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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.c
parente2e74d617eadc15f601983270c4f4a6935c5a943 (diff)
downloadlinux-4e7f506f6429636115e2f58f9f97089acc62524a.tar.bz2
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.c')
-rw-r--r--drivers/md/dm-cache-policy.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/md/dm-cache-policy.c b/drivers/md/dm-cache-policy.c
index 2cbf5fdaac52..21c03c570c06 100644
--- a/drivers/md/dm-cache-policy.c
+++ b/drivers/md/dm-cache-policy.c
@@ -150,6 +150,14 @@ const char *dm_cache_policy_get_name(struct dm_cache_policy *p)
}
EXPORT_SYMBOL_GPL(dm_cache_policy_get_name);
+const unsigned *dm_cache_policy_get_version(struct dm_cache_policy *p)
+{
+ struct dm_cache_policy_type *t = p->private;
+
+ return t->version;
+}
+EXPORT_SYMBOL_GPL(dm_cache_policy_get_version);
+
size_t dm_cache_policy_get_hint_size(struct dm_cache_policy *p)
{
struct dm_cache_policy_type *t = p->private;