Btrfs: Remove the invalid shrink size check up from btrfs_shrink_dev()

Remove an invalid size check up from btrfs_shrink_dev().

The new size should not larger than the device->total_bytes as it was
already verified before coming to here(i.e. new_size < old_size).

Remove invalid check up for btrfs_shrink_dev().

Signed-off-by: Jie Liu <jeff.liu@oracle.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

2 files changed, 1 insertions, 4 deletions

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 8fcf9a59c28d..14c0d2e0790c 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1409,7 +1409,7 @@ static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
                 btrfs_commit_transaction(trans, root);
         } else if (new_size < old_size) {
                 ret = btrfs_shrink_device(device, new_size);
-        }
+        } /* equal, nothing need to do */
 
 out_free:
         kfree(vol_args);
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index eaaf0bf52791..32a88428f6da 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -3059,9 +3059,6 @@ int btrfs_shrink_device(struct btrfs_device *device, u64 new_size)
         u64 old_size = device->total_bytes;
         u64 diff = device->total_bytes - new_size;
 
-        if (new_size >= device->total_bytes)
-                return -EINVAL;
-
         path = btrfs_alloc_path();
         if (!path)
                 return -ENOMEM;