diff options
| author | Jeff Mahoney <jeffm@suse.com> | 2015-06-15 15:41:18 +0200 |
|---|---|---|
| committer | Chris Mason <clm@fb.com> | 2015-07-29 17:15:27 +0200 |
| commit | e44163e177960ee60e32a73bffdd53c3a5827406 (patch) | |
| tree | ffc55e93df052f4077f70ca996f2147dbb940237 /fs/btrfs | |
| parent | btrfs: iterate over unused chunk space in FITRIM (diff) | |
| download | linux-e44163e177960ee60e32a73bffdd53c3a5827406.tar.xz linux-e44163e177960ee60e32a73bffdd53c3a5827406.zip | |
btrfs: explictly delete unused block groups in close_ctree and ro-remount
The cleaner thread may already be sleeping by the time we enter
close_ctree. If that's the case, we'll skip removing any unused
block groups queued for removal, even during a normal umount.
They'll be cleaned up automatically at next mount, but users
expect a umount to be a clean synchronization point, especially
when used on thin-provisioned storage with -odiscard. We also
explicitly remove unused block groups in the ro-remount path
for the same reason.
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Tested-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs/btrfs')
| -rw-r--r-- | fs/btrfs/disk-io.c | 9 | ||||
| -rw-r--r-- | fs/btrfs/super.c | 11 |
2 files changed, 20 insertions, 0 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 84cbbb2d562e..053109ba26b7 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -3767,6 +3767,15 @@ void close_ctree(struct btrfs_root *root) cancel_work_sync(&fs_info->async_reclaim_work); if (!(fs_info->sb->s_flags & MS_RDONLY)) { + /* + * If the cleaner thread is stopped and there are + * block groups queued for removal, the deletion will be + * skipped when we quit the cleaner thread. + */ + mutex_lock(&root->fs_info->cleaner_mutex); + btrfs_delete_unused_bgs(root->fs_info); + mutex_unlock(&root->fs_info->cleaner_mutex); + ret = btrfs_commit_super(root); if (ret) btrfs_err(fs_info, "commit super ret %d", ret); diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index cd7ef34d2dce..a1077e0ffaa8 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -1650,6 +1650,17 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data) sb->s_flags |= MS_RDONLY; + /* + * Setting MS_RDONLY will put the cleaner thread to + * sleep at the next loop if it's already active. + * If it's already asleep, we'll leave unused block + * groups on disk until we're mounted read-write again + * unless we clean them up here. + */ + mutex_lock(&root->fs_info->cleaner_mutex); + btrfs_delete_unused_bgs(fs_info); + mutex_unlock(&root->fs_info->cleaner_mutex); + btrfs_dev_replace_suspend_for_unmount(fs_info); btrfs_scrub_cancel(fs_info); btrfs_pause_balance(fs_info); |