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authorMike Snitzer <snitzer@redhat.com>2018-02-28 15:59:59 -0500
committerMike Snitzer <snitzer@redhat.com>2018-04-03 15:04:10 -0400
commit1eb5fa849f2bf9186a618e85bea23f02e527540a (patch)
treeb0f5e85395f06f86e7db283155c5f73a5b942c8b /drivers/md/dm-cache-target.c
parentda5dadb4f11660ca67580cd4a7420161266d6254 (diff)
downloadlinux-1eb5fa849f2bf9186a618e85bea23f02e527540a.tar.bz2
dm: allow targets to return output from messages they are sent
Could be useful for a target to return stats or other information. If a target does DMEMIT() anything to @result from its .message method then it must return 1 to the caller. Signed-off-By: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/dm-cache-target.c')
-rw-r--r--drivers/md/dm-cache-target.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 47407e43b96a..da208638fba4 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -3387,7 +3387,8 @@ static int process_invalidate_cblocks_message(struct cache *cache, unsigned coun
*
* The key migration_threshold is supported by the cache target core.
*/
-static int cache_message(struct dm_target *ti, unsigned argc, char **argv)
+static int cache_message(struct dm_target *ti, unsigned argc, char **argv,
+ char *result, unsigned maxlen)
{
struct cache *cache = ti->private;