md: Add support for Raid5->Raid0 and Raid10->Raid0 takeover

Signed-off-by: Maciej Trela <maciej.trela@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>

3 files changed, 129 insertions, 6 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 22c630b7ba6c..7dcc74089550 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3045,6 +3045,13 @@ level_store(mddev_t *mddev, const char *buf, size_t len)
         mddev->layout = mddev->new_layout;
         mddev->chunk_sectors = mddev->new_chunk_sectors;
         mddev->delta_disks = 0;
+        if (mddev->pers->sync_request == NULL) {
+                /* this is now an array without redundancy, so
+                 * it must always be in_sync
+                 */
+                mddev->in_sync = 1;
+                del_timer_sync(&mddev->safemode_timer);
+        }
         pers->run(mddev);
         mddev_resume(mddev);
         set_bit(MD_CHANGE_DEVS, &mddev->flags);
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index c2e0d1d28102..afddf624bad3 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -22,6 +22,7 @@
 #include <linux/seq_file.h>
 #include "md.h"
 #include "raid0.h"
+#include "raid5.h"
 
 static void raid0_unplug(struct request_queue *q)
 {
@@ -90,7 +91,7 @@ static void dump_zones(mddev_t *mddev)
         printk(KERN_INFO "**********************************\n\n");
 }
 
-static int create_strip_zones(mddev_t *mddev)
+static int create_strip_zones(mddev_t *mddev, raid0_conf_t **private_conf)
 {
         int i, c, err;
         sector_t curr_zone_end, sectors;
@@ -164,6 +165,10 @@ static int create_strip_zones(mddev_t *mddev)
         list_for_each_entry(rdev1, &mddev->disks, same_set) {
                 int j = rdev1->raid_disk;
 
+                if (mddev->level == 10)
+                        /* taking over a raid10-n2 array */
+                        j /= 2;
+
                 if (j < 0 || j >= mddev->raid_disks) {
                         printk(KERN_ERR "raid0: bad disk number %d - "
                                 "aborting!\n", j);
@@ -264,13 +269,14 @@ static int create_strip_zones(mddev_t *mddev)
                          (mddev->chunk_sectors << 9) * mddev->raid_disks);
 
         printk(KERN_INFO "raid0: done.\n");
-        mddev->private = conf;
+        *private_conf = conf;
+
         return 0;
 abort:
         kfree(conf->strip_zone);
         kfree(conf->devlist);
         kfree(conf);
-        mddev->private = NULL;
+        *private_conf = NULL;
         return err;
 }
 
@@ -321,6 +327,7 @@ static sector_t raid0_size(mddev_t *mddev, sector_t sectors, int raid_disks)
 
 static int raid0_run(mddev_t *mddev)
 {
+        raid0_conf_t *conf;
         int ret;
 
         if (mddev->chunk_sectors == 0) {
@@ -332,9 +339,20 @@ static int raid0_run(mddev_t *mddev)
         blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors);
         mddev->queue->queue_lock = &mddev->queue->__queue_lock;
 
-        ret = create_strip_zones(mddev);
-        if (ret < 0)
-                return ret;
+        /* if private is not null, we are here after takeover */
+        if (mddev->private == NULL) {
+                ret = create_strip_zones(mddev, &conf);
+                if (ret < 0)
+                        return ret;
+                mddev->private = conf;
+        }
+        conf = mddev->private;
+        if (conf->scale_raid_disks) {
+                int i;
+                for (i=0; i < conf->strip_zone[0].nb_dev; i++)
+                        conf->devlist[i]->raid_disk /= conf->scale_raid_disks;
+                /* FIXME update sysfs rd links */
+        }
 
         /* calculate array device size */
         md_set_array_sectors(mddev, raid0_size(mddev, 0, 0));
@@ -548,6 +566,99 @@ static void raid0_status(struct seq_file *seq, mddev_t *mddev)
         return;
 }
 
+static void *raid0_takeover_raid5(mddev_t *mddev)
+{
+        mdk_rdev_t *rdev;
+        raid0_conf_t *priv_conf;
+
+        if (mddev->degraded != 1) {
+                printk(KERN_ERR "md: raid5 must be degraded! Degraded disks: %d\n",
+                       mddev->degraded);
+                return ERR_PTR(-EINVAL);
+        }
+
+        list_for_each_entry(rdev, &mddev->disks, same_set) {
+                /* check slot number for a disk */
+                if (rdev->raid_disk == mddev->raid_disks-1) {
+                        printk(KERN_ERR "md: raid5 must have missing parity disk!\n");
+                        return ERR_PTR(-EINVAL);
+                }
+        }
+
+        /* Set new parameters */
+        mddev->new_level = 0;
+        mddev->new_chunk_sectors = mddev->chunk_sectors;
+        mddev->raid_disks--;
+        mddev->delta_disks = -1;
+        /* 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_raid10(mddev_t *mddev)
+{
+        raid0_conf_t *priv_conf;
+
+        /* Check layout:
+         *  - far_copies must be 1
+         *  - near_copies must be 2
+         *  - disks number must be even
+         *  - all mirrors must be already degraded
+         */
+        if (mddev->layout != ((1 << 8) + 2)) {
+                printk(KERN_ERR "md: Raid0 cannot takover layout: %x\n",
+                       mddev->layout);
+                return ERR_PTR(-EINVAL);
+        }
+        if (mddev->raid_disks & 1) {
+                printk(KERN_ERR "md: Raid0 cannot takover Raid10 with odd disk number.\n");
+                return ERR_PTR(-EINVAL);
+        }
+        if (mddev->degraded != (mddev->raid_disks>>1)) {
+                printk(KERN_ERR "md: All mirrors must be already degraded!\n");
+                return ERR_PTR(-EINVAL);
+        }
+
+        /* Set new parameters */
+        mddev->new_level = 0;
+        mddev->new_chunk_sectors = mddev->chunk_sectors;
+        mddev->delta_disks = - mddev->raid_disks / 2;
+        mddev->raid_disks += mddev->delta_disks;
+        mddev->degraded = 0;
+        /* make sure it will be not marked as dirty */
+        mddev->recovery_cp = MaxSector;
+
+        create_strip_zones(mddev, &priv_conf);
+        priv_conf->scale_raid_disks = 2;
+        return priv_conf;
+}
+
+static void *raid0_takeover(mddev_t *mddev)
+{
+        /* raid0 can take over:
+         *  raid5 - providing it is Raid4 layout and one disk is faulty
+         *  raid10 - assuming we have all necessary active disks
+         */
+        if (mddev->level == 5) {
+                if (mddev->layout == ALGORITHM_PARITY_N)
+                        return raid0_takeover_raid5(mddev);
+
+                printk(KERN_ERR "md: Raid can only takeover Raid5 with layout: %d\n",
+                       ALGORITHM_PARITY_N);
+        }
+
+        if (mddev->level == 10)
+                return raid0_takeover_raid10(mddev);
+
+        return ERR_PTR(-EINVAL);
+}
+
+static void raid0_quiesce(mddev_t *mddev, int state)
+{
+}
+
 static struct mdk_personality raid0_personality=
 {
         .name           = "raid0",
@@ -558,6 +669,8 @@ static struct mdk_personality raid0_personality=
         .stop           = raid0_stop,
         .status         = raid0_status,
         .size           = raid0_size,
+        .takeover       = raid0_takeover,
+        .quiesce        = raid0_quiesce,
 };
 
 static int __init raid0_init (void)
diff --git a/drivers/md/raid0.h b/drivers/md/raid0.h
index 91f8e876ee64..d724e664ca4d 100644
--- a/drivers/md/raid0.h
+++ b/drivers/md/raid0.h
@@ -13,6 +13,9 @@ struct raid0_private_data
         struct strip_zone *strip_zone;
         mdk_rdev_t **devlist; /* lists of rdevs, pointed to by strip_zone->dev */
         int nr_strip_zones;
+        int scale_raid_disks; /* divide rdev->raid_disks by this in run()
+                               * to handle conversion from raid10
+                               */
 };
 
 typedef struct raid0_private_data raid0_conf_t;