From 91ee575f2b35d1307412f917787195c2f6a38dfb Mon Sep 17 00:00:00 2001 From: Brian Foster Date: Fri, 28 Nov 2014 14:02:59 +1100 Subject: [PATCH] xfs: allow lazy sb counter sync during filesystem freeze sequence The expectation since the introduction the lazy superblock counters is that the counters are synced and superblock logged appropriately as part of the filesystem freeze sequence. This does not occur, however, due to the logic in xfs_fs_writable() that prevents progress when the fs is in any state other than SB_UNFROZEN. While this is a bug, it has not been exposed to date because the last thing XFS does during freeze is dirty the log. The log recovery process recalculates the counters from AGI/AGF metadata to ensure everything is correct. Therefore should a crash occur while an fs is frozen, the subsequent log recovery puts everything back in order. See the following commit for reference: 92821e2b [XFS] Lazy Superblock Counters We might not always want to rely on dirtying the log on a frozen fs. Modify xfs_log_sbcount() to proceed when the filesystem is freezing but not once the freeze process has completed. Modify xfs_fs_writable() to accept the minimum freeze level for which modifications should be blocked to support various codepaths. Signed-off-by: Brian Foster Reviewed-by: Dave Chinner Signed-off-by: Dave Chinner --- fs/xfs/xfs_log.c | 2 +- fs/xfs/xfs_mount.c | 29 +++++++++++++++++++++-------- fs/xfs/xfs_mount.h | 2 +- 3 files changed, 23 insertions(+), 10 deletions(-) diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c index fe88ef6..e810e9d 100644 --- a/fs/xfs/xfs_log.c +++ b/fs/xfs/xfs_log.c @@ -1031,7 +1031,7 @@ xfs_log_need_covered(xfs_mount_t *mp) struct xlog *log = mp->m_log; int needed = 0; - if (!xfs_fs_writable(mp)) + if (!xfs_fs_writable(mp, SB_FREEZE_WRITE)) return 0; if (!xlog_cil_empty(log)) diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c index 51435db..13d1170 100644 --- a/fs/xfs/xfs_mount.c +++ b/fs/xfs/xfs_mount.c @@ -1074,11 +1074,23 @@ xfs_unmountfs( xfs_sysfs_del(&mp->m_kobj); } -int -xfs_fs_writable(xfs_mount_t *mp) +/* + * Determine whether modifications can proceed. The caller specifies the minimum + * freeze level for which modifications should not be allowed. This allows + * certain operations to proceed while the freeze sequence is in progress, if + * necessary. + */ +bool +xfs_fs_writable( + struct xfs_mount *mp, + int level) { - return !(mp->m_super->s_writers.frozen || XFS_FORCED_SHUTDOWN(mp) || - (mp->m_flags & XFS_MOUNT_RDONLY)); + ASSERT(level > SB_UNFROZEN); + if ((mp->m_super->s_writers.frozen >= level) || + XFS_FORCED_SHUTDOWN(mp) || (mp->m_flags & XFS_MOUNT_RDONLY)) + return false; + + return true; } /* @@ -1086,9 +1098,9 @@ xfs_fs_writable(xfs_mount_t *mp) * * Sync the superblock counters to disk. * - * Note this code can be called during the process of freezing, so - * we may need to use the transaction allocator which does not - * block when the transaction subsystem is in its frozen state. + * Note this code can be called during the process of freezing, so we use the + * transaction allocator that does not block when the transaction subsystem is + * in its frozen state. */ int xfs_log_sbcount(xfs_mount_t *mp) @@ -1096,7 +1108,8 @@ xfs_log_sbcount(xfs_mount_t *mp) xfs_trans_t *tp; int error; - if (!xfs_fs_writable(mp)) + /* allow this to proceed during the freeze sequence... */ + if (!xfs_fs_writable(mp, SB_FREEZE_COMPLETE)) return 0; xfs_icsb_sync_counters(mp, 0); diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h index 394bc71..01fb28f 100644 --- a/fs/xfs/xfs_mount.h +++ b/fs/xfs/xfs_mount.h @@ -385,7 +385,7 @@ extern int xfs_mount_log_sb(xfs_mount_t *, __int64_t); extern struct xfs_buf *xfs_getsb(xfs_mount_t *, int); extern int xfs_readsb(xfs_mount_t *, int); extern void xfs_freesb(xfs_mount_t *); -extern int xfs_fs_writable(xfs_mount_t *); +extern bool xfs_fs_writable(struct xfs_mount *mp, int level); extern int xfs_sb_validate_fsb_count(struct xfs_sb *, __uint64_t); extern int xfs_dev_is_read_only(struct xfs_mount *, char *); -- 2.7.4