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md:Add support for Raid0->Raid5 takeover

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Signed-off-by: Maciej Trela <maciej.trela@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Trela Maciej 2010-03-08 16:02:42 +11:00 committed by NeilBrown
parent 84707f38e7
commit 54071b3808
2 changed files with 40 additions and 0 deletions
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14
drivers/md/md.c
View file

@ -3017,6 +3017,20 @@ level_store(mddev_t *mddev, const char *buf, size_t len)
mddev->to_remove = &md_redundancy_group;
}
if (mddev->pers->sync_request == NULL &&
mddev->external) {
/* We are converting from a no-redundancy array
* to a redundancy array and metadata is managed
* externally so we need to be sure that writes
* won't block due to a need to transition
* clean->dirty
* until external management is started.
*/
mddev->in_sync = 0;
mddev->safemode_delay = 0;
mddev->safemode = 0;
}
module_put(mddev->pers->owner);
/* Invalidate devices that are now superfluous */
list_for_each_entry(rdev, &mddev->disks, same_set)

26
drivers/md/raid5.c
View file

@ -52,6 +52,7 @@
#include <linux/cpu.h>
#include "md.h"
#include "raid5.h"
#include "raid0.h"
#include "bitmap.h"
/*
@ -5619,6 +5620,21 @@ static void raid5_quiesce(mddev_t *mddev, int state)
}
static void *raid5_takeover_raid0(mddev_t *mddev)
{
mddev->new_level = 5;
mddev->new_layout = ALGORITHM_PARITY_N;
mddev->new_chunk_sectors = mddev->chunk_sectors;
mddev->raid_disks += 1;
mddev->delta_disks = 1;
/* make sure it will be not marked as dirty */
mddev->recovery_cp = MaxSector;
return setup_conf(mddev);
}
static void *raid5_takeover_raid1(mddev_t *mddev)
{
int chunksect;
@ -5748,6 +5764,16 @@ static void *raid5_takeover(mddev_t *mddev)
* 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 == 1)
return raid5_takeover_raid1(mddev);