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Diffstat (limited to 'fs/btrfs/volumes.h')
| -rw-r--r-- | fs/btrfs/volumes.h | 575 |
1 files changed, 575 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h new file mode 100644 index 000000000..65cd023b0 --- /dev/null +++ b/fs/btrfs/volumes.h @@ -0,0 +1,575 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2007 Oracle. All rights reserved. + */ + +#ifndef BTRFS_VOLUMES_H +#define BTRFS_VOLUMES_H + +#include <linux/bio.h> +#include <linux/sort.h> +#include <linux/btrfs.h> +#include "async-thread.h" + +#define BTRFS_MAX_DATA_CHUNK_SIZE (10ULL * SZ_1G) + +extern struct mutex uuid_mutex; + +#define BTRFS_STRIPE_LEN SZ_64K + +struct buffer_head; +struct btrfs_pending_bios { + struct bio *head; + struct bio *tail; +}; + +/* + * Use sequence counter to get consistent device stat data on + * 32-bit processors. + */ +#if BITS_PER_LONG==32 && defined(CONFIG_SMP) +#include <linux/seqlock.h> +#define __BTRFS_NEED_DEVICE_DATA_ORDERED +#define btrfs_device_data_ordered_init(device) \ + seqcount_init(&device->data_seqcount) +#else +#define btrfs_device_data_ordered_init(device) do { } while (0) +#endif + +#define BTRFS_DEV_STATE_WRITEABLE (0) +#define BTRFS_DEV_STATE_IN_FS_METADATA (1) +#define BTRFS_DEV_STATE_MISSING (2) +#define BTRFS_DEV_STATE_REPLACE_TGT (3) +#define BTRFS_DEV_STATE_FLUSH_SENT (4) + +struct btrfs_device { + struct list_head dev_list; + struct list_head dev_alloc_list; + struct btrfs_fs_devices *fs_devices; + struct btrfs_fs_info *fs_info; + + struct rcu_string *name; + + u64 generation; + + spinlock_t io_lock ____cacheline_aligned; + int running_pending; + /* When true means this device has pending chunk alloc in + * current transaction. Protected by chunk_mutex. + */ + bool has_pending_chunks; + + /* regular prio bios */ + struct btrfs_pending_bios pending_bios; + /* sync bios */ + struct btrfs_pending_bios pending_sync_bios; + + struct block_device *bdev; + + /* the mode sent to blkdev_get */ + fmode_t mode; + + unsigned long dev_state; + blk_status_t last_flush_error; + int flush_bio_sent; + +#ifdef __BTRFS_NEED_DEVICE_DATA_ORDERED + seqcount_t data_seqcount; +#endif + + /* the internal btrfs device id */ + u64 devid; + + /* size of the device in memory */ + u64 total_bytes; + + /* size of the device on disk */ + u64 disk_total_bytes; + + /* bytes used */ + u64 bytes_used; + + /* optimal io alignment for this device */ + u32 io_align; + + /* optimal io width for this device */ + u32 io_width; + /* type and info about this device */ + u64 type; + + /* minimal io size for this device */ + u32 sector_size; + + /* physical drive uuid (or lvm uuid) */ + u8 uuid[BTRFS_UUID_SIZE]; + + /* + * size of the device on the current transaction + * + * This variant is update when committing the transaction, + * and protected by device_list_mutex + */ + u64 commit_total_bytes; + + /* bytes used on the current transaction */ + u64 commit_bytes_used; + /* + * used to manage the device which is resized + * + * It is protected by chunk_lock. + */ + struct list_head resized_list; + + /* for sending down flush barriers */ + struct bio *flush_bio; + struct completion flush_wait; + + /* per-device scrub information */ + struct scrub_ctx *scrub_ctx; + + struct btrfs_work work; + struct rcu_head rcu; + + /* readahead state */ + atomic_t reada_in_flight; + u64 reada_next; + struct reada_zone *reada_curr_zone; + struct radix_tree_root reada_zones; + struct radix_tree_root reada_extents; + + /* disk I/O failure stats. For detailed description refer to + * enum btrfs_dev_stat_values in ioctl.h */ + int dev_stats_valid; + + /* Counter to record the change of device stats */ + atomic_t dev_stats_ccnt; + atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX]; +}; + +/* + * If we read those variants at the context of their own lock, we needn't + * use the following helpers, reading them directly is safe. + */ +#if BITS_PER_LONG==32 && defined(CONFIG_SMP) +#define BTRFS_DEVICE_GETSET_FUNCS(name) \ +static inline u64 \ +btrfs_device_get_##name(const struct btrfs_device *dev) \ +{ \ + u64 size; \ + unsigned int seq; \ + \ + do { \ + seq = read_seqcount_begin(&dev->data_seqcount); \ + size = dev->name; \ + } while (read_seqcount_retry(&dev->data_seqcount, seq)); \ + return size; \ +} \ + \ +static inline void \ +btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \ +{ \ + preempt_disable(); \ + write_seqcount_begin(&dev->data_seqcount); \ + dev->name = size; \ + write_seqcount_end(&dev->data_seqcount); \ + preempt_enable(); \ +} +#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) +#define BTRFS_DEVICE_GETSET_FUNCS(name) \ +static inline u64 \ +btrfs_device_get_##name(const struct btrfs_device *dev) \ +{ \ + u64 size; \ + \ + preempt_disable(); \ + size = dev->name; \ + preempt_enable(); \ + return size; \ +} \ + \ +static inline void \ +btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \ +{ \ + preempt_disable(); \ + dev->name = size; \ + preempt_enable(); \ +} +#else +#define BTRFS_DEVICE_GETSET_FUNCS(name) \ +static inline u64 \ +btrfs_device_get_##name(const struct btrfs_device *dev) \ +{ \ + return dev->name; \ +} \ + \ +static inline void \ +btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \ +{ \ + dev->name = size; \ +} +#endif + +BTRFS_DEVICE_GETSET_FUNCS(total_bytes); +BTRFS_DEVICE_GETSET_FUNCS(disk_total_bytes); +BTRFS_DEVICE_GETSET_FUNCS(bytes_used); + +struct btrfs_fs_devices { + u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ + struct list_head fs_list; + + u64 num_devices; + u64 open_devices; + u64 rw_devices; + u64 missing_devices; + u64 total_rw_bytes; + u64 total_devices; + struct block_device *latest_bdev; + + /* all of the devices in the FS, protected by a mutex + * so we can safely walk it to write out the supers without + * worrying about add/remove by the multi-device code. + * Scrubbing super can kick off supers writing by holding + * this mutex lock. + */ + struct mutex device_list_mutex; + struct list_head devices; + + struct list_head resized_devices; + /* devices not currently being allocated */ + struct list_head alloc_list; + + struct btrfs_fs_devices *seed; + int seeding; + + int opened; + + /* set when we find or add a device that doesn't have the + * nonrot flag set + */ + int rotating; + + struct btrfs_fs_info *fs_info; + /* sysfs kobjects */ + struct kobject fsid_kobj; + struct kobject *device_dir_kobj; + struct completion kobj_unregister; +}; + +#define BTRFS_BIO_INLINE_CSUM_SIZE 64 + +#define BTRFS_MAX_DEVS(info) ((BTRFS_MAX_ITEM_SIZE(info) \ + - sizeof(struct btrfs_chunk)) \ + / sizeof(struct btrfs_stripe) + 1) + +#define BTRFS_MAX_DEVS_SYS_CHUNK ((BTRFS_SYSTEM_CHUNK_ARRAY_SIZE \ + - 2 * sizeof(struct btrfs_disk_key) \ + - 2 * sizeof(struct btrfs_chunk)) \ + / sizeof(struct btrfs_stripe) + 1) + +/* + * we need the mirror number and stripe index to be passed around + * the call chain while we are processing end_io (especially errors). + * Really, what we need is a btrfs_bio structure that has this info + * and is properly sized with its stripe array, but we're not there + * quite yet. We have our own btrfs bioset, and all of the bios + * we allocate are actually btrfs_io_bios. We'll cram as much of + * struct btrfs_bio as we can into this over time. + */ +typedef void (btrfs_io_bio_end_io_t) (struct btrfs_io_bio *bio, int err); +struct btrfs_io_bio { + unsigned int mirror_num; + unsigned int stripe_index; + u64 logical; + u8 *csum; + u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE]; + u8 *csum_allocated; + btrfs_io_bio_end_io_t *end_io; + struct bvec_iter iter; + /* + * This member must come last, bio_alloc_bioset will allocate enough + * bytes for entire btrfs_io_bio but relies on bio being last. + */ + struct bio bio; +}; + +static inline struct btrfs_io_bio *btrfs_io_bio(struct bio *bio) +{ + return container_of(bio, struct btrfs_io_bio, bio); +} + +struct btrfs_bio_stripe { + struct btrfs_device *dev; + u64 physical; + u64 length; /* only used for discard mappings */ +}; + +struct btrfs_bio; +typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err); + +struct btrfs_bio { + refcount_t refs; + atomic_t stripes_pending; + struct btrfs_fs_info *fs_info; + u64 map_type; /* get from map_lookup->type */ + bio_end_io_t *end_io; + struct bio *orig_bio; + void *private; + atomic_t error; + int max_errors; + int num_stripes; + int mirror_num; + int num_tgtdevs; + int *tgtdev_map; + /* + * logical block numbers for the start of each stripe + * The last one or two are p/q. These are sorted, + * so raid_map[0] is the start of our full stripe + */ + u64 *raid_map; + struct btrfs_bio_stripe stripes[]; +}; + +struct btrfs_device_info { + struct btrfs_device *dev; + u64 dev_offset; + u64 max_avail; + u64 total_avail; +}; + +struct btrfs_raid_attr { + int sub_stripes; /* sub_stripes info for map */ + int dev_stripes; /* stripes per dev */ + int devs_max; /* max devs to use */ + int devs_min; /* min devs needed */ + int tolerated_failures; /* max tolerated fail devs */ + int devs_increment; /* ndevs has to be a multiple of this */ + int ncopies; /* how many copies to data has */ + int mindev_error; /* error code if min devs requisite is unmet */ + const char raid_name[8]; /* name of the raid */ + u64 bg_flag; /* block group flag of the raid */ +}; + +extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES]; + +struct map_lookup { + u64 type; + int io_align; + int io_width; + u64 stripe_len; + int num_stripes; + int sub_stripes; + int verified_stripes; /* For mount time dev extent verification */ + struct btrfs_bio_stripe stripes[]; +}; + +#define map_lookup_size(n) (sizeof(struct map_lookup) + \ + (sizeof(struct btrfs_bio_stripe) * (n))) + +struct btrfs_balance_args; +struct btrfs_balance_progress; +struct btrfs_balance_control { + struct btrfs_balance_args data; + struct btrfs_balance_args meta; + struct btrfs_balance_args sys; + + u64 flags; + + struct btrfs_balance_progress stat; +}; + +enum btrfs_map_op { + BTRFS_MAP_READ, + BTRFS_MAP_WRITE, + BTRFS_MAP_DISCARD, + BTRFS_MAP_GET_READ_MIRRORS, +}; + +static inline enum btrfs_map_op btrfs_op(struct bio *bio) +{ + switch (bio_op(bio)) { + case REQ_OP_DISCARD: + return BTRFS_MAP_DISCARD; + case REQ_OP_WRITE: + return BTRFS_MAP_WRITE; + default: + WARN_ON_ONCE(1); + case REQ_OP_READ: + return BTRFS_MAP_READ; + } +} + +void btrfs_get_bbio(struct btrfs_bio *bbio); +void btrfs_put_bbio(struct btrfs_bio *bbio); +int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, + u64 logical, u64 *length, + struct btrfs_bio **bbio_ret, int mirror_num); +int btrfs_map_sblock(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, + u64 logical, u64 *length, + struct btrfs_bio **bbio_ret); +int btrfs_rmap_block(struct btrfs_fs_info *fs_info, u64 chunk_start, + u64 physical, u64 **logical, int *naddrs, int *stripe_len); +int btrfs_read_sys_array(struct btrfs_fs_info *fs_info); +int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info); +int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, u64 type); +void btrfs_mapping_init(struct btrfs_mapping_tree *tree); +void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree); +blk_status_t btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio, + int mirror_num, int async_submit); +int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, + fmode_t flags, void *holder); +struct btrfs_device *btrfs_scan_one_device(const char *path, + fmode_t flags, void *holder); +int btrfs_close_devices(struct btrfs_fs_devices *fs_devices); +void btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices, int step); +void btrfs_assign_next_active_device(struct btrfs_device *device, + struct btrfs_device *this_dev); +int btrfs_find_device_missing_or_by_path(struct btrfs_fs_info *fs_info, + const char *device_path, + struct btrfs_device **device); +int btrfs_find_device_by_devspec(struct btrfs_fs_info *fs_info, u64 devid, + const char *devpath, + struct btrfs_device **device); +struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info, + const u64 *devid, + const u8 *uuid); +void btrfs_free_device(struct btrfs_device *device); +int btrfs_rm_device(struct btrfs_fs_info *fs_info, + const char *device_path, u64 devid); +void __exit btrfs_cleanup_fs_uuids(void); +int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len); +int btrfs_grow_device(struct btrfs_trans_handle *trans, + struct btrfs_device *device, u64 new_size); +struct btrfs_device *btrfs_find_device(struct btrfs_fs_devices *fs_devices, + u64 devid, u8 *uuid, u8 *fsid, bool seed); +int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); +int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *path); +int btrfs_balance(struct btrfs_fs_info *fs_info, + struct btrfs_balance_control *bctl, + struct btrfs_ioctl_balance_args *bargs); +int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info); +int btrfs_recover_balance(struct btrfs_fs_info *fs_info); +int btrfs_pause_balance(struct btrfs_fs_info *fs_info); +int btrfs_cancel_balance(struct btrfs_fs_info *fs_info); +int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info); +int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info); +int btrfs_chunk_readonly(struct btrfs_fs_info *fs_info, u64 chunk_offset); +int find_free_dev_extent_start(struct btrfs_transaction *transaction, + struct btrfs_device *device, u64 num_bytes, + u64 search_start, u64 *start, u64 *max_avail); +int find_free_dev_extent(struct btrfs_trans_handle *trans, + struct btrfs_device *device, u64 num_bytes, + u64 *start, u64 *max_avail); +void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index); +int btrfs_get_dev_stats(struct btrfs_fs_info *fs_info, + struct btrfs_ioctl_get_dev_stats *stats); +void btrfs_init_devices_late(struct btrfs_fs_info *fs_info); +int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info); +int btrfs_run_dev_stats(struct btrfs_trans_handle *trans, + struct btrfs_fs_info *fs_info); +void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_device *srcdev); +void btrfs_rm_dev_replace_free_srcdev(struct btrfs_fs_info *fs_info, + struct btrfs_device *srcdev); +void btrfs_destroy_dev_replace_tgtdev(struct btrfs_device *tgtdev); +void btrfs_scratch_superblocks(struct block_device *bdev, const char *device_path); +int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info, + u64 logical, u64 len); +unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info, + u64 logical); +int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans, + u64 chunk_offset, u64 chunk_size); +int btrfs_remove_chunk(struct btrfs_trans_handle *trans, u64 chunk_offset); + +static inline void btrfs_dev_stat_inc(struct btrfs_device *dev, + int index) +{ + atomic_inc(dev->dev_stat_values + index); + /* + * This memory barrier orders stores updating statistics before stores + * updating dev_stats_ccnt. + * + * It pairs with smp_rmb() in btrfs_run_dev_stats(). + */ + smp_mb__before_atomic(); + atomic_inc(&dev->dev_stats_ccnt); +} + +static inline int btrfs_dev_stat_read(struct btrfs_device *dev, + int index) +{ + return atomic_read(dev->dev_stat_values + index); +} + +static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev, + int index) +{ + int ret; + + ret = atomic_xchg(dev->dev_stat_values + index, 0); + /* + * atomic_xchg implies a full memory barriers as per atomic_t.txt: + * - RMW operations that have a return value are fully ordered; + * + * This implicit memory barriers is paired with the smp_rmb in + * btrfs_run_dev_stats + */ + atomic_inc(&dev->dev_stats_ccnt); + return ret; +} + +static inline void btrfs_dev_stat_set(struct btrfs_device *dev, + int index, unsigned long val) +{ + atomic_set(dev->dev_stat_values + index, val); + /* + * This memory barrier orders stores updating statistics before stores + * updating dev_stats_ccnt. + * + * It pairs with smp_rmb() in btrfs_run_dev_stats(). + */ + smp_mb__before_atomic(); + atomic_inc(&dev->dev_stats_ccnt); +} + +static inline void btrfs_dev_stat_reset(struct btrfs_device *dev, + int index) +{ + btrfs_dev_stat_set(dev, index, 0); +} + +/* + * Convert block group flags (BTRFS_BLOCK_GROUP_*) to btrfs_raid_types, which + * can be used as index to access btrfs_raid_array[]. + */ +static inline enum btrfs_raid_types btrfs_bg_flags_to_raid_index(u64 flags) +{ + if (flags & BTRFS_BLOCK_GROUP_RAID10) + return BTRFS_RAID_RAID10; + else if (flags & BTRFS_BLOCK_GROUP_RAID1) + return BTRFS_RAID_RAID1; + else if (flags & BTRFS_BLOCK_GROUP_DUP) + return BTRFS_RAID_DUP; + else if (flags & BTRFS_BLOCK_GROUP_RAID0) + return BTRFS_RAID_RAID0; + else if (flags & BTRFS_BLOCK_GROUP_RAID5) + return BTRFS_RAID_RAID5; + else if (flags & BTRFS_BLOCK_GROUP_RAID6) + return BTRFS_RAID_RAID6; + + return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */ +} + +const char *get_raid_name(enum btrfs_raid_types type); + +void btrfs_update_commit_device_size(struct btrfs_fs_info *fs_info); +void btrfs_update_commit_device_bytes_used(struct btrfs_transaction *trans); + +struct list_head *btrfs_get_fs_uuids(void); +void btrfs_set_fs_info_ptr(struct btrfs_fs_info *fs_info); +void btrfs_reset_fs_info_ptr(struct btrfs_fs_info *fs_info); +bool btrfs_check_rw_degradable(struct btrfs_fs_info *fs_info, + struct btrfs_device *failing_dev); + +int btrfs_bg_type_to_factor(u64 flags); +int btrfs_verify_dev_extents(struct btrfs_fs_info *fs_info); + +#endif |