From 1eb5fa849f2bf9186a618e85bea23f02e527540a Mon Sep 17 00:00:00 2001 From: Mike Snitzer Date: Wed, 28 Feb 2018 15:59:59 -0500 Subject: 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 --- include/linux/device-mapper.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'include/linux/device-mapper.h') 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); -- cgit v1.2.3