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xfs: remove leftover CoW reservations when remounting ro 

When we're remounting the filesystem readonly, remove all CoW
preallocations prior to going ro.  If the fs goes down after the ro
remount, we never clean up the staging extents, which means xfs_check
will trip over them on a subsequent run.  Practically speaking, the next
mount will clean them up too, so this is unlikely to be seen.  Since we
shut down the cowblocks cleaner on remount-ro, we also have to make sure
we start it back up if/when we remount-rw.

Found by adding clonerange to fsstress and running xfs/017.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2017-12-14 15:46:05 -08:00
parent 363e59baa4
commit 10ddf64e42
3 changed files with 11 additions and 1 deletions
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2
fs/xfs/xfs_icache.c
View File

@ -870,7 +870,7 @@ xfs_eofblocks_worker(
* based on the 'speculative_cow_prealloc_lifetime' tunable (5m by default).
* (We'll just piggyback on the post-EOF prealloc space workqueue.)
*/
STATIC void
void
xfs_queue_cowblocks(
struct xfs_mount *mp)
{

1
fs/xfs/xfs_icache.h
View File

@ -81,6 +81,7 @@ void xfs_inode_clear_cowblocks_tag(struct xfs_inode *ip);
int xfs_icache_free_cowblocks(struct xfs_mount *, struct xfs_eofblocks *);
int xfs_inode_free_quota_cowblocks(struct xfs_inode *ip);
void xfs_cowblocks_worker(struct work_struct *);
void xfs_queue_cowblocks(struct xfs_mount *);
int xfs_inode_ag_iterator(struct xfs_mount *mp,
int (*execute)(struct xfs_inode *ip, int flags, void *args),

9
fs/xfs/xfs_super.c
View File

@ -1360,6 +1360,7 @@ xfs_fs_remount(
xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
return error;
}
xfs_queue_cowblocks(mp);
/* Create the per-AG metadata reservation pool .*/
error = xfs_fs_reserve_ag_blocks(mp);
@ -1369,6 +1370,14 @@ xfs_fs_remount(
/* rw -> ro */
if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) {
/* Get rid of any leftover CoW reservations... */
cancel_delayed_work_sync(&mp->m_cowblocks_work);
error = xfs_icache_free_cowblocks(mp, NULL);
if (error) {
xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
return error;
}
/* Free the per-AG metadata reservation pool. */
error = xfs_fs_unreserve_ag_blocks(mp);
if (error) {