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| author | Mike Snitzer <snitzer@redhat.com> | 2018-02-28 15:59:59 -0500 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2018-04-03 15:04:10 -0400 |
| commit | 1eb5fa849f2bf9186a618e85bea23f02e527540a (patch) | |
| tree | b0f5e85395f06f86e7db283155c5f73a5b942c8b /drivers/md/dm-switch.c | |
| parent | da5dadb4f11660ca67580cd4a7420161266d6254 (diff) | |
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-switch.c')
| -rw-r--r-- | drivers/md/dm-switch.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/md/dm-switch.c b/drivers/md/dm-switch.c index 8d0ba879777e..8f9208c2d2e3 100644 --- a/drivers/md/dm-switch.c +++ b/drivers/md/dm-switch.c @@ -466,7 +466,8 @@ static int process_set_region_mappings(struct switch_ctx *sctx, * * Only set_region_mappings is supported. */ -static int switch_message(struct dm_target *ti, unsigned argc, char **argv) +static int switch_message(struct dm_target *ti, unsigned argc, char **argv, + char *result, unsigned maxlen) { static DEFINE_MUTEX(message_mutex); |