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dm: allow targets to return output from messages they are sent

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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>
This commit is contained in:
Mike Snitzer
2018-02-28 15:59:59 -05:00
parent da5dadb4f1
commit 1eb5fa849f
11 changed files with 21 additions and 12 deletions
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3
drivers/md/dm-log-writes.c
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@@ -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;