[XFS] Barriers need to be dynamically checked and switched off

If the underlying block device suddenly stops supporting barriers, we need
to handle the -EOPNOTSUPP error in a sane manner rather than shutting
down the filesystem. If we get this error, clear the barrier flag, reissue
the I/O, and tell the world bad things are occurring.

SGI-PV: 964544
SGI-Modid: xfs-linux-melb:xfs-kern:28568a

Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Tim Shimmin <tes@sgi.com>

1 files changed, 0 insertions, 8 deletions

diff --git a/fs/xfs/linux-2.6/xfs_super.c b/fs/xfs/linux-2.6/xfs_super.c
index 491d1f4f202d..17ad5e463710 100644
--- a/fs/xfs/linux-2.6/xfs_super.c
+++ b/fs/xfs/linux-2.6/xfs_super.c
@@ -304,14 +304,6 @@ xfs_mountfs_check_barriers(xfs_mount_t *mp)
                 return;
         }
 
-        if (mp->m_ddev_targp->bt_bdev->bd_disk->queue->ordered ==
-                                        QUEUE_ORDERED_NONE) {
-                xfs_fs_cmn_err(CE_NOTE, mp,
-                  "Disabling barriers, not supported by the underlying device");
-                mp->m_flags &= ~XFS_MOUNT_BARRIER;
-                return;
-        }
-
         if (xfs_readonly_buftarg(mp->m_ddev_targp)) {
                 xfs_fs_cmn_err(CE_NOTE, mp,
                   "Disabling barriers, underlying device is readonly");