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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-log-writes.c | |
| parent | dm: fix dropped return code from dm_get_bdev_for_ioctl (diff) | |
| download | linux-dev-1eb5fa849f2bf9186a618e85bea23f02e527540a.tar.xz linux-dev-1eb5fa849f2bf9186a618e85bea23f02e527540a.zip | |
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-log-writes.c')
| -rw-r--r-- | drivers/md/dm-log-writes.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/md/dm-log-writes.c b/drivers/md/dm-log-writes.c index 3362d866793b..e4c015dfef43 100644 --- a/drivers/md/dm-log-writes.c +++ b/drivers/md/dm-log-writes.c @@ -887,7 +887,8 @@ static int log_writes_iterate_devices(struct dm_target *ti, * Messages supported: * mark <mark data> - specify the marked data. */ -static int log_writes_message(struct dm_target *ti, unsigned argc, char **argv) +static int log_writes_message(struct dm_target *ti, unsigned argc, char **argv, + char *result, unsigned maxlen) { int r = -EINVAL; struct log_writes_c *lc = ti->private; |