[XFS] Fix a possible forced shutdown due to mishandling write barriers
with remount,ro.
SGI-PV: 951944
SGI-Modid: xfs-linux-melb:xfs-kern:25742a
Signed-off-by: Nathan Scott <nathans@sgi.com>
diff --git a/fs/xfs/xfs_vfsops.c b/fs/xfs/xfs_vfsops.c
index f0e09ca..36ea1b2 100644
--- a/fs/xfs/xfs_vfsops.c
+++ b/fs/xfs/xfs_vfsops.c
@@ -669,31 +669,22 @@
xfs_mount_t *mp = XFS_BHVTOM(bdp);
int error;
- if (args->flags & XFSMNT_BARRIER)
- mp->m_flags |= XFS_MOUNT_BARRIER;
- else
- mp->m_flags &= ~XFS_MOUNT_BARRIER;
-
- if ((vfsp->vfs_flag & VFS_RDONLY) &&
- !(*flags & MS_RDONLY)) {
- vfsp->vfs_flag &= ~VFS_RDONLY;
-
- if (args->flags & XFSMNT_BARRIER)
+ if (!(*flags & MS_RDONLY)) { /* rw/ro -> rw */
+ if (vfsp->vfs_flag & VFS_RDONLY)
+ vfsp->vfs_flag &= ~VFS_RDONLY;
+ if (args->flags & XFSMNT_BARRIER) {
+ mp->m_flags |= XFS_MOUNT_BARRIER;
xfs_mountfs_check_barriers(mp);
- }
-
- if (!(vfsp->vfs_flag & VFS_RDONLY) &&
- (*flags & MS_RDONLY)) {
+ } else {
+ mp->m_flags &= ~XFS_MOUNT_BARRIER;
+ }
+ } else if (!(vfsp->vfs_flag & VFS_RDONLY)) { /* rw -> ro */
VFS_SYNC(vfsp, SYNC_FSDATA|SYNC_BDFLUSH|SYNC_ATTR, NULL, error);
-
xfs_quiesce_fs(mp);
-
- /* Ok now write out an unmount record */
xfs_log_unmount_write(mp);
xfs_unmountfs_writesb(mp);
vfsp->vfs_flag |= VFS_RDONLY;
}
-
return 0;
}