Merge branch 'for-linus' of git://neil.brown.name/md

* 'for-linus' of git://neil.brown.name/md: (52 commits)
  md: Protect access to mddev->disks list using RCU
  md: only count actual openers as access which prevent a 'stop'
  md: linear: Make array_size sector-based and rename it to array_sectors.
  md: Make mddev->array_size sector-based.
  md: Make super_type->rdev_size_change() take sector-based sizes.
  md: Fix check for overlapping devices.
  md: Tidy up rdev_size_store a bit:
  md: Remove some unused macros.
  md: Turn rdev->sb_offset into a sector-based quantity.
  md: Make calc_dev_sboffset() return a sector count.
  md: Replace calc_dev_size() by calc_num_sectors().
  md: Make update_size() take the number of sectors.
  md: Better control of when do_md_stop is allowed to stop the array.
  md: get_disk_info(): Don't convert between signed and unsigned and back.
  md: Simplify restart_array().
  md: alloc_disk_sb(): Return proper error value.
  md: Simplify sb_equal().
  md: Simplify uuid_equal().
  md: sb_equal(): Fix misleading printk.
  md: Fix a typo in the comment to cmd_match().
  ...

1 files changed, 12 insertions, 5 deletions

diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c
index e968116e0de9..c4779ccba1c3 100644
--- a/drivers/md/multipath.c
+++ b/drivers/md/multipath.c
@@ -281,13 +281,18 @@ static int multipath_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
 {
         multipath_conf_t *conf = mddev->private;
         struct request_queue *q;
-        int found = 0;
+        int err = -EEXIST;
         int path;
         struct multipath_info *p;
+        int first = 0;
+        int last = mddev->raid_disks - 1;
+
+        if (rdev->raid_disk >= 0)
+                first = last = rdev->raid_disk;
 
         print_multipath_conf(conf);
 
-        for (path=0; path<mddev->raid_disks; path++) 
+        for (path = first; path <= last; path++)
                 if ((p=conf->multipaths+path)->rdev == NULL) {
                         q = rdev->bdev->bd_disk->queue;
                         blk_queue_stack_limits(mddev->queue, q);
@@ -307,11 +312,13 @@ static int multipath_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
                         rdev->raid_disk = path;
                         set_bit(In_sync, &rdev->flags);
                         rcu_assign_pointer(p->rdev, rdev);
-                        found = 1;
+                        err = 0;
+                        break;
                 }
 
         print_multipath_conf(conf);
-        return found;
+
+        return err;
 }
 
 static int multipath_remove_disk(mddev_t *mddev, int number)
@@ -497,7 +504,7 @@ static int multipath_run (mddev_t *mddev)
         /*
          * Ok, everything is just fine now
          */
-        mddev->array_size = mddev->size;
+        mddev->array_sectors = mddev->size * 2;
 
         mddev->queue->unplug_fn = multipath_unplug;
         mddev->queue->backing_dev_info.congested_fn = multipath_congested;