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xfs: shutdown xfs_sync_worker before the log

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Revert commit 1307bbd, which uses the s_umount semaphore to provide
exclusion between xfs_sync_worker and unmount, in favor of shutting down
the sync worker before freeing the log in xfs_log_unmount.  This is a
cleaner way of resolving the race between xfs_sync_worker and unmount
than using s_umount.

Signed-off-by: Ben Myers <bpm@sgi.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Ben Myers 2012-05-25 15:45:36 -05:00
parent 59c84ed0dd
commit 8866fc6fa5
2 changed files with 16 additions and 15 deletions
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1
fs/xfs/xfs_log.c
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@ -810,6 +810,7 @@ xfs_log_unmount_write(xfs_mount_t *mp)
void
xfs_log_unmount(xfs_mount_t *mp)
{
cancel_delayed_work_sync(&mp->m_sync_work);
xfs_trans_ail_destroy(mp);
xlog_dealloc_log(mp->m_log);
}

12
fs/xfs/xfs_sync.c
View file

@ -386,11 +386,13 @@ xfs_sync_worker(
* We shouldn't write/force the log if we are in the mount/unmount
* process or on a read only filesystem. The workqueue still needs to be
* active in both cases, however, because it is used for inode reclaim
* during these times. Use the s_umount semaphore to provide exclusion
* with unmount.
* during these times. Use the MS_ACTIVE flag to avoid doing anything
* during mount. Doing work during unmount is avoided by calling
* cancel_delayed_work_sync on this work queue before tearing down
* the ail and the log in xfs_log_unmount.
*/
if (down_read_trylock(&mp->m_super->s_umount)) {
if (!(mp->m_flags & XFS_MOUNT_RDONLY)) {
if (!(mp->m_super->s_flags & MS_ACTIVE) &&
!(mp->m_flags & XFS_MOUNT_RDONLY)) {
/* dgc: errors ignored here */
if (mp->m_super->s_frozen == SB_UNFROZEN &&
xfs_log_need_covered(mp))
@ -402,8 +404,6 @@ xfs_sync_worker(
* dirty */
xfs_ail_push_all(mp->m_ail);
}
up_read(&mp->m_super->s_umount);
}
/* queue us up again */
xfs_syncd_queue_sync(mp);