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

* 'for-linus' of git://neil.brown.name/md:
  md: don't retry recovery of raid1 that fails due to error on source drive.
  md: Allow md devices to be created by name.
  md: make devices disappear when they are no longer needed.
  md: centralise all freeing of an 'mddev' in 'md_free'
  md: move allocation of ->queue from mddev_find to md_probe
  md: need another print_sb for mdp_superblock_1
  md: use list_for_each_entry macro directly
  md: raid0: make hash_spacing and preshift sector-based.
  md: raid0: Represent the size of strip zones in sectors.
  md: raid0 create_strip_zones(): Add KERN_INFO/KERN_ERR to printk's.
  md: raid0 create_strip_zones(): Make two local variables sector-based.
  md: raid0: Represent zone->zone_offset in sectors.
  md: raid0: Represent device offset in sectors.
  md: raid0_make_request(): Replace local variable block by sector.
  md: raid0_make_request(): Remove local variable chunk_size.
  md: raid0_make_request(): Replace chunksize_bits by chunksect_bits.
  md: use sysfs_notify_dirent to notify changes to md/sync_action.
  md: fix bitmap-on-external-file bug.

1 files changed, 14 insertions, 0 deletions

diff --git a/fs/block_dev.c b/fs/block_dev.c
index b957717e25ab..8ebbfdf708c2 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1005,6 +1005,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
         }
 
         lock_kernel();
+ restart:
 
         ret = -ENXIO;
         disk = get_gendisk(bdev->bd_dev, &partno);
@@ -1025,6 +1026,19 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
 
                         if (disk->fops->open) {
                                 ret = disk->fops->open(bdev, mode);
+                                if (ret == -ERESTARTSYS) {
+                                        /* Lost a race with 'disk' being
+                                         * deleted, try again.
+                                         * See md.c
+                                         */
+                                        disk_put_part(bdev->bd_part);
+                                        bdev->bd_part = NULL;
+                                        module_put(disk->fops->owner);
+                                        put_disk(disk);
+                                        bdev->bd_disk = NULL;
+                                        mutex_unlock(&bdev->bd_mutex);
+                                        goto restart;
+                                }
                                 if (ret)
                                         goto out_clear;
                         }