Commit fc3a08b8 authored by Krzysztof Wojcik's avatar Krzysztof Wojcik Committed by NeilBrown
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Add raid1->raid0 takeover support 



This patch introduces raid 1 to raid0 takeover operation
in kernel space.

Signed-off-by: default avatarKrzysztof Wojcik <krzysztof.wojcik@intel.com>
Signed-off-by: default avatarNeil Brown <neilb@nbeee.brown>
parent f21e9ff7

drivers/md/raid0.c

+40 −0
Original line number Original line Diff line number Diff line
@@ -179,6 +179,14 @@ static int create_strip_zones(mddev_t *mddev, raid0_conf_t **private_conf) 
			rdev1->new_raid_disk = j;

			rdev1->new_raid_disk = j;

		}

		}





		if (mddev->level == 1) {

			/* taiking over a raid1 array-

			 * we have only one active disk

			 */

			j = 0;

			rdev1->new_raid_disk = j;

		}



		if (j < 0 || j >= mddev->raid_disks) {

		if (j < 0 || j >= mddev->raid_disks) {

			printk(KERN_ERR "md/raid0:%s: bad disk number %d - "

			printk(KERN_ERR "md/raid0:%s: bad disk number %d - "

			       "aborting!\n", mdname(mddev), j);

			       "aborting!\n", mdname(mddev), j);
@@ -644,12 +652,38 @@ static void *raid0_takeover_raid10(mddev_t *mddev) 
	return priv_conf;

	return priv_conf;

}

}





static void *raid0_takeover_raid1(mddev_t *mddev)

{

	raid0_conf_t *priv_conf;



	/* Check layout:

	 *  - (N - 1) mirror drives must be already faulty

	 */

	if ((mddev->raid_disks - 1) != mddev->degraded) {

		printk(KERN_ERR "md/raid0:%s: (N - 1) mirrors drives must be already faulty!\n",

		       mdname(mddev));

		return ERR_PTR(-EINVAL);

	}



	/* Set new parameters */

	mddev->new_level = 0;

	mddev->new_layout = 0;

	mddev->new_chunk_sectors = 128; /* by default set chunk size to 64k */

	mddev->delta_disks = 1 - mddev->raid_disks;

	/* make sure it will be not marked as dirty */

	mddev->recovery_cp = MaxSector;



	create_strip_zones(mddev, &priv_conf);

	return priv_conf;

}



static void *raid0_takeover(mddev_t *mddev)

static void *raid0_takeover(mddev_t *mddev)

{

{

	/* raid0 can take over:

	/* raid0 can take over:

	 *  raid4 - if all data disks are active.

	 *  raid4 - if all data disks are active.

	 *  raid5 - providing it is Raid4 layout and one disk is faulty

	 *  raid5 - providing it is Raid4 layout and one disk is faulty

	 *  raid10 - assuming we have all necessary active disks

	 *  raid10 - assuming we have all necessary active disks

	 *  raid1 - with (N -1) mirror drives faulty

	 */

	 */

	if (mddev->level == 4)

	if (mddev->level == 4)

		return raid0_takeover_raid45(mddev);

		return raid0_takeover_raid45(mddev);
@@ -665,6 +699,12 @@ static void *raid0_takeover(mddev_t *mddev) 
	if (mddev->level == 10)

	if (mddev->level == 10)

		return raid0_takeover_raid10(mddev);

		return raid0_takeover_raid10(mddev);





	if (mddev->level == 1)

		return raid0_takeover_raid1(mddev);



	printk(KERN_ERR "Takeover from raid%i to raid0 not supported\n",

		mddev->level);



	return ERR_PTR(-EINVAL);

	return ERR_PTR(-EINVAL);

}

}