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| author | Mike Snitzer <snitzer@redhat.com> | 2013-03-20 18:21:27 +0100 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2013-03-20 18:21:27 +0100 |
| commit | 4e7f506f6429636115e2f58f9f97089acc62524a (patch) | |
| tree | 8758ebd6ee210ec303b661df775f31b3e9f45dd9 /drivers/md/dm-cache-policy.h | |
| parent | dm cache: fix race in writethrough implementation (diff) | |
| download | linux-4e7f506f6429636115e2f58f9f97089acc62524a.tar.xz linux-4e7f506f6429636115e2f58f9f97089acc62524a.zip | |
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.h')
| -rw-r--r-- | drivers/md/dm-cache-policy.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/md/dm-cache-policy.h b/drivers/md/dm-cache-policy.h index f0f51b260544..558bdfdabf5f 100644 --- a/drivers/md/dm-cache-policy.h +++ b/drivers/md/dm-cache-policy.h @@ -196,6 +196,7 @@ struct dm_cache_policy { * We maintain a little register of the different policy types. */ #define CACHE_POLICY_NAME_SIZE 16 +#define CACHE_POLICY_VERSION_SIZE 3 struct dm_cache_policy_type { /* For use by the register code only. */ @@ -206,6 +207,7 @@ struct dm_cache_policy_type { * what gets passed on the target line to select your policy. */ char name[CACHE_POLICY_NAME_SIZE]; + unsigned version[CACHE_POLICY_VERSION_SIZE]; /* * Policies may store a hint for each each cache block. |