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| author | Dave Chinner <dchinner@redhat.com> | 2010-08-24 11:46:31 +1000 |
|---|---|---|
| committer | Dave Chinner <david@fromorbit.com> | 2010-08-24 11:46:31 +1000 |
| commit | 1a387d3be2b30c90f20d49a3497a8fc0693a9d18 (patch) | |
| tree | 4c8081f6620976dbfc3ecee0e26296c0890bceba /fs/xfs/xfs_fsops.h | |
| parent | 2fe33661fcd79d4c53022509f7223d526b5fa233 (diff) | |
| download | linux-1a387d3be2b30c90f20d49a3497a8fc0693a9d18.tar.bz2 | |
xfs: dummy transactions should not dirty VFS state
When we need to cover the log, we issue dummy transactions to ensure
the current log tail is on disk. Unfortunately we currently use the
root inode in the dummy transaction, and the act of committing the
transaction dirties the inode at the VFS level.
As a result, the VFS writeback of the dirty inode will prevent the
filesystem from idling long enough for the log covering state
machine to complete. The state machine gets stuck in a loop issuing
new dummy transactions to cover the log and never makes progress.
To avoid this problem, the dummy transactions should not cause
externally visible state changes. To ensure this occurs, make sure
that dummy transactions log an unchanging field in the superblock as
it's state is never propagated outside the filesystem. This allows
the log covering state machine to complete successfully and the
filesystem now correctly enters a fully idle state about 90s after
the last modification was made.
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/xfs/xfs_fsops.h')
| -rw-r--r-- | fs/xfs/xfs_fsops.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/xfs/xfs_fsops.h b/fs/xfs/xfs_fsops.h index 88435e0a77c9..a786c5212c1e 100644 --- a/fs/xfs/xfs_fsops.h +++ b/fs/xfs/xfs_fsops.h @@ -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); +extern int xfs_fs_log_dummy(xfs_mount_t *mp, int flags); #endif /* __XFS_FSOPS_H__ */ |