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authorJoe Thornber <ejt@redhat.com>2013-05-10 17:37:21 +0400
committerAlasdair G Kergon <agk@redhat.com>2013-05-10 17:37:21 +0400
commitac8c3f3df65e487bbcabf274eeeb9cd222f5da1e (patch)
treee1ab6d4662834bbbf248b1ad6224c9b7c3faa15e /drivers/md/dm-thin-metadata.h
parent2fc48021f4afdd109b9e52b6eef5db89ca80bac7 (diff)
downloadlinux-ac8c3f3df65e487bbcabf274eeeb9cd222f5da1e.tar.xz
dm thin: generate event when metadata threshold passed
Generate a dm event when the amount of remaining thin pool metadata space falls below a certain level. The threshold is taken to be a quarter of the size of the metadata device with a minimum threshold of 4MB. Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm-thin-metadata.h')
-rw-r--r--drivers/md/dm-thin-metadata.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/md/dm-thin-metadata.h b/drivers/md/dm-thin-metadata.h
index ef8dd709e34e..845ebbe589a9 100644
--- a/drivers/md/dm-thin-metadata.h
+++ b/drivers/md/dm-thin-metadata.h
@@ -8,6 +8,7 @@
#define DM_THIN_METADATA_H
#include "persistent-data/dm-block-manager.h"
+#include "persistent-data/dm-space-map.h"
#define THIN_METADATA_BLOCK_SIZE 4096
@@ -193,6 +194,11 @@ int dm_pool_resize_metadata_dev(struct dm_pool_metadata *pmd, dm_block_t new_siz
*/
void dm_pool_metadata_read_only(struct dm_pool_metadata *pmd);
+int dm_pool_register_metadata_threshold(struct dm_pool_metadata *pmd,
+ dm_block_t threshold,
+ dm_sm_threshold_fn fn,
+ void *context);
+
/*----------------------------------------------------------------*/
#endif