btrfs: restructure find_free_dev_extent()

- make it return the start position and length of the max free space when it can
  not find a suitable free space.
- make it more readability

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 3c71d95111fe..1e1c9a177626 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -8099,7 +8099,7 @@ int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr)
         mutex_lock(&root->fs_info->chunk_mutex);
         list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) {
                 u64 min_free = btrfs_block_group_used(&block_group->item);
-                u64 dev_offset, max_avail;
+                u64 dev_offset;
 
                 /*
                  * check to make sure we can actually find a chunk with enough
@@ -8107,7 +8107,7 @@ int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr)
                  */
                 if (device->total_bytes > device->bytes_used + min_free) {
                         ret = find_free_dev_extent(NULL, device, min_free,
-                                                   &dev_offset, &max_avail);
+                                                   &dev_offset, NULL);
                         if (!ret)
                                 break;
                         ret = -1;