diff options
Diffstat (limited to 'fs/gfs2/ops_fstype.c')
| -rw-r--r-- | fs/gfs2/ops_fstype.c | 1828 |
1 files changed, 1828 insertions, 0 deletions
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c new file mode 100644 index 000000000..dd64140ae --- /dev/null +++ b/fs/gfs2/ops_fstype.c @@ -0,0 +1,1828 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. + * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/completion.h> +#include <linux/buffer_head.h> +#include <linux/blkdev.h> +#include <linux/kthread.h> +#include <linux/export.h> +#include <linux/namei.h> +#include <linux/mount.h> +#include <linux/gfs2_ondisk.h> +#include <linux/quotaops.h> +#include <linux/lockdep.h> +#include <linux/module.h> +#include <linux/backing-dev.h> +#include <linux/fs_parser.h> + +#include "gfs2.h" +#include "incore.h" +#include "bmap.h" +#include "glock.h" +#include "glops.h" +#include "inode.h" +#include "recovery.h" +#include "rgrp.h" +#include "super.h" +#include "sys.h" +#include "util.h" +#include "log.h" +#include "quota.h" +#include "dir.h" +#include "meta_io.h" +#include "trace_gfs2.h" +#include "lops.h" + +#define DO 0 +#define UNDO 1 + +/** + * gfs2_tune_init - Fill a gfs2_tune structure with default values + * @gt: tune + * + */ + +static void gfs2_tune_init(struct gfs2_tune *gt) +{ + spin_lock_init(>->gt_spin); + + gt->gt_quota_warn_period = 10; + gt->gt_quota_scale_num = 1; + gt->gt_quota_scale_den = 1; + gt->gt_new_files_jdata = 0; + gt->gt_max_readahead = BIT(18); + gt->gt_complain_secs = 10; +} + +void free_sbd(struct gfs2_sbd *sdp) +{ + if (sdp->sd_lkstats) + free_percpu(sdp->sd_lkstats); + kfree(sdp); +} + +static struct gfs2_sbd *init_sbd(struct super_block *sb) +{ + struct gfs2_sbd *sdp; + struct address_space *mapping; + + sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL); + if (!sdp) + return NULL; + + sdp->sd_vfs = sb; + sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats); + if (!sdp->sd_lkstats) + goto fail; + sb->s_fs_info = sdp; + + set_bit(SDF_NOJOURNALID, &sdp->sd_flags); + gfs2_tune_init(&sdp->sd_tune); + + init_waitqueue_head(&sdp->sd_kill_wait); + init_waitqueue_head(&sdp->sd_async_glock_wait); + atomic_set(&sdp->sd_glock_disposal, 0); + init_completion(&sdp->sd_locking_init); + init_completion(&sdp->sd_wdack); + spin_lock_init(&sdp->sd_statfs_spin); + + spin_lock_init(&sdp->sd_rindex_spin); + sdp->sd_rindex_tree.rb_node = NULL; + + INIT_LIST_HEAD(&sdp->sd_jindex_list); + spin_lock_init(&sdp->sd_jindex_spin); + mutex_init(&sdp->sd_jindex_mutex); + init_completion(&sdp->sd_journal_ready); + + INIT_LIST_HEAD(&sdp->sd_quota_list); + mutex_init(&sdp->sd_quota_mutex); + mutex_init(&sdp->sd_quota_sync_mutex); + init_waitqueue_head(&sdp->sd_quota_wait); + spin_lock_init(&sdp->sd_bitmap_lock); + + INIT_LIST_HEAD(&sdp->sd_sc_inodes_list); + + mapping = &sdp->sd_aspace; + + address_space_init_once(mapping); + mapping->a_ops = &gfs2_rgrp_aops; + mapping->host = sb->s_bdev->bd_inode; + mapping->flags = 0; + mapping_set_gfp_mask(mapping, GFP_NOFS); + mapping->private_data = NULL; + mapping->writeback_index = 0; + + spin_lock_init(&sdp->sd_log_lock); + atomic_set(&sdp->sd_log_pinned, 0); + INIT_LIST_HEAD(&sdp->sd_log_revokes); + INIT_LIST_HEAD(&sdp->sd_log_ordered); + spin_lock_init(&sdp->sd_ordered_lock); + + init_waitqueue_head(&sdp->sd_log_waitq); + init_waitqueue_head(&sdp->sd_logd_waitq); + spin_lock_init(&sdp->sd_ail_lock); + INIT_LIST_HEAD(&sdp->sd_ail1_list); + INIT_LIST_HEAD(&sdp->sd_ail2_list); + + init_rwsem(&sdp->sd_log_flush_lock); + atomic_set(&sdp->sd_log_in_flight, 0); + init_waitqueue_head(&sdp->sd_log_flush_wait); + mutex_init(&sdp->sd_freeze_mutex); + + return sdp; + +fail: + free_sbd(sdp); + return NULL; +} + +/** + * gfs2_check_sb - Check superblock + * @sdp: the filesystem + * @silent: Don't print a message if the check fails + * + * Checks the version code of the FS is one that we understand how to + * read and that the sizes of the various on-disk structures have not + * changed. + */ + +static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent) +{ + struct gfs2_sb_host *sb = &sdp->sd_sb; + + if (sb->sb_magic != GFS2_MAGIC || + sb->sb_type != GFS2_METATYPE_SB) { + if (!silent) + pr_warn("not a GFS2 filesystem\n"); + return -EINVAL; + } + + if (sb->sb_fs_format < GFS2_FS_FORMAT_MIN || + sb->sb_fs_format > GFS2_FS_FORMAT_MAX || + sb->sb_multihost_format != GFS2_FORMAT_MULTI) { + fs_warn(sdp, "Unknown on-disk format, unable to mount\n"); + return -EINVAL; + } + + if (sb->sb_bsize < 512 || sb->sb_bsize > PAGE_SIZE || + (sb->sb_bsize & (sb->sb_bsize - 1))) { + pr_warn("Invalid block size\n"); + return -EINVAL; + } + if (sb->sb_bsize_shift != ffs(sb->sb_bsize) - 1) { + pr_warn("Invalid block size shift\n"); + return -EINVAL; + } + return 0; +} + +static void end_bio_io_page(struct bio *bio) +{ + struct page *page = bio->bi_private; + + if (!bio->bi_status) + SetPageUptodate(page); + else + pr_warn("error %d reading superblock\n", bio->bi_status); + unlock_page(page); +} + +static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf) +{ + struct gfs2_sb_host *sb = &sdp->sd_sb; + struct super_block *s = sdp->sd_vfs; + const struct gfs2_sb *str = buf; + + sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic); + sb->sb_type = be32_to_cpu(str->sb_header.mh_type); + sb->sb_fs_format = be32_to_cpu(str->sb_fs_format); + sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format); + sb->sb_bsize = be32_to_cpu(str->sb_bsize); + sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift); + sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr); + sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino); + sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr); + sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino); + + memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN); + memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN); + memcpy(&s->s_uuid, str->sb_uuid, 16); +} + +/** + * gfs2_read_super - Read the gfs2 super block from disk + * @sdp: The GFS2 super block + * @sector: The location of the super block + * @silent: Don't print a message if the check fails + * + * This uses the bio functions to read the super block from disk + * because we want to be 100% sure that we never read cached data. + * A super block is read twice only during each GFS2 mount and is + * never written to by the filesystem. The first time its read no + * locks are held, and the only details which are looked at are those + * relating to the locking protocol. Once locking is up and working, + * the sb is read again under the lock to establish the location of + * the master directory (contains pointers to journals etc) and the + * root directory. + * + * Returns: 0 on success or error + */ + +static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent) +{ + struct super_block *sb = sdp->sd_vfs; + struct gfs2_sb *p; + struct page *page; + struct bio *bio; + + page = alloc_page(GFP_NOFS); + if (unlikely(!page)) + return -ENOMEM; + + ClearPageUptodate(page); + ClearPageDirty(page); + lock_page(page); + + bio = bio_alloc(sb->s_bdev, 1, REQ_OP_READ | REQ_META, GFP_NOFS); + bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9); + __bio_add_page(bio, page, PAGE_SIZE, 0); + + bio->bi_end_io = end_bio_io_page; + bio->bi_private = page; + submit_bio(bio); + wait_on_page_locked(page); + bio_put(bio); + if (!PageUptodate(page)) { + __free_page(page); + return -EIO; + } + p = kmap(page); + gfs2_sb_in(sdp, p); + kunmap(page); + __free_page(page); + return gfs2_check_sb(sdp, silent); +} + +/** + * gfs2_read_sb - Read super block + * @sdp: The GFS2 superblock + * @silent: Don't print message if mount fails + * + */ + +static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent) +{ + u32 hash_blocks, ind_blocks, leaf_blocks; + u32 tmp_blocks; + unsigned int x; + int error; + + error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); + if (error) { + if (!silent) + fs_err(sdp, "can't read superblock\n"); + return error; + } + + sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - + GFS2_BASIC_BLOCK_SHIFT; + sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift); + sdp->sd_diptrs = (sdp->sd_sb.sb_bsize - + sizeof(struct gfs2_dinode)) / sizeof(u64); + sdp->sd_inptrs = (sdp->sd_sb.sb_bsize - + sizeof(struct gfs2_meta_header)) / sizeof(u64); + sdp->sd_ldptrs = (sdp->sd_sb.sb_bsize - + sizeof(struct gfs2_log_descriptor)) / sizeof(u64); + sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header); + sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2; + sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1; + sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64); + sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize - + sizeof(struct gfs2_meta_header)) / + sizeof(struct gfs2_quota_change); + sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize - + sizeof(struct gfs2_meta_header)) + * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */ + + /* + * We always keep at least one block reserved for revokes in + * transactions. This greatly simplifies allocating additional + * revoke blocks. + */ + atomic_set(&sdp->sd_log_revokes_available, sdp->sd_ldptrs); + + /* Compute maximum reservation required to add a entry to a directory */ + + hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH), + sdp->sd_jbsize); + + ind_blocks = 0; + for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) { + tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs); + ind_blocks += tmp_blocks; + } + + leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH; + + sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks; + + sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize - + sizeof(struct gfs2_dinode); + sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs; + for (x = 2;; x++) { + u64 space, d; + u32 m; + + space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs; + d = space; + m = do_div(d, sdp->sd_inptrs); + + if (d != sdp->sd_heightsize[x - 1] || m) + break; + sdp->sd_heightsize[x] = space; + } + sdp->sd_max_height = x; + sdp->sd_heightsize[x] = ~0; + gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT); + + sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize - + sizeof(struct gfs2_leaf)) / + GFS2_MIN_DIRENT_SIZE; + return 0; +} + +static int init_names(struct gfs2_sbd *sdp, int silent) +{ + char *proto, *table; + int error = 0; + + proto = sdp->sd_args.ar_lockproto; + table = sdp->sd_args.ar_locktable; + + /* Try to autodetect */ + + if (!proto[0] || !table[0]) { + error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); + if (error) + return error; + + if (!proto[0]) + proto = sdp->sd_sb.sb_lockproto; + if (!table[0]) + table = sdp->sd_sb.sb_locktable; + } + + if (!table[0]) + table = sdp->sd_vfs->s_id; + + BUILD_BUG_ON(GFS2_LOCKNAME_LEN > GFS2_FSNAME_LEN); + + strscpy(sdp->sd_proto_name, proto, GFS2_LOCKNAME_LEN); + strscpy(sdp->sd_table_name, table, GFS2_LOCKNAME_LEN); + + table = sdp->sd_table_name; + while ((table = strchr(table, '/'))) + *table = '_'; + + return error; +} + +static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh, + int undo) +{ + int error = 0; + + if (undo) + goto fail_trans; + + error = gfs2_glock_nq_num(sdp, + GFS2_MOUNT_LOCK, &gfs2_nondisk_glops, + LM_ST_EXCLUSIVE, + LM_FLAG_NOEXP | GL_NOCACHE | GL_NOPID, + mount_gh); + if (error) { + fs_err(sdp, "can't acquire mount glock: %d\n", error); + goto fail; + } + + error = gfs2_glock_nq_num(sdp, + GFS2_LIVE_LOCK, &gfs2_nondisk_glops, + LM_ST_SHARED, + LM_FLAG_NOEXP | GL_EXACT | GL_NOPID, + &sdp->sd_live_gh); + if (error) { + fs_err(sdp, "can't acquire live glock: %d\n", error); + goto fail_mount; + } + + error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops, + CREATE, &sdp->sd_rename_gl); + if (error) { + fs_err(sdp, "can't create rename glock: %d\n", error); + goto fail_live; + } + + error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops, + CREATE, &sdp->sd_freeze_gl); + if (error) { + fs_err(sdp, "can't create freeze glock: %d\n", error); + goto fail_rename; + } + + return 0; + +fail_trans: + gfs2_glock_put(sdp->sd_freeze_gl); +fail_rename: + gfs2_glock_put(sdp->sd_rename_gl); +fail_live: + gfs2_glock_dq_uninit(&sdp->sd_live_gh); +fail_mount: + gfs2_glock_dq_uninit(mount_gh); +fail: + return error; +} + +static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr, + u64 no_addr, const char *name) +{ + struct gfs2_sbd *sdp = sb->s_fs_info; + struct dentry *dentry; + struct inode *inode; + + inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, + GFS2_BLKST_FREE /* ignore */); + if (IS_ERR(inode)) { + fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode)); + return PTR_ERR(inode); + } + dentry = d_make_root(inode); + if (!dentry) { + fs_err(sdp, "can't alloc %s dentry\n", name); + return -ENOMEM; + } + *dptr = dentry; + return 0; +} + +static int init_sb(struct gfs2_sbd *sdp, int silent) +{ + struct super_block *sb = sdp->sd_vfs; + struct gfs2_holder sb_gh; + u64 no_addr; + int ret; + + ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops, + LM_ST_SHARED, 0, &sb_gh); + if (ret) { + fs_err(sdp, "can't acquire superblock glock: %d\n", ret); + return ret; + } + + ret = gfs2_read_sb(sdp, silent); + if (ret) { + fs_err(sdp, "can't read superblock: %d\n", ret); + goto out; + } + + switch(sdp->sd_sb.sb_fs_format) { + case GFS2_FS_FORMAT_MAX: + sb->s_xattr = gfs2_xattr_handlers_max; + break; + + case GFS2_FS_FORMAT_MIN: + sb->s_xattr = gfs2_xattr_handlers_min; + break; + + default: + BUG(); + } + + /* Set up the buffer cache and SB for real */ + if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) { + ret = -EINVAL; + fs_err(sdp, "FS block size (%u) is too small for device " + "block size (%u)\n", + sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev)); + goto out; + } + if (sdp->sd_sb.sb_bsize > PAGE_SIZE) { + ret = -EINVAL; + fs_err(sdp, "FS block size (%u) is too big for machine " + "page size (%u)\n", + sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE); + goto out; + } + sb_set_blocksize(sb, sdp->sd_sb.sb_bsize); + + /* Get the root inode */ + no_addr = sdp->sd_sb.sb_root_dir.no_addr; + ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root"); + if (ret) + goto out; + + /* Get the master inode */ + no_addr = sdp->sd_sb.sb_master_dir.no_addr; + ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master"); + if (ret) { + dput(sdp->sd_root_dir); + goto out; + } + sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir); +out: + gfs2_glock_dq_uninit(&sb_gh); + return ret; +} + +static void gfs2_others_may_mount(struct gfs2_sbd *sdp) +{ + char *message = "FIRSTMOUNT=Done"; + char *envp[] = { message, NULL }; + + fs_info(sdp, "first mount done, others may mount\n"); + + if (sdp->sd_lockstruct.ls_ops->lm_first_done) + sdp->sd_lockstruct.ls_ops->lm_first_done(sdp); + + kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp); +} + +/** + * gfs2_jindex_hold - Grab a lock on the jindex + * @sdp: The GFS2 superblock + * @ji_gh: the holder for the jindex glock + * + * Returns: errno + */ + +static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh) +{ + struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex); + struct qstr name; + char buf[20]; + struct gfs2_jdesc *jd; + int error; + + name.name = buf; + + mutex_lock(&sdp->sd_jindex_mutex); + + for (;;) { + struct gfs2_inode *jip; + + error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh); + if (error) + break; + + name.len = sprintf(buf, "journal%u", sdp->sd_journals); + name.hash = gfs2_disk_hash(name.name, name.len); + + error = gfs2_dir_check(sdp->sd_jindex, &name, NULL); + if (error == -ENOENT) { + error = 0; + break; + } + + gfs2_glock_dq_uninit(ji_gh); + + if (error) + break; + + error = -ENOMEM; + jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL); + if (!jd) + break; + + INIT_LIST_HEAD(&jd->extent_list); + INIT_LIST_HEAD(&jd->jd_revoke_list); + + INIT_WORK(&jd->jd_work, gfs2_recover_func); + jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1); + if (IS_ERR_OR_NULL(jd->jd_inode)) { + if (!jd->jd_inode) + error = -ENOENT; + else + error = PTR_ERR(jd->jd_inode); + kfree(jd); + break; + } + + d_mark_dontcache(jd->jd_inode); + spin_lock(&sdp->sd_jindex_spin); + jd->jd_jid = sdp->sd_journals++; + jip = GFS2_I(jd->jd_inode); + jd->jd_no_addr = jip->i_no_addr; + list_add_tail(&jd->jd_list, &sdp->sd_jindex_list); + spin_unlock(&sdp->sd_jindex_spin); + } + + mutex_unlock(&sdp->sd_jindex_mutex); + + return error; +} + +/** + * init_statfs - look up and initialize master and local (per node) statfs inodes + * @sdp: The GFS2 superblock + * + * This should be called after the jindex is initialized in init_journal() and + * before gfs2_journal_recovery() is called because we need to be able to write + * to these inodes during recovery. + * + * Returns: errno + */ +static int init_statfs(struct gfs2_sbd *sdp) +{ + int error = 0; + struct inode *master = d_inode(sdp->sd_master_dir); + struct inode *pn = NULL; + char buf[30]; + struct gfs2_jdesc *jd; + struct gfs2_inode *ip; + + sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs"); + if (IS_ERR(sdp->sd_statfs_inode)) { + error = PTR_ERR(sdp->sd_statfs_inode); + fs_err(sdp, "can't read in statfs inode: %d\n", error); + goto out; + } + if (sdp->sd_args.ar_spectator) + goto out; + + pn = gfs2_lookup_simple(master, "per_node"); + if (IS_ERR(pn)) { + error = PTR_ERR(pn); + fs_err(sdp, "can't find per_node directory: %d\n", error); + goto put_statfs; + } + + /* For each jid, lookup the corresponding local statfs inode in the + * per_node metafs directory and save it in the sdp->sd_sc_inodes_list. */ + list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { + struct local_statfs_inode *lsi = + kmalloc(sizeof(struct local_statfs_inode), GFP_NOFS); + if (!lsi) { + error = -ENOMEM; + goto free_local; + } + sprintf(buf, "statfs_change%u", jd->jd_jid); + lsi->si_sc_inode = gfs2_lookup_simple(pn, buf); + if (IS_ERR(lsi->si_sc_inode)) { + error = PTR_ERR(lsi->si_sc_inode); + fs_err(sdp, "can't find local \"sc\" file#%u: %d\n", + jd->jd_jid, error); + kfree(lsi); + goto free_local; + } + lsi->si_jid = jd->jd_jid; + if (jd->jd_jid == sdp->sd_jdesc->jd_jid) + sdp->sd_sc_inode = lsi->si_sc_inode; + + list_add_tail(&lsi->si_list, &sdp->sd_sc_inodes_list); + } + + iput(pn); + pn = NULL; + ip = GFS2_I(sdp->sd_sc_inode); + error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_NOPID, + &sdp->sd_sc_gh); + if (error) { + fs_err(sdp, "can't lock local \"sc\" file: %d\n", error); + goto free_local; + } + /* read in the local statfs buffer - other nodes don't change it. */ + error = gfs2_meta_inode_buffer(ip, &sdp->sd_sc_bh); + if (error) { + fs_err(sdp, "Cannot read in local statfs: %d\n", error); + goto unlock_sd_gh; + } + return 0; + +unlock_sd_gh: + gfs2_glock_dq_uninit(&sdp->sd_sc_gh); +free_local: + free_local_statfs_inodes(sdp); + iput(pn); +put_statfs: + iput(sdp->sd_statfs_inode); +out: + return error; +} + +/* Uninitialize and free up memory used by the list of statfs inodes */ +static void uninit_statfs(struct gfs2_sbd *sdp) +{ + if (!sdp->sd_args.ar_spectator) { + brelse(sdp->sd_sc_bh); + gfs2_glock_dq_uninit(&sdp->sd_sc_gh); + free_local_statfs_inodes(sdp); + } + iput(sdp->sd_statfs_inode); +} + +static int init_journal(struct gfs2_sbd *sdp, int undo) +{ + struct inode *master = d_inode(sdp->sd_master_dir); + struct gfs2_holder ji_gh; + struct gfs2_inode *ip; + int error = 0; + + gfs2_holder_mark_uninitialized(&ji_gh); + if (undo) + goto fail_statfs; + + sdp->sd_jindex = gfs2_lookup_simple(master, "jindex"); + if (IS_ERR(sdp->sd_jindex)) { + fs_err(sdp, "can't lookup journal index: %d\n", error); + return PTR_ERR(sdp->sd_jindex); + } + + /* Load in the journal index special file */ + + error = gfs2_jindex_hold(sdp, &ji_gh); + if (error) { + fs_err(sdp, "can't read journal index: %d\n", error); + goto fail; + } + + error = -EUSERS; + if (!gfs2_jindex_size(sdp)) { + fs_err(sdp, "no journals!\n"); + goto fail_jindex; + } + + atomic_set(&sdp->sd_log_blks_needed, 0); + if (sdp->sd_args.ar_spectator) { + sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0); + atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); + atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); + atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); + } else { + if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) { + fs_err(sdp, "can't mount journal #%u\n", + sdp->sd_lockstruct.ls_jid); + fs_err(sdp, "there are only %u journals (0 - %u)\n", + gfs2_jindex_size(sdp), + gfs2_jindex_size(sdp) - 1); + goto fail_jindex; + } + sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid); + + error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid, + &gfs2_journal_glops, + LM_ST_EXCLUSIVE, + LM_FLAG_NOEXP | GL_NOCACHE | GL_NOPID, + &sdp->sd_journal_gh); + if (error) { + fs_err(sdp, "can't acquire journal glock: %d\n", error); + goto fail_jindex; + } + + ip = GFS2_I(sdp->sd_jdesc->jd_inode); + sdp->sd_jinode_gl = ip->i_gl; + error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, + LM_FLAG_NOEXP | GL_EXACT | + GL_NOCACHE | GL_NOPID, + &sdp->sd_jinode_gh); + if (error) { + fs_err(sdp, "can't acquire journal inode glock: %d\n", + error); + goto fail_journal_gh; + } + + error = gfs2_jdesc_check(sdp->sd_jdesc); + if (error) { + fs_err(sdp, "my journal (%u) is bad: %d\n", + sdp->sd_jdesc->jd_jid, error); + goto fail_jinode_gh; + } + atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); + atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); + atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); + + /* Map the extents for this journal's blocks */ + gfs2_map_journal_extents(sdp, sdp->sd_jdesc); + } + trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free)); + + /* Lookup statfs inodes here so journal recovery can use them. */ + error = init_statfs(sdp); + if (error) + goto fail_jinode_gh; + + if (sdp->sd_lockstruct.ls_first) { + unsigned int x; + for (x = 0; x < sdp->sd_journals; x++) { + struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x); + + if (sdp->sd_args.ar_spectator) { + error = check_journal_clean(sdp, jd, true); + if (error) + goto fail_statfs; + continue; + } + error = gfs2_recover_journal(jd, true); + if (error) { + fs_err(sdp, "error recovering journal %u: %d\n", + x, error); + goto fail_statfs; + } + } + + gfs2_others_may_mount(sdp); + } else if (!sdp->sd_args.ar_spectator) { + error = gfs2_recover_journal(sdp->sd_jdesc, true); + if (error) { + fs_err(sdp, "error recovering my journal: %d\n", error); + goto fail_statfs; + } + } + + sdp->sd_log_idle = 1; + set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags); + gfs2_glock_dq_uninit(&ji_gh); + INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func); + return 0; + +fail_statfs: + uninit_statfs(sdp); +fail_jinode_gh: + /* A withdraw may have done dq/uninit so now we need to check it */ + if (!sdp->sd_args.ar_spectator && + gfs2_holder_initialized(&sdp->sd_jinode_gh)) + gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); +fail_journal_gh: + if (!sdp->sd_args.ar_spectator && + gfs2_holder_initialized(&sdp->sd_journal_gh)) + gfs2_glock_dq_uninit(&sdp->sd_journal_gh); +fail_jindex: + gfs2_jindex_free(sdp); + if (gfs2_holder_initialized(&ji_gh)) + gfs2_glock_dq_uninit(&ji_gh); +fail: + iput(sdp->sd_jindex); + return error; +} + +static struct lock_class_key gfs2_quota_imutex_key; + +static int init_inodes(struct gfs2_sbd *sdp, int undo) +{ + int error = 0; + struct inode *master = d_inode(sdp->sd_master_dir); + + if (undo) + goto fail_qinode; + + error = init_journal(sdp, undo); + complete_all(&sdp->sd_journal_ready); + if (error) + goto fail; + + /* Read in the resource index inode */ + sdp->sd_rindex = gfs2_lookup_simple(master, "rindex"); + if (IS_ERR(sdp->sd_rindex)) { + error = PTR_ERR(sdp->sd_rindex); + fs_err(sdp, "can't get resource index inode: %d\n", error); + goto fail_journal; + } + sdp->sd_rindex_uptodate = 0; + + /* Read in the quota inode */ + sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota"); + if (IS_ERR(sdp->sd_quota_inode)) { + error = PTR_ERR(sdp->sd_quota_inode); + fs_err(sdp, "can't get quota file inode: %d\n", error); + goto fail_rindex; + } + /* + * i_rwsem on quota files is special. Since this inode is hidden system + * file, we are safe to define locking ourselves. + */ + lockdep_set_class(&sdp->sd_quota_inode->i_rwsem, + &gfs2_quota_imutex_key); + + error = gfs2_rindex_update(sdp); + if (error) + goto fail_qinode; + + return 0; + +fail_qinode: + iput(sdp->sd_quota_inode); +fail_rindex: + gfs2_clear_rgrpd(sdp); + iput(sdp->sd_rindex); +fail_journal: + init_journal(sdp, UNDO); +fail: + return error; +} + +static int init_per_node(struct gfs2_sbd *sdp, int undo) +{ + struct inode *pn = NULL; + char buf[30]; + int error = 0; + struct gfs2_inode *ip; + struct inode *master = d_inode(sdp->sd_master_dir); + + if (sdp->sd_args.ar_spectator) + return 0; + + if (undo) + goto fail_qc_gh; + + pn = gfs2_lookup_simple(master, "per_node"); + if (IS_ERR(pn)) { + error = PTR_ERR(pn); + fs_err(sdp, "can't find per_node directory: %d\n", error); + return error; + } + + sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid); + sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf); + if (IS_ERR(sdp->sd_qc_inode)) { + error = PTR_ERR(sdp->sd_qc_inode); + fs_err(sdp, "can't find local \"qc\" file: %d\n", error); + goto fail_ut_i; + } + + iput(pn); + pn = NULL; + + ip = GFS2_I(sdp->sd_qc_inode); + error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_NOPID, + &sdp->sd_qc_gh); + if (error) { + fs_err(sdp, "can't lock local \"qc\" file: %d\n", error); + goto fail_qc_i; + } + + return 0; + +fail_qc_gh: + gfs2_glock_dq_uninit(&sdp->sd_qc_gh); +fail_qc_i: + iput(sdp->sd_qc_inode); +fail_ut_i: + iput(pn); + return error; +} + +static const match_table_t nolock_tokens = { + { Opt_jid, "jid=%d", }, + { Opt_err, NULL }, +}; + +static const struct lm_lockops nolock_ops = { + .lm_proto_name = "lock_nolock", + .lm_put_lock = gfs2_glock_free, + .lm_tokens = &nolock_tokens, +}; + +/** + * gfs2_lm_mount - mount a locking protocol + * @sdp: the filesystem + * @silent: if 1, don't complain if the FS isn't a GFS2 fs + * + * Returns: errno + */ + +static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent) +{ + const struct lm_lockops *lm; + struct lm_lockstruct *ls = &sdp->sd_lockstruct; + struct gfs2_args *args = &sdp->sd_args; + const char *proto = sdp->sd_proto_name; + const char *table = sdp->sd_table_name; + char *o, *options; + int ret; + + if (!strcmp("lock_nolock", proto)) { + lm = &nolock_ops; + sdp->sd_args.ar_localflocks = 1; +#ifdef CONFIG_GFS2_FS_LOCKING_DLM + } else if (!strcmp("lock_dlm", proto)) { + lm = &gfs2_dlm_ops; +#endif + } else { + pr_info("can't find protocol %s\n", proto); + return -ENOENT; + } + + fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table); + + ls->ls_ops = lm; + ls->ls_first = 1; + + for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) { + substring_t tmp[MAX_OPT_ARGS]; + int token, option; + + if (!o || !*o) + continue; + + token = match_token(o, *lm->lm_tokens, tmp); + switch (token) { + case Opt_jid: + ret = match_int(&tmp[0], &option); + if (ret || option < 0) + goto hostdata_error; + if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags)) + ls->ls_jid = option; + break; + case Opt_id: + case Opt_nodir: + /* Obsolete, but left for backward compat purposes */ + break; + case Opt_first: + ret = match_int(&tmp[0], &option); + if (ret || (option != 0 && option != 1)) + goto hostdata_error; + ls->ls_first = option; + break; + case Opt_err: + default: +hostdata_error: + fs_info(sdp, "unknown hostdata (%s)\n", o); + return -EINVAL; + } + } + + if (lm->lm_mount == NULL) { + fs_info(sdp, "Now mounting FS (format %u)...\n", sdp->sd_sb.sb_fs_format); + complete_all(&sdp->sd_locking_init); + return 0; + } + ret = lm->lm_mount(sdp, table); + if (ret == 0) + fs_info(sdp, "Joined cluster. Now mounting FS (format %u)...\n", + sdp->sd_sb.sb_fs_format); + complete_all(&sdp->sd_locking_init); + return ret; +} + +void gfs2_lm_unmount(struct gfs2_sbd *sdp) +{ + const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops; + if (likely(!gfs2_withdrawn(sdp)) && lm->lm_unmount) + lm->lm_unmount(sdp); +} + +static int wait_on_journal(struct gfs2_sbd *sdp) +{ + if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) + return 0; + + return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE) + ? -EINTR : 0; +} + +void gfs2_online_uevent(struct gfs2_sbd *sdp) +{ + struct super_block *sb = sdp->sd_vfs; + char ro[20]; + char spectator[20]; + char *envp[] = { ro, spectator, NULL }; + sprintf(ro, "RDONLY=%d", sb_rdonly(sb)); + sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); + kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp); +} + +static int init_threads(struct gfs2_sbd *sdp) +{ + struct task_struct *p; + int error = 0; + + p = kthread_create(gfs2_logd, sdp, "gfs2_logd/%s", sdp->sd_fsname); + if (IS_ERR(p)) { + error = PTR_ERR(p); + fs_err(sdp, "can't create logd thread: %d\n", error); + return error; + } + get_task_struct(p); + sdp->sd_logd_process = p; + + p = kthread_create(gfs2_quotad, sdp, "gfs2_quotad/%s", sdp->sd_fsname); + if (IS_ERR(p)) { + error = PTR_ERR(p); + fs_err(sdp, "can't create quotad thread: %d\n", error); + goto fail; + } + get_task_struct(p); + sdp->sd_quotad_process = p; + + wake_up_process(sdp->sd_logd_process); + wake_up_process(sdp->sd_quotad_process); + return 0; + +fail: + kthread_stop(sdp->sd_logd_process); + put_task_struct(sdp->sd_logd_process); + sdp->sd_logd_process = NULL; + return error; +} + +void gfs2_destroy_threads(struct gfs2_sbd *sdp) +{ + if (sdp->sd_logd_process) { + kthread_stop(sdp->sd_logd_process); + put_task_struct(sdp->sd_logd_process); + sdp->sd_logd_process = NULL; + } + if (sdp->sd_quotad_process) { + kthread_stop(sdp->sd_quotad_process); + put_task_struct(sdp->sd_quotad_process); + sdp->sd_quotad_process = NULL; + } +} + +/** + * gfs2_fill_super - Read in superblock + * @sb: The VFS superblock + * @fc: Mount options and flags + * + * Returns: -errno + */ +static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc) +{ + struct gfs2_args *args = fc->fs_private; + int silent = fc->sb_flags & SB_SILENT; + struct gfs2_sbd *sdp; + struct gfs2_holder mount_gh; + int error; + + sdp = init_sbd(sb); + if (!sdp) { + pr_warn("can't alloc struct gfs2_sbd\n"); + return -ENOMEM; + } + sdp->sd_args = *args; + + if (sdp->sd_args.ar_spectator) { + sb->s_flags |= SB_RDONLY; + set_bit(SDF_RORECOVERY, &sdp->sd_flags); + } + if (sdp->sd_args.ar_posix_acl) + sb->s_flags |= SB_POSIXACL; + if (sdp->sd_args.ar_nobarrier) + set_bit(SDF_NOBARRIERS, &sdp->sd_flags); + + sb->s_flags |= SB_NOSEC; + sb->s_magic = GFS2_MAGIC; + sb->s_op = &gfs2_super_ops; + sb->s_d_op = &gfs2_dops; + sb->s_export_op = &gfs2_export_ops; + sb->s_qcop = &gfs2_quotactl_ops; + sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; + sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE; + sb->s_time_gran = 1; + sb->s_maxbytes = MAX_LFS_FILESIZE; + + /* Set up the buffer cache and fill in some fake block size values + to allow us to read-in the on-disk superblock. */ + sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK); + sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits; + sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - + GFS2_BASIC_BLOCK_SHIFT; + sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift); + + sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit; + sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum; + if (sdp->sd_args.ar_statfs_quantum) { + sdp->sd_tune.gt_statfs_slow = 0; + sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum; + } else { + sdp->sd_tune.gt_statfs_slow = 1; + sdp->sd_tune.gt_statfs_quantum = 30; + } + + error = init_names(sdp, silent); + if (error) + goto fail_free; + + snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name); + + sdp->sd_delete_wq = alloc_workqueue("gfs2-delete/%s", + WQ_MEM_RECLAIM | WQ_FREEZABLE, 0, sdp->sd_fsname); + error = -ENOMEM; + if (!sdp->sd_delete_wq) + goto fail_free; + + error = gfs2_sys_fs_add(sdp); + if (error) + goto fail_delete_wq; + + gfs2_create_debugfs_file(sdp); + + error = gfs2_lm_mount(sdp, silent); + if (error) + goto fail_debug; + + error = init_locking(sdp, &mount_gh, DO); + if (error) + goto fail_lm; + + error = init_sb(sdp, silent); + if (error) + goto fail_locking; + + /* Turn rgrplvb on by default if fs format is recent enough */ + if (!sdp->sd_args.ar_got_rgrplvb && sdp->sd_sb.sb_fs_format > 1801) + sdp->sd_args.ar_rgrplvb = 1; + + error = wait_on_journal(sdp); + if (error) + goto fail_sb; + + /* + * If user space has failed to join the cluster or some similar + * failure has occurred, then the journal id will contain a + * negative (error) number. This will then be returned to the + * caller (of the mount syscall). We do this even for spectator + * mounts (which just write a jid of 0 to indicate "ok" even though + * the jid is unused in the spectator case) + */ + if (sdp->sd_lockstruct.ls_jid < 0) { + error = sdp->sd_lockstruct.ls_jid; + sdp->sd_lockstruct.ls_jid = 0; + goto fail_sb; + } + + if (sdp->sd_args.ar_spectator) + snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s", + sdp->sd_table_name); + else + snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u", + sdp->sd_table_name, sdp->sd_lockstruct.ls_jid); + + error = init_inodes(sdp, DO); + if (error) + goto fail_sb; + + error = init_per_node(sdp, DO); + if (error) + goto fail_inodes; + + error = gfs2_statfs_init(sdp); + if (error) { + fs_err(sdp, "can't initialize statfs subsystem: %d\n", error); + goto fail_per_node; + } + + if (!sb_rdonly(sb)) { + error = init_threads(sdp); + if (error) + goto fail_per_node; + } + + error = gfs2_freeze_lock_shared(sdp); + if (error) + goto fail_per_node; + + if (!sb_rdonly(sb)) + error = gfs2_make_fs_rw(sdp); + + if (error) { + gfs2_freeze_unlock(&sdp->sd_freeze_gh); + gfs2_destroy_threads(sdp); + fs_err(sdp, "can't make FS RW: %d\n", error); + goto fail_per_node; + } + gfs2_glock_dq_uninit(&mount_gh); + gfs2_online_uevent(sdp); + return 0; + +fail_per_node: + init_per_node(sdp, UNDO); +fail_inodes: + init_inodes(sdp, UNDO); +fail_sb: + if (sdp->sd_root_dir) + dput(sdp->sd_root_dir); + if (sdp->sd_master_dir) + dput(sdp->sd_master_dir); + if (sb->s_root) + dput(sb->s_root); + sb->s_root = NULL; +fail_locking: + init_locking(sdp, &mount_gh, UNDO); +fail_lm: + complete_all(&sdp->sd_journal_ready); + gfs2_gl_hash_clear(sdp); + gfs2_lm_unmount(sdp); +fail_debug: + gfs2_delete_debugfs_file(sdp); + gfs2_sys_fs_del(sdp); +fail_delete_wq: + destroy_workqueue(sdp->sd_delete_wq); +fail_free: + free_sbd(sdp); + sb->s_fs_info = NULL; + return error; +} + +/** + * gfs2_get_tree - Get the GFS2 superblock and root directory + * @fc: The filesystem context + * + * Returns: 0 or -errno on error + */ +static int gfs2_get_tree(struct fs_context *fc) +{ + struct gfs2_args *args = fc->fs_private; + struct gfs2_sbd *sdp; + int error; + + error = get_tree_bdev(fc, gfs2_fill_super); + if (error) + return error; + + sdp = fc->root->d_sb->s_fs_info; + dput(fc->root); + if (args->ar_meta) + fc->root = dget(sdp->sd_master_dir); + else + fc->root = dget(sdp->sd_root_dir); + return 0; +} + +static void gfs2_fc_free(struct fs_context *fc) +{ + struct gfs2_args *args = fc->fs_private; + + kfree(args); +} + +enum gfs2_param { + Opt_lockproto, + Opt_locktable, + Opt_hostdata, + Opt_spectator, + Opt_ignore_local_fs, + Opt_localflocks, + Opt_localcaching, + Opt_debug, + Opt_upgrade, + Opt_acl, + Opt_quota, + Opt_quota_flag, + Opt_suiddir, + Opt_data, + Opt_meta, + Opt_discard, + Opt_commit, + Opt_errors, + Opt_statfs_quantum, + Opt_statfs_percent, + Opt_quota_quantum, + Opt_barrier, + Opt_rgrplvb, + Opt_loccookie, +}; + +static const struct constant_table gfs2_param_quota[] = { + {"off", GFS2_QUOTA_OFF}, + {"account", GFS2_QUOTA_ACCOUNT}, + {"on", GFS2_QUOTA_ON}, + {"quiet", GFS2_QUOTA_QUIET}, + {} +}; + +enum opt_data { + Opt_data_writeback = GFS2_DATA_WRITEBACK, + Opt_data_ordered = GFS2_DATA_ORDERED, +}; + +static const struct constant_table gfs2_param_data[] = { + {"writeback", Opt_data_writeback }, + {"ordered", Opt_data_ordered }, + {} +}; + +enum opt_errors { + Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW, + Opt_errors_panic = GFS2_ERRORS_PANIC, +}; + +static const struct constant_table gfs2_param_errors[] = { + {"withdraw", Opt_errors_withdraw }, + {"panic", Opt_errors_panic }, + {} +}; + +static const struct fs_parameter_spec gfs2_fs_parameters[] = { + fsparam_string ("lockproto", Opt_lockproto), + fsparam_string ("locktable", Opt_locktable), + fsparam_string ("hostdata", Opt_hostdata), + fsparam_flag ("spectator", Opt_spectator), + fsparam_flag ("norecovery", Opt_spectator), + fsparam_flag ("ignore_local_fs", Opt_ignore_local_fs), + fsparam_flag ("localflocks", Opt_localflocks), + fsparam_flag ("localcaching", Opt_localcaching), + fsparam_flag_no("debug", Opt_debug), + fsparam_flag ("upgrade", Opt_upgrade), + fsparam_flag_no("acl", Opt_acl), + fsparam_flag_no("suiddir", Opt_suiddir), + fsparam_enum ("data", Opt_data, gfs2_param_data), + fsparam_flag ("meta", Opt_meta), + fsparam_flag_no("discard", Opt_discard), + fsparam_s32 ("commit", Opt_commit), + fsparam_enum ("errors", Opt_errors, gfs2_param_errors), + fsparam_s32 ("statfs_quantum", Opt_statfs_quantum), + fsparam_s32 ("statfs_percent", Opt_statfs_percent), + fsparam_s32 ("quota_quantum", Opt_quota_quantum), + fsparam_flag_no("barrier", Opt_barrier), + fsparam_flag_no("rgrplvb", Opt_rgrplvb), + fsparam_flag_no("loccookie", Opt_loccookie), + /* quota can be a flag or an enum so it gets special treatment */ + fsparam_flag_no("quota", Opt_quota_flag), + fsparam_enum("quota", Opt_quota, gfs2_param_quota), + {} +}; + +/* Parse a single mount parameter */ +static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param) +{ + struct gfs2_args *args = fc->fs_private; + struct fs_parse_result result; + int o; + + o = fs_parse(fc, gfs2_fs_parameters, param, &result); + if (o < 0) + return o; + + switch (o) { + case Opt_lockproto: + strscpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN); + break; + case Opt_locktable: + strscpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN); + break; + case Opt_hostdata: + strscpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN); + break; + case Opt_spectator: + args->ar_spectator = 1; + break; + case Opt_ignore_local_fs: + /* Retained for backwards compat only */ + break; + case Opt_localflocks: + args->ar_localflocks = 1; + break; + case Opt_localcaching: + /* Retained for backwards compat only */ + break; + case Opt_debug: + if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC) + return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive"); + args->ar_debug = result.boolean; + break; + case Opt_upgrade: + /* Retained for backwards compat only */ + break; + case Opt_acl: + args->ar_posix_acl = result.boolean; + break; + case Opt_quota_flag: + args->ar_quota = result.negated ? GFS2_QUOTA_OFF : GFS2_QUOTA_ON; + break; + case Opt_quota: + args->ar_quota = result.int_32; + break; + case Opt_suiddir: + args->ar_suiddir = result.boolean; + break; + case Opt_data: + /* The uint_32 result maps directly to GFS2_DATA_* */ + args->ar_data = result.uint_32; + break; + case Opt_meta: + args->ar_meta = 1; + break; + case Opt_discard: + args->ar_discard = result.boolean; + break; + case Opt_commit: + if (result.int_32 <= 0) + return invalfc(fc, "commit mount option requires a positive numeric argument"); + args->ar_commit = result.int_32; + break; + case Opt_statfs_quantum: + if (result.int_32 < 0) + return invalfc(fc, "statfs_quantum mount option requires a non-negative numeric argument"); + args->ar_statfs_quantum = result.int_32; + break; + case Opt_quota_quantum: + if (result.int_32 <= 0) + return invalfc(fc, "quota_quantum mount option requires a positive numeric argument"); + args->ar_quota_quantum = result.int_32; + break; + case Opt_statfs_percent: + if (result.int_32 < 0 || result.int_32 > 100) + return invalfc(fc, "statfs_percent mount option requires a numeric argument between 0 and 100"); + args->ar_statfs_percent = result.int_32; + break; + case Opt_errors: + if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC) + return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive"); + args->ar_errors = result.uint_32; + break; + case Opt_barrier: + args->ar_nobarrier = result.boolean; + break; + case Opt_rgrplvb: + args->ar_rgrplvb = result.boolean; + args->ar_got_rgrplvb = 1; + break; + case Opt_loccookie: + args->ar_loccookie = result.boolean; + break; + default: + return invalfc(fc, "invalid mount option: %s", param->key); + } + return 0; +} + +static int gfs2_reconfigure(struct fs_context *fc) +{ + struct super_block *sb = fc->root->d_sb; + struct gfs2_sbd *sdp = sb->s_fs_info; + struct gfs2_args *oldargs = &sdp->sd_args; + struct gfs2_args *newargs = fc->fs_private; + struct gfs2_tune *gt = &sdp->sd_tune; + int error = 0; + + sync_filesystem(sb); + + spin_lock(>->gt_spin); + oldargs->ar_commit = gt->gt_logd_secs; + oldargs->ar_quota_quantum = gt->gt_quota_quantum; + if (gt->gt_statfs_slow) + oldargs->ar_statfs_quantum = 0; + else + oldargs->ar_statfs_quantum = gt->gt_statfs_quantum; + spin_unlock(>->gt_spin); + + if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) { + errorfc(fc, "reconfiguration of locking protocol not allowed"); + return -EINVAL; + } + if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) { + errorfc(fc, "reconfiguration of lock table not allowed"); + return -EINVAL; + } + if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) { + errorfc(fc, "reconfiguration of host data not allowed"); + return -EINVAL; + } + if (newargs->ar_spectator != oldargs->ar_spectator) { + errorfc(fc, "reconfiguration of spectator mode not allowed"); + return -EINVAL; + } + if (newargs->ar_localflocks != oldargs->ar_localflocks) { + errorfc(fc, "reconfiguration of localflocks not allowed"); + return -EINVAL; + } + if (newargs->ar_meta != oldargs->ar_meta) { + errorfc(fc, "switching between gfs2 and gfs2meta not allowed"); + return -EINVAL; + } + if (oldargs->ar_spectator) + fc->sb_flags |= SB_RDONLY; + + if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) { + if (fc->sb_flags & SB_RDONLY) { + gfs2_make_fs_ro(sdp); + } else { + error = gfs2_make_fs_rw(sdp); + if (error) + errorfc(fc, "unable to remount read-write"); + } + } + sdp->sd_args = *newargs; + + if (sdp->sd_args.ar_posix_acl) + sb->s_flags |= SB_POSIXACL; + else + sb->s_flags &= ~SB_POSIXACL; + if (sdp->sd_args.ar_nobarrier) + set_bit(SDF_NOBARRIERS, &sdp->sd_flags); + else + clear_bit(SDF_NOBARRIERS, &sdp->sd_flags); + spin_lock(>->gt_spin); + gt->gt_logd_secs = newargs->ar_commit; + gt->gt_quota_quantum = newargs->ar_quota_quantum; + if (newargs->ar_statfs_quantum) { + gt->gt_statfs_slow = 0; + gt->gt_statfs_quantum = newargs->ar_statfs_quantum; + } + else { + gt->gt_statfs_slow = 1; + gt->gt_statfs_quantum = 30; + } + spin_unlock(>->gt_spin); + + gfs2_online_uevent(sdp); + return error; +} + +static const struct fs_context_operations gfs2_context_ops = { + .free = gfs2_fc_free, + .parse_param = gfs2_parse_param, + .get_tree = gfs2_get_tree, + .reconfigure = gfs2_reconfigure, +}; + +/* Set up the filesystem mount context */ +static int gfs2_init_fs_context(struct fs_context *fc) +{ + struct gfs2_args *args; + + args = kmalloc(sizeof(*args), GFP_KERNEL); + if (args == NULL) + return -ENOMEM; + + if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { + struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info; + + *args = sdp->sd_args; + } else { + memset(args, 0, sizeof(*args)); + args->ar_quota = GFS2_QUOTA_DEFAULT; + args->ar_data = GFS2_DATA_DEFAULT; + args->ar_commit = 30; + args->ar_statfs_quantum = 30; + args->ar_quota_quantum = 60; + args->ar_errors = GFS2_ERRORS_DEFAULT; + } + fc->fs_private = args; + fc->ops = &gfs2_context_ops; + return 0; +} + +static int set_meta_super(struct super_block *s, struct fs_context *fc) +{ + return -EINVAL; +} + +static int test_meta_super(struct super_block *s, struct fs_context *fc) +{ + return (fc->sget_key == s->s_bdev); +} + +static int gfs2_meta_get_tree(struct fs_context *fc) +{ + struct super_block *s; + struct gfs2_sbd *sdp; + struct path path; + int error; + + if (!fc->source || !*fc->source) + return -EINVAL; + + error = kern_path(fc->source, LOOKUP_FOLLOW, &path); + if (error) { + pr_warn("path_lookup on %s returned error %d\n", + fc->source, error); + return error; + } + fc->fs_type = &gfs2_fs_type; + fc->sget_key = path.dentry->d_sb->s_bdev; + s = sget_fc(fc, test_meta_super, set_meta_super); + path_put(&path); + if (IS_ERR(s)) { + pr_warn("gfs2 mount does not exist\n"); + return PTR_ERR(s); + } + if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) { + deactivate_locked_super(s); + return -EBUSY; + } + sdp = s->s_fs_info; + fc->root = dget(sdp->sd_master_dir); + return 0; +} + +static const struct fs_context_operations gfs2_meta_context_ops = { + .free = gfs2_fc_free, + .get_tree = gfs2_meta_get_tree, +}; + +static int gfs2_meta_init_fs_context(struct fs_context *fc) +{ + int ret = gfs2_init_fs_context(fc); + + if (ret) + return ret; + + fc->ops = &gfs2_meta_context_ops; + return 0; +} + +/** + * gfs2_evict_inodes - evict inodes cooperatively + * @sb: the superblock + * + * When evicting an inode with a zero link count, we are trying to upgrade the + * inode's iopen glock from SH to EX mode in order to determine if we can + * delete the inode. The other nodes are supposed to evict the inode from + * their caches if they can, and to poke the inode's inode glock if they cannot + * do so. Either behavior allows gfs2_upgrade_iopen_glock() to proceed + * quickly, but if the other nodes are not cooperating, the lock upgrading + * attempt will time out. Since inodes are evicted sequentially, this can add + * up quickly. + * + * Function evict_inodes() tries to keep the s_inode_list_lock list locked over + * a long time, which prevents other inodes from being evicted concurrently. + * This precludes the cooperative behavior we are looking for. This special + * version of evict_inodes() avoids that. + * + * Modeled after drop_pagecache_sb(). + */ +static void gfs2_evict_inodes(struct super_block *sb) +{ + struct inode *inode, *toput_inode = NULL; + struct gfs2_sbd *sdp = sb->s_fs_info; + + set_bit(SDF_EVICTING, &sdp->sd_flags); + + spin_lock(&sb->s_inode_list_lock); + list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { + spin_lock(&inode->i_lock); + if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) && + !need_resched()) { + spin_unlock(&inode->i_lock); + continue; + } + atomic_inc(&inode->i_count); + spin_unlock(&inode->i_lock); + spin_unlock(&sb->s_inode_list_lock); + + iput(toput_inode); + toput_inode = inode; + + cond_resched(); + spin_lock(&sb->s_inode_list_lock); + } + spin_unlock(&sb->s_inode_list_lock); + iput(toput_inode); +} + +static void gfs2_kill_sb(struct super_block *sb) +{ + struct gfs2_sbd *sdp = sb->s_fs_info; + + if (sdp == NULL) { + kill_block_super(sb); + return; + } + + gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB); + dput(sdp->sd_root_dir); + dput(sdp->sd_master_dir); + sdp->sd_root_dir = NULL; + sdp->sd_master_dir = NULL; + shrink_dcache_sb(sb); + + gfs2_evict_inodes(sb); + + /* + * Flush and then drain the delete workqueue here (via + * destroy_workqueue()) to ensure that any delete work that + * may be running will also see the SDF_KILL flag. + */ + set_bit(SDF_KILL, &sdp->sd_flags); + gfs2_flush_delete_work(sdp); + destroy_workqueue(sdp->sd_delete_wq); + + kill_block_super(sb); +} + +struct file_system_type gfs2_fs_type = { + .name = "gfs2", + .fs_flags = FS_REQUIRES_DEV, + .init_fs_context = gfs2_init_fs_context, + .parameters = gfs2_fs_parameters, + .kill_sb = gfs2_kill_sb, + .owner = THIS_MODULE, +}; +MODULE_ALIAS_FS("gfs2"); + +struct file_system_type gfs2meta_fs_type = { + .name = "gfs2meta", + .fs_flags = FS_REQUIRES_DEV, + .init_fs_context = gfs2_meta_init_fs_context, + .owner = THIS_MODULE, +}; +MODULE_ALIAS_FS("gfs2meta"); |