1 files changed, 9 insertions, 1 deletions

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 8546d123b9a7..a90e83c9be96 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -835,6 +835,8 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode,
 
         set_capacity(lo->lo_disk, size);
         bd_set_size(bdev, size << 9);
+        /* let user-space know about the new size */
+        kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE);
 
         set_blocksize(bdev, lo_blocksize);
 
@@ -858,6 +860,7 @@ out_clr:
         set_capacity(lo->lo_disk, 0);
         invalidate_bdev(bdev);
         bd_set_size(bdev, 0);
+        kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE);
         mapping_set_gfp_mask(mapping, lo->old_gfp_mask);
         lo->lo_state = Lo_unbound;
  out_putf:
@@ -944,8 +947,11 @@ static int loop_clr_fd(struct loop_device *lo, struct block_device *bdev)
         if (bdev)
                 invalidate_bdev(bdev);
         set_capacity(lo->lo_disk, 0);
-        if (bdev)
+        if (bdev) {
                 bd_set_size(bdev, 0);
+                /* let user-space know about this change */
+                kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE);
+        }
         mapping_set_gfp_mask(filp->f_mapping, gfp);
         lo->lo_state = Lo_unbound;
         /* This is safe: open() is still holding a reference. */
@@ -1189,6 +1195,8 @@ static int loop_set_capacity(struct loop_device *lo, struct block_device *bdev)
         sz <<= 9;
         mutex_lock(&bdev->bd_mutex);
         bd_set_size(bdev, sz);
+        /* let user-space know about the new size */
+        kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE);
         mutex_unlock(&bdev->bd_mutex);
 
  out: