_t +max_corrected_read_errors_show(struct mddev *mddev, char *page) { + return sprintf(page, "%d\n", + atomic_read(&mddev->max_corr_read_errors)); +} + +static ssize_t +max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len) +{ + unsigned int n; + int rv; + + rv = kstrtouint(buf, 10, &n); + if (rv < 0) + return rv; + if (n > INT_MAX) + return -EINVAL; + atomic_set(&mddev->max_corr_read_errors, n); + return len; +} + +static struct md_sysfs_entry max_corr_read_errors = +__ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, + max_corrected_read_errors_store); + +static ssize_t +null_show(struct mddev *mddev, char *page) +{ + return -EINVAL; +} + +static ssize_t +new_dev_store(struct mddev *mddev, const char *buf, size_t len) +{ + /* buf must be %d:%d\n? giving major and minor numbers */ + /* The new device is added to the array. + * If the array has a persistent superblock, we read the + * superblock to initialise info and check validity. + * Otherwise, only checking done is that in bind_rdev_to_array, + * which mainly checks size. + */ + char *e; + int major = simple_strtoul(buf, &e, 10); + int minor; + dev_t dev; + struct md_rdev *rdev; + int err; + + if (!*buf || *e != ':' || !e[1] || e[1] == '\n') + return -EINVAL; + minor = simple_strtoul(e+1, &e, 10); + if (*e && *e != '\n') + return -EINVAL; + dev = MKDEV(major, minor); + if (major != MAJOR(dev) || + minor != MINOR(dev)) + return -EOVERFLOW; + + err = mddev_lock(mddev); + if (err) + return err; + if (mddev->persistent) { + rdev = md_import_device(dev, mddev->major_version, + mddev->minor_version); + if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { + struct md_rdev *rdev0 + = list_entry(mddev->disks.next, + struct md_rdev, same_set); + err = super_types[mddev->major_version] + .load_super(rdev, rdev0, mddev->minor_version); + if (err < 0) + goto out; + } + } else if (mddev->external) + rdev = md_import_device(dev, -2, -1); + else + rdev = md_import_device(dev, -1, -1); + + if (IS_ERR(rdev)) { + mddev_unlock(mddev); + return PTR_ERR(rdev); + } + err = bind_rdev_to_array(rdev, mddev); + out: + if (err) + export_rdev(rdev, mddev); + mddev_unlock(mddev); + if (!err) + md_new_event(); + return err ? err : len; +} + +static struct md_sysfs_entry md_new_device = +__ATTR(new_dev, S_IWUSR, null_show, new_dev_store); + +static ssize_t +bitmap_store(struct mddev *mddev, const char *buf, size_t len) +{ + char *end; + unsigned long chunk, end_chunk; + int err; + + err = mddev_lock(mddev); + if (err) + return err; + if (!mddev->bitmap) + goto out; + /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ + while (*buf) { + chunk = end_chunk = simple_strtoul(buf, &end, 0); + if (buf == end) break; + if (*end == '-') { /* range */ + buf = end + 1; + end_chunk = simple_strtoul(buf, &end, 0); + if (buf == end) break; + } + if (*end && !isspace(*end)) break; + md_bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); + buf = skip_spaces(end); + } + md_bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ +out: + mddev_unlock(mddev); + return len; +} + +static struct md_sysfs_entry md_bitmap = +__ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); + +static ssize_t +size_show(struct mddev *mddev, char *page) +{ + return sprintf(page, "%llu\n", + (unsigned long long)mddev->dev_sectors / 2); +} + +static int update_size(struct mddev *mddev, sector_t num_sectors); + +static ssize_t +size_store(struct mddev *mddev, const char *buf, size_t len) +{ + /* If array is inactive, we can reduce the component size, but + * not increase it (except from 0). + * If array is active, we can try an on-line resize + */ + sector_t sectors; + int err = strict_blocks_to_sectors(buf, §ors); + + if (err < 0) + return err; + err = mddev_lock(mddev); + if (err) + return err; + if (mddev->pers) { + err = update_size(mddev, sectors); + if (err == 0) + md_update_sb(mddev, 1); + } else { + if (mddev->dev_sectors == 0 || + mddev->dev_sectors > sectors) + mddev->dev_sectors = sectors; + else + err = -ENOSPC; + } + mddev_unlock(mddev); + return err ? err : len; +} + +static struct md_sysfs_entry md_size = +__ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); + +/* Metadata version. + * This is one of + * 'none' for arrays with no metadata (good luck...) + * 'external' for arrays with externally managed metadata, + * or N.M for internally known formats + */ +static ssize_t +metadata_show(struct mddev *mddev, char *page) +{ + if (mddev->persistent) + return sprintf(page, "%d.%d\n", + mddev->major_version, mddev->minor_version); + else if (mddev->external) + return sprintf(page, "external:%s\n", mddev->metadata_type); + else + return sprintf(page, "none\n"); +} + +static ssize_t +metadata_store(struct mddev *mddev, const char *buf, size_t len) +{ + int major, minor; + char *e; + int err; + /* Changing the details of 'external' metadata is + * always permitted. Otherwise there must be + * no devices attached to the array. + */ + + err = mddev_lock(mddev); + if (err) + return err; + err = -EBUSY; + if (mddev->external && strncmp(buf, "external:", 9) == 0) + ; + else if (!list_empty(&mddev->disks)) + goto out_unlock; + + err = 0; + if (cmd_match(buf, "none")) { + mddev->persistent = 0; + mddev->external = 0; + mddev->major_version = 0; + mddev->minor_version = 90; + goto out_unlock; + } + if (strncmp(buf, "external:", 9) == 0) { + size_t namelen = len-9; + if (namelen >= sizeof(mddev->metadata_type)) + namelen = sizeof(mddev->metadata_type)-1; + strncpy(mddev->metadata_type, buf+9, namelen); + mddev->metadata_type[namelen] = 0; + if (namelen && mddev->metadata_type[namelen-1] == '\n') + mddev->metadata_type[--namelen] = 0; + mddev->persistent = 0; + mddev->external = 1; + mddev->major_version = 0; + mddev->minor_version = 90; + goto out_unlock; + } + major = simple_strtoul(buf, &e, 10); + err = -EINVAL; + if (e==buf || *e != '.') + goto out_unlock; + buf = e+1; + minor = simple_strtoul(buf, &e, 10); + if (e==buf || (*e && *e != '\n') ) + goto out_unlock; + err = -ENOENT; + if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) + goto out_unlock; + mddev->major_version = major; + mddev->minor_version = minor; + mddev->persistent = 1; + mddev->external = 0; + err = 0; +out_unlock: + mddev_unlock(mddev); + return err ?: len; +} + +static struct md_sysfs_entry md_metadata = +__ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); + +static ssize_t +action_show(struct mddev *mddev, char *page) +{ + char *type = "idle"; + unsigned long recovery = mddev->recovery; + if (test_bit(MD_RECOVERY_FROZEN, &recovery)) + type = "frozen"; + else if (test_bit(MD_RECOVERY_RUNNING, &recovery) || + (md_is_rdwr(mddev) && test_bit(MD_RECOVERY_NEEDED, &recovery))) { + if (test_bit(MD_RECOVERY_RESHAPE, &recovery)) + type = "reshape"; + else if (test_bit(MD_RECOVERY_SYNC, &recovery)) { + if (!test_bit(MD_RECOVERY_REQUESTED, &recovery)) + type = "resync"; + else if (test_bit(MD_RECOVERY_CHECK, &recovery)) + type = "check"; + else + type = "repair"; + } else if (test_bit(MD_RECOVERY_RECOVER, &recovery)) + type = "recover"; + else if (mddev->reshape_position != MaxSector) + type = "reshape"; + } + return sprintf(page, "%s\n", type); +} + +static void stop_sync_thread(struct mddev *mddev) +{ + if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) + return; + + if (mddev_lock(mddev)) + return; + + /* + * Check again in case MD_RECOVERY_RUNNING is cleared before lock is + * held. + */ + if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) { + mddev_unlock(mddev); + return; + } + + if (work_pending(&mddev->del_work)) + flush_workqueue(md_misc_wq); + + set_bit(MD_RECOVERY_INTR, &mddev->recovery); + /* + * Thread might be blocked waiting for metadata update which will now + * never happen + */ + md_wakeup_thread_directly(mddev->sync_thread); + + mddev_unlock(mddev); +} + +static void idle_sync_thread(struct mddev *mddev) +{ + int sync_seq = atomic_read(&mddev->sync_seq); + + mutex_lock(&mddev->sync_mutex); + clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); + stop_sync_thread(mddev); + + wait_event(resync_wait, sync_seq != atomic_read(&mddev->sync_seq) || + !test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)); + + mutex_unlock(&mddev->sync_mutex); +} + +static void frozen_sync_thread(struct mddev *mddev) +{ + mutex_lock(&mddev->sync_mutex); + set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); + stop_sync_thread(mddev); + + wait_event(resync_wait, mddev->sync_thread == NULL && + !test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)); + + mutex_unlock(&mddev->sync_mutex); +} + +static ssize_t +action_store(struct mddev *mddev, const char *page, size_t len) +{ + if (!mddev->pers || !mddev->pers->sync_request) + return -EINVAL; + + + if (cmd_match(page, "idle")) + idle_sync_thread(mddev); + else if (cmd_match(page, "frozen")) + frozen_sync_thread(mddev); + else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) + return -EBUSY; + else if (cmd_match(page, "resync")) + clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); + else if (cmd_match(page, "recover")) { + clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); + set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); + } else if (cmd_match(page, "reshape")) { + int err; + if (mddev->pers->start_reshape == NULL) + return -EINVAL; + err = mddev_lock(mddev); + if (!err) { + if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) { + err = -EBUSY; + } else if (mddev->reshape_position == MaxSector || + mddev->pers->check_reshape == NULL || + mddev->pers->check_reshape(mddev)) { + clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); + err = mddev->pers->start_reshape(mddev); + } else { + /* + * If reshape is still in progress, and + * md_check_recovery() can continue to reshape, + * don't restart reshape because data can be + * corrupted for raid456. + */ + clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); + } + mddev_unlock(mddev); + } + if (err) + return err; + sysfs_notify_dirent_safe(mddev->sysfs_degraded); + } else { + if (cmd_match(page, "check")) + set_bit(MD_RECOVERY_CHECK, &mddev->recovery); + else if (!cmd_match(page, "repair")) + return -EINVAL; + clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); + set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); + set_bit(MD_RECOVERY_SYNC, &mddev->recovery); + } + if (mddev->ro == MD_AUTO_READ) { + /* A write to sync_action is enough to justify + * canceling read-auto mode + */ + mddev->ro = MD_RDWR; + md_wakeup_thread(mddev->sync_thread); + } + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + md_wakeup_thread(mddev->thread); + sysfs_notify_dirent_safe(mddev->sysfs_action); + return len; +} + +static struct md_sysfs_entry md_scan_mode = +__ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); + +static ssize_t +last_sync_action_show(struct mddev *mddev, char *page) +{ + return sprintf(page, "%s\n", mddev->last_sync_action); +} + +static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action); + +static ssize_t +mismatch_cnt_show(struct mddev *mddev, char *page) +{ + return sprintf(page, "%llu\n", + (unsigned long long) + atomic64_read(&mddev->resync_mismatches)); +} + +static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); + +static ssize_t +sync_min_show(struct mddev *mddev, char *page) +{ + return sprintf(page, "%d (%s)\n", speed_min(mddev), + mddev->sync_speed_min ? "local": "system"); +} + +static ssize_t +sync_min_store(struct mddev *mddev, const char *buf, size_t len) +{ + unsigned int min; + int rv; + + if (strncmp(buf, "system", 6)==0) { + min = 0; + } else { + rv = kstrtouint(buf, 10, &min); + if (rv < 0) + return rv; + if (min == 0) + return -EINVAL; + } + mddev->sync_speed_min = min; + return len; +} + +static struct md_sysfs_entry md_sync_min = +__ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); + +static ssize_t +sync_max_show(struct mddev *mddev, char *page) +{ + return sprintf(page, "%d (%s)\n", speed_max(mddev), + mddev->sync_speed_max ? "local": "system"); +} + +static ssize_t +sync_max_store(struct mddev *mddev, const char *buf, size_t len) +{ + unsigned int max; + int rv; + + if (strncmp(buf, "system", 6)==0) { + max = 0; + } else { + rv = kstrtouint(buf, 10, &max); + if (rv < 0) + return rv; + if (max == 0) + return -EINVAL; + } + mddev->sync_speed_max = max; + return len; +} + +static struct md_sysfs_entry md_sync_max = +__ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); + +static ssize_t +degraded_show(struct mddev *mddev, char *page) +{ + return sprintf(page, "%d\n", mddev->degraded); +} +static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); + +static ssize_t +sync_force_parallel_show(struct mddev *mddev, char *page) +{ + return sprintf(page, "%d\n", mddev->parallel_resync); +} + +static ssize_t +sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len) +{ + long n; + + if (kstrtol(buf, 10, &n)) + return -EINVAL; + + if (n != 0 && n != 1) + return -EINVAL; + + mddev->parallel_resync = n; + + if (mddev->sync_thread) + wake_up(&resync_wait); + + return len; +} + +/* force parallel resync, even with shared block devices */ +static struct md_sysfs_entry md_sync_force_parallel = +__ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, + sync_force_parallel_show, sync_force_parallel_store); + +static ssize_t +sync_speed_show(struct mddev *mddev, char *page) +{ + unsigned long resync, dt, db; + if (mddev->curr_resync == MD_RESYNC_NONE) + return sprintf(page, "none\n"); + resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); + dt = (jiffies - mddev->resync_mark) / HZ; + if (!dt) dt++; + db = resync - mddev->resync_mark_cnt; + return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ +} + +static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); + +static ssize_t +sync_completed_show(struct mddev *mddev, char *page) +{ + unsigned long long max_sectors, resync; + + if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) + return sprintf(page, "none\n"); + + if (mddev->curr_resync == MD_RESYNC_YIELDED || + mddev->curr_resync == MD_RESYNC_DELAYED) + return sprintf(page, "delayed\n"); + + if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || + test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) + max_sectors = mddev->resync_max_sectors; + else + max_sectors = mddev->dev_sectors; + + resync = mddev->curr_resync_completed; + return sprintf(page, "%llu / %llu\n", resync, max_sectors); +} + +static struct md_sysfs_entry md_sync_completed = + __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL); + +static ssize_t +min_sync_show(struct mddev *mddev, char *page) +{ + return sprintf(page, "%llu\n", + (unsigned long long)mddev->resync_min); +} +static ssize_t +min_sync_store(struct mddev *mddev, const char *buf, size_t len) +{ + unsigned long long min; + int err; + + if (kstrtoull(buf, 10, &min)) + return -EINVAL; + + spin_lock(&mddev->lock); + err = -EINVAL; + if (min > mddev->resync_max) + goto out_unlock; + + err = -EBUSY; + if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) + goto out_unlock; + + /* Round down to multiple of 4K for safety */ + mddev->resync_min = round_down(min, 8); + err = 0; + +out_unlock: + spin_unlock(&mddev->lock); + return err ?: len; +} + +static struct md_sysfs_entry md_min_sync = +__ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); + +static ssize_t +max_sync_show(struct mddev *mddev, char *page) +{ + if (mddev->resync_max == MaxSector) + return sprintf(page, "max\n"); + else + return sprintf(page, "%llu\n", + (unsigned long long)mddev->resync_max); +} +static ssize_t +max_sync_store(struct mddev *mddev, const char *buf, size_t len) +{ + int err; + spin_lock(&mddev->lock); + if (strncmp(buf, "max", 3) == 0) + mddev->resync_max = MaxSector; + else { + unsigned long long max; + int chunk; + + err = -EINVAL; + if (kstrtoull(buf, 10, &max)) + goto out_unlock; + if (max < mddev->resync_min) + goto out_unlock; + + err = -EBUSY; + if (max < mddev->resync_max && md_is_rdwr(mddev) && + test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) + goto out_unlock; + + /* Must be a multiple of chunk_size */ + chunk = mddev->chunk_sectors; + if (chunk) { + sector_t temp = max; + + err = -EINVAL; + if (sector_div(temp, chunk)) + goto out_unlock; + } + mddev->resync_max = max; + } + wake_up(&mddev->recovery_wait); + err = 0; +out_unlock: + spin_unlock(&mddev->lock); + return err ?: len; +} + +static struct md_sysfs_entry md_max_sync = +__ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); + +static ssize_t +suspend_lo_show(struct mddev *mddev, char *page) +{ + return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); +} + +static ssize_t +suspend_lo_store(struct mddev *mddev, const char *buf, size_t len) +{ + unsigned long long new; + int err; + + err = kstrtoull(buf, 10, &new); + if (err < 0) + return err; + if (new != (sector_t)new) + return -EINVAL; + + err = mddev_lock(mddev); + if (err) + return err; + err = -EINVAL; + if (mddev->pers == NULL || + mddev->pers->quiesce == NULL) + goto unlock; + mddev_suspend(mddev); + mddev->suspend_lo = new; + mddev_resume(mddev); + + err = 0; +unlock: + mddev_unlock(mddev); + return err ?: len; +} +static struct md_sysfs_entry md_suspend_lo = +__ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); + +static ssize_t +suspend_hi_show(struct mddev *mddev, char *page) +{ + return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); +} + +static ssize_t +suspend_hi_store(struct mddev *mddev, const char *buf, size_t len) +{ + unsigned long long new; + int err; + + err = kstrtoull(buf, 10, &new); + if (err < 0) + return err; + if (new != (sector_t)new) + return -EINVAL; + + err = mddev_lock(mddev); + if (err) + return err; + err = -EINVAL; + if (mddev->pers == NULL) + goto unlock; + + mddev_suspend(mddev); + mddev->suspend_hi = new; + mddev_resume(mddev); + + err = 0; +unlock: + mddev_unlock(mddev); + return err ?: len; +} +static struct md_sysfs_entry md_suspend_hi = +__ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); + +static ssize_t +reshape_position_show(struct mddev *mddev, char *page) +{ + if (mddev->reshape_position != MaxSector) + return sprintf(page, "%llu\n", + (unsigned long long)mddev->reshape_position); + strcpy(page, "none\n"); + return 5; +} + +static ssize_t +reshape_position_store(struct mddev *mddev, const char *buf, size_t len) +{ + struct md_rdev *rdev; + unsigned long long new; + int err; + + err = kstrtoull(buf, 10, &new); + if (err < 0) + return err; + if (new != (sector_t)new) + return -EINVAL; + err = mddev_lock(mddev); + if (err) + return err; + err = -EBUSY; + if (mddev->pers) + goto unlock; + mddev->reshape_position = new; + mddev->delta_disks = 0; + mddev->reshape_backwards = 0; + mddev->new_level = mddev->level; + mddev->new_layout = mddev->layout; + mddev->new_chunk_sectors = mddev->chunk_sectors; + rdev_for_each(rdev, mddev) + rdev->new_data_offset = rdev->data_offset; + err = 0; +unlock: + mddev_unlock(mddev); + return err ?: len; +} + +static struct md_sysfs_entry md_reshape_position = +__ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, + reshape_position_store); + +static ssize_t +reshape_direction_show(struct mddev *mddev, char *page) +{ + return sprintf(page, "%s\n", + mddev->reshape_backwards ? "backwards" : "forwards"); +} + +static ssize_t +reshape_direction_store(struct mddev *mddev, const char *buf, size_t len) +{ + int backwards = 0; + int err; + + if (cmd_match(buf, "forwards")) + backwards = 0; + else if (cmd_match(buf, "backwards")) + backwards = 1; + else + return -EINVAL; + if (mddev->reshape_backwards == backwards) + return len; + + err = mddev_lock(mddev); + if (err) + return err; + /* check if we are allowed to change */ + if (mddev->delta_disks) + err = -EBUSY; + else if (mddev->persistent && + mddev->major_version == 0) + err = -EINVAL; + else + mddev->reshape_backwards = backwards; + mddev_unlock(mddev); + return err ?: len; +} + +static struct md_sysfs_entry md_reshape_direction = +__ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show, + reshape_direction_store); + +static ssize_t +array_size_show(struct mddev *mddev, char *page) +{ + if (mddev->external_size) + return sprintf(page, "%llu\n", + (unsigned long long)mddev->array_sectors/2); + else + return sprintf(page, "default\n"); +} + +static ssize_t +array_size_store(struct mddev *mddev, const char *buf, size_t len) +{ + sector_t sectors; + int err; + + err = mddev_lock(mddev); + if (err) + return err; + + /* cluster raid doesn't support change array_sectors */ + if (mddev_is_clustered(mddev)) { + mddev_unlock(mddev); + return -EINVAL; + } + + if (strncmp(buf, "default", 7) == 0) { + if (mddev->pers) + sectors = mddev->pers->size(mddev, 0, 0); + else + sectors = mddev->array_sectors; + + mddev->external_size = 0; + } else { + if (strict_blocks_to_sectors(buf, §ors) < 0) + err = -EINVAL; + else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) + err = -E2BIG; + else + mddev->external_size = 1; + } + + if (!err) { + mddev->array_sectors = sectors; + if (mddev->pers) + set_capacity_and_notify(mddev->gendisk, + mddev->array_sectors); + } + mddev_unlock(mddev); + return err ?: len; +} + +static struct md_sysfs_entry md_array_size = +__ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, + array_size_store); + +static ssize_t +consistency_policy_show(struct mddev *mddev, char *page) +{ + int ret; + + if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) { + ret = sprintf(page, "journal\n"); + } else if (test_bit(MD_HAS_PPL, &mddev->flags)) { + ret = sprintf(page, "ppl\n"); + } else if (mddev->bitmap) { + ret = sprintf(page, "bitmap\n"); + } else if (mddev->pers) { + if (mddev->pers->sync_request) + ret = sprintf(page, "resync\n"); + else + ret = sprintf(page, "none\n"); + } else { + ret = sprintf(page, "unknown\n"); + } + + return ret; +} + +static ssize_t +consistency_policy_store(struct mddev *mddev, const char *buf, size_t len) +{ + int err = 0; + + if (mddev->pers) { + if (mddev->pers->change_consistency_policy) + err = mddev->pers->change_consistency_policy(mddev, buf); + else + err = -EBUSY; + } else if (mddev->external && strncmp(buf, "ppl", 3) == 0) { + set_bit(MD_HAS_PPL, &mddev->flags); + } else { + err = -EINVAL; + } + + return err ? err : len; +} + +static struct md_sysfs_entry md_consistency_policy = +__ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show, + consistency_policy_store); + +static ssize_t fail_last_dev_show(struct mddev *mddev, char *page) +{ + return sprintf(page, "%d\n", mddev->fail_last_dev); +} + +/* + * Setting fail_last_dev to true to allow last device to be forcibly removed + * from RAID1/RAID10. + */ +static ssize_t +fail_last_dev_store(struct mddev *mddev, const char *buf, size_t len) +{ + int ret; + bool value; + + ret = kstrtobool(buf, &value); + if (ret) + return ret; + + if (value != mddev->fail_last_dev) + mddev->fail_last_dev = value; + + return len; +} +static struct md_sysfs_entry md_fail_last_dev = +__ATTR(fail_last_dev, S_IRUGO | S_IWUSR, fail_last_dev_show, + fail_last_dev_store); + +static ssize_t serialize_policy_show(struct mddev *mddev, char *page) +{ + if (mddev->pers == NULL || (mddev->pers->level != 1)) + return sprintf(page, "n/a\n"); + else + return sprintf(page, "%d\n", mddev->serialize_policy); +} + +/* + * Setting serialize_policy to true to enforce write IO is not reordered + * for raid1. + */ +static ssize_t +serialize_policy_store(struct mddev *mddev, const char *buf, size_t len) +{ + int err; + bool value; + + err = kstrtobool(buf, &value); + if (err) + return err; + + if (value == mddev->serialize_policy) + return len; + + err = mddev_lock(mddev); + if (err) + return err; + if (mddev->pers == NULL || (mddev->pers->level != 1)) { + pr_err("md: serialize_policy is only effective for raid1\n"); + err = -EINVAL; + goto unlock; + } + + mddev_suspend(mddev); + if (value) + mddev_create_serial_pool(mddev, NULL, true); + else + mddev_destroy_serial_pool(mddev, NULL, true); + mddev->serialize_policy = value; + mddev_resume(mddev); +unlock: + mddev_unlock(mddev); + return err ?: len; +} + +static struct md_sysfs_entry md_serialize_policy = +__ATTR(serialize_policy, S_IRUGO | S_IWUSR, serialize_policy_show, + serialize_policy_store); + + +static struct attribute *md_default_attrs[] = { + &md_level.attr, + &md_layout.attr, + &md_raid_disks.attr, + &md_uuid.attr, + &md_chunk_size.attr, + &md_size.attr, + &md_resync_start.attr, + &md_metadata.attr, + &md_new_device.attr, + &md_safe_delay.attr, + &md_array_state.attr, + &md_reshape_position.attr, + &md_reshape_direction.attr, + &md_array_size.attr, + &max_corr_read_errors.attr, + &md_consistency_policy.attr, + &md_fail_last_dev.attr, + &md_serialize_policy.attr, + NULL, +}; + +static const struct attribute_group md_default_group = { + .attrs = md_default_attrs, +}; + +static struct attribute *md_redundancy_attrs[] = { + &md_scan_mode.attr, + &md_last_scan_mode.attr, + &md_mismatches.attr, + &md_sync_min.attr, + &md_sync_max.attr, + &md_sync_speed.attr, + &md_sync_force_parallel.attr, + &md_sync_completed.attr, + &md_min_sync.attr, + &md_max_sync.attr, + &md_suspend_lo.attr, + &md_suspend_hi.attr, + &md_bitmap.attr, + &md_degraded.attr, + NULL, +}; +static const struct attribute_group md_redundancy_group = { + .name = NULL, + .attrs = md_redundancy_attrs, +}; + +static const struct attribute_group *md_attr_groups[] = { + &md_default_group, + &md_bitmap_group, + NULL, +}; + +static ssize_t +md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) +{ + struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); + struct mddev *mddev = container_of(kobj, struct mddev, kobj); + ssize_t rv; + + if (!entry->show) + return -EIO; + spin_lock(&all_mddevs_lock); + if (!mddev_get(mddev)) { + spin_unlock(&all_mddevs_lock); + return -EBUSY; + } + spin_unlock(&all_mddevs_lock); + + rv = entry->show(mddev, page); + mddev_put(mddev); + return rv; +} + +static ssize_t +md_attr_store(struct kobject *kobj, struct attribute *attr, + const char *page, size_t length) +{ + struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); + struct mddev *mddev = container_of(kobj, struct mddev, kobj); + ssize_t rv; + + if (!entry->store) + return -EIO; + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + spin_lock(&all_mddevs_lock); + if (!mddev_get(mddev)) { + spin_unlock(&all_mddevs_lock); + return -EBUSY; + } + spin_unlock(&all_mddevs_lock); + rv = entry->store(mddev, page, length); + mddev_put(mddev); + return rv; +} + +static void md_kobj_release(struct kobject *ko) +{ + struct mddev *mddev = container_of(ko, struct mddev, kobj); + + if (mddev->sysfs_state) + sysfs_put(mddev->sysfs_state); + if (mddev->sysfs_level) + sysfs_put(mddev->sysfs_level); + + del_gendisk(mddev->gendisk); + put_disk(mddev->gendisk); +} + +static const struct sysfs_ops md_sysfs_ops = { + .show = md_attr_show, + .store = md_attr_store, +}; +static const struct kobj_type md_ktype = { + .release = md_kobj_release, + .sysfs_ops = &md_sysfs_ops, + .default_groups = md_attr_groups, +}; + +int mdp_major = 0; + +static void mddev_delayed_delete(struct work_struct *ws) +{ + struct mddev *mddev = container_of(ws, struct mddev, del_work); + + kobject_put(&mddev->kobj); +} + +static void no_op(struct percpu_ref *r) {} + +int mddev_init_writes_pending(struct mddev *mddev) +{ + if (mddev->writes_pending.percpu_count_ptr) + return 0; + if (percpu_ref_init(&mddev->writes_pending, no_op, + PERCPU_REF_ALLOW_REINIT, GFP_KERNEL) < 0) + return -ENOMEM; + /* We want to start with the refcount at zero */ + percpu_ref_put(&mddev->writes_pending); + return 0; +} +EXPORT_SYMBOL_GPL(mddev_init_writes_pending); + +struct mddev *md_alloc(dev_t dev, char *name) +{ + /* + * If dev is zero, name is the name of a device to allocate with + * an arbitrary minor number. It will be "md_???" + * If dev is non-zero it must be a device number with a MAJOR of + * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then + * the device is being created by opening a node in /dev. + * If "name" is not NULL, the device is being created by + * writing to /sys/module/md_mod/parameters/new_array. + */ + static DEFINE_MUTEX(disks_mutex); + struct mddev *mddev; + struct gendisk *disk; + int partitioned; + int shift; + int unit; + int error ; + + /* + * Wait for any previous instance of this device to be completely + * removed (mddev_delayed_delete). + */ + flush_workqueue(md_misc_wq); + + mutex_lock(&disks_mutex); + mddev = mddev_alloc(dev); + if (IS_ERR(mddev)) { + error = PTR_ERR(mddev); + goto out_unlock; + } + + partitioned = (MAJOR(mddev->unit) != MD_MAJOR); + shift = partitioned ? MdpMinorShift : 0; + unit = MINOR(mddev->unit) >> shift; + + if (name && !dev) { + /* Need to ensure that 'name' is not a duplicate. + */ + struct mddev *mddev2; + spin_lock(&all_mddevs_lock); + + list_for_each_entry(mddev2, &all_mddevs, all_mddevs) + if (mddev2->gendisk && + strcmp(mddev2->gendisk->disk_name, name) == 0) { + spin_unlock(&all_mddevs_lock); + error = -EEXIST; + goto out_free_mddev; + } + spin_unlock(&all_mddevs_lock); + } + if (name && dev) + /* + * Creating /dev/mdNNN via "newarray", so adjust hold_active. + */ + mddev->hold_active = UNTIL_STOP; + + error = -ENOMEM; + disk = blk_alloc_disk(NUMA_NO_NODE); + if (!disk) + goto out_free_mddev; + + disk->major = MAJOR(mddev->unit); + disk->first_minor = unit << shift; + disk->minors = 1 << shift; + if (name) + strcpy(disk->disk_name, name); + else if (partitioned) + sprintf(disk->disk_name, "md_d%d", unit); + else + sprintf(disk->disk_name, "md%d", unit); + disk->fops = &md_fops; + disk->private_data = mddev; + + mddev->queue = disk->queue; + blk_set_stacking_limits(&mddev->queue->limits); + blk_queue_write_cache(mddev->queue, true, true); + disk->events |= DISK_EVENT_MEDIA_CHANGE; + mddev->gendisk = disk; + error = add_disk(disk); + if (error) + goto out_put_disk; + + kobject_init(&mddev->kobj, &md_ktype); + error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md"); + if (error) { + /* + * The disk is already live at this point. Clear the hold flag + * and let mddev_put take care of the deletion, as it isn't any + * different from a normal close on last release now. + */ + mddev->hold_active = 0; + mutex_unlock(&disks_mutex); + mddev_put(mddev); + return ERR_PTR(error); + } + + kobject_uevent(&mddev->kobj, KOBJ_ADD); + mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); + mddev->sysfs_level = sysfs_get_dirent_safe(mddev->kobj.sd, "level"); + mutex_unlock(&disks_mutex); + return mddev; + +out_put_disk: + put_disk(disk); +out_free_mddev: + mddev_free(mddev); +out_unlock: + mutex_unlock(&disks_mutex); + return ERR_PTR(error); +} + +static int md_alloc_and_put(dev_t dev, char *name) +{ + struct mddev *mddev = md_alloc(dev, name); + + if (IS_ERR(mddev)) + return PTR_ERR(mddev); + mddev_put(mddev); + return 0; +} + +static void md_probe(dev_t dev) +{ + if (MAJOR(dev) == MD_MAJOR && MINOR(dev) >= 512) + return; + if (create_on_open) + md_alloc_and_put(dev, NULL); +} + +static int add_named_array(const char *val, const struct kernel_param *kp) +{ + /* + * val must be "md_*" or "mdNNN". + * For "md_*" we allocate an array with a large free minor number, and + * set the name to val. val must not already be an active name. + * For "mdNNN" we allocate an array with the minor number NNN + * which must not already be in use. + */ + int len = strlen(val); + char buf[DISK_NAME_LEN]; + unsigned long devnum; + + while (len && val[len-1] == '\n') + len--; + if (len >= DISK_NAME_LEN) + return -E2BIG; + strscpy(buf, val, len+1); + if (strncmp(buf, "md_", 3) == 0) + return md_alloc_and_put(0, buf); + if (strncmp(buf, "md", 2) == 0 && + isdigit(buf[2]) && + kstrtoul(buf+2, 10, &devnum) == 0 && + devnum <= MINORMASK) + return md_alloc_and_put(MKDEV(MD_MAJOR, devnum), NULL); + + return -EINVAL; +} + +static void md_safemode_timeout(struct timer_list *t) +{ + struct mddev *mddev = from_timer(mddev, t, safemode_timer); + + mddev->safemode = 1; + if (mddev->external) + sysfs_notify_dirent_safe(mddev->sysfs_state); + + md_wakeup_thread(mddev->thread); +} + +static int start_dirty_degraded; +static void active_io_release(struct percpu_ref *ref) +{ + struct mddev *mddev = container_of(ref, struct mddev, active_io); + + wake_up(&mddev->sb_wait); +} + +int md_run(struct mddev *mddev) +{ + int err; + struct md_rdev *rdev; + struct md_personality *pers; + bool nowait = true; + + if (list_empty(&mddev->disks)) + /* cannot run an array with no devices.. */ + return -EINVAL; + + if (mddev->pers) + return -EBUSY; + /* Cannot run until previous stop completes properly */ + if (mddev->sysfs_active) + return -EBUSY; + + /* + * Analyze all RAID superblock(s) + */ + if (!mddev->raid_disks) { + if (!mddev->persistent) + return -EINVAL; + err = analyze_sbs(mddev); + if (err) + return -EINVAL; + } + + if (mddev->level != LEVEL_NONE) + request_module("md-level-%d", mddev->level); + else if (mddev->clevel[0]) + request_module("md-%s", mddev->clevel); + + /* + * Drop all container device buffers, from now on + * the only valid external interface is through the md + * device. + */ + mddev->has_superblocks = false; + rdev_for_each(rdev, mddev) { + if (test_bit(Faulty, &rdev->flags)) + continue; + sync_blockdev(rdev->bdev); + invalidate_bdev(rdev->bdev); + if (mddev->ro != MD_RDONLY && rdev_read_only(rdev)) { + mddev->ro = MD_RDONLY; + if (mddev->gendisk) + set_disk_ro(mddev->gendisk, 1); + } + + if (rdev->sb_page) + mddev->has_superblocks = true; + + /* perform some consistency tests on the device. + * We don't want the data to overlap the metadata, + * Internal Bitmap issues have been handled elsewhere. + */ + if (rdev->meta_bdev) { + /* Nothing to check */; + } else if (rdev->data_offset < rdev->sb_start) { + if (mddev->dev_sectors && + rdev->data_offset + mddev->dev_sectors + > rdev->sb_start) { + pr_warn("md: %s: data overlaps metadata\n", + mdname(mddev)); + return -EINVAL; + } + } else { + if (rdev->sb_start + rdev->sb_size/512 + > rdev->data_offset) { + pr_warn("md: %s: metadata overlaps data\n", + mdname(mddev)); + return -EINVAL; + } + } + sysfs_notify_dirent_safe(rdev->sysfs_state); + nowait = nowait && bdev_nowait(rdev->bdev); + } + + err = percpu_ref_init(&mddev->active_io, active_io_release, + PERCPU_REF_ALLOW_REINIT, GFP_KERNEL); + if (err) + return err; + + if (!bioset_initialized(&mddev->bio_set)) { + err = bioset_init(&mddev->bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); + if (err) + goto exit_active_io; + } + if (!bioset_initialized(&mddev->sync_set)) { + err = bioset_init(&mddev->sync_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); + if (err) + goto exit_bio_set; + } + + if (!bioset_initialized(&mddev->io_clone_set)) { + err = bioset_init(&mddev->io_clone_set, BIO_POOL_SIZE, + offsetof(struct md_io_clone, bio_clone), 0); + if (err) + goto exit_sync_set; + } + + spin_lock(&pers_lock); + pers = find_pers(mddev->level, mddev->clevel); + if (!pers || !try_module_get(pers->owner)) { + spin_unlock(&pers_lock); + if (mddev->level != LEVEL_NONE) + pr_warn("md: personality for level %d is not loaded!\n", + mddev->level); + else + pr_warn("md: personality for level %s is not loaded!\n", + mddev->clevel); + err = -EINVAL; + goto abort; + } + spin_unlock(&pers_lock); + if (mddev->level != pers->level) { + mddev->level = pers->level; + mddev->new_level = pers->level; + } + strscpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); + + if (mddev->reshape_position != MaxSector && + pers->start_reshape == NULL) { + /* This personality cannot handle reshaping... */ + module_put(pers->owner); + err = -EINVAL; + goto abort; + } + + if (pers->sync_request) { + /* Warn if this is a potentially silly + * configuration. + */ + struct md_rdev *rdev2; + int warned = 0; + + rdev_for_each(rdev, mddev) + rdev_for_each(rdev2, mddev) { + if (rdev < rdev2 && + rdev->bdev->bd_disk == + rdev2->bdev->bd_disk) { + pr_warn("%s: WARNING: %pg appears to be on the same physical disk as %pg.\n", + mdname(mddev), + rdev->bdev, + rdev2->bdev); + warned = 1; + } + } + + if (warned) + pr_warn("True protection against single-disk failure might be compromised.\n"); + } + + mddev->recovery = 0; + /* may be over-ridden by personality */ + mddev->resync_max_sectors = mddev->dev_sectors; + + mddev->ok_start_degraded = start_dirty_degraded; + + if (start_readonly && md_is_rdwr(mddev)) + mddev->ro = MD_AUTO_READ; /* read-only, but switch on first write */ + + err = pers->run(mddev); + if (err) + pr_warn("md: pers->run() failed ...\n"); + else if (pers->size(mddev, 0, 0) < mddev->array_sectors) { + WARN_ONCE(!mddev->external_size, + "%s: default size too small, but 'external_size' not in effect?\n", + __func__); + pr_warn("md: invalid array_size %llu > default size %llu\n", + (unsigned long long)mddev->array_sectors / 2, + (unsigned long long)pers->size(mddev, 0, 0) / 2); + err = -EINVAL; + } + if (err == 0 && pers->sync_request && + (mddev->bitmap_info.file || mddev->bitmap_info.offset)) { + struct bitmap *bitmap; + + bitmap = md_bitmap_create(mddev, -1); + if (IS_ERR(bitmap)) { + err = PTR_ERR(bitmap); + pr_warn("%s: failed to create bitmap (%d)\n", + mdname(mddev), err); + } else + mddev->bitmap = bitmap; + + } + if (err) + goto bitmap_abort; + + if (mddev->bitmap_info.max_write_behind > 0) { + bool create_pool = false; + + rdev_for_each(rdev, mddev) { + if (test_bit(WriteMostly, &rdev->flags) && + rdev_init_serial(rdev)) + create_pool = true; + } + if (create_pool && mddev->serial_info_pool == NULL) { + mddev->serial_info_pool = + mempool_create_kmalloc_pool(NR_SERIAL_INFOS, + sizeof(struct serial_info)); + if (!mddev->serial_info_pool) { + err = -ENOMEM; + goto bitmap_abort; + } + } + } + + if (mddev->queue) { + bool nonrot = true; + + rdev_for_each(rdev, mddev) { + if (rdev->raid_disk >= 0 && !bdev_nonrot(rdev->bdev)) { + nonrot = false; + break; + } + } + if (mddev->degraded) + nonrot = false; + if (nonrot) + blk_queue_flag_set(QUEUE_FLAG_NONROT, mddev->queue); + else + blk_queue_flag_clear(QUEUE_FLAG_NONROT, mddev->queue); + blk_queue_flag_set(QUEUE_FLAG_IO_STAT, mddev->queue); + + /* Set the NOWAIT flags if all underlying devices support it */ + if (nowait) + blk_queue_flag_set(QUEUE_FLAG_NOWAIT, mddev->queue); + } + if (pers->sync_request) { + if (mddev->kobj.sd && + sysfs_create_group(&mddev->kobj, &md_redundancy_group)) + pr_warn("md: cannot register extra attributes for %s\n", + mdname(mddev)); + mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); + mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed"); + mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded"); + } else if (mddev->ro == MD_AUTO_READ) + mddev->ro = MD_RDWR; + + atomic_set(&mddev->max_corr_read_errors, + MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); + mddev->safemode = 0; + if (mddev_is_clustered(mddev)) + mddev->safemode_delay = 0; + else + mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY; + mddev->in_sync = 1; + smp_wmb(); + spin_lock(&mddev->lock); + mddev->pers = pers; + spin_unlock(&mddev->lock); + rdev_for_each(rdev, mddev) + if (rdev->raid_disk >= 0) + sysfs_link_rdev(mddev, rdev); /* failure here is OK */ + + if (mddev->degraded && md_is_rdwr(mddev)) + /* This ensures that recovering status is reported immediately + * via sysfs - until a lack of spares is confirmed. + */ + set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + + if (mddev->sb_flags) + md_update_sb(mddev, 0); + + md_new_event(); + return 0; + +bitmap_abort: + mddev_detach(mddev); + if (mddev->private) + pers->free(mddev, mddev->private); + mddev->private = NULL; + module_put(pers->owner); + md_bitmap_destroy(mddev); +abort: + bioset_exit(&mddev->io_clone_set); +exit_sync_set: + bioset_exit(&mddev->sync_set); +exit_bio_set: + bioset_exit(&mddev->bio_set); +exit_active_io: + percpu_ref_exit(&mddev->active_io); + return err; +} +EXPORT_SYMBOL_GPL(md_run); + +int do_md_run(struct mddev *mddev) +{ + int err; + + set_bit(MD_NOT_READY, &mddev->flags); + err = md_run(mddev); + if (err) + goto out; + err = md_bitmap_load(mddev); + if (err) { + md_bitmap_destroy(mddev); + goto out; + } + + if (mddev_is_clustered(mddev)) + md_allow_write(mddev); + + /* run start up tasks that require md_thread */ + md_start(mddev); + + md_wakeup_thread(mddev->thread); + md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ + + set_capacity_and_notify(mddev->gendisk, mddev->array_sectors); + clear_bit(MD_NOT_READY, &mddev->flags); + mddev->changed = 1; + kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); + sysfs_notify_dirent_safe(mddev->sysfs_state); + sysfs_notify_dirent_safe(mddev->sysfs_action); + sysfs_notify_dirent_safe(mddev->sysfs_degraded); +out: + clear_bit(MD_NOT_READY, &mddev->flags); + return err; +} + +int md_start(struct mddev *mddev) +{ + int ret = 0; + + if (mddev->pers->start) { + set_bit(MD_RECOVERY_WAIT, &mddev->recovery); + md_wakeup_thread(mddev->thread); + ret = mddev->pers->start(mddev); + clear_bit(MD_RECOVERY_WAIT, &mddev->recovery); + md_wakeup_thread(mddev->sync_thread); + } + return ret; +} +EXPORT_SYMBOL_GPL(md_start); + +static int restart_array(struct mddev *mddev) +{ + struct gendisk *disk = mddev->gendisk; + struct md_rdev *rdev; + bool has_journal = false; + bool has_readonly = false; + + /* Complain if it has no devices */ + if (list_empty(&mddev->disks)) + return -ENXIO; + if (!mddev->pers) + return -EINVAL; + if (md_is_rdwr(mddev)) + return -EBUSY; + + rcu_read_lock(); + rdev_for_each_rcu(rdev, mddev) { + if (test_bit(Journal, &rdev->flags) && + !test_bit(Faulty, &rdev->flags)) + has_journal = true; + if (rdev_read_only(rdev)) + has_readonly = true; + } + rcu_read_unlock(); + if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && !has_journal) + /* Don't restart rw with journal missing/faulty */ + return -EINVAL; + if (has_readonly) + return -EROFS; + + mddev->safemode = 0; + mddev->ro = MD_RDWR; + set_disk_ro(disk, 0); + pr_debug("md: %s switched to read-write mode.\n", mdname(mddev)); + /* Kick recovery or resync if necessary */ + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + md_wakeup_thread(mddev->thread); + md_wakeup_thread(mddev->sync_thread); + sysfs_notify_dirent_safe(mddev->sysfs_state); + return 0; +} + +static void md_clean(struct mddev *mddev) +{ + mddev->array_sectors = 0; + mddev->external_size = 0; + mddev->dev_sectors = 0; + mddev->raid_disks = 0; + mddev->recovery_cp = 0; + mddev->resync_min = 0; + mddev->resync_max = MaxSector; + mddev->reshape_position = MaxSector; + /* we still need mddev->external in export_rdev, do not clear it yet */ + mddev->persistent = 0; + mddev->level = LEVEL_NONE; + mddev->clevel[0] = 0; + mddev->flags = 0; + mddev->sb_flags = 0; + mddev->ro = MD_RDWR; + mddev->metadata_type[0] = 0; + mddev->chunk_sectors = 0; + mddev->ctime = mddev->utime = 0; + mddev->layout = 0; + mddev->max_disks = 0; + mddev->events = 0; + mddev->can_decrease_events = 0; + mddev->delta_disks = 0; + mddev->reshape_backwards = 0; + mddev->new_level = LEVEL_NONE; + mddev->new_layout = 0; + mddev->new_chunk_sectors = 0; + mddev->curr_resync = MD_RESYNC_NONE; + atomic64_set(&mddev->resync_mismatches, 0); + mddev->suspend_lo = mddev->suspend_hi = 0; + mddev->sync_speed_min = mddev->sync_speed_max = 0; + mddev->recovery = 0; + mddev->in_sync = 0; + mddev->changed = 0; + mddev->degraded = 0; + mddev->safemode = 0; + mddev->private = NULL; + mddev->cluster_info = NULL; + mddev->bitmap_info.offset = 0; + mddev->bitmap_info.default_offset = 0; + mddev->bitmap_info.default_space = 0; + mddev->bitmap_info.chunksize = 0; + mddev->bitmap_info.daemon_sleep = 0; + mddev->bitmap_info.max_write_behind = 0; + mddev->bitmap_info.nodes = 0; +} + +static void __md_stop_writes(struct mddev *mddev) +{ + set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); + if (work_pending(&mddev->del_work)) + flush_workqueue(md_misc_wq); + if (mddev->sync_thread) { + set_bit(MD_RECOVERY_INTR, &mddev->recovery); + md_reap_sync_thread(mddev); + } + + del_timer_sync(&mddev->safemode_timer); + + if (mddev->pers && mddev->pers->quiesce) { + mddev->pers->quiesce(mddev, 1); + mddev->pers->quiesce(mddev, 0); + } + md_bitmap_flush(mddev); + + if (md_is_rdwr(mddev) && + ((!mddev->in_sync && !mddev_is_clustered(mddev)) || + mddev->sb_flags)) { + /* mark array as shutdown cleanly */ + if (!mddev_is_clustered(mddev)) + mddev->in_sync = 1; + md_update_sb(mddev, 1); + } + /* disable policy to guarantee rdevs free resources for serialization */ + mddev->serialize_policy = 0; + mddev_destroy_serial_pool(mddev, NULL, true); +} + +void md_stop_writes(struct mddev *mddev) +{ + mddev_lock_nointr(mddev); + __md_stop_writes(mddev); + mddev_unlock(mddev); +} +EXPORT_SYMBOL_GPL(md_stop_writes); + +static void mddev_detach(struct mddev *mddev) +{ + md_bitmap_wait_behind_writes(mddev); + if (mddev->pers && mddev->pers->quiesce && !is_md_suspended(mddev)) { + mddev->pers->quiesce(mddev, 1); + mddev->pers->quiesce(mddev, 0); + } + md_unregister_thread(mddev, &mddev->thread); + if (mddev->queue) + blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ +} + +static void __md_stop(struct mddev *mddev) +{ + struct md_personality *pers = mddev->pers; + md_bitmap_destroy(mddev); + mddev_detach(mddev); + /* Ensure ->event_work is done */ + if (mddev->event_work.func) + flush_workqueue(md_misc_wq); + spin_lock(&mddev->lock); + mddev->pers = NULL; + spin_unlock(&mddev->lock); + if (mddev->private) + pers->free(mddev, mddev->private); + mddev->private = NULL; + if (pers->sync_request && mddev->to_remove == NULL) + mddev->to_remove = &md_redundancy_group; + module_put(pers->owner); + clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); + + percpu_ref_exit(&mddev->active_io); + bioset_exit(&mddev->bio_set); + bioset_exit(&mddev->sync_set); + bioset_exit(&mddev->io_clone_set); +} + +void md_stop(struct mddev *mddev) +{ + lockdep_assert_held(&mddev->reconfig_mutex); + + /* stop the array and free an attached data structures. + * This is called from dm-raid + */ + __md_stop_writes(mddev); + __md_stop(mddev); + percpu_ref_exit(&mddev->writes_pending); +} + +EXPORT_SYMBOL_GPL(md_stop); + +static int md_set_readonly(struct mddev *mddev, struct block_device *bdev) +{ + int err = 0; + int did_freeze = 0; + + if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) + return -EBUSY; + + if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { + did_freeze = 1; + set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); + md_wakeup_thread(mddev->thread); + } + if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) + set_bit(MD_RECOVERY_INTR, &mddev->recovery); + + /* + * Thread might be blocked waiting for metadata update which will now + * never happen + */ + md_wakeup_thread_directly(mddev->sync_thread); + + mddev_unlock(mddev); + wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING, + &mddev->recovery)); + wait_event(mddev->sb_wait, + !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)); + mddev_lock_nointr(mddev); + + mutex_lock(&mddev->open_mutex); + if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || + mddev->sync_thread || + test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) { + pr_warn("md: %s still in use.\n",mdname(mddev)); + err = -EBUSY; + goto out; + } + + if (mddev->pers) { + __md_stop_writes(mddev); + + if (mddev->ro == MD_RDONLY) { + err = -ENXIO; + goto out; + } + + mddev->ro = MD_RDONLY; + set_disk_ro(mddev->gendisk, 1); + } + +out: + if ((mddev->pers && !err) || did_freeze) { + clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + md_wakeup_thread(mddev->thread); + sysfs_notify_dirent_safe(mddev->sysfs_state); + } + + mutex_unlock(&mddev->open_mutex); + return err; +} + +/* mode: + * 0 - completely stop and dis-assemble array + * 2 - stop but do not disassemble array + */ +static int do_md_stop(struct mddev *mddev, int mode, + struct block_device *bdev) +{ + struct gendisk *disk = mddev->gendisk; + struct md_rdev *rdev; + int did_freeze = 0; + + if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { + did_freeze = 1; + set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); + md_wakeup_thread(mddev->thread); + } + if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) + set_bit(MD_RECOVERY_INTR, &mddev->recovery); + + /* + * Thread might be blocked waiting for metadata update which will now + * never happen + */ + md_wakeup_thread_directly(mddev->sync_thread); + + mddev_unlock(mddev); + wait_event(resync_wait, (mddev->sync_thread == NULL && + !test_bit(MD_RECOVERY_RUNNING, + &mddev->recovery))); + mddev_lock_nointr(mddev); + + mutex_lock(&mddev->open_mutex); + if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || + mddev->sysfs_active || + mddev->sync_thread || + test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) { + pr_warn("md: %s still in use.\n",mdname(mddev)); + mutex_unlock(&mddev->open_mutex); + if (did_freeze) { + clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + md_wakeup_thread(mddev->thread); + } + return -EBUSY; + } + if (mddev->pers) { + if (!md_is_rdwr(mddev)) + set_disk_ro(disk, 0); + + __md_stop_writes(mddev); + __md_stop(mddev); + + /* tell userspace to handle 'inactive' */ + sysfs_notify_dirent_safe(mddev->sysfs_state); + + rdev_for_each(rdev, mddev) + if (rdev->raid_disk >= 0) + sysfs_unlink_rdev(mddev, rdev); + + set_capacity_and_notify(disk, 0); + mutex_unlock(&mddev->open_mutex); + mddev->changed = 1; + + if (!md_is_rdwr(mddev)) + mddev->ro = MD_RDWR; + } else + mutex_unlock(&mddev->open_mutex); + /* + * Free resources if final stop + */ + if (mode == 0) { + pr_info("md: %s stopped.\n", mdname(mddev)); + + if (mddev->bitmap_info.file) { + struct file *f = mddev->bitmap_info.file; + spin_lock(&mddev->lock); + mddev->bitmap_info.file = NULL; + spin_unlock(&mddev->lock); + fput(f); + } + mddev->bitmap_info.offset = 0; + + export_array(mddev); + + md_clean(mddev); + if (mddev->hold_active == UNTIL_STOP) + mddev->hold_active = 0; + } + md_new_event(); + sysfs_notify_dirent_safe(mddev->sysfs_state); + return 0; +} + +#ifndef MODULE +static void autorun_array(struct mddev *mddev) +{ + struct md_rdev *rdev; + int err; + + if (list_empty(&mddev->disks)) + return; + + pr_info("md: running: "); + + rdev_for_each(rdev, mddev) { + pr_cont("<%pg>", rdev->bdev); + } + pr_cont("\n"); + + err = do_md_run(mddev); + if (err) { + pr_warn("md: do_md_run() returned %d\n", err); + do_md_stop(mddev, 0, NULL); + } +} + +/* + * lets try to run arrays based on all disks that have arrived + * until now. (those are in pending_raid_disks) + * + * the method: pick the first pending disk, collect all disks with + * the same UUID, remove all from the pending list and put them into + * the 'same_array' list. Then order this list based on superblock + * update time (freshest comes first), kick out 'old' disks and + * compare superblocks. If everything's fine then run it. + * + * If "unit" is allocated, then bump its reference count + */ +static void autorun_devices(int part) +{ + struct md_rdev *rdev0, *rdev, *tmp; + struct mddev *mddev; + + pr_info("md: autorun ...\n"); + while (!list_empty(&pending_raid_disks)) { + int unit; + dev_t dev; + LIST_HEAD(candidates); + rdev0 = list_entry(pending_raid_disks.next, + struct md_rdev, same_set); + + pr_debug("md: considering %pg ...\n", rdev0->bdev); + INIT_LIST_HEAD(&candidates); + rdev_for_each_list(rdev, tmp, &pending_raid_disks) + if (super_90_load(rdev, rdev0, 0) >= 0) { + pr_debug("md: adding %pg ...\n", + rdev->bdev); + list_move(&rdev->same_set, &candidates); + } + /* + * now we have a set of devices, with all of them having + * mostly sane superblocks. It's time to allocate the + * mddev. + */ + if (part) { + dev = MKDEV(mdp_major, + rdev0->preferred_minor << MdpMinorShift); + unit = MINOR(dev) >> MdpMinorShift; + } else { + dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); + unit = MINOR(dev); + } + if (rdev0->preferred_minor != unit) { + pr_warn("md: unit number in %pg is bad: %d\n", + rdev0->bdev, rdev0->preferred_minor); + break; + } + + mddev = md_alloc(dev, NULL); + if (IS_ERR(mddev)) + break; + + if (mddev_lock(mddev)) + pr_warn("md: %s locked, cannot run\n", mdname(mddev)); + else if (mddev->raid_disks || mddev->major_version + || !list_empty(&mddev->disks)) { + pr_warn("md: %s already running, cannot run %pg\n", + mdname(mddev), rdev0->bdev); + mddev_unlock(mddev); + } else { + pr_debug("md: created %s\n", mdname(mddev)); + mddev->persistent = 1; + rdev_for_each_list(rdev, tmp, &candidates) { + list_del_init(&rdev->same_set); + if (bind_rdev_to_array(rdev, mddev)) + export_rdev(rdev, mddev); + } + autorun_array(mddev); + mddev_unlock(mddev); + } + /* on success, candidates will be empty, on error + * it won't... + */ + rdev_for_each_list(rdev, tmp, &candidates) { + list_del_init(&rdev->same_set); + export_rdev(rdev, mddev); + } + mddev_put(mddev); + } + pr_info("md: ... autorun DONE.\n"); +} +#endif /* !MODULE */ + +static int get_version(void __user *arg) +{ + mdu_version_t ver; + + ver.major = MD_MAJOR_VERSION; + ver.minor = MD_MINOR_VERSION; + ver.patchlevel = MD_PATCHLEVEL_VERSION; + + if (copy_to_user(arg, &ver, sizeof(ver))) + return -EFAULT; + + return 0; +} + +static int get_array_info(struct mddev *mddev, void __user *arg) +{ + mdu_array_info_t info; + int nr,working,insync,failed,spare; + struct md_rdev *rdev; + + nr = working = insync = failed = spare = 0; + rcu_read_lock(); + rdev_for_each_rcu(rdev, mddev) { + nr++; + if (test_bit(Faulty, &rdev->flags)) + failed++; + else { + working++; + if (test_bit(In_sync, &rdev->flags)) + insync++; + else if (test_bit(Journal, &rdev->flags)) + /* TODO: add journal count to md_u.h */ + ; + else + spare++; + } + } + rcu_read_unlock(); + + info.major_version = mddev->major_version; + info.minor_version = mddev->minor_version; + info.patch_version = MD_PATCHLEVEL_VERSION; + info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX); + info.level = mddev->level; + info.size = mddev->dev_sectors / 2; + if (info.size != mddev->dev_sectors / 2) /* overflow */ + info.size = -1; + info.nr_disks = nr; + info.raid_disks = mddev->raid_disks; + info.md_minor = mddev->md_minor; + info.not_persistent= !mddev->persistent; + + info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX); + info.state = 0; + if (mddev->in_sync) + info.state = (1<<MD_SB_CLEAN); + if (mddev->bitmap && mddev->bitmap_info.offset) + info.state |= (1<<MD_SB_BITMAP_PRESENT); + if (mddev_is_clustered(mddev)) + info.state |= (1<<MD_SB_CLUSTERED); + info.active_disks = insync; + info.working_disks = working; + info.failed_disks = failed; + info.spare_disks = spare; + + info.layout = mddev->layout; + info.chunk_size = mddev->chunk_sectors << 9; + + if (copy_to_user(arg, &info, sizeof(info))) + return -EFAULT; + + return 0; +} + +static int get_bitmap_file(struct mddev *mddev, void __user * arg) +{ + mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ + char *ptr; + int err; + + file = kzalloc(sizeof(*file), GFP_NOIO); + if (!file) + return -ENOMEM; + + err = 0; + spin_lock(&mddev->lock); + /* bitmap enabled */ + if (mddev->bitmap_info.file) { + ptr = file_path(mddev->bitmap_info.file, file->pathname, + sizeof(file->pathname)); + if (IS_ERR(ptr)) + err = PTR_ERR(ptr); + else + memmove(file->pathname, ptr, + sizeof(file->pathname)-(ptr-file->pathname)); + } + spin_unlock(&mddev->lock); + + if (err == 0 && + copy_to_user(arg, file, sizeof(*file))) + err = -EFAULT; + + kfree(file); + return err; +} + +static int get_disk_info(struct mddev *mddev, void __user * arg) +{ + mdu_disk_info_t info; + struct md_rdev *rdev; + + if (copy_from_user(&info, arg, sizeof(info))) + return -EFAULT; + + rcu_read_lock(); + rdev = md_find_rdev_nr_rcu(mddev, info.number); + if (rdev) { + info.major = MAJOR(rdev->bdev->bd_dev); + info.minor = MINOR(rdev->bdev->bd_dev); + info.raid_disk = rdev->raid_disk; + info.state = 0; + if (test_bit(Faulty, &rdev->flags)) + info.state |= (1<<MD_DISK_FAULTY); + else if (test_bit(In_sync, &rdev->flags)) { + info.state |= (1<<MD_DISK_ACTIVE); + info.state |= (1<<MD_DISK_SYNC); + } + if (test_bit(Journal, &rdev->flags)) + info.state |= (1<<MD_DISK_JOURNAL); + if (test_bit(WriteMostly, &rdev->flags)) + info.state |= (1<<MD_DISK_WRITEMOSTLY); + if (test_bit(FailFast, &rdev->flags)) + info.state |= (1<<MD_DISK_FAILFAST); + } else { + info.major = info.minor = 0; + info.raid_disk = -1; + info.state = (1<<MD_DISK_REMOVED); + } + rcu_read_unlock(); + + if (copy_to_user(arg, &info, sizeof(info))) + return -EFAULT; + + return 0; +} + +int md_add_new_disk(struct mddev *mddev, struct mdu_disk_info_s *info) +{ + struct md_rdev *rdev; + dev_t dev = MKDEV(info->major,info->minor); + + if (mddev_is_clustered(mddev) && + !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) { + pr_warn("%s: Cannot add to clustered mddev.\n", + mdname(mddev)); + return -EINVAL; + } + + if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) + return -EOVERFLOW; + + if (!mddev->raid_disks) { + int err; + /* expecting a device which has a superblock */ + rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); + if (IS_ERR(rdev)) { + pr_warn("md: md_import_device returned %ld\n", + PTR_ERR(rdev)); + return PTR_ERR(rdev); + } + if (!list_empty(&mddev->disks)) { + struct md_rdev *rdev0 + = list_entry(mddev->disks.next, + struct md_rdev, same_set); + err = super_types[mddev->major_version] + .load_super(rdev, rdev0, mddev->minor_version); + if (err < 0) { + pr_warn("md: %pg has different UUID to %pg\n", + rdev->bdev, + rdev0->bdev); + export_rdev(rdev, mddev); + return -EINVAL; + } + } + err = bind_rdev_to_array(rdev, mddev); + if (err) + export_rdev(rdev, mddev); + return err; + } + + /* + * md_add_new_disk can be used once the array is assembled + * to add "hot spares". They must already have a superblock + * written + */ + if (mddev->pers) { + int err; + if (!mddev->pers->hot_add_disk) { + pr_warn("%s: personality does not support diskops!\n", + mdname(mddev)); + return -EINVAL; + } + if (mddev->persistent) + rdev = md_import_device(dev, mddev->major_version, + mddev->minor_version); + else + rdev = md_import_device(dev, -1, -1); + if (IS_ERR(rdev)) { + pr_warn("md: md_import_device returned %ld\n", + PTR_ERR(rdev)); + return PTR_ERR(rdev); + } + /* set saved_raid_disk if appropriate */ + if (!mddev->persistent) { + if (info->state & (1<<MD_DISK_SYNC) && + info->raid_disk < mddev->raid_disks) { + rdev->raid_disk = info->raid_disk; + clear_bit(Bitmap_sync, &rdev->flags); + } else + rdev->raid_disk = -1; + rdev->saved_raid_disk = rdev->raid_disk; + } else + super_types[mddev->major_version]. + validate_super(mddev, rdev); + if ((info->state & (1<<MD_DISK_SYNC)) && + rdev->raid_disk != info->raid_disk) { + /* This was a hot-add request, but events doesn't + * match, so reject it. + */ + export_rdev(rdev, mddev); + return -EINVAL; + } + + clear_bit(In_sync, &rdev->flags); /* just to be sure */ + if (info->state & (1<<MD_DISK_WRITEMOSTLY)) + set_bit(WriteMostly, &rdev->flags); + else + clear_bit(WriteMostly, &rdev->flags); + if (info->state & (1<<MD_DISK_FAILFAST)) + set_bit(FailFast, &rdev->flags); + else + clear_bit(FailFast, &rdev->flags); + + if (info->state & (1<<MD_DISK_JOURNAL)) { + struct md_rdev *rdev2; + bool has_journal = false; + + /* make sure no existing journal disk */ + rdev_for_each(rdev2, mddev) { + if (test_bit(Journal, &rdev2->flags)) { + has_journal = true; + break; + } + } + if (has_journal || mddev->bitmap) { + export_rdev(rdev, mddev); + return -EBUSY; + } + set_bit(Journal, &rdev->flags); + } + /* + * check whether the device shows up in other nodes + */ + if (mddev_is_clustered(mddev)) { + if (info->state & (1 << MD_DISK_CANDIDATE)) + set_bit(Candidate, &rdev->flags); + else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) { + /* --add initiated by this node */ + err = md_cluster_ops->add_new_disk(mddev, rdev); + if (err) { + export_rdev(rdev, mddev); + return err; + } + } + } + + rdev->raid_disk = -1; + err = bind_rdev_to_array(rdev, mddev); + + if (err) + export_rdev(rdev, mddev); + + if (mddev_is_clustered(mddev)) { + if (info->state & (1 << MD_DISK_CANDIDATE)) { + if (!err) { + err = md_cluster_ops->new_disk_ack(mddev, + err == 0); + if (err) + md_kick_rdev_from_array(rdev); + } + } else { + if (err) + md_cluster_ops->add_new_disk_cancel(mddev); + else + err = add_bound_rdev(rdev); + } + + } else if (!err) + err = add_bound_rdev(rdev); + + return err; + } + + /* otherwise, md_add_new_disk is only allowed + * for major_version==0 superblocks + */ + if (mddev->major_version != 0) { + pr_warn("%s: ADD_NEW_DISK not supported\n", mdname(mddev)); + return -EINVAL; + } + + if (!(info->state & (1<<MD_DISK_FAULTY))) { + int err; + rdev = md_import_device(dev, -1, 0); + if (IS_ERR(rdev)) { + pr_warn("md: error, md_import_device() returned %ld\n", + PTR_ERR(rdev)); + return PTR_ERR(rdev); + } + rdev->desc_nr = info->number; + if (info->raid_disk < mddev->raid_disks) + rdev->raid_disk = info->raid_disk; + else + rdev->raid_disk = -1; + + if (rdev->raid_disk < mddev->raid_disks) + if (info->state & (1<<MD_DISK_SYNC)) + set_bit(In_sync, &rdev->flags); + + if (info->state & (1<<MD_DISK_WRITEMOSTLY)) + set_bit(WriteMostly, &rdev->flags); + if (info->state & (1<<MD_DISK_FAILFAST)) + set_bit(FailFast, &rdev->flags); + + if (!mddev->persistent) { + pr_debug("md: nonpersistent superblock ...\n"); + rdev->sb_start = bdev_nr_sectors(rdev->bdev); + } else + rdev->sb_start = calc_dev_sboffset(rdev); + rdev->sectors = rdev->sb_start; + + err = bind_rdev_to_array(rdev, mddev); + if (err) { + export_rdev(rdev, mddev); + return err; + } + } + + return 0; +} + +static int hot_remove_disk(struct mddev *mddev, dev_t dev) +{ + struct md_rdev *rdev; + + if (!mddev->pers) + return -ENODEV; + + rdev = find_rdev(mddev, dev); + if (!rdev) + return -ENXIO; + + if (rdev->raid_disk < 0) + goto kick_rdev; + + clear_bit(Blocked, &rdev->flags); + remove_and_add_spares(mddev, rdev); + + if (rdev->raid_disk >= 0) + goto busy; + +kick_rdev: + if (mddev_is_clustered(mddev)) { + if (md_cluster_ops->remove_disk(mddev, rdev)) + goto busy; + } + + md_kick_rdev_from_array(rdev); + set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); + if (mddev->thread) + md_wakeup_thread(mddev->thread); + else + md_update_sb(mddev, 1); + md_new_event(); + + return 0; +busy: + pr_debug("md: cannot remove active disk %pg from %s ...\n", + rdev->bdev, mdname(mddev)); + return -EBUSY; +} + +static int hot_add_disk(struct mddev *mddev, dev_t dev) +{ + int err; + struct md_rdev *rdev; + + if (!mddev->pers) + return -ENODEV; + + if (mddev->major_version != 0) { + pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n", + mdname(mddev)); + return -EINVAL; + } + if (!mddev->pers->hot_add_disk) { + pr_warn("%s: personality does not support diskops!\n", + mdname(mddev)); + return -EINVAL; + } + + rdev = md_import_device(dev, -1, 0); + if (IS_ERR(rdev)) { + pr_warn("md: error, md_import_device() returned %ld\n", + PTR_ERR(rdev)); + return -EINVAL; + } + + if (mddev->persistent) + rdev->sb_start = calc_dev_sboffset(rdev); + else + rdev->sb_start = bdev_nr_sectors(rdev->bdev); + + rdev->sectors = rdev->sb_start; + + if (test_bit(Faulty, &rdev->flags)) { + pr_warn("md: can not hot-add faulty %pg disk to %s!\n", + rdev->bdev, mdname(mddev)); + err = -EINVAL; + goto abort_export; + } + + clear_bit(In_sync, &rdev->flags); + rdev->desc_nr = -1; + rdev->saved_raid_disk = -1; + err = bind_rdev_to_array(rdev, mddev); + if (err) + goto abort_export; + + /* + * The rest should better be atomic, we can have disk failures + * noticed in interrupt contexts ... + */ + + rdev->raid_disk = -1; + + set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); + if (!mddev->thread) + md_update_sb(mddev, 1); + /* + * If the new disk does not support REQ_NOWAIT, + * disable on the whole MD. + */ + if (!bdev_nowait(rdev->bdev)) { + pr_info("%s: Disabling nowait because %pg does not support nowait\n", + mdname(mddev), rdev->bdev); + blk_queue_flag_clear(QUEUE_FLAG_NOWAIT, mddev->queue); + } + /* + * Kick recovery, maybe this spare has to be added to the + * array immediately. + */ + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + md_wakeup_thread(mddev->thread); + md_new_event(); + return 0; + +abort_export: + export_rdev(rdev, mddev); + return err; +} + +static int set_bitmap_file(struct mddev *mddev, int fd) +{ + int err = 0; + + if (mddev->pers) { + if (!mddev->pers->quiesce || !mddev->thread) + return -EBUSY; + if (mddev->recovery || mddev->sync_thread) + return -EBUSY; + /* we should be able to change the bitmap.. */ + } + + if (fd >= 0) { + struct inode *inode; + struct file *f; + + if (mddev->bitmap || mddev->bitmap_info.file) + return -EEXIST; /* cannot add when bitmap is present */ + + if (!IS_ENABLED(CONFIG_MD_BITMAP_FILE)) { + pr_warn("%s: bitmap files not supported by this kernel\n", + mdname(mddev)); + return -EINVAL; + } + pr_warn("%s: using deprecated bitmap file support\n", + mdname(mddev)); + + f = fget(fd); + + if (f == NULL) { + pr_warn("%s: error: failed to get bitmap file\n", + mdname(mddev)); + return -EBADF; + } + + inode = f->f_mapping->host; + if (!S_ISREG(inode->i_mode)) { + pr_warn("%s: error: bitmap file must be a regular file\n", + mdname(mddev)); + err = -EBADF; + } else if (!(f->f_mode & FMODE_WRITE)) { + pr_warn("%s: error: bitmap file must open for write\n", + mdname(mddev)); + err = -EBADF; + } else if (atomic_read(&inode->i_writecount) != 1) { + pr_warn("%s: error: bitmap file is already in use\n", + mdname(mddev)); + err = -EBUSY; + } + if (err) { + fput(f); + return err; + } + mddev->bitmap_info.file = f; + mddev->bitmap_info.offset = 0; /* file overrides offset */ + } else if (mddev->bitmap == NULL) + return -ENOENT; /* cannot remove what isn't there */ + err = 0; + if (mddev->pers) { + if (fd >= 0) { + struct bitmap *bitmap; + + bitmap = md_bitmap_create(mddev, -1); + mddev_suspend(mddev); + if (!IS_ERR(bitmap)) { + mddev->bitmap = bitmap; + err = md_bitmap_load(mddev); + } else + err = PTR_ERR(bitmap); + if (err) { + md_bitmap_destroy(mddev); + fd = -1; + } + mddev_resume(mddev); + } else if (fd < 0) { + mddev_suspend(mddev); + md_bitmap_destroy(mddev); + mddev_resume(mddev); + } + } + if (fd < 0) { + struct file *f = mddev->bitmap_info.file; + if (f) { + spin_lock(&mddev->lock); + mddev->bitmap_info.file = NULL; + spin_unlock(&mddev->lock); + fput(f); + } + } + + return err; +} + +/* + * md_set_array_info is used two different ways + * The original usage is when creating a new array. + * In this usage, raid_disks is > 0 and it together with + * level, size, not_persistent,layout,chunksize determine the + * shape of the array. + * This will always create an array with a type-0.90.0 superblock. + * The newer usage is when assembling an array. + * In this case raid_disks will be 0, and the major_version field is + * use to determine which style super-blocks are to be found on the devices. + * The minor and patch _version numbers are also kept incase the + * super_block handler wishes to interpret them. + */ +int md_set_array_info(struct mddev *mddev, struct mdu_array_info_s *info) +{ + if (info->raid_disks == 0) { + /* just setting version number for superblock loading */ + if (info->major_version < 0 || + info->major_version >= ARRAY_SIZE(super_types) || + super_types[info->major_version].name == NULL) { + /* maybe try to auto-load a module? */ + pr_warn("md: superblock version %d not known\n", + info->major_version); + return -EINVAL; + } + mddev->major_version = info->major_version; + mddev->minor_version = info->minor_version; + mddev->patch_version = info->patch_version; + mddev->persistent = !info->not_persistent; + /* ensure mddev_put doesn't delete this now that there + * is some minimal configuration. + */ + mddev->ctime = ktime_get_real_seconds(); + return 0; + } + mddev->major_version = MD_MAJOR_VERSION; + mddev->minor_version = MD_MINOR_VERSION; + mddev->patch_version = MD_PATCHLEVEL_VERSION; + mddev->ctime = ktime_get_real_seconds(); + + mddev->level = info->level; + mddev->clevel[0] = 0; + mddev->dev_sectors = 2 * (sector_t)info->size; + mddev->raid_disks = info->raid_disks; + /* don't set md_minor, it is determined by which /dev/md* was + * openned + */ + if (info->state & (1<<MD_SB_CLEAN)) + mddev->recovery_cp = MaxSector; + else + mddev->recovery_cp = 0; + mddev->persistent = ! info->not_persistent; + mddev->external = 0; + + mddev->layout = info->layout; + if (mddev->level == 0) + /* Cannot trust RAID0 layout info here */ + mddev->layout = -1; + mddev->chunk_sectors = info->chunk_size >> 9; + + if (mddev->persistent) { + mddev->max_disks = MD_SB_DISKS; + mddev->flags = 0; + mddev->sb_flags = 0; + } + set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); + + mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; + mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); + mddev->bitmap_info.offset = 0; + + mddev->reshape_position = MaxSector; + + /* + * Generate a 128 bit UUID + */ + get_random_bytes(mddev->uuid, 16); + + mddev->new_level = mddev->level; + mddev->new_chunk_sectors = mddev->chunk_sectors; + mddev->new_layout = mddev->layout; + mddev->delta_disks = 0; + mddev->reshape_backwards = 0; + + return 0; +} + +void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors) +{ + lockdep_assert_held(&mddev->reconfig_mutex); + + if (mddev->external_size) + return; + + mddev->array_sectors = array_sectors; +} +EXPORT_SYMBOL(md_set_array_sectors); + +static int update_size(struct mddev *mddev, sector_t num_sectors) +{ + struct md_rdev *rdev; + int rv; + int fit = (num_sectors == 0); + sector_t old_dev_sectors = mddev->dev_sectors; + + if (mddev->pers->resize == NULL) + return -EINVAL; + /* The "num_sectors" is the number of sectors of each device that + * is used. This can only make sense for arrays with redundancy. + * linear and raid0 always use whatever space is available. We can only + * consider changing this number if no resync or reconstruction is + * happening, and if the new size is acceptable. It must fit before the + * sb_start or, if that is <data_offset, it must fit before the size + * of each device. If num_sectors is zero, we find the largest size + * that fits. + */ + if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || + mddev->sync_thread) + return -EBUSY; + if (!md_is_rdwr(mddev)) + return -EROFS; + + rdev_for_each(rdev, mddev) { + sector_t avail = rdev->sectors; + + if (fit && (num_sectors == 0 || num_sectors > avail)) + num_sectors = avail; + if (avail < num_sectors) + return -ENOSPC; + } + rv = mddev->pers->resize(mddev, num_sectors); + if (!rv) { + if (mddev_is_clustered(mddev)) + md_cluster_ops->update_size(mddev, old_dev_sectors); + else if (mddev->queue) { + set_capacity_and_notify(mddev->gendisk, + mddev->array_sectors); + } + } + return rv; +} + +static int update_raid_disks(struct mddev *mddev, int raid_disks) +{ + int rv; + struct md_rdev *rdev; + /* change the number of raid disks */ + if (mddev->pers->check_reshape == NULL) + return -EINVAL; + if (!md_is_rdwr(mddev)) + return -EROFS; + if (raid_disks <= 0 || + (mddev->max_disks && raid_disks >= mddev->max_disks)) + return -EINVAL; + if (mddev->sync_thread || + test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || + test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) || + mddev->reshape_position != MaxSector) + return -EBUSY; + + rdev_for_each(rdev, mddev) { + if (mddev->raid_disks < raid_disks && + rdev->data_offset < rdev->new_data_offset) + return -EINVAL; + if (mddev->raid_disks > raid_disks && + rdev->data_offset > rdev->new_data_offset) + return -EINVAL; + } + + mddev->delta_disks = raid_disks - mddev->raid_disks; + if (mddev->delta_disks < 0) + mddev->reshape_backwards = 1; + else if (mddev->delta_disks > 0) + mddev->reshape_backwards = 0; + + rv = mddev->pers->check_reshape(mddev); + if (rv < 0) { + mddev->delta_disks = 0; + mddev->reshape_backwards = 0; + } + return rv; +} + +/* + * update_array_info is used to change the configuration of an + * on-line array. + * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size + * fields in the info are checked against the array. + * Any differences that cannot be handled will cause an error. + * Normally, only one change can be managed at a time. + */ +static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) +{ + int rv = 0; + int cnt = 0; + int state = 0; + + /* calculate expected state,ignoring low bits */ + if (mddev->bitmap && mddev->bitmap_info.offset) + state |= (1 << MD_SB_BITMAP_PRESENT); + + if (mddev->major_version != info->major_version || + mddev->minor_version != info->minor_version || +/* mddev->patch_version != info->patch_version || */ + mddev->ctime != info->ctime || + mddev->level != info->level || +/* mddev->layout != info->layout || */ + mddev->persistent != !info->not_persistent || + mddev->chunk_sectors != info->chunk_size >> 9 || + /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ + ((state^info->state) & 0xfffffe00) + ) + return -EINVAL; + /* Check there is only one change */ + if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) + cnt++; + if (mddev->raid_disks != info->raid_disks) + cnt++; + if (mddev->layout != info->layout) + cnt++; + if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) + cnt++; + if (cnt == 0) + return 0; + if (cnt > 1) + return -EINVAL; + + if (mddev->layout != info->layout) { + /* Change layout + * we don't need to do anything at the md level, the + * personality will take care of it all. + */ + if (mddev->pers->check_reshape == NULL) + return -EINVAL; + else { + mddev->new_layout = info->layout; + rv = mddev->pers->check_reshape(mddev); + if (rv) + mddev->new_layout = mddev->layout; + return rv; + } + } + if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) + rv = update_size(mddev, (sector_t)info->size * 2); + + if (mddev->raid_disks != info->raid_disks) + rv = update_raid_disks(mddev, info->raid_disks); + + if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { + if (mddev->pers->quiesce == NULL || mddev->thread == NULL) { + rv = -EINVAL; + goto err; + } + if (mddev->recovery || mddev->sync_thread) { + rv = -EBUSY; + goto err; + } + if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { + struct bitmap *bitmap; + /* add the bitmap */ + if (mddev->bitmap) { + rv = -EEXIST; + goto err; + } + if (mddev->bitmap_info.default_offset == 0) { + rv = -EINVAL; + goto err; + } + mddev->bitmap_info.offset = + mddev->bitmap_info.default_offset; + mddev->bitmap_info.space = + mddev->bitmap_info.default_space; + bitmap = md_bitmap_create(mddev, -1); + mddev_suspend(mddev); + if (!IS_ERR(bitmap)) { + mddev->bitmap = bitmap; + rv = md_bitmap_load(mddev); + } else + rv = PTR_ERR(bitmap); + if (rv) + md_bitmap_destroy(mddev); + mddev_resume(mddev); + } else { + /* remove the bitmap */ + if (!mddev->bitmap) { + rv = -ENOENT; + goto err; + } + if (mddev->bitmap->storage.file) { + rv = -EINVAL; + goto err; + } + if (mddev->bitmap_info.nodes) { + /* hold PW on all the bitmap lock */ + if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) { + pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n"); + rv = -EPERM; + md_cluster_ops->unlock_all_bitmaps(mddev); + goto err; + } + + mddev->bitmap_info.nodes = 0; + md_cluster_ops->leave(mddev); + module_put(md_cluster_mod); + mddev->safemode_delay = DEFAULT_SAFEMODE_DELAY; + } + mddev_suspend(mddev); + md_bitmap_destroy(mddev); + mddev_resume(mddev); + mddev->bitmap_info.offset = 0; + } + } + md_update_sb(mddev, 1); + return rv; +err: + return rv; +} + +static int set_disk_faulty(struct mddev *mddev, dev_t dev) +{ + struct md_rdev *rdev; + int err = 0; + + if (mddev->pers == NULL) + return -ENODEV; + + rcu_read_lock(); + rdev = md_find_rdev_rcu(mddev, dev); + if (!rdev) + err = -ENODEV; + else { + md_error(mddev, rdev); + if (test_bit(MD_BROKEN, &mddev->flags)) + err = -EBUSY; + } + rcu_read_unlock(); + return err; +} + +/* + * We have a problem here : there is no easy way to give a CHS + * virtual geometry. We currently pretend that we have a 2 heads + * 4 sectors (with a BIG number of cylinders...). This drives + * dosfs just mad... ;-) + */ +static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) +{ + struct mddev *mddev = bdev->bd_disk->private_data; + + geo->heads = 2; + geo->sectors = 4; + geo->cylinders = mddev->array_sectors / 8; + return 0; +} + +static inline bool md_ioctl_valid(unsigned int cmd) +{ + switch (cmd) { + case ADD_NEW_DISK: + case GET_ARRAY_INFO: + case GET_BITMAP_FILE: + case GET_DISK_INFO: + case HOT_ADD_DISK: + case HOT_REMOVE_DISK: + case RAID_VERSION: + case RESTART_ARRAY_RW: + case RUN_ARRAY: + case SET_ARRAY_INFO: + case SET_BITMAP_FILE: + case SET_DISK_FAULTY: + case STOP_ARRAY: + case STOP_ARRAY_RO: + case CLUSTERED_DISK_NACK: + return true; + default: + return false; + } +} + +static int __md_set_array_info(struct mddev *mddev, void __user *argp) +{ + mdu_array_info_t info; + int err; + + if (!argp) + memset(&info, 0, sizeof(info)); + else if (copy_from_user(&info, argp, sizeof(info))) + return -EFAULT; + + if (mddev->pers) { + err = update_array_info(mddev, &info); + if (err) + pr_warn("md: couldn't update array info. %d\n", err); + return err; + } + + if (!list_empty(&mddev->disks)) { + pr_warn("md: array %s already has disks!\n", mdname(mddev)); + return -EBUSY; + } + + if (mddev->raid_disks) { + pr_warn("md: array %s already initialised!\n", mdname(mddev)); + return -EBUSY; + } + + err = md_set_array_info(mddev, &info); + if (err) + pr_warn("md: couldn't set array info. %d\n", err); + + return err; +} + +static int md_ioctl(struct block_device *bdev, blk_mode_t mode, + unsigned int cmd, unsigned long arg) +{ + int err = 0; + void __user *argp = (void __user *)arg; + struct mddev *mddev = NULL; + bool did_set_md_closing = false; + + if (!md_ioctl_valid(cmd)) + return -ENOTTY; + + switch (cmd) { + case RAID_VERSION: + case GET_ARRAY_INFO: + case GET_DISK_INFO: + break; + default: + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + } + + /* + * Commands dealing with the RAID driver but not any + * particular array: + */ + switch (cmd) { + case RAID_VERSION: + err = get_version(argp); + goto out; + default:; + } + + /* + * Commands creating/starting a new array: + */ + + mddev = bdev->bd_disk->private_data; + + if (!mddev) { + BUG(); + goto out; + } + + /* Some actions do not requires the mutex */ + switch (cmd) { + case GET_ARRAY_INFO: + if (!mddev->raid_disks && !mddev->external) + err = -ENODEV; + else + err = get_array_info(mddev, argp); + goto out; + + case GET_DISK_INFO: + if (!mddev->raid_disks && !mddev->external) + err = -ENODEV; + else + err = get_disk_info(mddev, argp); + goto out; + + case SET_DISK_FAULTY: + err = set_disk_faulty(mddev, new_decode_dev(arg)); + goto out; + + case GET_BITMAP_FILE: + err = get_bitmap_file(mddev, argp); + goto out; + + } + + if (cmd == HOT_REMOVE_DISK) + /* need to ensure recovery thread has run */ + wait_event_interruptible_timeout(mddev->sb_wait, + !test_bit(MD_RECOVERY_NEEDED, + &mddev->recovery), + msecs_to_jiffies(5000)); + if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) { + /* Need to flush page cache, and ensure no-one else opens + * and writes + */ + mutex_lock(&mddev->open_mutex); + if (mddev->pers && atomic_read(&mddev->openers) > 1) { + mutex_unlock(&mddev->open_mutex); + err = -EBUSY; + goto out; + } + if (test_and_set_bit(MD_CLOSING, &mddev->flags)) { + mutex_unlock(&mddev->open_mutex); + err = -EBUSY; + goto out; + } + did_set_md_closing = true; + mutex_unlock(&mddev->open_mutex); + sync_blockdev(bdev); + } + err = mddev_lock(mddev); + if (err) { + pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n", + err, cmd); + goto out; + } + + if (cmd == SET_ARRAY_INFO) { + err = __md_set_array_info(mddev, argp); + goto unlock; + } + + /* + * Commands querying/configuring an existing array: + */ + /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, + * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ + if ((!mddev->raid_disks && !mddev->external) + && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY + && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE + && cmd != GET_BITMAP_FILE) { + err = -ENODEV; + goto unlock; + } + + /* + * Commands even a read-only array can execute: + */ + switch (cmd) { + case RESTART_ARRAY_RW: + err = restart_array(mddev); + goto unlock; + + case STOP_ARRAY: + err = do_md_stop(mddev, 0, bdev); + goto unlock; + + case STOP_ARRAY_RO: + err = md_set_readonly(mddev, bdev); + goto unlock; + + case HOT_REMOVE_DISK: + err = hot_remove_disk(mddev, new_decode_dev(arg)); + goto unlock; + + case ADD_NEW_DISK: + /* We can support ADD_NEW_DISK on read-only arrays + * only if we are re-adding a preexisting device. + * So require mddev->pers and MD_DISK_SYNC. + */ + if (mddev->pers) { + mdu_disk_info_t info; + if (copy_from_user(&info, argp, sizeof(info))) + err = -EFAULT; + else if (!(info.state & (1<<MD_DISK_SYNC))) + /* Need to clear read-only for this */ + break; + else + err = md_add_new_disk(mddev, &info); + goto unlock; + } + break; + } + + /* + * The remaining ioctls are changing the state of the + * superblock, so we do not allow them on read-only arrays. + */ + if (!md_is_rdwr(mddev) && mddev->pers) { + if (mddev->ro != MD_AUTO_READ) { + err = -EROFS; + goto unlock; + } + mddev->ro = MD_RDWR; + sysfs_notify_dirent_safe(mddev->sysfs_state); + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + /* mddev_unlock will wake thread */ + /* If a device failed while we were read-only, we + * need to make sure the metadata is updated now. + */ + if (test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) { + mddev_unlock(mddev); + wait_event(mddev->sb_wait, + !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) && + !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)); + mddev_lock_nointr(mddev); + } + } + + switch (cmd) { + case ADD_NEW_DISK: + { + mdu_disk_info_t info; + if (copy_from_user(&info, argp, sizeof(info))) + err = -EFAULT; + else + err = md_add_new_disk(mddev, &info); + goto unlock; + } + + case CLUSTERED_DISK_NACK: + if (mddev_is_clustered(mddev)) + md_cluster_ops->new_disk_ack(mddev, false); + else + err = -EINVAL; + goto unlock; + + case HOT_ADD_DISK: + err = hot_add_disk(mddev, new_decode_dev(arg)); + goto unlock; + + case RUN_ARRAY: + err = do_md_run(mddev); + goto unlock; + + case SET_BITMAP_FILE: + err = set_bitmap_file(mddev, (int)arg); + goto unlock; + + default: + err = -EINVAL; + goto unlock; + } + +unlock: + if (mddev->hold_active == UNTIL_IOCTL && + err != -EINVAL) + mddev->hold_active = 0; + mddev_unlock(mddev); +out: + if(did_set_md_closing) + clear_bit(MD_CLOSING, &mddev->flags); + return err; +} +#ifdef CONFIG_COMPAT +static int md_compat_ioctl(struct block_device *bdev, blk_mode_t mode, + unsigned int cmd, unsigned long arg) +{ + switch (cmd) { + case HOT_REMOVE_DISK: + case HOT_ADD_DISK: + case SET_DISK_FAULTY: + case SET_BITMAP_FILE: + /* These take in integer arg, do not convert */ + break; + default: + arg = (unsigned long)compat_ptr(arg); + break; + } + + return md_ioctl(bdev, mode, cmd, arg); +} +#endif /* CONFIG_COMPAT */ + +static int md_set_read_only(struct block_device *bdev, bool ro) +{ + struct mddev *mddev = bdev->bd_disk->private_data; + int err; + + err = mddev_lock(mddev); + if (err) + return err; + + if (!mddev->raid_disks && !mddev->external) { + err = -ENODEV; + goto out_unlock; + } + + /* + * Transitioning to read-auto need only happen for arrays that call + * md_write_start and which are not ready for writes yet. + */ + if (!ro && mddev->ro == MD_RDONLY && mddev->pers) { + err = restart_array(mddev); + if (err) + goto out_unlock; + mddev->ro = MD_AUTO_READ; + } + +out_unlock: + mddev_unlock(mddev); + return err; +} + +static int md_open(struct gendisk *disk, blk_mode_t mode) +{ + struct mddev *mddev; + int err; + + spin_lock(&all_mddevs_lock); + mddev = mddev_get(disk->private_data); + spin_unlock(&all_mddevs_lock); + if (!mddev) + return -ENODEV; + + err = mutex_lock_interruptible(&mddev->open_mutex); + if (err) + goto out; + + err = -ENODEV; + if (test_bit(MD_CLOSING, &mddev->flags)) + goto out_unlock; + + atomic_inc(&mddev->openers); + mutex_unlock(&mddev->open_mutex); + + disk_check_media_change(disk); + return 0; + +out_unlock: + mutex_unlock(&mddev->open_mutex); +out: + mddev_put(mddev); + return err; +} + +static void md_release(struct gendisk *disk) +{ + struct mddev *mddev = disk->private_data; + + BUG_ON(!mddev); + atomic_dec(&mddev->openers); + mddev_put(mddev); +} + +static unsigned int md_check_events(struct gendisk *disk, unsigned int clearing) +{ + struct mddev *mddev = disk->private_data; + unsigned int ret = 0; + + if (mddev->changed) + ret = DISK_EVENT_MEDIA_CHANGE; + mddev->changed = 0; + return ret; +} + +static void md_free_disk(struct gendisk *disk) +{ + struct mddev *mddev = disk->private_data; + + percpu_ref_exit(&mddev->writes_pending); + mddev_free(mddev); +} + +const struct block_device_operations md_fops = +{ + .owner = THIS_MODULE, + .submit_bio = md_submit_bio, + .open = md_open, + .release = md_release, + .ioctl = md_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = md_compat_ioctl, +#endif + .getgeo = md_getgeo, + .check_events = md_check_events, + .set_read_only = md_set_read_only, + .free_disk = md_free_disk, +}; + +static int md_thread(void *arg) +{ + struct md_thread *thread = arg; + + /* + * md_thread is a 'system-thread', it's priority should be very + * high. We avoid resource deadlocks individually in each + * raid personality. (RAID5 does preallocation) We also use RR and + * the very same RT priority as kswapd, thus we will never get + * into a priority inversion deadlock. + * + * we definitely have to have equal or higher priority than + * bdflush, otherwise bdflush will deadlock if there are too + * many dirty RAID5 blocks. + */ + + allow_signal(SIGKILL); + while (!kthread_should_stop()) { + + /* We need to wait INTERRUPTIBLE so that + * we don't add to the load-average. + * That means we need to be sure no signals are + * pending + */ + if (signal_pending(current)) + flush_signals(current); + + wait_event_interruptible_timeout + (thread->wqueue, + test_bit(THREAD_WAKEUP, &thread->flags) + || kthread_should_stop() || kthread_should_park(), + thread->timeout); + + clear_bit(THREAD_WAKEUP, &thread->flags); + if (kthread_should_park()) + kthread_parkme(); + if (!kthread_should_stop()) + thread->run(thread); + } + + return 0; +} + +static void md_wakeup_thread_directly(struct md_thread __rcu *thread) +{ + struct md_thread *t; + + rcu_read_lock(); + t = rcu_dereference(thread); + if (t) + wake_up_process(t->tsk); + rcu_read_unlock(); +} + +void md_wakeup_thread(struct md_thread __rcu *thread) +{ + struct md_thread *t; + + rcu_read_lock(); + t = rcu_dereference(thread); + if (t) { + pr_debug("md: waking up MD thread %s.\n", t->tsk->comm); + set_bit(THREAD_WAKEUP, &t->flags); + wake_up(&t->wqueue); + } + rcu_read_unlock(); +} +EXPORT_SYMBOL(md_wakeup_thread); + +struct md_thread *md_register_thread(void (*run) (struct md_thread *), + struct mddev *mddev, const char *name) +{ + struct md_thread *thread; + + thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL); + if (!thread) + return NULL; + + init_waitqueue_head(&thread->wqueue); + + thread->run = run; + thread->mddev = mddev; + thread->timeout = MAX_SCHEDULE_TIMEOUT; + thread->tsk = kthread_run(md_thread, thread, + "%s_%s", + mdname(thread->mddev), + name); + if (IS_ERR(thread->tsk)) { + kfree(thread); + return NULL; + } + return thread; +} +EXPORT_SYMBOL(md_register_thread); + +void md_unregister_thread(struct mddev *mddev, struct md_thread __rcu **threadp) +{ + struct md_thread *thread = rcu_dereference_protected(*threadp, + lockdep_is_held(&mddev->reconfig_mutex)); + + if (!thread) + return; + + rcu_assign_pointer(*threadp, NULL); + synchronize_rcu(); + + pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); + kthread_stop(thread->tsk); + kfree(thread); +} +EXPORT_SYMBOL(md_unregister_thread); + +void md_error(struct mddev *mddev, struct md_rdev *rdev) +{ + if (!rdev || test_bit(Faulty, &rdev->flags)) + return; + + if (!mddev->pers || !mddev->pers->error_handler) + return; + mddev->pers->error_handler(mddev, rdev); + + if (mddev->pers->level == 0 || mddev->pers->level == LEVEL_LINEAR) + return; + + if (mddev->degraded && !test_bit(MD_BROKEN, &mddev->flags)) + set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); + sysfs_notify_dirent_safe(rdev->sysfs_state); + set_bit(MD_RECOVERY_INTR, &mddev->recovery); + if (!test_bit(MD_BROKEN, &mddev->flags)) { + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + md_wakeup_thread(mddev->thread); + } + if (mddev->event_work.func) + queue_work(md_misc_wq, &mddev->event_work); + md_new_event(); +} +EXPORT_SYMBOL(md_error); + +/* seq_file implementation /proc/mdstat */ + +static void status_unused(struct seq_file *seq) +{ + int i = 0; + struct md_rdev *rdev; + + seq_printf(seq, "unused devices: "); + + list_for_each_entry(rdev, &pending_raid_disks, same_set) { + i++; + seq_printf(seq, "%pg ", rdev->bdev); + } + if (!i) + seq_printf(seq, "<none>"); + + seq_printf(seq, "\n"); +} + +static int status_resync(struct seq_file *seq, struct mddev *mddev) +{ + sector_t max_sectors, resync, res; + unsigned long dt, db = 0; + sector_t rt, curr_mark_cnt, resync_mark_cnt; + int scale, recovery_active; + unsigned int per_milli; + + if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || + test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) + max_sectors = mddev->resync_max_sectors; + else + max_sectors = mddev->dev_sectors; + + resync = mddev->curr_resync; + if (resync < MD_RESYNC_ACTIVE) { + if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) + /* Still cleaning up */ + resync = max_sectors; + } else if (resync > max_sectors) { + resync = max_sectors; + } else { + res = atomic_read(&mddev->recovery_active); + /* + * Resync has started, but the subtraction has overflowed or + * yielded one of the special values. Force it to active to + * ensure the status reports an active resync. + */ + if (resync < res || resync - res < MD_RESYNC_ACTIVE) + resync = MD_RESYNC_ACTIVE; + else + resync -= res; + } + + if (resync == MD_RESYNC_NONE) { + if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery)) { + struct md_rdev *rdev; + + rdev_for_each(rdev, mddev) + if (rdev->raid_disk >= 0 && + !test_bit(Faulty, &rdev->flags) && + rdev->recovery_offset != MaxSector && + rdev->recovery_offset) { + seq_printf(seq, "\trecover=REMOTE"); + return 1; + } + if (mddev->reshape_position != MaxSector) + seq_printf(seq, "\treshape=REMOTE"); + else + seq_printf(seq, "\tresync=REMOTE"); + return 1; + } + if (mddev->recovery_cp < MaxSector) { + seq_printf(seq, "\tresync=PENDING"); + return 1; + } + return 0; + } + if (resync < MD_RESYNC_ACTIVE) { + seq_printf(seq, "\tresync=DELAYED"); + return 1; + } + + WARN_ON(max_sectors == 0); + /* Pick 'scale' such that (resync>>scale)*1000 will fit + * in a sector_t, and (max_sectors>>scale) will fit in a + * u32, as those are the requirements for sector_div. + * Thus 'scale' must be at least 10 + */ + scale = 10; + if (sizeof(sector_t) > sizeof(unsigned long)) { + while ( max_sectors/2 > (1ULL<<(scale+32))) + scale++; + } + res = (resync>>scale)*1000; + sector_div(res, (u32)((max_sectors>>scale)+1)); + + per_milli = res; + { + int i, x = per_milli/50, y = 20-x; + seq_printf(seq, "["); + for (i = 0; i < x; i++) + seq_printf(seq, "="); + seq_printf(seq, ">"); + for (i = 0; i < y; i++) + seq_printf(seq, "."); + seq_printf(seq, "] "); + } + seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", + (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? + "reshape" : + (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? + "check" : + (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? + "resync" : "recovery"))), + per_milli/10, per_milli % 10, + (unsigned long long) resync/2, + (unsigned long long) max_sectors/2); + + /* + * dt: time from mark until now + * db: blocks written from mark until now + * rt: remaining time + * + * rt is a sector_t, which is always 64bit now. We are keeping + * the original algorithm, but it is not really necessary. + * + * Original algorithm: + * So we divide before multiply in case it is 32bit and close + * to the limit. + * We scale the divisor (db) by 32 to avoid losing precision + * near the end of resync when the number of remaining sectors + * is close to 'db'. + * We then divide rt by 32 after multiplying by db to compensate. + * The '+1' avoids division by zero if db is very small. + */ + dt = ((jiffies - mddev->resync_mark) / HZ); + if (!dt) dt++; + + curr_mark_cnt = mddev->curr_mark_cnt; + recovery_active = atomic_read(&mddev->recovery_active); + resync_mark_cnt = mddev->resync_mark_cnt; + + if (curr_mark_cnt >= (recovery_active + resync_mark_cnt)) + db = curr_mark_cnt - (recovery_active + resync_mark_cnt); + + rt = max_sectors - resync; /* number of remaining sectors */ + rt = div64_u64(rt, db/32+1); + rt *= dt; + rt >>= 5; + + seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, + ((unsigned long)rt % 60)/6); + + seq_printf(seq, " speed=%ldK/sec", db/2/dt); + return 1; +} + +static void *md_seq_start(struct seq_file *seq, loff_t *pos) +{ + struct list_head *tmp; + loff_t l = *pos; + struct mddev *mddev; + + if (l == 0x10000) { + ++*pos; + return (void *)2; + } + if (l > 0x10000) + return NULL; + if (!l--) + /* header */ + return (void*)1; + + spin_lock(&all_mddevs_lock); + list_for_each(tmp,&all_mddevs) + if (!l--) { + mddev = list_entry(tmp, struct mddev, all_mddevs); + if (!mddev_get(mddev)) + continue; + spin_unlock(&all_mddevs_lock); + return mddev; + } + spin_unlock(&all_mddevs_lock); + if (!l--) + return (void*)2;/* tail */ + return NULL; +} + +static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) +{ + struct list_head *tmp; + struct mddev *next_mddev, *mddev = v; + struct mddev *to_put = NULL; + + ++*pos; + if (v == (void*)2) + return NULL; + + spin_lock(&all_mddevs_lock); + if (v == (void*)1) { + tmp = all_mddevs.next; + } else { + to_put = mddev; + tmp = mddev->all_mddevs.next; + } + + for (;;) { + if (tmp == &all_mddevs) { + next_mddev = (void*)2; + *pos = 0x10000; + break; + } + next_mddev = list_entry(tmp, struct mddev, all_mddevs); + if (mddev_get(next_mddev)) + break; + mddev = next_mddev; + tmp = mddev->all_mddevs.next; + } + spin_unlock(&all_mddevs_lock); + + if (to_put) + mddev_put(to_put); + return next_mddev; + +} + +static void md_seq_stop(struct seq_file *seq, void *v) +{ + struct mddev *mddev = v; + + if (mddev && v != (void*)1 && v != (void*)2) + mddev_put(mddev); +} + +static int md_seq_show(struct seq_file *seq, void *v) +{ + struct mddev *mddev = v; + sector_t sectors; + struct md_rdev *rdev; + + if (v == (void*)1) { + struct md_personality *pers; + seq_printf(seq, "Personalities : "); + spin_lock(&pers_lock); + list_for_each_entry(pers, &pers_list, list) + seq_printf(seq, "[%s] ", pers->name); + + spin_unlock(&pers_lock); + seq_printf(seq, "\n"); + seq->poll_event = atomic_read(&md_event_count); + return 0; + } + if (v == (void*)2) { + status_unused(seq); + return 0; + } + + spin_lock(&mddev->lock); + if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { + seq_printf(seq, "%s : %sactive", mdname(mddev), + mddev->pers ? "" : "in"); + if (mddev->pers) { + if (mddev->ro == MD_RDONLY) + seq_printf(seq, " (read-only)"); + if (mddev->ro == MD_AUTO_READ) + seq_printf(seq, " (auto-read-only)"); + seq_printf(seq, " %s", mddev->pers->name); + } + + sectors = 0; + rcu_read_lock(); + rdev_for_each_rcu(rdev, mddev) { + seq_printf(seq, " %pg[%d]", rdev->bdev, rdev->desc_nr); + + if (test_bit(WriteMostly, &rdev->flags)) + seq_printf(seq, "(W)"); + if (test_bit(Journal, &rdev->flags)) + seq_printf(seq, "(J)"); + if (test_bit(Faulty, &rdev->flags)) { + seq_printf(seq, "(F)"); + continue; + } + if (rdev->raid_disk < 0) + seq_printf(seq, "(S)"); /* spare */ + if (test_bit(Replacement, &rdev->flags)) + seq_printf(seq, "(R)"); + sectors += rdev->sectors; + } + rcu_read_unlock(); + + if (!list_empty(&mddev->disks)) { + if (mddev->pers) + seq_printf(seq, "\n %llu blocks", + (unsigned long long) + mddev->array_sectors / 2); + else + seq_printf(seq, "\n %llu blocks", + (unsigned long long)sectors / 2); + } + if (mddev->persistent) { + if (mddev->major_version != 0 || + mddev->minor_version != 90) { + seq_printf(seq," super %d.%d", + mddev->major_version, + mddev->minor_version); + } + } else if (mddev->external) + seq_printf(seq, " super external:%s", + mddev->metadata_type); + else + seq_printf(seq, " super non-persistent"); + + if (mddev->pers) { + mddev->pers->status(seq, mddev); + seq_printf(seq, "\n "); + if (mddev->pers->sync_request) { + if (status_resync(seq, mddev)) + seq_printf(seq, "\n "); + } + } else + seq_printf(seq, "\n "); + + md_bitmap_status(seq, mddev->bitmap); + + seq_printf(seq, "\n"); + } + spin_unlock(&mddev->lock); + + return 0; +} + +static const struct seq_operations md_seq_ops = { + .start = md_seq_start, + .next = md_seq_next, + .stop = md_seq_stop, + .show = md_seq_show, +}; + +static int md_seq_open(struct inode *inode, struct file *file) +{ + struct seq_file *seq; + int error; + + error = seq_open(file, &md_seq_ops); + if (error) + return error; + + seq = file->private_data; + seq->poll_event = atomic_read(&md_event_count); + return error; +} + +static int md_unloading; +static __poll_t mdstat_poll(struct file *filp, poll_table *wait) +{ + struct seq_file *seq = filp->private_data; + __poll_t mask; + + if (md_unloading) + return EPOLLIN|EPOLLRDNORM|EPOLLERR|EPOLLPRI; + poll_wait(filp, &md_event_waiters, wait); + + /* always allow read */ + mask = EPOLLIN | EPOLLRDNORM; + + if (seq->poll_event != atomic_read(&md_event_count)) + mask |= EPOLLERR | EPOLLPRI; + return mask; +} + +static const struct proc_ops mdstat_proc_ops = { + .proc_open = md_seq_open, + .proc_read = seq_read, + .proc_lseek = seq_lseek, + .proc_release = seq_release, + .proc_poll = mdstat_poll, +}; + +int register_md_personality(struct md_personality *p) +{ + pr_debug("md: %s personality registered for level %d\n", + p->name, p->level); + spin_lock(&pers_lock); + list_add_tail(&p->list, &pers_list); + spin_unlock(&pers_lock); + return 0; +} +EXPORT_SYMBOL(register_md_personality); + +int unregister_md_personality(struct md_personality *p) +{ + pr_debug("md: %s personality unregistered\n", p->name); + spin_lock(&pers_lock); + list_del_init(&p->list); + spin_unlock(&pers_lock); + return 0; +} +EXPORT_SYMBOL(unregister_md_personality); + +int register_md_cluster_operations(struct md_cluster_operations *ops, + struct module *module) +{ + int ret = 0; + spin_lock(&pers_lock); + if (md_cluster_ops != NULL) + ret = -EALREADY; + else { + md_cluster_ops = ops; + md_cluster_mod = module; + } + spin_unlock(&pers_lock); + return ret; +} +EXPORT_SYMBOL(register_md_cluster_operations); + +int unregister_md_cluster_operations(void) +{ + spin_lock(&pers_lock); + md_cluster_ops = NULL; + spin_unlock(&pers_lock); + return 0; +} +EXPORT_SYMBOL(unregister_md_cluster_operations); + +int md_setup_cluster(struct mddev *mddev, int nodes) +{ + int ret; + if (!md_cluster_ops) + request_module("md-cluster"); + spin_lock(&pers_lock); + /* ensure module won't be unloaded */ + if (!md_cluster_ops || !try_module_get(md_cluster_mod)) { + pr_warn("can't find md-cluster module or get its reference.\n"); + spin_unlock(&pers_lock); + return -ENOENT; + } + spin_unlock(&pers_lock); + + ret = md_cluster_ops->join(mddev, nodes); + if (!ret) + mddev->safemode_delay = 0; + return ret; +} + +void md_cluster_stop(struct mddev *mddev) +{ + if (!md_cluster_ops) + return; + md_cluster_ops->leave(mddev); + module_put(md_cluster_mod); +} + +static int is_mddev_idle(struct mddev *mddev, int init) +{ + struct md_rdev *rdev; + int idle; + int curr_events; + + idle = 1; + rcu_read_lock(); + rdev_for_each_rcu(rdev, mddev) { + struct gendisk *disk = rdev->bdev->bd_disk; + curr_events = (int)part_stat_read_accum(disk->part0, sectors) - + atomic_read(&disk->sync_io); + /* sync IO will cause sync_io to increase before the disk_stats + * as sync_io is counted when a request starts, and + * disk_stats is counted when it completes. + * So resync activity will cause curr_events to be smaller than + * when there was no such activity. + * non-sync IO will cause disk_stat to increase without + * increasing sync_io so curr_events will (eventually) + * be larger than it was before. Once it becomes + * substantially larger, the test below will cause + * the array to appear non-idle, and resync will slow + * down. + * If there is a lot of outstanding resync activity when + * we set last_event to curr_events, then all that activity + * completing might cause the array to appear non-idle + * and resync will be slowed down even though there might + * not have been non-resync activity. This will only + * happen once though. 'last_events' will soon reflect + * the state where there is little or no outstanding + * resync requests, and further resync activity will + * always make curr_events less than last_events. + * + */ + if (init || curr_events - rdev->last_events > 64) { + rdev->last_events = curr_events; + idle = 0; + } + } + rcu_read_unlock(); + return idle; +} + +void md_done_sync(struct mddev *mddev, int blocks, int ok) +{ + /* another "blocks" (512byte) blocks have been synced */ + atomic_sub(blocks, &mddev->recovery_active); + wake_up(&mddev->recovery_wait); + if (!ok) { + set_bit(MD_RECOVERY_INTR, &mddev->recovery); + set_bit(MD_RECOVERY_ERROR, &mddev->recovery); + md_wakeup_thread(mddev->thread); + // stop recovery, signal do_sync .... + } +} +EXPORT_SYMBOL(md_done_sync); + +/* md_write_start(mddev, bi) + * If we need to update some array metadata (e.g. 'active' flag + * in superblock) before writing, schedule a superblock update + * and wait for it to complete. + * A return value of 'false' means that the write wasn't recorded + * and cannot proceed as the array is being suspend. + */ +bool md_write_start(struct mddev *mddev, struct bio *bi) +{ + int did_change = 0; + + if (bio_data_dir(bi) != WRITE) + return true; + + BUG_ON(mddev->ro == MD_RDONLY); + if (mddev->ro == MD_AUTO_READ) { + /* need to switch to read/write */ + mddev->ro = MD_RDWR; + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + md_wakeup_thread(mddev->thread); + md_wakeup_thread(mddev->sync_thread); + did_change = 1; + } + rcu_read_lock(); + percpu_ref_get(&mddev->writes_pending); + smp_mb(); /* Match smp_mb in set_in_sync() */ + if (mddev->safemode == 1) + mddev->safemode = 0; + /* sync_checkers is always 0 when writes_pending is in per-cpu mode */ + if (mddev->in_sync || mddev->sync_checkers) { + spin_lock(&mddev->lock); + if (mddev->in_sync) { + mddev->in_sync = 0; + set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); + set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); + md_wakeup_thread(mddev->thread); + did_change = 1; + } + spin_unlock(&mddev->lock); + } + rcu_read_unlock(); + if (did_change) + sysfs_notify_dirent_safe(mddev->sysfs_state); + if (!mddev->has_superblocks) + return true; + wait_event(mddev->sb_wait, + !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) || + is_md_suspended(mddev)); + if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) { + percpu_ref_put(&mddev->writes_pending); + return false; + } + return true; +} +EXPORT_SYMBOL(md_write_start); + +/* md_write_inc can only be called when md_write_start() has + * already been called at least once of the current request. + * It increments the counter and is useful when a single request + * is split into several parts. Each part causes an increment and + * so needs a matching md_write_end(). + * Unlike md_write_start(), it is safe to call md_write_inc() inside + * a spinlocked region. + */ +void md_write_inc(struct mddev *mddev, struct bio *bi) +{ + if (bio_data_dir(bi) != WRITE) + return; + WARN_ON_ONCE(mddev->in_sync || !md_is_rdwr(mddev)); + percpu_ref_get(&mddev->writes_pending); +} +EXPORT_SYMBOL(md_write_inc); + +void md_write_end(struct mddev *mddev) +{ + percpu_ref_put(&mddev->writes_pending); + + if (mddev->safemode == 2) + md_wakeup_thread(mddev->thread); + else if (mddev->safemode_delay) + /* The roundup() ensures this only performs locking once + * every ->safemode_delay jiffies + */ + mod_timer(&mddev->safemode_timer, + roundup(jiffies, mddev->safemode_delay) + + mddev->safemode_delay); +} + +EXPORT_SYMBOL(md_write_end); + +/* This is used by raid0 and raid10 */ +void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev, + struct bio *bio, sector_t start, sector_t size) +{ + struct bio *discard_bio = NULL; + + if (__blkdev_issue_discard(rdev->bdev, start, size, GFP_NOIO, + &discard_bio) || !discard_bio) + return; + + bio_chain(discard_bio, bio); + bio_clone_blkg_association(discard_bio, bio); + if (mddev->gendisk) + trace_block_bio_remap(discard_bio, + disk_devt(mddev->gendisk), + bio->bi_iter.bi_sector); + submit_bio_noacct(discard_bio); +} +EXPORT_SYMBOL_GPL(md_submit_discard_bio); + +static void md_end_clone_io(struct bio *bio) +{ + struct md_io_clone *md_io_clone = bio->bi_private; + struct bio *orig_bio = md_io_clone->orig_bio; + struct mddev *mddev = md_io_clone->mddev; + + if (bio->bi_status && !orig_bio->bi_status) + orig_bio->bi_status = bio->bi_status; + + if (md_io_clone->start_time) + bio_end_io_acct(orig_bio, md_io_clone->start_time); + + bio_put(bio); + bio_endio(orig_bio); + percpu_ref_put(&mddev->active_io); +} + +static void md_clone_bio(struct mddev *mddev, struct bio **bio) +{ + struct block_device *bdev = (*bio)->bi_bdev; + struct md_io_clone *md_io_clone; + struct bio *clone = + bio_alloc_clone(bdev, *bio, GFP_NOIO, &mddev->io_clone_set); + + md_io_clone = container_of(clone, struct md_io_clone, bio_clone); + md_io_clone->orig_bio = *bio; + md_io_clone->mddev = mddev; + if (blk_queue_io_stat(bdev->bd_disk->queue)) + md_io_clone->start_time = bio_start_io_acct(*bio); + + clone->bi_end_io = md_end_clone_io; + clone->bi_private = md_io_clone; + *bio = clone; +} + +void md_account_bio(struct mddev *mddev, struct bio **bio) +{ + percpu_ref_get(&mddev->active_io); + md_clone_bio(mddev, bio); +} +EXPORT_SYMBOL_GPL(md_account_bio); + +/* md_allow_write(mddev) + * Calling this ensures that the array is marked 'active' so that writes + * may proceed without blocking. It is important to call this before + * attempting a GFP_KERNEL allocation while holding the mddev lock. + * Must be called with mddev_lock held. + */ +void md_allow_write(struct mddev *mddev) +{ + if (!mddev->pers) + return; + if (!md_is_rdwr(mddev)) + return; + if (!mddev->pers->sync_request) + return; + + spin_lock(&mddev->lock); + if (mddev->in_sync) { + mddev->in_sync = 0; + set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); + set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); + if (mddev->safemode_delay && + mddev->safemode == 0) + mddev->safemode = 1; + spin_unlock(&mddev->lock); + md_update_sb(mddev, 0); + sysfs_notify_dirent_safe(mddev->sysfs_state); + /* wait for the dirty state to be recorded in the metadata */ + wait_event(mddev->sb_wait, + !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)); + } else + spin_unlock(&mddev->lock); +} +EXPORT_SYMBOL_GPL(md_allow_write); + +#define SYNC_MARKS 10 +#define SYNC_MARK_STEP (3*HZ) +#define UPDATE_FREQUENCY (5*60*HZ) +void md_do_sync(struct md_thread *thread) +{ + struct mddev *mddev = thread->mddev; + struct mddev *mddev2; + unsigned int currspeed = 0, window; + sector_t max_sectors,j, io_sectors, recovery_done; + unsigned long mark[SYNC_MARKS]; + unsigned long update_time; + sector_t mark_cnt[SYNC_MARKS]; + int last_mark,m; + sector_t last_check; + int skipped = 0; + struct md_rdev *rdev; + char *desc, *action = NULL; + struct blk_plug plug; + int ret; + + /* just incase thread restarts... */ + if (test_bit(MD_RECOVERY_DONE, &mddev->recovery) || + test_bit(MD_RECOVERY_WAIT, &mddev->recovery)) + return; + if (!md_is_rdwr(mddev)) {/* never try to sync a read-only array */ + set_bit(MD_RECOVERY_INTR, &mddev->recovery); + return; + } + + if (mddev_is_clustered(mddev)) { + ret = md_cluster_ops->resync_start(mddev); + if (ret) + goto skip; + + set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags); + if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || + test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) || + test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) + && ((unsigned long long)mddev->curr_resync_completed + < (unsigned long long)mddev->resync_max_sectors)) + goto skip; + } + + if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { + if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { + desc = "data-check"; + action = "check"; + } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { + desc = "requested-resync"; + action = "repair"; + } else + desc = "resync"; + } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) + desc = "reshape"; + else + desc = "recovery"; + + mddev->last_sync_action = action ?: desc; + + /* + * Before starting a resync we must have set curr_resync to + * 2, and then checked that every "conflicting" array has curr_resync + * less than ours. When we find one that is the same or higher + * we wait on resync_wait. To avoid deadlock, we reduce curr_resync + * to 1 if we choose to yield (based arbitrarily on address of mddev structure). + * This will mean we have to start checking from the beginning again. + * + */ + + do { + int mddev2_minor = -1; + mddev->curr_resync = MD_RESYNC_DELAYED; + + try_again: + if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) + goto skip; + spin_lock(&all_mddevs_lock); + list_for_each_entry(mddev2, &all_mddevs, all_mddevs) { + if (test_bit(MD_DELETED, &mddev2->flags)) + continue; + if (mddev2 == mddev) + continue; + if (!mddev->parallel_resync + && mddev2->curr_resync + && match_mddev_units(mddev, mddev2)) { + DEFINE_WAIT(wq); + if (mddev < mddev2 && + mddev->curr_resync == MD_RESYNC_DELAYED) { + /* arbitrarily yield */ + mddev->curr_resync = MD_RESYNC_YIELDED; + wake_up(&resync_wait); + } + if (mddev > mddev2 && + mddev->curr_resync == MD_RESYNC_YIELDED) + /* no need to wait here, we can wait the next + * time 'round when curr_resync == 2 + */ + continue; + /* We need to wait 'interruptible' so as not to + * contribute to the load average, and not to + * be caught by 'softlockup' + */ + prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); + if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && + mddev2->curr_resync >= mddev->curr_resync) { + if (mddev2_minor != mddev2->md_minor) { + mddev2_minor = mddev2->md_minor; + pr_info("md: delaying %s of %s until %s has finished (they share one or more physical units)\n", + desc, mdname(mddev), + mdname(mddev2)); + } + spin_unlock(&all_mddevs_lock); + + if (signal_pending(current)) + flush_signals(current); + schedule(); + finish_wait(&resync_wait, &wq); + goto try_again; + } + finish_wait(&resync_wait, &wq); + } + } + spin_unlock(&all_mddevs_lock); + } while (mddev->curr_resync < MD_RESYNC_DELAYED); + + j = 0; + if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { + /* resync follows the size requested by the personality, + * which defaults to physical size, but can be virtual size + */ + max_sectors = mddev->resync_max_sectors; + atomic64_set(&mddev->resync_mismatches, 0); + /* we don't use the checkpoint if there's a bitmap */ + if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) + j = mddev->resync_min; + else if (!mddev->bitmap) + j = mddev->recovery_cp; + + } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) { + max_sectors = mddev->resync_max_sectors; + /* + * If the original node aborts reshaping then we continue the + * reshaping, so set j again to avoid restart reshape from the + * first beginning + */ + if (mddev_is_clustered(mddev) && + mddev->reshape_position != MaxSector) + j = mddev->reshape_position; + } else { + /* recovery follows the physical size of devices */ + max_sectors = mddev->dev_sectors; + j = MaxSector; + rcu_read_lock(); + rdev_for_each_rcu(rdev, mddev) + if (rdev->raid_disk >= 0 && + !test_bit(Journal, &rdev->flags) && + !test_bit(Faulty, &rdev->flags) && + !test_bit(In_sync, &rdev->flags) && + rdev->recovery_offset < j) + j = rdev->recovery_offset; + rcu_read_unlock(); + + /* If there is a bitmap, we need to make sure all + * writes that started before we added a spare + * complete before we start doing a recovery. + * Otherwise the write might complete and (via + * bitmap_endwrite) set a bit in the bitmap after the + * recovery has checked that bit and skipped that + * region. + */ + if (mddev->bitmap) { + mddev->pers->quiesce(mddev, 1); + mddev->pers->quiesce(mddev, 0); + } + } + + pr_info("md: %s of RAID array %s\n", desc, mdname(mddev)); + pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev)); + pr_debug("md: using maximum available idle IO bandwidth (but not more than %d KB/sec) for %s.\n", + speed_max(mddev), desc); + + is_mddev_idle(mddev, 1); /* this initializes IO event counters */ + + io_sectors = 0; + for (m = 0; m < SYNC_MARKS; m++) { + mark[m] = jiffies; + mark_cnt[m] = io_sectors; + } + last_mark = 0; + mddev->resync_mark = mark[last_mark]; + mddev->resync_mark_cnt = mark_cnt[last_mark]; + + /* + * Tune reconstruction: + */ + window = 32 * (PAGE_SIZE / 512); + pr_debug("md: using %dk window, over a total of %lluk.\n", + window/2, (unsigned long long)max_sectors/2); + + atomic_set(&mddev->recovery_active, 0); + last_check = 0; + + if (j >= MD_RESYNC_ACTIVE) { + pr_debug("md: resuming %s of %s from checkpoint.\n", + desc, mdname(mddev)); + mddev->curr_resync = j; + } else + mddev->curr_resync = MD_RESYNC_ACTIVE; /* no longer delayed */ + mddev->curr_resync_completed = j; + sysfs_notify_dirent_safe(mddev->sysfs_completed); + md_new_event(); + update_time = jiffies; + + blk_start_plug(&plug); + while (j < max_sectors) { + sector_t sectors; + + skipped = 0; + + if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && + ((mddev->curr_resync > mddev->curr_resync_completed && + (mddev->curr_resync - mddev->curr_resync_completed) + > (max_sectors >> 4)) || + time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) || + (j - mddev->curr_resync_completed)*2 + >= mddev->resync_max - mddev->curr_resync_completed || + mddev->curr_resync_completed > mddev->resync_max + )) { + /* time to update curr_resync_completed */ + wait_event(mddev->recovery_wait, + atomic_read(&mddev->recovery_active) == 0); + mddev->curr_resync_completed = j; + if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && + j > mddev->recovery_cp) + mddev->recovery_cp = j; + update_time = jiffies; + set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); + sysfs_notify_dirent_safe(mddev->sysfs_completed); + } + + while (j >= mddev->resync_max && + !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { + /* As this condition is controlled by user-space, + * we can block indefinitely, so use '_interruptible' + * to avoid triggering warnings. + */ + flush_signals(current); /* just in case */ + wait_event_interruptible(mddev->recovery_wait, + mddev->resync_max > j + || test_bit(MD_RECOVERY_INTR, + &mddev->recovery)); + } + + if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) + break; + + sectors = mddev->pers->sync_request(mddev, j, &skipped); + if (sectors == 0) { + set_bit(MD_RECOVERY_INTR, &mddev->recovery); + break; + } + + if (!skipped) { /* actual IO requested */ + io_sectors += sectors; + atomic_add(sectors, &mddev->recovery_active); + } + + if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) + break; + + j += sectors; + if (j > max_sectors) + /* when skipping, extra large numbers can be returned. */ + j = max_sectors; + if (j >= MD_RESYNC_ACTIVE) + mddev->curr_resync = j; + mddev->curr_mark_cnt = io_sectors; + if (last_check == 0) + /* this is the earliest that rebuild will be + * visible in /proc/mdstat + */ + md_new_event(); + + if (last_check + window > io_sectors || j == max_sectors) + continue; + + last_check = io_sectors; + repeat: + if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { + /* step marks */ + int next = (last_mark+1) % SYNC_MARKS; + + mddev->resync_mark = mark[next]; + mddev->resync_mark_cnt = mark_cnt[next]; + mark[next] = jiffies; + mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); + last_mark = next; + } + + if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) + break; + + /* + * this loop exits only if either when we are slower than + * the 'hard' speed limit, or the system was IO-idle for + * a jiffy. + * the system might be non-idle CPU-wise, but we only care + * about not overloading the IO subsystem. (things like an + * e2fsck being done on the RAID array should execute fast) + */ + cond_resched(); + + recovery_done = io_sectors - atomic_read(&mddev->recovery_active); + currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2 + /((jiffies-mddev->resync_mark)/HZ +1) +1; + + if (currspeed > speed_min(mddev)) { + if (currspeed > speed_max(mddev)) { + msleep(500); + goto repeat; + } + if (!is_mddev_idle(mddev, 0)) { + /* + * Give other IO more of a chance. + * The faster the devices, the less we wait. + */ + wait_event(mddev->recovery_wait, + !atomic_read(&mddev->recovery_active)); + } + } + } + pr_info("md: %s: %s %s.\n",mdname(mddev), desc, + test_bit(MD_RECOVERY_INTR, &mddev->recovery) + ? "interrupted" : "done"); + /* + * this also signals 'finished resyncing' to md_stop + */ + blk_finish_plug(&plug); + wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); + + if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && + !test_bit(MD_RECOVERY_INTR, &mddev->recovery) && + mddev->curr_resync >= MD_RESYNC_ACTIVE) { + mddev->curr_resync_completed = mddev->curr_resync; + sysfs_notify_dirent_safe(mddev->sysfs_completed); + } + mddev->pers->sync_request(mddev, max_sectors, &skipped); + + if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && + mddev->curr_resync > MD_RESYNC_ACTIVE) { + if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { + if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { + if (mddev->curr_resync >= mddev->recovery_cp) { + pr_debug("md: checkpointing %s of %s.\n", + desc, mdname(mddev)); + if (test_bit(MD_RECOVERY_ERROR, + &mddev->recovery)) + mddev->recovery_cp = + mddev->curr_resync_completed; + else + mddev->recovery_cp = + mddev->curr_resync; + } + } else + mddev->recovery_cp = MaxSector; + } else { + if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) + mddev->curr_resync = MaxSector; + if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && + test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) { + rcu_read_lock(); + rdev_for_each_rcu(rdev, mddev) + if (rdev->raid_disk >= 0 && + mddev->delta_disks >= 0 && + !test_bit(Journal, &rdev->flags) && + !test_bit(Faulty, &rdev->flags) && + !test_bit(In_sync, &rdev->flags) && + rdev->recovery_offset < mddev->curr_resync) + rdev->recovery_offset = mddev->curr_resync; + rcu_read_unlock(); + } + } + } + skip: + /* set CHANGE_PENDING here since maybe another update is needed, + * so other nodes are informed. It should be harmless for normal + * raid */ + set_mask_bits(&mddev->sb_flags, 0, + BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS)); + + if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && + !test_bit(MD_RECOVERY_INTR, &mddev->recovery) && + mddev->delta_disks > 0 && + mddev->pers->finish_reshape && + mddev->pers->size && + mddev->queue) { + mddev_lock_nointr(mddev); + md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0)); + mddev_unlock(mddev); + if (!mddev_is_clustered(mddev)) + set_capacity_and_notify(mddev->gendisk, + mddev->array_sectors); + } + + spin_lock(&mddev->lock); + if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { + /* We completed so min/max setting can be forgotten if used. */ + if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) + mddev->resync_min = 0; + mddev->resync_max = MaxSector; + } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) + mddev->resync_min = mddev->curr_resync_completed; + set_bit(MD_RECOVERY_DONE, &mddev->recovery); + mddev->curr_resync = MD_RESYNC_NONE; + spin_unlock(&mddev->lock); + + wake_up(&resync_wait); + wake_up(&mddev->sb_wait); + md_wakeup_thread(mddev->thread); + return; +} +EXPORT_SYMBOL_GPL(md_do_sync); + +static int remove_and_add_spares(struct mddev *mddev, + struct md_rdev *this) +{ + struct md_rdev *rdev; + int spares = 0; + int removed = 0; + bool remove_some = false; + + if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) + /* Mustn't remove devices when resync thread is running */ + return 0; + + rdev_for_each(rdev, mddev) { + if ((this == NULL || rdev == this) && + rdev->raid_disk >= 0 && + !test_bit(Blocked, &rdev->flags) && + test_bit(Faulty, &rdev->flags) && + atomic_read(&rdev->nr_pending)==0) { + /* Faulty non-Blocked devices with nr_pending == 0 + * never get nr_pending incremented, + * never get Faulty cleared, and never get Blocked set. + * So we can synchronize_rcu now rather than once per device + */ + remove_some = true; + set_bit(RemoveSynchronized, &rdev->flags); + } + } + + if (remove_some) + synchronize_rcu(); + rdev_for_each(rdev, mddev) { + if ((this == NULL || rdev == this) && + rdev->raid_disk >= 0 && + !test_bit(Blocked, &rdev->flags) && + ((test_bit(RemoveSynchronized, &rdev->flags) || + (!test_bit(In_sync, &rdev->flags) && + !test_bit(Journal, &rdev->flags))) && + atomic_read(&rdev->nr_pending)==0)) { + if (mddev->pers->hot_remove_disk( + mddev, rdev) == 0) { + sysfs_unlink_rdev(mddev, rdev); + rdev->saved_raid_disk = rdev->raid_disk; + rdev->raid_disk = -1; + removed++; + } + } + if (remove_some && test_bit(RemoveSynchronized, &rdev->flags)) + clear_bit(RemoveSynchronized, &rdev->flags); + } + + if (removed && mddev->kobj.sd) + sysfs_notify_dirent_safe(mddev->sysfs_degraded); + + if (this && removed) + goto no_add; + + rdev_for_each(rdev, mddev) { + if (this && this != rdev) + continue; + if (test_bit(Candidate, &rdev->flags)) + continue; + if (rdev->raid_disk >= 0 && + !test_bit(In_sync, &rdev->flags) && + !test_bit(Journal, &rdev->flags) && + !test_bit(Faulty, &rdev->flags)) + spares++; + if (rdev->raid_disk >= 0) + continue; + if (test_bit(Faulty, &rdev->flags)) + continue; + if (!test_bit(Journal, &rdev->flags)) { + if (!md_is_rdwr(mddev) && + !(rdev->saved_raid_disk >= 0 && + !test_bit(Bitmap_sync, &rdev->flags))) + continue; + + rdev->recovery_offset = 0; + } + if (mddev->pers->hot_add_disk(mddev, rdev) == 0) { + /* failure here is OK */ + sysfs_link_rdev(mddev, rdev); + if (!test_bit(Journal, &rdev->flags)) + spares++; + md_new_event(); + set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); + } + } +no_add: + if (removed) + set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); + return spares; +} + +static void md_start_sync(struct work_struct *ws) +{ + struct mddev *mddev = container_of(ws, struct mddev, del_work); + + rcu_assign_pointer(mddev->sync_thread, + md_register_thread(md_do_sync, mddev, "resync")); + if (!mddev->sync_thread) { + pr_warn("%s: could not start resync thread...\n", + mdname(mddev)); + /* leave the spares where they are, it shouldn't hurt */ + clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); + clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); + clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); + clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); + clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); + wake_up(&resync_wait); + if (test_and_clear_bit(MD_RECOVERY_RECOVER, + &mddev->recovery)) + if (mddev->sysfs_action) + sysfs_notify_dirent_safe(mddev->sysfs_action); + } else + md_wakeup_thread(mddev->sync_thread); + sysfs_notify_dirent_safe(mddev->sysfs_action); + md_new_event(); +} + +/* + * This routine is regularly called by all per-raid-array threads to + * deal with generic issues like resync and super-block update. + * Raid personalities that don't have a thread (linear/raid0) do not + * need this as they never do any recovery or update the superblock. + * + * It does not do any resync itself, but rather "forks" off other threads + * to do that as needed. + * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in + * "->recovery" and create a thread at ->sync_thread. + * When the thread finishes it sets MD_RECOVERY_DONE + * and wakeups up this thread which will reap the thread and finish up. + * This thread also removes any faulty devices (with nr_pending == 0). + * + * The overall approach is: + * 1/ if the superblock needs updating, update it. + * 2/ If a recovery thread is running, don't do anything else. + * 3/ If recovery has finished, clean up, possibly marking spares active. + * 4/ If there are any faulty devices, remove them. + * 5/ If array is degraded, try to add spares devices + * 6/ If array has spares or is not in-sync, start a resync thread. + */ +void md_check_recovery(struct mddev *mddev) +{ + if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags) && mddev->sb_flags) { + /* Write superblock - thread that called mddev_suspend() + * holds reconfig_mutex for us. + */ + set_bit(MD_UPDATING_SB, &mddev->flags); + smp_mb__after_atomic(); + if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags)) + md_update_sb(mddev, 0); + clear_bit_unlock(MD_UPDATING_SB, &mddev->flags); + wake_up(&mddev->sb_wait); + } + + if (is_md_suspended(mddev)) + return; + + if (mddev->bitmap) + md_bitmap_daemon_work(mddev); + + if (signal_pending(current)) { + if (mddev->pers->sync_request && !mddev->external) { + pr_debug("md: %s in immediate safe mode\n", + mdname(mddev)); + mddev->safemode = 2; + } + flush_signals(current); + } + + if (!md_is_rdwr(mddev) && + !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) + return; + if ( ! ( + (mddev->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) || + test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || + test_bit(MD_RECOVERY_DONE, &mddev->recovery) || + (mddev->external == 0 && mddev->safemode == 1) || + (mddev->safemode == 2 + && !mddev->in_sync && mddev->recovery_cp == MaxSector) + )) + return; + + if (mddev_trylock(mddev)) { + int spares = 0; + bool try_set_sync = mddev->safemode != 0; + + if (!mddev->external && mddev->safemode == 1) + mddev->safemode = 0; + + if (!md_is_rdwr(mddev)) { + struct md_rdev *rdev; + if (!mddev->external && mddev->in_sync) + /* 'Blocked' flag not needed as failed devices + * will be recorded if array switched to read/write. + * Leaving it set will prevent the device + * from being removed. + */ + rdev_for_each(rdev, mddev) + clear_bit(Blocked, &rdev->flags); + /* On a read-only array we can: + * - remove failed devices + * - add already-in_sync devices if the array itself + * is in-sync. + * As we only add devices that are already in-sync, + * we can activate the spares immediately. + */ + remove_and_add_spares(mddev, NULL); + /* There is no thread, but we need to call + * ->spare_active and clear saved_raid_disk + */ + set_bit(MD_RECOVERY_INTR, &mddev->recovery); + md_reap_sync_thread(mddev); + clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); + clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); + goto unlock; + } + + if (mddev_is_clustered(mddev)) { + struct md_rdev *rdev, *tmp; + /* kick the device if another node issued a + * remove disk. + */ + rdev_for_each_safe(rdev, tmp, mddev) { + if (test_and_clear_bit(ClusterRemove, &rdev->flags) && + rdev->raid_disk < 0) + md_kick_rdev_from_array(rdev); + } + } + + if (try_set_sync && !mddev->external && !mddev->in_sync) { + spin_lock(&mddev->lock); + set_in_sync(mddev); + spin_unlock(&mddev->lock); + } + + if (mddev->sb_flags) + md_update_sb(mddev, 0); + + /* + * Never start a new sync thread if MD_RECOVERY_RUNNING is + * still set. + */ + if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) { + if (!test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { + /* resync/recovery still happening */ + clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + goto unlock; + } + + if (WARN_ON_ONCE(!mddev->sync_thread)) + goto unlock; + + md_reap_sync_thread(mddev); + goto unlock; + } + + /* Set RUNNING before clearing NEEDED to avoid + * any transients in the value of "sync_action". + */ + mddev->curr_resync_completed = 0; + spin_lock(&mddev->lock); + set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); + spin_unlock(&mddev->lock); + /* Clear some bits that don't mean anything, but + * might be left set + */ + clear_bit(MD_RECOVERY_INTR, &mddev->recovery); + clear_bit(MD_RECOVERY_DONE, &mddev->recovery); + + if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || + test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) + goto not_running; + /* no recovery is running. + * remove any failed drives, then + * add spares if possible. + * Spares are also removed and re-added, to allow + * the personality to fail the re-add. + */ + + if (mddev->reshape_position != MaxSector) { + if (mddev->pers->check_reshape == NULL || + mddev->pers->check_reshape(mddev) != 0) + /* Cannot proceed */ + goto not_running; + set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); + clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); + } else if ((spares = remove_and_add_spares(mddev, NULL))) { + clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); + clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); + clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); + set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); + } else if (mddev->recovery_cp < MaxSector) { + set_bit(MD_RECOVERY_SYNC, &mddev->recovery); + clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); + } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) + /* nothing to be done ... */ + goto not_running; + + if (mddev->pers->sync_request) { + if (spares) { + /* We are adding a device or devices to an array + * which has the bitmap stored on all devices. + * So make sure all bitmap pages get written + */ + md_bitmap_write_all(mddev->bitmap); + } + INIT_WORK(&mddev->del_work, md_start_sync); + queue_work(md_misc_wq, &mddev->del_work); + goto unlock; + } + not_running: + if (!mddev->sync_thread) { + clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); + wake_up(&resync_wait); + if (test_and_clear_bit(MD_RECOVERY_RECOVER, + &mddev->recovery)) + if (mddev->sysfs_action) + sysfs_notify_dirent_safe(mddev->sysfs_action); + } + unlock: + wake_up(&mddev->sb_wait); + mddev_unlock(mddev); + } +} +EXPORT_SYMBOL(md_check_recovery); + +void md_reap_sync_thread(struct mddev *mddev) +{ + struct md_rdev *rdev; + sector_t old_dev_sectors = mddev->dev_sectors; + bool is_reshaped = false; + + /* resync has finished, collect result */ + md_unregister_thread(mddev, &mddev->sync_thread); + atomic_inc(&mddev->sync_seq); + + if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && + !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && + mddev->degraded != mddev->raid_disks) { + /* success...*/ + /* activate any spares */ + if (mddev->pers->spare_active(mddev)) { + sysfs_notify_dirent_safe(mddev->sysfs_degraded); + set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); + } + } + if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && + mddev->pers->finish_reshape) { + mddev->pers->finish_reshape(mddev); + if (mddev_is_clustered(mddev)) + is_reshaped = true; + } + + /* If array is no-longer degraded, then any saved_raid_disk + * information must be scrapped. + */ + if (!mddev->degraded) + rdev_for_each(rdev, mddev) + rdev->saved_raid_disk = -1; + + md_update_sb(mddev, 1); + /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can + * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by + * clustered raid */ + if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags)) + md_cluster_ops->resync_finish(mddev); + clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); + clear_bit(MD_RECOVERY_DONE, &mddev->recovery); + clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); + clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); + clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); + clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); + /* + * We call md_cluster_ops->update_size here because sync_size could + * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared, + * so it is time to update size across cluster. + */ + if (mddev_is_clustered(mddev) && is_reshaped + && !test_bit(MD_CLOSING, &mddev->flags)) + md_cluster_ops->update_size(mddev, old_dev_sectors); + /* flag recovery needed just to double check */ + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + sysfs_notify_dirent_safe(mddev->sysfs_completed); + sysfs_notify_dirent_safe(mddev->sysfs_action); + md_new_event(); + if (mddev->event_work.func) + queue_work(md_misc_wq, &mddev->event_work); + wake_up(&resync_wait); +} +EXPORT_SYMBOL(md_reap_sync_thread); + +void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev) +{ + sysfs_notify_dirent_safe(rdev->sysfs_state); + wait_event_timeout(rdev->blocked_wait, + !test_bit(Blocked, &rdev->flags) && + !test_bit(BlockedBadBlocks, &rdev->flags), + msecs_to_jiffies(5000)); + rdev_dec_pending(rdev, mddev); +} +EXPORT_SYMBOL(md_wait_for_blocked_rdev); + +void md_finish_reshape(struct mddev *mddev) +{ + /* called be personality module when reshape completes. */ + struct md_rdev *rdev; + + rdev_for_each(rdev, mddev) { + if (rdev->data_offset > rdev->new_data_offset) + rdev->sectors += rdev->data_offset - rdev->new_data_offset; + else + rdev->sectors -= rdev->new_data_offset - rdev->data_offset; + rdev->data_offset = rdev->new_data_offset; + } +} +EXPORT_SYMBOL(md_finish_reshape); + +/* Bad block management */ + +/* Returns 1 on success, 0 on failure */ +int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, + int is_new) +{ + struct mddev *mddev = rdev->mddev; + int rv; + if (is_new) + s += rdev->new_data_offset; + else + s += rdev->data_offset; + rv = badblocks_set(&rdev->badblocks, s, sectors, 0); + if (rv == 0) { + /* Make sure they get written out promptly */ + if (test_bit(ExternalBbl, &rdev->flags)) + sysfs_notify_dirent_safe(rdev->sysfs_unack_badblocks); + sysfs_notify_dirent_safe(rdev->sysfs_state); + set_mask_bits(&mddev->sb_flags, 0, + BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING)); + md_wakeup_thread(rdev->mddev->thread); + return 1; + } else + return 0; +} +EXPORT_SYMBOL_GPL(rdev_set_badblocks); + +int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, + int is_new) +{ + int rv; + if (is_new) + s += rdev->new_data_offset; + else + s += rdev->data_offset; + rv = badblocks_clear(&rdev->badblocks, s, sectors); + if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags)) + sysfs_notify_dirent_safe(rdev->sysfs_badblocks); + return rv; +} +EXPORT_SYMBOL_GPL(rdev_clear_badblocks); + +static int md_notify_reboot(struct notifier_block *this, + unsigned long code, void *x) +{ + struct mddev *mddev, *n; + int need_delay = 0; + + spin_lock(&all_mddevs_lock); + list_for_each_entry_safe(mddev, n, &all_mddevs, all_mddevs) { + if (!mddev_get(mddev)) + continue; + spin_unlock(&all_mddevs_lock); + if (mddev_trylock(mddev)) { + if (mddev->pers) + __md_stop_writes(mddev); + if (mddev->persistent) + mddev->safemode = 2; + mddev_unlock(mddev); + } + need_delay = 1; + mddev_put(mddev); + spin_lock(&all_mddevs_lock); + } + spin_unlock(&all_mddevs_lock); + + /* + * certain more exotic SCSI devices are known to be + * volatile wrt too early system reboots. While the + * right place to handle this issue is the given + * driver, we do want to have a safe RAID driver ... + */ + if (need_delay) + msleep(1000); + + return NOTIFY_DONE; +} + +static struct notifier_block md_notifier = { + .notifier_call = md_notify_reboot, + .next = NULL, + .priority = INT_MAX, /* before any real devices */ +}; + +static void md_geninit(void) +{ + pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); + + proc_create("mdstat", S_IRUGO, NULL, &mdstat_proc_ops); +} + +static int __init md_init(void) +{ + int ret = -ENOMEM; + + md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0); + if (!md_wq) + goto err_wq; + + md_misc_wq = alloc_workqueue("md_misc", 0, 0); + if (!md_misc_wq) + goto err_misc_wq; + + md_bitmap_wq = alloc_workqueue("md_bitmap", WQ_MEM_RECLAIM | WQ_UNBOUND, + 0); + if (!md_bitmap_wq) + goto err_bitmap_wq; + + ret = __register_blkdev(MD_MAJOR, "md", md_probe); + if (ret < 0) + goto err_md; + + ret = __register_blkdev(0, "mdp", md_probe); + if (ret < 0) + goto err_mdp; + mdp_major = ret; + + register_reboot_notifier(&md_notifier); + raid_table_header = register_sysctl("dev/raid", raid_table); + + md_geninit(); + return 0; + +err_mdp: + unregister_blkdev(MD_MAJOR, "md"); +err_md: + destroy_workqueue(md_bitmap_wq); +err_bitmap_wq: + destroy_workqueue(md_misc_wq); +err_misc_wq: + destroy_workqueue(md_wq); +err_wq: + return ret; +} + +static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev) +{ + struct mdp_superblock_1 *sb = page_address(rdev->sb_page); + struct md_rdev *rdev2, *tmp; + int role, ret; + + /* + * If size is changed in another node then we need to + * do resize as well. + */ + if (mddev->dev_sectors != le64_to_cpu(sb->size)) { + ret = mddev->pers->resize(mddev, le64_to_cpu(sb->size)); + if (ret) + pr_info("md-cluster: resize failed\n"); + else + md_bitmap_update_sb(mddev->bitmap); + } + + /* Check for change of roles in the active devices */ + rdev_for_each_safe(rdev2, tmp, mddev) { + if (test_bit(Faulty, &rdev2->flags)) + continue; + + /* Check if the roles changed */ + role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]); + + if (test_bit(Candidate, &rdev2->flags)) { + if (role == MD_DISK_ROLE_FAULTY) { + pr_info("md: Removing Candidate device %pg because add failed\n", + rdev2->bdev); + md_kick_rdev_from_array(rdev2); + continue; + } + else + clear_bit(Candidate, &rdev2->flags); + } + + if (role != rdev2->raid_disk) { + /* + * got activated except reshape is happening. + */ + if (rdev2->raid_disk == -1 && role != MD_DISK_ROLE_SPARE && + !(le32_to_cpu(sb->feature_map) & + MD_FEATURE_RESHAPE_ACTIVE)) { + rdev2->saved_raid_disk = role; + ret = remove_and_add_spares(mddev, rdev2); + pr_info("Activated spare: %pg\n", + rdev2->bdev); + /* wakeup mddev->thread here, so array could + * perform resync with the new activated disk */ + set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); + md_wakeup_thread(mddev->thread); + } + /* device faulty + * We just want to do the minimum to mark the disk + * as faulty. The recovery is performed by the + * one who initiated the error. + */ + if (role == MD_DISK_ROLE_FAULTY || + role == MD_DISK_ROLE_JOURNAL) { + md_error(mddev, rdev2); + clear_bit(Blocked, &rdev2->flags); + } + } + } + + if (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) { + ret = update_raid_disks(mddev, le32_to_cpu(sb->raid_disks)); + if (ret) + pr_warn("md: updating array disks failed. %d\n", ret); + } + + /* + * Since mddev->delta_disks has already updated in update_raid_disks, + * so it is time to check reshape. + */ + if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) && + (le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { + /* + * reshape is happening in the remote node, we need to + * update reshape_position and call start_reshape. + */ + mddev->reshape_position = le64_to_cpu(sb->reshape_position); + if (mddev->pers->update_reshape_pos) + mddev->pers->update_reshape_pos(mddev); + if (mddev->pers->start_reshape) + mddev->pers->start_reshape(mddev); + } else if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) && + mddev->reshape_position != MaxSector && + !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { + /* reshape is just done in another node. */ + mddev->reshape_position = MaxSector; + if (mddev->pers->update_reshape_pos) + mddev->pers->update_reshape_pos(mddev); + } + + /* Finally set the event to be up to date */ + mddev->events = le64_to_cpu(sb->events); +} + +static int read_rdev(struct mddev *mddev, struct md_rdev *rdev) +{ + int err; + struct page *swapout = rdev->sb_page; + struct mdp_superblock_1 *sb; + + /* Store the sb page of the rdev in the swapout temporary + * variable in case we err in the future + */ + rdev->sb_page = NULL; + err = alloc_disk_sb(rdev); + if (err == 0) { + ClearPageUptodate(rdev->sb_page); + rdev->sb_loaded = 0; + err = super_types[mddev->major_version]. + load_super(rdev, NULL, mddev->minor_version); + } + if (err < 0) { + pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n", + __func__, __LINE__, rdev->desc_nr, err); + if (rdev->sb_page) + put_page(rdev->sb_page); + rdev->sb_page = swapout; + rdev->sb_loaded = 1; + return err; + } + + sb = page_address(rdev->sb_page); + /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET + * is not set + */ + + if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET)) + rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); + + /* The other node finished recovery, call spare_active to set + * device In_sync and mddev->degraded + */ + if (rdev->recovery_offset == MaxSector && + !test_bit(In_sync, &rdev->flags) && + mddev->pers->spare_active(mddev)) + sysfs_notify_dirent_safe(mddev->sysfs_degraded); + + put_page(swapout); + return 0; +} + +void md_reload_sb(struct mddev *mddev, int nr) +{ + struct md_rdev *rdev = NULL, *iter; + int err; + + /* Find the rdev */ + rdev_for_each_rcu(iter, mddev) { + if (iter->desc_nr == nr) { + rdev = iter; + break; + } + } + + if (!rdev) { + pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr); + return; + } + + err = read_rdev(mddev, rdev); + if (err < 0) + return; + + check_sb_changes(mddev, rdev); + + /* Read all rdev's to update recovery_offset */ + rdev_for_each_rcu(rdev, mddev) { + if (!test_bit(Faulty, &rdev->flags)) + read_rdev(mddev, rdev); + } +} +EXPORT_SYMBOL(md_reload_sb); + +#ifndef MODULE + +/* + * Searches all registered partitions for autorun RAID arrays + * at boot time. + */ + +static DEFINE_MUTEX(detected_devices_mutex); +static LIST_HEAD(all_detected_devices); +struct detected_devices_node { + struct list_head list; + dev_t dev; +}; + +void md_autodetect_dev(dev_t dev) +{ + struct detected_devices_node *node_detected_dev; + + node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); + if (node_detected_dev) { + node_detected_dev->dev = dev; + mutex_lock(&detected_devices_mutex); + list_add_tail(&node_detected_dev->list, &all_detected_devices); + mutex_unlock(&detected_devices_mutex); + } +} + +void md_autostart_arrays(int part) +{ + struct md_rdev *rdev; + struct detected_devices_node *node_detected_dev; + dev_t dev; + int i_scanned, i_passed; + + i_scanned = 0; + i_passed = 0; + + pr_info("md: Autodetecting RAID arrays.\n"); + + mutex_lock(&detected_devices_mutex); + while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { + i_scanned++; + node_detected_dev = list_entry(all_detected_devices.next, + struct detected_devices_node, list); + list_del(&node_detected_dev->list); + dev = node_detected_dev->dev; + kfree(node_detected_dev); + mutex_unlock(&detected_devices_mutex); + rdev = md_import_device(dev,0, 90); + mutex_lock(&detected_devices_mutex); + if (IS_ERR(rdev)) + continue; + + if (test_bit(Faulty, &rdev->flags)) + continue; + + set_bit(AutoDetected, &rdev->flags); + list_add(&rdev->same_set, &pending_raid_disks); + i_passed++; + } + mutex_unlock(&detected_devices_mutex); + + pr_debug("md: Scanned %d and added %d devices.\n", i_scanned, i_passed); + + autorun_devices(part); +} + +#endif /* !MODULE */ + +static __exit void md_exit(void) +{ + struct mddev *mddev, *n; + int delay = 1; + + unregister_blkdev(MD_MAJOR,"md"); + unregister_blkdev(mdp_major, "mdp"); + unregister_reboot_notifier(&md_notifier); + unregister_sysctl_table(raid_table_header); + + /* We cannot unload the modules while some process is + * waiting for us in select() or poll() - wake them up + */ + md_unloading = 1; + while (waitqueue_active(&md_event_waiters)) { + /* not safe to leave yet */ + wake_up(&md_event_waiters); + msleep(delay); + delay += delay; + } + remove_proc_entry("mdstat", NULL); + + spin_lock(&all_mddevs_lock); + list_for_each_entry_safe(mddev, n, &all_mddevs, all_mddevs) { + if (!mddev_get(mddev)) + continue; + spin_unlock(&all_mddevs_lock); + export_array(mddev); + mddev->ctime = 0; + mddev->hold_active = 0; + /* + * As the mddev is now fully clear, mddev_put will schedule + * the mddev for destruction by a workqueue, and the + * destroy_workqueue() below will wait for that to complete. + */ + mddev_put(mddev); + spin_lock(&all_mddevs_lock); + } + spin_unlock(&all_mddevs_lock); + + destroy_workqueue(md_misc_wq); + destroy_workqueue(md_bitmap_wq); + destroy_workqueue(md_wq); +} + +subsys_initcall(md_init); +module_exit(md_exit) + +static int get_ro(char *buffer, const struct kernel_param *kp) +{ + return sprintf(buffer, "%d\n", start_readonly); +} +static int set_ro(const char *val, const struct kernel_param *kp) +{ + return kstrtouint(val, 10, (unsigned int *)&start_readonly); +} + +module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); +module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); +module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); +module_param(create_on_open, bool, S_IRUSR|S_IWUSR); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("MD RAID framework"); +MODULE_ALIAS("md"); +MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |