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authorDave Chinner <dchinner@redhat.com>2011-01-04 04:49:29 +0000
committerAlex Elder <aelder@sgi.com>2011-01-11 20:28:17 -0600
commitc58efdb442bb49dea1d148f207560c41918c1bf4 (patch)
treed6e117ae65ff7ff921600ef936a7bbb4e3130010 /fs/xfs/xfs_fsops.c
parenteda77982729b7170bdc9e8855f0682edf322d277 (diff)
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>
Diffstat (limited to 'fs/xfs/xfs_fsops.c')
-rw-r--r--fs/xfs/xfs_fsops.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index f56d30e8040..cec89dd5d7d 100644
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -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);
}