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Commit cb49a87b authored by Nikolay Borisov's avatar Nikolay Borisov Committed by David Sterba
Browse files

btrfs: Factor out common delayed refs init code 



THe majority of the init code for struct btrfs_delayed_ref_node is
duplicated in add_delayed_data_ref and add_delayed_tree_ref. Factor out
the common bits in init_delayed_ref_common. This function is going to be
used in future patches to clean that up. No functional changes.

Signed-off-by: default avatarNikolay Borisov <nborisov@suse.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 891f41cb

fs/btrfs/delayed-ref.c

+51 −0
Original line number Diff line number Diff line
@@ -644,6 +644,57 @@ add_delayed_ref_head(struct btrfs_trans_handle *trans, 
	return head_ref;

}



/*

 * init_delayed_ref_common - Initialize the structure which represents a

 *			     modification to a an extent.

 *

 * @fs_info:    Internal to the mounted filesystem mount structure.

 *

 * @ref:	The structure which is going to be initialized.

 *

 * @bytenr:	The logical address of the extent for which a modification is

 *		going to be recorded.

 *

 * @num_bytes:  Size of the extent whose modification is being recorded.

 *

 * @ref_root:	The id of the root where this modification has originated, this

 *		can be either one of the well-known metadata trees or the

 *		subvolume id which references this extent.

 *

 * @action:	Can be one of BTRFS_ADD_DELAYED_REF/BTRFS_DROP_DELAYED_REF or

 *		BTRFS_ADD_DELAYED_EXTENT

 *

 * @ref_type:	Holds the type of the extent which is being recorded, can be

 *		one of BTRFS_SHARED_BLOCK_REF_KEY/BTRFS_TREE_BLOCK_REF_KEY

 *		when recording a metadata extent or BTRFS_SHARED_DATA_REF_KEY/

 *		BTRFS_EXTENT_DATA_REF_KEY when recording data extent

 */

static void init_delayed_ref_common(struct btrfs_fs_info *fs_info,

				    struct btrfs_delayed_ref_node *ref,

				    u64 bytenr, u64 num_bytes, u64 ref_root,

				    int action, u8 ref_type)

{

	u64 seq = 0;



	if (action == BTRFS_ADD_DELAYED_EXTENT)

		action = BTRFS_ADD_DELAYED_REF;



	if (is_fstree(ref_root))

		seq = atomic64_read(&fs_info->tree_mod_seq);



	refcount_set(&ref->refs, 1);

	ref->bytenr = bytenr;

	ref->num_bytes = num_bytes;

	ref->ref_mod = 1;

	ref->action = action;

	ref->is_head = 0;

	ref->in_tree = 1;

	ref->seq = seq;

	ref->type = ref_type;

	RB_CLEAR_NODE(&ref->ref_node);

	INIT_LIST_HEAD(&ref->add_list);

}



/*

 * helper to insert a delayed tree ref into the rbtree.

 */