btrfs_read_block_groups: Use enums to index

 btrfs_space_info->block_groups.

The current code uses integer literals to index
btrfs_space_info->block_groups[] array. Instead use corresponding
enums from 'enum btrfs_raid_types'.

Signed-off-by: chandan <chandan@linux.vnet.ibm.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 99aa9b77e9481b8bc3df9315f9b7cf96b45a582f..a770a631843359cb10b5515421ed64c55511a1a5 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -8441,9 +8441,13 @@ int btrfs_read_block_groups(struct btrfs_root *root)
                 * avoid allocating from un-mirrored block group if there are
                 * mirrored block groups.
                 */
-               list_for_each_entry(cache, &space_info->block_groups[3], list)
+               list_for_each_entry(cache,
+                               &space_info->block_groups[BTRFS_RAID_RAID0],
+                               list)
                        set_block_group_ro(cache, 1);
-               list_for_each_entry(cache, &space_info->block_groups[4], list)
+               list_for_each_entry(cache,
+                               &space_info->block_groups[BTRFS_RAID_SINGLE],
+                               list)
                        set_block_group_ro(cache, 1);
        }