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.
==========================================
[ 3816.416570] XFS (sdb3): xfs_do_force_shutdown(0x1) called from line 1031 of file fs/xfs/xfs_buf.c. Return address = 0xffffffff8127c13a
[ 3816.416586] XFS (sdb3): I/O Error Detected. Shutting down filesystem
[ 3816.416592] XFS (sdb3): Please umount the filesystem and rectify the problem(s)
[ 3842.941953] XFS (sdb3): xfs_log_force: error 5 returned.
[ 3873.009329] XFS (sdb3): xfs_log_force: error 5 returned.
[ 3878.913310] XFS (sdb3): xfs_log_force: error 5 returned.
[ 3878.913322] XFS (sdb3): xfs_do_force_shutdown(0x1) called from line 1031 of file fs/xfs/xfs_buf.c. Return address = 0xffffffff8127c13a
[ 3878.913350] XFS (sdb3): xfs_log_force: error 5 returned.
[ 3878.913362] XFS (sdb3): xfs_log_force: error 5 returned.
===========================================
Note, that even after xfs_do_force_shutdown has been called, xfs_log_force
doesn't stop till the filesystem has been unmounted (and it keeps printing
"error 5 returned" to kernel log).
To simulate it, mount an xfs filesystem located on external disk, and then pull
the power to the disk (non-usb powered disk).
Tested it on latest linus tree.
Now, the kernel log looks,
[ 2477.305280] XFS (sdc3): xfs_do_force_shutdown(0x1) called from line 1031 of file fs/xfs/xfs_buf.c. Return address = 0xffffffff8127c13a
[ 2477.305295] XFS (sdc3): I/O Error Detected. Shutting down filesystem
[ 2477.305300] XFS (sdc3): Please umount the filesystem and rectify the problem(s)
[ 2477.305588] XFS (sdc2): xfs_do_force_shutdown(0x1) called from line 1031 of file fs/xfs/xfs_buf.c. Return address = 0xffffffff8127c13a
[ 2477.305600] XFS (sdc2): I/O Error Detected. Shutting down filesystem
[ 2477.305604] XFS (sdc2): Please umount the filesystem and rectify the problem(s)
[ 2487.810718] XFS (sdc3): xfs_log_force: error 5 returned.
[ 2487.810729] XFS (sdc3): xfs_do_force_shutdown(0x1) called from line 1031 of file fs/xfs/xfs_buf.c. Return address = 0xffffffff8127c13a
[ 2487.812981] XFS (sdc2): xfs_log_force: error 5 returned.
[ 2487.812991] XFS (sdc2): xfs_do_force_shutdown(0x1) called from line 1031 of file fs/xfs/xfs_buf.c. Return address = 0xffffffff8127c13a
[ 2489.420042] XFS (sdc3): Filesystem not writable / already shutdown.
[ 2490.955438] XFS (sdc2): Filesystem not writable / already shutdown.
Signed-off-by: Raghavendra D Prabhu <rprabhu@xxxxxxxxxxx>
Tested-by: Raghavendra D Prabhu <rprabhu@xxxxxxxxxxx>
---
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;
+ }
+
if (!(mp->m_flags & XFS_MOUNT_RDONLY)) {
/* 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);
}
--
1.7.10.1
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