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authorAndi Kleen <ak@suse.de>2009-01-06 03:05:09 +0000
committerAlasdair G Kergon <agk@redhat.com>2009-01-06 03:05:09 +0000
commitab4c1424882be9cd70b89abf2b484add355712fa (patch)
tree8baed3606be67900df9f02e42fcdb091b78c5def /include
parent7d76345da6ed3927c9cbf5d3f7a7021e8bba7374 (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.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index c1ba76c7c0e..8209e08969f 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];