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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 /include/linux/device-mapper.h
parentda5dadb4f11660ca67580cd4a7420161266d6254 (diff)
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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 'include/linux/device-mapper.h')
-rw-r--r--include/linux/device-mapper.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index da83f64952e7..1e2426c18eb4 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -87,7 +87,8 @@ typedef void (*dm_resume_fn) (struct dm_target *ti);
typedef void (*dm_status_fn) (struct dm_target *ti, status_type_t status_type,
unsigned status_flags, char *result, unsigned maxlen);
-typedef int (*dm_message_fn) (struct dm_target *ti, unsigned argc, char **argv);
+typedef int (*dm_message_fn) (struct dm_target *ti, unsigned argc, char **argv,
+ char *result, unsigned maxlen);
typedef int (*dm_prepare_ioctl_fn) (struct dm_target *ti,
struct block_device **bdev, fmode_t *mode);