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xfs: rationalise xfs_mount_wq users 

Instead of starting and stopping background work on the xfs_mount_wq
all at the same time, separate them to where they really are needed
to start and stop.

The xfs_sync_worker, only needs to be started after all the mount
processing has completed successfully, while it needs to be stopped
before the log is unmounted.

The xfs_reclaim_worker is started on demand, and can be
stopped before the unmount process does it's own inode reclaim pass.

The xfs_flush_inodes work is run on demand, and so we really only
need to ensure that it has stopped running before we start
processing an unmount, freeze or remount,ro.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Dave Chinner 2012-10-08 21:56:00 +11:00 committed by Ben Myers
parent 33c7a2bc48
commit 7e18530bef
3 changed files with 24 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
fs/xfs/xfs_mount.c
View File

@ -1450,9 +1450,11 @@ xfs_unmountfs(
/*
* And reclaim all inodes. At this point there should be no dirty
* inode, and none should be pinned or locked, but use synchronous
* reclaim just to be sure.
* inodes and none should be pinned or locked, but use synchronous
* reclaim just to be sure. We can stop background inode reclaim
* here as well if it is still running.
*/
cancel_delayed_work_sync(&mp->m_reclaim_work);
xfs_reclaim_inodes(mp, SYNC_WAIT);
xfs_qm_unmount(mp);

36
fs/xfs/xfs_super.c
View File

@ -1005,14 +1005,12 @@ xfs_fs_put_super(
{
struct xfs_mount *mp = XFS_M(sb);
xfs_filestream_unmount(mp);
cancel_delayed_work_sync(&mp->m_sync_work);
xfs_unmountfs(mp);
cancel_delayed_work_sync(&mp->m_sync_work);
cancel_delayed_work_sync(&mp->m_reclaim_work);
cancel_work_sync(&mp->m_flush_work);
xfs_filestream_unmount(mp);
xfs_unmountfs(mp);
xfs_freesb(mp);
xfs_icsb_destroy_counters(mp);
xfs_destroy_mount_workqueues(mp);
@ -1325,6 +1323,9 @@ xfs_fs_fill_super(
spin_lock_init(&mp->m_sb_lock);
mutex_init(&mp->m_growlock);
atomic_set(&mp->m_active_trans, 0);
INIT_WORK(&mp->m_flush_work, xfs_flush_worker);
INIT_DELAYED_WORK(&mp->m_sync_work, xfs_sync_worker);
INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
mp->m_super = sb;
sb->s_fs_info = mp;
@ -1388,15 +1389,9 @@ xfs_fs_fill_super(
sb->s_time_gran = 1;
set_posix_acl_flag(sb);
INIT_WORK(&mp->m_flush_work, xfs_flush_worker);
INIT_DELAYED_WORK(&mp->m_sync_work, xfs_sync_worker);
INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
xfs_syncd_queue_sync(mp);
error = xfs_mountfs(mp);
if (error)
goto out_syncd_stop;
goto out_filestream_unmount;
root = igrab(VFS_I(mp->m_rootip));
if (!root) {
@ -1413,12 +1408,15 @@ xfs_fs_fill_super(
goto out_unmount;
}
return 0;
out_syncd_stop:
cancel_delayed_work_sync(&mp->m_sync_work);
cancel_delayed_work_sync(&mp->m_reclaim_work);
cancel_work_sync(&mp->m_flush_work);
/*
* The filesystem is successfully mounted, so we can start background
* sync work now.
*/
xfs_syncd_queue_sync(mp);
return 0;
out_filestream_unmount:
xfs_filestream_unmount(mp);
out_free_sb:
xfs_freesb(mp);
@ -1437,10 +1435,6 @@ out_destroy_workqueues:
out_unmount:
xfs_filestream_unmount(mp);
xfs_unmountfs(mp);
cancel_delayed_work_sync(&mp->m_sync_work);
cancel_delayed_work_sync(&mp->m_reclaim_work);
cancel_work_sync(&mp->m_flush_work);
goto out_free_sb;
}

21
fs/xfs/xfs_sync.c
View File

@ -379,9 +379,9 @@ xfs_syncd_queue_sync(
}
/*
* Every sync period we need to unpin all items, reclaim inodes and sync
* disk quotas. We might need to cover the log to indicate that the
* filesystem is idle and not frozen.
* Every sync period we need to unpin all items in the AIL and push them to
* disk. If there is nothing dirty, then we might need to cover the log to
* indicate that the filesystem is idle and not frozen.
*/
void
xfs_sync_worker(
@ -391,17 +391,7 @@ xfs_sync_worker(
struct xfs_mount, m_sync_work);
int error;
/*
* 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 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 (!(mp->m_super->s_flags & MS_ACTIVE) &&
!(mp->m_flags & XFS_MOUNT_RDONLY)) {
if (!(mp->m_flags & XFS_MOUNT_RDONLY)) {
/* dgc: errors ignored here */
if (mp->m_super->s_writers.frozen == SB_UNFROZEN &&
xfs_log_need_covered(mp))
@ -409,8 +399,7 @@ xfs_sync_worker(
else
xfs_log_force(mp, 0);
/* start pushing all the metadata that is currently
* dirty */
/* start pushing all the metadata that is currently dirty */
xfs_ail_push_all(mp->m_ail);
}