btrfs: don't try to delete RAID stripe-extents if we don't need to

Even if the RAID stripe-tree is not enabled in the filesystem,
do_free_extent_accounting() still calls into btrfs_delete_raid_extent().

Check if the extent in question is on a block-group that has a profile
which is used by RAID stripe-tree before attempting to delete a stripe
extent. Return early if it doesn't, otherwise we're doing a unnecessary
search.

Reviewed-by: Filipe Manana <[email protected]>
Signed-off-by: Johannes Thumshirn <[email protected]>
Signed-off-by: David Sterba <[email protected]>

Author: morbidrsa

fs/btrfs/raid-stripe-tree.c

@@ -59,9 +59,22 @@ int btrfs_delete_raid_extent(struct btrfs_trans_handle *trans, u64 start, u64 le
 	int slot;
 	int ret;
 
-	if (!stripe_root)
+	if (!btrfs_fs_incompat(fs_info, RAID_STRIPE_TREE) || !stripe_root)
 		return 0;
 
+	if (!btrfs_is_testing(fs_info)) {
+		struct btrfs_chunk_map *map;
+		bool use_rst;
+
+		map = btrfs_find_chunk_map(fs_info, start, length);
+		if (!map)
+			return -EINVAL;
+		use_rst = btrfs_need_stripe_tree_update(fs_info, map->type);
+		btrfs_free_chunk_map(map);
+		if (!use_rst)
+			return 0;
+	}
+
 	path = btrfs_alloc_path();
 	if (!path)
 		return -ENOMEM;