Commit 90b39d58 authored by Hannes Reinecke's avatar Hannes Reinecke Committed by Mike Snitzer
Browse files

dm zoned: add 'message' callback 



Add callback for 'dmsetup message' to allow the reclaim process
to be triggered manually.
Eg.

	dmsetup message /dev/dm-X 0 message

will start the reclaim process even if the default threshold
of 50 percent of free random zones is not reached.

Signed-off-by: default avatarHannes Reinecke <hare@suse.de>
Reviewed-by: default avatarBob Liu <bob.liu@oracle.com>
Reviewed-by: default avatarDamien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent bc3d5717

Documentation/admin-guide/device-mapper/dm-zoned.rst

+12 −0
Original line number Diff line number Diff line
@@ -160,3 +160,15 @@ where <nr_zones> is the total number of zones, <nr_unmap_rnd> is the number 
of unmapped (ie free) random zones, <nr_rnd> the total number of zones,

<nr_unmap_seq> the number of unmapped sequential zones, and <nr_seq> the

total number of sequential zones.



Normally the reclaim process will be started once there are less than 50

percent free random zones. In order to start the reclaim process manually

even before reaching this threshold the 'dmsetup message' function can be

used:



Ex::



	dmsetup message /dev/dm-X 0 reclaim



will start the reclaim process and random zones will be moved to sequential

zones.

drivers/md/dm-zoned-target.c

+15 −0
Original line number Diff line number Diff line
@@ -990,6 +990,20 @@ static void dmz_status(struct dm_target *ti, status_type_t type, 
	return;

}



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

		       char *result, unsigned int maxlen)

{

	struct dmz_target *dmz = ti->private;

	int r = -EINVAL;



	if (!strcasecmp(argv[0], "reclaim")) {

		dmz_schedule_reclaim(dmz->reclaim);

		r = 0;

	} else

		DMERR("unrecognized message %s", argv[0]);

	return r;

}



static struct target_type dmz_type = {

	.name		 = "zoned",

	.version	 = {1, 1, 0},
@@ -1004,6 +1018,7 @@ static struct target_type dmz_type = { 
	.resume		 = dmz_resume,

	.iterate_devices = dmz_iterate_devices,

	.status		 = dmz_status,

	.message	 = dmz_message,

};



static int __init dmz_init(void)

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