Hi,
* On Tue, May 08, 2012 at 09:53:21AM +1000, Dave Chinner <david@xxxxxxxxxxxxx>
wrote:
On Mon, May 07, 2012 at 02:44:07PM +0530, raghu.prabhu13@xxxxxxxxx wrote:
From: Raghavendra D Prabhu <rprabhu@xxxxxxxxxxx>
This is to prevent syncing from running ad-infinitum till umount if the disk
has been forcefully unplugged.
This is to prevent messages like these from being displayed.
.....
---
fs/xfs/xfs_sync.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/fs/xfs/xfs_sync.c b/fs/xfs/xfs_sync.c
index 205ebcb..7ec412c 100644
--- a/fs/xfs/xfs_sync.c
+++ b/fs/xfs/xfs_sync.c
@@ -460,6 +460,12 @@ xfs_sync_worker(
struct xfs_mount, m_sync_work);
int error;
+ if (!xfs_fs_writable(mp)) {
+ xfs_err(mp, "Filesystem not writable / already shutdown.");
+ xfs_syncd_stop(mp);
+ return;
+ }
+
That is going to kill the xfssyncd on read only and frozen
filesystems as well as shutdowns, so this is certainly not correct.
The xfs_sync_worker should continue to run until the filesystem is
unmounted, even if it does nothing when it runs.
Yes, in the next patch I had sent --
http://article.gmane.org/gmane.comp.file-systems.xfs.general/45568
-- I removed xfs_syncd_stop from there and added it under
xfs_bwrite.
(PS: Adding xfs_syncd_stop in xfs_sync_worker was a very
bad decision - it sent few of my kworkers to 'D' state and nearly
corrupted that fs)
Indeed, all that is needed in xfs_sync_worker() is this:
- if (!(mp->m_flags & XFS_MOUNT_RDONLY)) {
+ if (!xfs_fs_writable(mp)) {
and the error message won't appear. It fixes the problem for the
shutdown case, as well as handles frozen and read-only filesystems
correctly.
I realized from your earlier comment that, calling
xfs_syncd_stop under xfs_bwrite won't be good either;
so I was thinking of just checking for
XFS_FORCED_SHUTDOWN(mp) in xfs_log_force and bailing out
if already shutdown.
which should take care of xfs_sync_worker,
xfs_flush_worker, xfs_iflush and xfs_unmountfs
Does this sound good?
/* dgc: errors ignored here */
if (mp->m_super->s_frozen == SB_UNFROZEN &&
@@ -551,6 +557,12 @@ xfs_flush_worker(
struct xfs_mount *mp = container_of(work,
struct xfs_mount, m_flush_work);
+ if (!xfs_fs_writable(mp)) {
+ xfs_err(mp, "Filesystem not writable / already shutdown.");
+ xfs_syncd_stop(mp);
+ return;
+ }
+
xfs_sync_data(mp, SYNC_TRYLOCK);
xfs_sync_data(mp, SYNC_TRYLOCK | SYNC_WAIT);
This is not necessary, either, because xfs_sync_data() has shutdown
checks and xfs_flush_worker() should never be called on a shutdown
filesystem....
Yeah, I realized that (sent a patch after this
http://article.gmane.org/gmane.comp.file-systems.xfs.general/45568).
Cheers,
Dave.
--
Dave Chinner
david@xxxxxxxxxxxxx
Regards,
--
Raghavendra Prabhu
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