1 files changed, 19 insertions, 15 deletions

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 257b00e98428..1a2421f908f0 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1120,6 +1120,15 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
                                         goto restart;
                                 }
                         }
+
+                        if (!ret && !bdev->bd_openers) {
+                                bd_set_size(bdev,(loff_t)get_capacity(disk)<<9);
+                                bdi = blk_get_backing_dev_info(bdev);
+                                if (bdi == NULL)
+                                        bdi = &default_backing_dev_info;
+                                bdev_inode_switch_bdi(bdev->bd_inode, bdi);
+                        }
+
                         /*
                          * If the device is invalidated, rescan partition
                          * if open succeeded or failed with -ENOMEDIUM.
@@ -1130,14 +1139,6 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
                                 rescan_partitions(disk, bdev);
                         if (ret)
                                 goto out_clear;
-
-                        if (!bdev->bd_openers) {
-                                bd_set_size(bdev,(loff_t)get_capacity(disk)<<9);
-                                bdi = blk_get_backing_dev_info(bdev);
-                                if (bdi == NULL)
-                                        bdi = &default_backing_dev_info;
-                                bdev_inode_switch_bdi(bdev->bd_inode, bdi);
-                        }
                 } else {
                         struct block_device *whole;
                         whole = bdget_disk(disk, 0);
@@ -1237,6 +1238,8 @@ int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder)
         res = __blkdev_get(bdev, mode, 0);
 
         if (whole) {
+                struct gendisk *disk = whole->bd_disk;
+
                 /* finish claiming */
                 mutex_lock(&bdev->bd_mutex);
                 spin_lock(&bdev_lock);
@@ -1263,15 +1266,16 @@ int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder)
                 spin_unlock(&bdev_lock);
 
                 /*
-                 * Block event polling for write claims.  Any write
-                 * holder makes the write_holder state stick until all
-                 * are released.  This is good enough and tracking
-                 * individual writeable reference is too fragile given
-                 * the way @mode is used in blkdev_get/put().
+                 * Block event polling for write claims if requested.  Any
+                 * write holder makes the write_holder state stick until
+                 * all are released.  This is good enough and tracking
+                 * individual writeable reference is too fragile given the
+                 * way @mode is used in blkdev_get/put().
                  */
-                if (!res && (mode & FMODE_WRITE) && !bdev->bd_write_holder) {
+                if (!res && (mode & FMODE_WRITE) && !bdev->bd_write_holder &&
+                    (disk->flags & GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE)) {
                         bdev->bd_write_holder = true;
-                        disk_block_events(bdev->bd_disk);
+                        disk_block_events(disk);
                 }
 
                 mutex_unlock(&bdev->bd_mutex);