Commit b9d97cff authored by Josef Bacik's avatar Josef Bacik Committed by David Sterba
Browse files

btrfs: move comments to btrfs_loop_type definition 



Some of these loop types aren't described, and they should be with the
definitions to make it easier to tell what each of them do.

Reviewed-by: default avatarBoris Burkov <boris@bur.io>
Signed-off-by: default avatarJosef Bacik <josef@toxicpanda.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 7f9879eb

fs/btrfs/extent-tree.c

+28 −9
Original line number Diff line number Diff line
@@ -3329,11 +3329,38 @@ int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_ref *ref) 
}



enum btrfs_loop_type {

	/*

	 * Start caching block groups but do not wait for progress or for them

	 * to be done.

	 */

	LOOP_CACHING_NOWAIT,



	/*

	 * Wait for the block group free_space >= the space we're waiting for if

	 * the block group isn't cached.

	 */

	LOOP_CACHING_WAIT,



	/*

	 * Allow allocations to happen from block groups that do not yet have a

	 * size classification.

	 */

	LOOP_UNSET_SIZE_CLASS,



	/*

	 * Allocate a chunk and then retry the allocation.

	 */

	LOOP_ALLOC_CHUNK,



	/*

	 * Ignore the size class restrictions for this allocation.

	 */

	LOOP_WRONG_SIZE_CLASS,



	/*

	 * Ignore the empty size, only try to allocate the number of bytes

	 * needed for this allocation.

	 */

	LOOP_NO_EMPTY_SIZE,

};
@@ -3927,15 +3954,7 @@ static int find_free_extent_update_loop(struct btrfs_fs_info *fs_info, 
	if (ffe_ctl->index < BTRFS_NR_RAID_TYPES)

		return 1;



	/*

	 * LOOP_CACHING_NOWAIT, search partially cached block groups, kicking

	 *			caching kthreads as we move along

	 * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching

	 * LOOP_UNSET_SIZE_CLASS, allow unset size class

	 * LOOP_ALLOC_CHUNK, force a chunk allocation and try again

	 * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try

	 *		       again

	 */

	/* See the comments for btrfs_loop_type for an explanation of the phases. */

	if (ffe_ctl->loop < LOOP_NO_EMPTY_SIZE) {

		ffe_ctl->index = 0;

		/*