Btrfs: add __get_block_group_index() helper

Add __get_block_group_index() helper to be able to derive block group
index from an arbitary set of flags.  Implement get_block_group_index()
in terms of it.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index faf52e030315787cd9c8afc71c971d44a9c0aa3e..c44aa9680789b9f6071046ce555e279ecadee7b2 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -5248,22 +5248,29 @@ wait_block_group_cache_done(struct btrfs_block_group_cache *cache)
        return 0;
 }
 
-static int get_block_group_index(struct btrfs_block_group_cache *cache)
+static int __get_block_group_index(u64 flags)
 {
        int index;
-       if (cache->flags & BTRFS_BLOCK_GROUP_RAID10)
+
+       if (flags & BTRFS_BLOCK_GROUP_RAID10)
                index = 0;
-       else if (cache->flags & BTRFS_BLOCK_GROUP_RAID1)
+       else if (flags & BTRFS_BLOCK_GROUP_RAID1)
                index = 1;
-       else if (cache->flags & BTRFS_BLOCK_GROUP_DUP)
+       else if (flags & BTRFS_BLOCK_GROUP_DUP)
                index = 2;
-       else if (cache->flags & BTRFS_BLOCK_GROUP_RAID0)
+       else if (flags & BTRFS_BLOCK_GROUP_RAID0)
                index = 3;
        else
                index = 4;
+
        return index;
 }
 
+static int get_block_group_index(struct btrfs_block_group_cache *cache)
+{
+       return __get_block_group_index(cache->flags);
+}
+
 enum btrfs_loop_type {
        LOOP_CACHING_NOWAIT = 0,
        LOOP_CACHING_WAIT = 1,