md raid1 can pass down barriers, but does not set an ordered flag
on the queue, so xfs does not even attempt a barrier write, and
will never use barriers on these block devices.
I propose removing the flag check and just let the barrier write
test determine barrier support.
The risk here, I suppose, is that if something does not set an ordered
flag and also does not properly return an error on a barrier write...
but if it's any consolation jbd/ext3/reiserfs never test the flag,
and don't even do a test write, they just disable barriers the first
time an actual journal barrier write fails.
Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxxx>
---
Index: linux-2.6.25.1/fs/xfs/linux-2.6/xfs_super.c
===================================================================
--- linux-2.6.25.1.orig/fs/xfs/linux-2.6/xfs_super.c
+++ linux-2.6.25.1/fs/xfs/linux-2.6/xfs_super.c
@@ -733,14 +733,6 @@ xfs_mountfs_check_barriers(xfs_mount_t *
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");
--
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