loopdev: move common code into loop_figure_size()

Update block device size in accord with gendisk size and let userspace
know the change in loop_figure_size(). This is a clean up to remove
common code of loop_figure_size()'s two callers.

Signed-off-by: Guo Chao <yan@linux.vnet.ibm.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Guo Chao <yan@linux.vnet.ibm.com>
Cc: M. Hindess <hindessm@uk.ibm.com>
Cc: Nikanth Karthikesan <knikanth@suse.de>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 7 insertions, 24 deletions

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index ed850366f22d..6579f69fd7a4 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -190,6 +190,7 @@ figure_loop_size(struct loop_device *lo, loff_t offset, loff_t sizelimit)
 {
         loff_t size = get_size(offset, sizelimit, lo->lo_backing_file);
         sector_t x = (sector_t)size;
+        struct block_device *bdev = lo->lo_device;
 
         if (unlikely((loff_t)x != size))
                 return -EFBIG;
@@ -198,6 +199,9 @@ figure_loop_size(struct loop_device *lo, loff_t offset, loff_t sizelimit)
         if (lo->lo_sizelimit != sizelimit)
                 lo->lo_sizelimit = sizelimit;
         set_capacity(lo->lo_disk, x);
+        bd_set_size(bdev, (loff_t)get_capacity(bdev->bd_disk) << 9);
+        /* let user-space know about the new size */
+        kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE);
         return 0;
 }
 
@@ -1091,15 +1095,10 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info)
                 return err;
 
         if (lo->lo_offset != info->lo_offset ||
-            lo->lo_sizelimit != info->lo_sizelimit) {
-                struct block_device *bdev = lo->lo_device;
-
+            lo->lo_sizelimit != info->lo_sizelimit)
                 if (figure_loop_size(lo, info->lo_offset, info->lo_sizelimit))
                         return -EFBIG;
 
-                bd_set_size(bdev, (loff_t)get_capacity(bdev->bd_disk) << 9);
-                kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE);
-        }
         loop_config_discard(lo);
 
         memcpy(lo->lo_file_name, info->lo_file_name, LO_NAME_SIZE);
@@ -1276,26 +1275,10 @@ loop_get_status64(struct loop_device *lo, struct loop_info64 __user *arg) {
 
 static int loop_set_capacity(struct loop_device *lo, struct block_device *bdev)
 {
-        int err;
-        sector_t sec;
-        loff_t sz;
-
-        err = -ENXIO;
         if (unlikely(lo->lo_state != Lo_bound))
-                goto out;
-        err = figure_loop_size(lo, lo->lo_offset, lo->lo_sizelimit);
-        if (unlikely(err))
-                goto out;
-        sec = get_capacity(lo->lo_disk);
-        /* the width of sector_t may be narrow for bit-shift */
-        sz = sec;
-        sz <<= 9;
-        bd_set_size(bdev, sz);
-        /* let user-space know about the new size */
-        kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE);
+                return -ENXIO;
 
- out:
-        return err;
+        return figure_loop_size(lo, lo->lo_offset, lo->lo_sizelimit);
 }
 
 static int lo_ioctl(struct block_device *bdev, fmode_t mode,