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: Qu Wenruo <quwen...@cn.fujitsu.com>
---
fs/btrfs/qgroup.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 58 insertions(+)
diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 9625644..17a974c 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -1702,6 +1702,64 @@ 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.
*/
--
2.3.5
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