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authorMike Snitzer <snitzer@redhat.com>2013-03-20 17:21:27 +0000
committerAlasdair G Kergon <agk@redhat.com>2013-03-20 17:21:27 +0000
commit4e7f506f6429636115e2f58f9f97089acc62524a (patch)
tree8758ebd6ee210ec303b661df775f31b3e9f45dd9 /drivers/md/dm-cache-policy-mq.c
parente2e74d617eadc15f601983270c4f4a6935c5a943 (diff)
dm cache: policy change version from string to integer set
Separate dm cache policy version string into 3 unsigned numbers corresponding to major, minor and patchlevel and store them at the end of the on-disk metadata so we know which version of the policy generated the hints in case a future version wants to use them differently. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm-cache-policy-mq.c')
-rw-r--r--drivers/md/dm-cache-policy-mq.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/md/dm-cache-policy-mq.c b/drivers/md/dm-cache-policy-mq.c
index 964153255076..dc112a7137fe 100644
--- a/drivers/md/dm-cache-policy-mq.c
+++ b/drivers/md/dm-cache-policy-mq.c
@@ -14,7 +14,6 @@
#include <linux/vmalloc.h>
#define DM_MSG_PREFIX "cache-policy-mq"
-#define MQ_VERSION "1.0.0"
static struct kmem_cache *mq_entry_cache;
@@ -1133,6 +1132,7 @@ bad_cache_alloc:
static struct dm_cache_policy_type mq_policy_type = {
.name = "mq",
+ .version = {1, 0, 0},
.hint_size = 4,
.owner = THIS_MODULE,
.create = mq_create
@@ -1140,6 +1140,7 @@ static struct dm_cache_policy_type mq_policy_type = {
static struct dm_cache_policy_type default_policy_type = {
.name = "default",
+ .version = {1, 0, 0},
.hint_size = 4,
.owner = THIS_MODULE,
.create = mq_create
@@ -1164,7 +1165,10 @@ static int __init mq_init(void)
r = dm_cache_policy_register(&default_policy_type);
if (!r) {
- DMINFO("version " MQ_VERSION " loaded");
+ DMINFO("version %u.%u.%u loaded",
+ mq_policy_type.version[0],
+ mq_policy_type.version[1],
+ mq_policy_type.version[2]);
return 0;
}