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Commit d810ef2b authored by Qu Wenruo's avatar Qu Wenruo Committed by Chris Mason
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btrfs: qgroup: Add function qgroup_update_refcnt(). 



This function is used to update refcnt for qgroups.
And is one of the two core functions used in the new qgroup implement.

This is based on the old update_old/new_refcnt, but provides a unified
logic and behavior.

Signed-off-by: default avatarQu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: default avatarChris Mason <clm@fb.com>
parent c682f9b3

fs/btrfs/qgroup.c

+58 −0
Original line number Diff line number Diff line
@@ -1806,6 +1806,64 @@ static int qgroup_calc_new_refcnt(struct btrfs_fs_info *fs_info, 
	return 0;

}



#define UPDATE_NEW	0

#define UPDATE_OLD	1

/*

 * Walk all of the roots that points to the bytenr and adjust their refcnts.

 */

static int qgroup_update_refcnt(struct btrfs_fs_info *fs_info,

				struct ulist *roots, struct ulist *tmp,

				struct ulist *qgroups, u64 seq, int update_old)

{

	struct ulist_node *unode;

	struct ulist_iterator uiter;

	struct ulist_node *tmp_unode;

	struct ulist_iterator tmp_uiter;

	struct btrfs_qgroup *qg;

	int ret = 0;



	if (!roots)

		return 0;

	ULIST_ITER_INIT(&uiter);

	while ((unode = ulist_next(roots, &uiter))) {

		qg = find_qgroup_rb(fs_info, unode->val);

		if (!qg)

			continue;



		ulist_reinit(tmp);

		ret = ulist_add(qgroups, qg->qgroupid, ptr_to_u64(qg),

				GFP_ATOMIC);

		if (ret < 0)

			return ret;

		ret = ulist_add(tmp, qg->qgroupid, ptr_to_u64(qg), GFP_ATOMIC);

		if (ret < 0)

			return ret;

		ULIST_ITER_INIT(&tmp_uiter);

		while ((tmp_unode = ulist_next(tmp, &tmp_uiter))) {

			struct btrfs_qgroup_list *glist;



			qg = u64_to_ptr(tmp_unode->aux);

			if (update_old)

				btrfs_qgroup_update_old_refcnt(qg, seq, 1);

			else

				btrfs_qgroup_update_new_refcnt(qg, seq, 1);

			list_for_each_entry(glist, &qg->groups, next_group) {

				ret = ulist_add(qgroups, glist->group->qgroupid,

						ptr_to_u64(glist->group),

						GFP_ATOMIC);

				if (ret < 0)

					return ret;

				ret = ulist_add(tmp, glist->group->qgroupid,

						ptr_to_u64(glist->group),

						GFP_ATOMIC);

				if (ret < 0)

					return ret;

			}

		}

	}

	return 0;

}



/*

 * This adjusts the counters for all referenced qgroups if need be.

 */