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md/raid4: permit raid0 takeover 

For consistency allow raid4 to takeover raid0 in addition to raid5 (with a
raid4 layout).

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2010-05-01 18:09:05 -07:00 committed by NeilBrown
parent e555190d82
commit f1b29bcae1
1 changed files with 17 additions and 15 deletions
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32
drivers/md/raid5.c
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@ -5610,10 +5610,17 @@ static void raid5_quiesce(mddev_t *mddev, int state)
}
static void *raid5_takeover_raid0(mddev_t *mddev)
static void *raid45_takeover_raid0(mddev_t *mddev, int level)
{
struct raid0_private_data *raid0_priv = mddev->private;
mddev->new_level = 5;
/* for raid0 takeover only one zone is supported */
if (raid0_priv->nr_strip_zones > 1) {
printk(KERN_ERR "md: cannot takeover raid0 with more than one zone.\n");
return ERR_PTR(-EINVAL);
}
mddev->new_level = level;
mddev->new_layout = ALGORITHM_PARITY_N;
mddev->new_chunk_sectors = mddev->chunk_sectors;
mddev->raid_disks += 1;
@ -5749,22 +5756,13 @@ static int raid6_check_reshape(mddev_t *mddev)
static void *raid5_takeover(mddev_t *mddev)
{
/* raid5 can take over:
* raid0 - if all devices are the same - make it a raid4 layout
* raid0 - if there is only one strip zone - make it a raid4 layout
* raid1 - if there are two drives. We need to know the chunk size
* raid4 - trivial - just use a raid4 layout.
* raid6 - Providing it is a *_6 layout
*/
if (mddev->level == 0) {
/* for raid0 takeover only one zone is supported */
struct raid0_private_data *raid0_priv
= mddev->private;
if (raid0_priv->nr_strip_zones > 1) {
printk(KERN_ERR "md: cannot takeover raid 0 with more than one zone.\n");
return ERR_PTR(-EINVAL);
}
return raid5_takeover_raid0(mddev);
}
if (mddev->level == 0)
return raid45_takeover_raid0(mddev, 5);
if (mddev->level == 1)
return raid5_takeover_raid1(mddev);
if (mddev->level == 4) {
@ -5780,8 +5778,12 @@ static void *raid5_takeover(mddev_t *mddev)
static void *raid4_takeover(mddev_t *mddev)
{
/* raid4 can take over raid5 if layout is right.
/* raid4 can take over:
* raid0 - if there is only one strip zone
* raid5 - if layout is right
*/
if (mddev->level == 0)
return raid45_takeover_raid0(mddev, 4);
if (mddev->level == 5 &&
mddev->layout == ALGORITHM_PARITY_N) {
mddev->new_layout = 0;