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authorJoe Thornber <ejt@redhat.com>2016-09-22 13:15:21 +0300
committerMike Snitzer <snitzer@redhat.com>2017-02-16 21:12:47 +0300
commit629d0a8a1a104187db8fbf966e4cc5cfb6aa9a3c (patch)
treedf900a59355073aca34dd8de83d4ca631428cd6e /drivers/md/dm-cache-metadata.h
parentae4a46a1f60942263d6fd119fe1da49bb16d2bd5 (diff)
downloadlinux-629d0a8a1a104187db8fbf966e4cc5cfb6aa9a3c.tar.xz
dm cache metadata: add "metadata2" feature
If "metadata2" is provided as a table argument when creating/loading a cache target a more compact metadata format, with separate dirty bits, is used. "metadata2" improves speed of shutting down a cache target. Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/dm-cache-metadata.h')
-rw-r--r--drivers/md/dm-cache-metadata.h11
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/md/dm-cache-metadata.h b/drivers/md/dm-cache-metadata.h
index 8528744195e5..4f07c08cf107 100644
--- a/drivers/md/dm-cache-metadata.h
+++ b/drivers/md/dm-cache-metadata.h
@@ -45,18 +45,20 @@
* As these various flags are defined they should be added to the
* following masks.
*/
+
#define DM_CACHE_FEATURE_COMPAT_SUPP 0UL
#define DM_CACHE_FEATURE_COMPAT_RO_SUPP 0UL
#define DM_CACHE_FEATURE_INCOMPAT_SUPP 0UL
/*
- * Reopens or creates a new, empty metadata volume.
- * Returns an ERR_PTR on failure.
+ * Reopens or creates a new, empty metadata volume. Returns an ERR_PTR on
+ * failure. If reopening then features must match.
*/
struct dm_cache_metadata *dm_cache_metadata_open(struct block_device *bdev,
sector_t data_block_size,
bool may_format_device,
- size_t policy_hint_size);
+ size_t policy_hint_size,
+ unsigned metadata_version);
void dm_cache_metadata_close(struct dm_cache_metadata *cmd);
@@ -91,7 +93,8 @@ int dm_cache_load_mappings(struct dm_cache_metadata *cmd,
load_mapping_fn fn,
void *context);
-int dm_cache_set_dirty(struct dm_cache_metadata *cmd, dm_cblock_t cblock, bool dirty);
+int dm_cache_set_dirty_bits(struct dm_cache_metadata *cmd,
+ unsigned nr_bits, unsigned long *bits);
struct dm_cache_statistics {
uint32_t read_hits;