Signed-off-by: Maciej Trela <maciej.trela@xxxxxxxxx>
---
drivers/md/raid10.c | 96 +++++++++++++++++++++++++++++++++++++++++++++++----
1 files changed, 89 insertions(+), 7 deletions(-)
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index d119b7b..5b7cda6 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -2177,13 +2177,20 @@ static int run(mddev_t *mddev)
* bookkeeping area. [whatever we allocate in run(),
* should be freed in stop()]
*/
- conf = kzalloc(sizeof(conf_t), GFP_KERNEL);
- mddev->private = conf;
- if (!conf) {
- printk(KERN_ERR "raid10: couldn't allocate memory for %s\n",
- mdname(mddev));
- goto out;
- }
+
+ if (mddev->private == NULL)
+ {
+ conf = kzalloc(sizeof(conf_t), GFP_KERNEL);
+ mddev->private = conf;
+ if (!conf) {
+ printk(KERN_ERR "raid10: couldn't allocate memory for %s\n",
+ mdname(mddev));
+ goto out;
+ }
+ } else
+ conf = mddev->private;
+
+
conf->mirrors = kzalloc(sizeof(struct mirror_info)*mddev->raid_disks,
GFP_KERNEL);
if (!conf->mirrors) {
@@ -2377,6 +2384,80 @@ static void raid10_quiesce(mddev_t *mddev, int state)
}
}
+static conf_t *setup_conf(mddev_t *mddev)
+{
+ conf_t *conf;
+
+ conf = kzalloc(sizeof(conf_t), GFP_KERNEL);
+ if (conf == NULL)
+ goto abort;
+
+ return conf;
+
+ abort:
+ if (conf) {
+ kfree(conf);
+ return ERR_PTR(-EIO);
+ } else
+ return ERR_PTR(-ENOMEM);
+}
+
+static void *raid10_takeover_raid0(mddev_t *mddev)
+{
+ mdk_rdev_t *rdev;
+
+ if (mddev->degraded > 0)
+ {
+ printk(KERN_ERR "error: degraded raid0!\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ /* Update slot numbers to obtain
+ * degraded raid10 with missing mirrors
+ */
+ list_for_each_entry(rdev, &mddev->disks, same_set) {
+ rdev->raid_disk *= 2;
+ }
+
+ /* Set new parameters */
+ mddev->new_level = 10;
+ /* new layout: far_copies = 1,
+ near_copies = raid0->raid_disks */
+ mddev->new_layout = (1<<8) + mddev->raid_disks;
+ mddev->delta_disks = mddev->raid_disks;
+ mddev->degraded = mddev->raid_disks;
+ mddev->raid_disks *= 2;
+ /* make sure it will be not marked as dirty */
+ mddev->recovery_cp = MaxSector;
+
+ return setup_conf(mddev);
+}
+
+static void *raid10_takeover(mddev_t *mddev)
+{
+ mdk_rdev_t *rdev;
+ sector_t sectors, dev_sectors;
+
+ /* raid10 can take over:
+ * raid0 - providing it has only two drives
+ */
+ if (mddev->level == 0) {
+ /* make sure all devices are the same (only one zone is supported) */
+ sectors = mddev->dev_sectors;
+ sector_div(sectors, mddev->chunk_sectors);
+ list_for_each_entry(rdev, &mddev->disks, same_set) {
+ dev_sectors = rdev->sectors;
+ sector_div(dev_sectors, mddev->chunk_sectors);
+ if (dev_sectors != sectors) {
+ printk("error: cannot takeover raid 0 with different dev sizes.\n");
+ return ERR_PTR(-EINVAL);
+ }
+ }
+ return raid10_takeover_raid0(mddev);
+ }
+ return ERR_PTR(-EINVAL);
+}
+
static struct mdk_personality raid10_personality =
{
.name = "raid10",
@@ -2393,6 +2474,7 @@ static struct mdk_personality raid10_personality =
.sync_request = sync_request,
.quiesce = raid10_quiesce,
.size = raid10_size,
+ .takeover = raid10_takeover,
};
static int __init raid_init(void)
--
1.6.3.3
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