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| author | Andi Kleen <ak@suse.de> | 2009-01-06 03:05:09 +0000 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2009-01-06 03:05:09 +0000 |
| commit | ab4c1424882be9cd70b89abf2b484add355712fa (patch) | |
| tree | 8baed3606be67900df9f02e42fcdb091b78c5def /drivers/md/dm-linear.c | |
| parent | 7d76345da6ed3927c9cbf5d3f7a7021e8bba7374 (diff) | |
| download | linux-ab4c1424882be9cd70b89abf2b484add355712fa.tar.gz linux-ab4c1424882be9cd70b89abf2b484add355712fa.tar.bz2 linux-ab4c1424882be9cd70b89abf2b484add355712fa.zip | |
dm: support barriers on simple devices
Implement barrier support for single device DM devices
This patch implements barrier support in DM for the common case of dm linear
just remapping a single underlying device. In this case we can safely
pass the barrier through because there can be no reordering between
devices.
NB. Any DM device might cease to support barriers if it gets
reconfigured so code must continue to allow for a possible
-EOPNOTSUPP on every barrier bio submitted. - agk
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm-linear.c')
| -rw-r--r-- | drivers/md/dm-linear.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c index 79fb53e51c70..bfa107f59d96 100644 --- a/drivers/md/dm-linear.c +++ b/drivers/md/dm-linear.c @@ -142,6 +142,7 @@ static struct target_type linear_target = { .status = linear_status, .ioctl = linear_ioctl, .merge = linear_merge, + .features = DM_TARGET_SUPPORTS_BARRIERS, }; int __init dm_linear_init(void) |