1 files changed, 19 insertions, 11 deletions

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 835de7168cd3..cacd008d6864 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -517,8 +517,8 @@ static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sect
                 int bad_sectors;
 
                 int disk = start_disk + i;
-                if (disk >= conf->raid_disks)
-                        disk -= conf->raid_disks;
+                if (disk >= conf->raid_disks * 2)
+                        disk -= conf->raid_disks * 2;
 
                 rdev = rcu_dereference(conf->mirrors[disk].rdev);
                 if (r1_bio->bios[disk] == IO_BLOCKED
@@ -883,7 +883,6 @@ static void make_request(struct mddev *mddev, struct bio * bio)
         const unsigned long do_sync = (bio->bi_rw & REQ_SYNC);
         const unsigned long do_flush_fua = (bio->bi_rw & (REQ_FLUSH | REQ_FUA));
         struct md_rdev *blocked_rdev;
-        int plugged;
         int first_clone;
         int sectors_handled;
         int max_sectors;
@@ -1034,7 +1033,6 @@ read_again:
          * the bad blocks.  Each set of writes gets it's own r1bio
          * with a set of bios attached.
          */
-        plugged = mddev_check_plugged(mddev);
 
         disks = conf->raid_disks * 2;
  retry_write:
@@ -1191,6 +1189,8 @@ read_again:
                 bio_list_add(&conf->pending_bio_list, mbio);
                 conf->pending_count++;
                 spin_unlock_irqrestore(&conf->device_lock, flags);
+                if (!mddev_check_plugged(mddev))
+                        md_wakeup_thread(mddev->thread);
         }
         /* Mustn't call r1_bio_write_done before this next test,
          * as it could result in the bio being freed.
@@ -1213,9 +1213,6 @@ read_again:
 
         /* In case raid1d snuck in to freeze_array */
         wake_up(&conf->wait_barrier);
-
-        if (do_sync || !bitmap || !plugged)
-                md_wakeup_thread(mddev->thread);
 }
 
 static void status(struct seq_file *seq, struct mddev *mddev)
@@ -1821,8 +1818,14 @@ static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio)
 
         if (atomic_dec_and_test(&r1_bio->remaining)) {
                 /* if we're here, all write(s) have completed, so clean up */
-                md_done_sync(mddev, r1_bio->sectors, 1);
-                put_buf(r1_bio);
+                int s = r1_bio->sectors;
+                if (test_bit(R1BIO_MadeGood, &r1_bio->state) ||
+                    test_bit(R1BIO_WriteError, &r1_bio->state))
+                        reschedule_retry(r1_bio);
+                else {
+                        put_buf(r1_bio);
+                        md_done_sync(mddev, s, 1);
+                }
         }
 }
 
@@ -2488,9 +2491,10 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipp
          */
         if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
                 atomic_set(&r1_bio->remaining, read_targets);
-                for (i = 0; i < conf->raid_disks * 2; i++) {
+                for (i = 0; i < conf->raid_disks * 2 && read_targets; i++) {
                         bio = r1_bio->bios[i];
                         if (bio->bi_end_io == end_sync_read) {
+                                read_targets--;
                                 md_sync_acct(bio->bi_bdev, nr_sectors);
                                 generic_make_request(bio);
                         }
@@ -2550,6 +2554,7 @@ static struct r1conf *setup_conf(struct mddev *mddev)
         err = -EINVAL;
         spin_lock_init(&conf->device_lock);
         rdev_for_each(rdev, mddev) {
+                struct request_queue *q;
                 int disk_idx = rdev->raid_disk;
                 if (disk_idx >= mddev->raid_disks
                     || disk_idx < 0)
@@ -2562,6 +2567,9 @@ static struct r1conf *setup_conf(struct mddev *mddev)
                 if (disk->rdev)
                         goto abort;
                 disk->rdev = rdev;
+                q = bdev_get_queue(rdev->bdev);
+                if (q->merge_bvec_fn)
+                        mddev->merge_check_needed = 1;
 
                 disk->head_position = 0;
         }
@@ -2617,7 +2625,7 @@ static struct r1conf *setup_conf(struct mddev *mddev)
                 goto abort;
         }
         err = -ENOMEM;
-        conf->thread = md_register_thread(raid1d, mddev, NULL);
+        conf->thread = md_register_thread(raid1d, mddev, "raid1");
         if (!conf->thread) {
                 printk(KERN_ERR
                        "md/raid1:%s: couldn't allocate thread\n",