Add raid1->raid0 takeover support
This patch introduces raid 1 to raid0 takeover operation in kernel space. Signed-off-by: Krzysztof Wojcik <krzysztof.wojcik@intel.com> Signed-off-by: Neil Brown <neilb@nbeee.brown>
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@ -179,6 +179,14 @@ static int create_strip_zones(mddev_t *mddev, raid0_conf_t **private_conf)
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rdev1->new_raid_disk = j;
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}
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if (mddev->level == 1) {
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/* taiking over a raid1 array-
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* we have only one active disk
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*/
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j = 0;
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rdev1->new_raid_disk = j;
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}
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if (j < 0 || j >= mddev->raid_disks) {
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printk(KERN_ERR "md/raid0:%s: bad disk number %d - "
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"aborting!\n", mdname(mddev), j);
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@ -644,12 +652,38 @@ static void *raid0_takeover_raid10(mddev_t *mddev)
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return priv_conf;
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}
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static void *raid0_takeover_raid1(mddev_t *mddev)
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{
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raid0_conf_t *priv_conf;
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/* Check layout:
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* - (N - 1) mirror drives must be already faulty
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*/
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if ((mddev->raid_disks - 1) != mddev->degraded) {
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printk(KERN_ERR "md/raid0:%s: (N - 1) mirrors drives must be already faulty!\n",
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mdname(mddev));
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return ERR_PTR(-EINVAL);
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}
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/* Set new parameters */
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mddev->new_level = 0;
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mddev->new_layout = 0;
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mddev->new_chunk_sectors = 128; /* by default set chunk size to 64k */
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mddev->delta_disks = 1 - mddev->raid_disks;
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/* make sure it will be not marked as dirty */
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mddev->recovery_cp = MaxSector;
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create_strip_zones(mddev, &priv_conf);
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return priv_conf;
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}
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static void *raid0_takeover(mddev_t *mddev)
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{
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/* raid0 can take over:
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* raid4 - if all data disks are active.
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* raid5 - providing it is Raid4 layout and one disk is faulty
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* raid10 - assuming we have all necessary active disks
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* raid1 - with (N -1) mirror drives faulty
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*/
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if (mddev->level == 4)
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return raid0_takeover_raid45(mddev);
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@ -665,6 +699,12 @@ static void *raid0_takeover(mddev_t *mddev)
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if (mddev->level == 10)
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return raid0_takeover_raid10(mddev);
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if (mddev->level == 1)
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return raid0_takeover_raid1(mddev);
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printk(KERN_ERR "Takeover from raid%i to raid0 not supported\n",
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mddev->level);
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return ERR_PTR(-EINVAL);
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}
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