diff options
| author | Andi Kleen | 2009-01-06 03:05:09 +0000 |
|---|---|---|
| committer | Alasdair G Kergon | 2009-01-06 03:05:09 +0000 |
| commit | ab4c1424882be9cd70b89abf2b484add355712fa (patch) | |
| tree | 8baed3606be67900df9f02e42fcdb091b78c5def /include | |
| parent | 7d76345da6ed3927c9cbf5d3f7a7021e8bba7374 (diff) | |
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 'include')
| -rw-r--r-- | include/linux/device-mapper.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index c1ba76c7c0e5..8209e08969f9 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -112,7 +112,14 @@ void dm_put_device(struct dm_target *ti, struct dm_dev *d); /* * Information about a target type */ + +/* + * Target features + */ +#define DM_TARGET_SUPPORTS_BARRIERS 0x00000001 + struct target_type { + uint64_t features; const char *name; struct module *module; unsigned version[3]; |