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Commit 1eb5fa84 authored by Mike Snitzer's avatar Mike Snitzer
Browse files

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: default avatarMike Snitzer <snitzer@redhat.com>
parent da5dadb4

drivers/md/dm-cache-target.c

+2 −1
Original line number Diff line number Diff line
@@ -3387,7 +3387,8 @@ static int process_invalidate_cblocks_message(struct cache *cache, unsigned coun 
 *

 * The key migration_threshold is supported by the cache target core.

 */

static int cache_message(struct dm_target *ti, unsigned argc, char **argv)

static int cache_message(struct dm_target *ti, unsigned argc, char **argv,

			 char *result, unsigned maxlen)

{

	struct cache *cache = ti->private;

drivers/md/dm-crypt.c

+2 −1
Original line number Diff line number Diff line
@@ -2942,7 +2942,8 @@ static void crypt_resume(struct dm_target *ti) 
 *	key set <key>

 *	key wipe

 */

static int crypt_message(struct dm_target *ti, unsigned argc, char **argv)

static int crypt_message(struct dm_target *ti, unsigned argc, char **argv,

			 char *result, unsigned maxlen)

{

	struct crypt_config *cc = ti->private;

	int key_size, ret = -EINVAL;

drivers/md/dm-era-target.c

+2 −1
Original line number Diff line number Diff line
@@ -1635,7 +1635,8 @@ static void era_status(struct dm_target *ti, status_type_t type, 
	DMEMIT("Error");

}



static int era_message(struct dm_target *ti, unsigned argc, char **argv)

static int era_message(struct dm_target *ti, unsigned argc, char **argv,

		       char *result, unsigned maxlen)

{

	struct era *era = ti->private;

drivers/md/dm-ioctl.c

+1 −1
Original line number Diff line number Diff line
@@ -1595,7 +1595,7 @@ static int target_message(struct file *filp, struct dm_ioctl *param, size_t para 
		DMWARN("Target message sector outside device.");

		r = -EINVAL;

	} else if (ti->type->message)

		r = ti->type->message(ti, argc, argv);

		r = ti->type->message(ti, argc, argv, result, maxlen);

	else {

		DMWARN("Target type does not support messages");

		r = -EINVAL;

drivers/md/dm-log-writes.c

+2 −1
Original line number Diff line number Diff line
@@ -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;