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xfs: sync lazy sb accounting on quiesce of read-only mounts 

xfs_log_sbcount() syncs the superblock specifically to accumulate
the in-core percpu superblock counters and commit them to disk. This
is required to maintain filesystem consistency across quiesce
(freeze, read-only mount/remount) or unmount when lazy superblock
accounting is enabled because individual transactions do not update
the superblock directly.

This mechanism works as expected for writable mounts, but
xfs_log_sbcount() skips the update for read-only mounts. Read-only
mounts otherwise still allow log recovery and write out an unmount
record during log quiesce. If a read-only mount performs log
recovery, it can modify the in-core superblock counters and write an
unmount record when the filesystem unmounts without ever syncing the
in-core counters. This leaves the filesystem with a clean log but in
an inconsistent state with regard to lazy sb counters.

Update xfs_log_sbcount() to use the same logic
xfs_log_unmount_write() uses to determine when to write an unmount
record. This ensures that lazy accounting is always synced before
the log is cleaned. Refactor this logic into a new helper to
distinguish between a writable filesystem and a writable log.
Specifically, the log is writable unless the filesystem is mounted
with the norecovery mount option, the underlying log device is
read-only, or the filesystem is shutdown. Drop the freeze state
check because the update is already allowed during the freezing
process and no context calls this function on an already frozen fs.
Also, retain the shutdown check in xfs_log_unmount_write() to catch
the case where the preceding log force might have triggered a
shutdown.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Gao Xiang <hsiangkao@redhat.com>
Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Bill O'Donnell <billodo@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
This commit is contained in:
Brian Foster 2021-01-22 16:48:20 -08:00 committed by Darrick J. Wong
parent 8aa921a953
commit 50d25484be
3 changed files with 22 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
fs/xfs/xfs_log.c
View File

@ -347,6 +347,25 @@ xlog_tic_add_region(xlog_ticket_t *tic, uint len, uint type)
tic->t_res_num++;
}
bool
xfs_log_writable(
struct xfs_mount *mp)
{
/*
* Never write to the log on norecovery mounts, if the block device is
* read-only, or if the filesystem is shutdown. Read-only mounts still
* allow internal writes for log recovery and unmount purposes, so don't
* restrict that case here.
*/
if (mp->m_flags & XFS_MOUNT_NORECOVERY)
return false;
if (xfs_readonly_buftarg(mp->m_log->l_targ))
return false;
if (XFS_FORCED_SHUTDOWN(mp))
return false;
return true;
}
/*
* Replenish the byte reservation required by moving the grant write head.
*/
@ -886,15 +905,8 @@ xfs_log_unmount_write(
{
struct xlog *log = mp->m_log;
/*
* Don't write out unmount record on norecovery mounts or ro devices.
* Or, if we are doing a forced umount (typically because of IO errors).
*/
if (mp->m_flags & XFS_MOUNT_NORECOVERY ||
xfs_readonly_buftarg(log->l_targ)) {
ASSERT(mp->m_flags & XFS_MOUNT_RDONLY);
if (!xfs_log_writable(mp))
return;
}
xfs_log_force(mp, XFS_LOG_SYNC);

1
fs/xfs/xfs_log.h
View File

@ -127,6 +127,7 @@ int xfs_log_reserve(struct xfs_mount *mp,
int xfs_log_regrant(struct xfs_mount *mp, struct xlog_ticket *tic);
void xfs_log_unmount(struct xfs_mount *mp);
int xfs_log_force_umount(struct xfs_mount *mp, int logerror);
bool xfs_log_writable(struct xfs_mount *mp);
struct xlog_ticket *xfs_log_ticket_get(struct xlog_ticket *ticket);
void xfs_log_ticket_put(struct xlog_ticket *ticket);

3
fs/xfs/xfs_mount.c
View File

@ -1176,8 +1176,7 @@ xfs_fs_writable(
int
xfs_log_sbcount(xfs_mount_t *mp)
{
/* allow this to proceed during the freeze sequence... */
if (!xfs_fs_writable(mp, SB_FREEZE_COMPLETE))
if (!xfs_log_writable(mp))
return 0;
/*