[XFS] write barrier support Issue all log sync operations as ordered

writes.  In addition flush the disk cache on fsync if the sync cached
operation didn't sync the log to disk (this requires some additional
bookeping in the transaction and log code). If the device doesn't claim to
support barriers, the filesystem has an extern log volume or the trial
superblock write with barriers enabled failed we disable barriers and
print a warning.  We should probably fail the mount completely, but that
could lead to nasty boot failures for the root filesystem.  Not enabled by
default yet, needs more destructive testing first.

SGI-PV: 912426
SGI-Modid: xfs-linux:xfs-kern:198723a

Signed-off-by: Christoph Hellwig <hch@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/xfs/xfs_clnt.h b/fs/xfs/xfs_clnt.h
index b3215ffe0be8..c93cb282f3d8 100644
--- a/fs/xfs/xfs_clnt.h
+++ b/fs/xfs/xfs_clnt.h
@@ -99,7 +99,7 @@ struct xfs_mount_args {
                                                  * enforcement */
 #define XFSMNT_NOUUID           0x01000000      /* Ignore fs uuid */
 #define XFSMNT_DMAPI            0x02000000      /* enable dmapi/xdsm */
-#define XFSMNT_NOLOGFLUSH       0x04000000      /* Don't flush for log blocks */
+#define XFSMNT_BARRIER          0x04000000      /* use write barriers */
 #define XFSMNT_IDELETE          0x08000000      /* inode cluster delete */
 #define XFSMNT_SWALLOC          0x10000000      /* turn on stripe width
                                                  * allocation */