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xfs: ensure log covering transactions are synchronous 

To ensure the log is covered and the filesystem idles correctly, we
need to ensure that dummy transactions hit the disk and do not stay
pinned in memory.  If the superblock is pinned in memory, it can't
be flushed so the log covering cannot make progress. The result is
dependent on timing - more oftent han not we continue to issues a
log covering transaction every 36s rather than idling after ~90s.

Fix this by making the log covering transaction synchronous. To
avoid additional log force from xfssyncd, make the log covering
transaction take the place of the existing log force in the xfssyncd
background sync process.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Dave Chinner 2011-01-04 04:49:29 +00:00 committed by Alex Elder
parent eda7798272
commit c58efdb442
4 changed files with 13 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/xfs/linux-2.6/xfs_super.c
View File

@ -1413,7 +1413,7 @@ xfs_fs_freeze(
xfs_save_resvblks(mp);
xfs_quiesce_attr(mp);
return -xfs_fs_log_dummy(mp, SYNC_WAIT);
return -xfs_fs_log_dummy(mp);
}
STATIC int

11
fs/xfs/linux-2.6/xfs_sync.c
View File

@ -362,7 +362,7 @@ xfs_quiesce_data(
/* mark the log as covered if needed */
if (xfs_log_need_covered(mp))
error2 = xfs_fs_log_dummy(mp, SYNC_WAIT);
error2 = xfs_fs_log_dummy(mp);
/* flush data-only devices */
if (mp->m_rtdev_targp)
@ -503,13 +503,14 @@ xfs_sync_worker(
int error;
if (!(mp->m_flags & XFS_MOUNT_RDONLY)) {
xfs_log_force(mp, 0);
xfs_reclaim_inodes(mp, 0);
/* dgc: errors ignored here */
error = xfs_qm_sync(mp, SYNC_TRYLOCK);
if (mp->m_super->s_frozen == SB_UNFROZEN &&
xfs_log_need_covered(mp))
error = xfs_fs_log_dummy(mp, 0);
error = xfs_fs_log_dummy(mp);
else
xfs_log_force(mp, 0);
xfs_reclaim_inodes(mp, 0);
error = xfs_qm_sync(mp, SYNC_TRYLOCK);
}
mp->m_sync_seq++;
wake_up(&mp->m_wait_single_sync_task);

10
fs/xfs/xfs_fsops.c
View File

@ -612,12 +612,13 @@ out:
*
* We cannot use an inode here for this - that will push dirty state back up
* into the VFS and then periodic inode flushing will prevent log covering from
* making progress. Hence we log a field in the superblock instead.
* making progress. Hence we log a field in the superblock instead and use a
* synchronous transaction to ensure the superblock is immediately unpinned
* and can be written back.
*/
int
xfs_fs_log_dummy(
xfs_mount_t *mp,
int flags)
xfs_mount_t *mp)
{
xfs_trans_t *tp;
int error;
@ -632,8 +633,7 @@ xfs_fs_log_dummy(
/* log the UUID because it is an unchanging field */
xfs_mod_sb(tp, XFS_SB_UUID);
if (flags & SYNC_WAIT)
xfs_trans_set_sync(tp);
xfs_trans_set_sync(tp);
return xfs_trans_commit(tp, 0);
}

2
fs/xfs/xfs_fsops.h
View File

@ -25,6 +25,6 @@ extern int xfs_fs_counts(xfs_mount_t *mp, xfs_fsop_counts_t *cnt);
extern int xfs_reserve_blocks(xfs_mount_t *mp, __uint64_t *inval,
xfs_fsop_resblks_t *outval);
extern int xfs_fs_goingdown(xfs_mount_t *mp, __uint32_t inflags);
extern int xfs_fs_log_dummy(xfs_mount_t *mp, int flags);
extern int xfs_fs_log_dummy(struct xfs_mount *mp);
#endif /* __XFS_FSOPS_H__ */