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

[Jeff Liu <jeff.liu@oracle.com>]

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>
---
 fs/btrfs/ioctl.c   |    2 +-
 fs/btrfs/volumes.c |    3 ---
 2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 9df50fa..a747da9 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1383,7 +1383,7 @@ 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 88b969a..8fda4fb 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -3038,9 +3038,6 @@ 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;
-- 
1.7.9.5