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authorMikulas Patocka <mpatocka@redhat.com>2009-12-11 02:52:32 +0300
committerAlasdair G Kergon <agk@redhat.com>2009-12-11 02:52:32 +0300
commit1e03f97e4301f75a2f3b649787f7876516764929 (patch)
tree37f4baa83145c011245a83f1e18acf9348aac3c3 /drivers/md/dm-exception-store.h
parent9d3b15c4c776b041f9ee81810cbd375275411829 (diff)
downloadlinux-1e03f97e4301f75a2f3b649787f7876516764929.tar.xz
dm snapshot: add merging
Merging is started when origin is resumed and it is stopped when origin is suspended or when the merging snapshot is destroyed or errors are detected. Merging is not yet interlocked with writes: this will be handled in subsequent patches. The code relies on callbacks from a private kcopyd thread. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm-exception-store.h')
-rw-r--r--drivers/md/dm-exception-store.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/md/dm-exception-store.h b/drivers/md/dm-exception-store.h
index c53e08935b42..e8dfa06af3ba 100644
--- a/drivers/md/dm-exception-store.h
+++ b/drivers/md/dm-exception-store.h
@@ -154,6 +154,13 @@ static inline void dm_consecutive_chunk_count_inc(struct dm_exception *e)
BUG_ON(!dm_consecutive_chunk_count(e));
}
+static inline void dm_consecutive_chunk_count_dec(struct dm_exception *e)
+{
+ BUG_ON(!dm_consecutive_chunk_count(e));
+
+ e->new_chunk -= (1ULL << DM_CHUNK_NUMBER_BITS);
+}
+
# else
# define DM_CHUNK_CONSECUTIVE_BITS 0
@@ -171,6 +178,10 @@ static inline void dm_consecutive_chunk_count_inc(struct dm_exception *e)
{
}
+static inline void dm_consecutive_chunk_count_dec(struct dm_exception *e)
+{
+}
+
# endif
/*