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btrfs: qgroup: use qgroup_iterator_nested to in qgroup_update_refcnt()
The ulist @qgroups is utilized to record all involved qgroups from both old and new roots inside btrfs_qgroup_account_extent(). Due to the fact that qgroup_update_refcnt() itself is already utilizing qgroup_iterator, here we have to introduce another list_head, btrfs_qgroup::nested_iterator, allowing nested iteration. Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo
David Sterba
parent
a4a81383fb
commit
dce28769a3
@ -209,6 +209,7 @@ static struct btrfs_qgroup *add_qgroup_rb(struct btrfs_fs_info *fs_info,
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INIT_LIST_HEAD(&qgroup->members);
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INIT_LIST_HEAD(&qgroup->dirty);
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INIT_LIST_HEAD(&qgroup->iterator);
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INIT_LIST_HEAD(&qgroup->nested_iterator);
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rb_link_node(&qgroup->node, parent, p);
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rb_insert_color(&qgroup->node, &fs_info->qgroup_tree);
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@ -2417,22 +2418,39 @@ out:
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return ret;
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}
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static void qgroup_iterator_nested_add(struct list_head *head, struct btrfs_qgroup *qgroup)
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{
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if (!list_empty(&qgroup->nested_iterator))
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return;
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list_add_tail(&qgroup->nested_iterator, head);
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}
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static void qgroup_iterator_nested_clean(struct list_head *head)
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{
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while (!list_empty(head)) {
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struct btrfs_qgroup *qgroup;
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qgroup = list_first_entry(head, struct btrfs_qgroup, nested_iterator);
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list_del_init(&qgroup->nested_iterator);
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}
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}
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#define UPDATE_NEW 0
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#define UPDATE_OLD 1
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/*
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* Walk all of the roots that points to the bytenr and adjust their refcnts.
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*/
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static int qgroup_update_refcnt(struct btrfs_fs_info *fs_info,
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struct ulist *roots, struct ulist *qgroups,
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u64 seq, int update_old)
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static void qgroup_update_refcnt(struct btrfs_fs_info *fs_info,
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struct ulist *roots, struct list_head *qgroups,
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u64 seq, int update_old)
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{
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struct ulist_node *unode;
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struct ulist_iterator uiter;
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struct btrfs_qgroup *qg;
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int ret = 0;
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if (!roots)
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return 0;
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return;
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ULIST_ITER_INIT(&uiter);
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while ((unode = ulist_next(roots, &uiter))) {
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LIST_HEAD(tmp);
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@ -2441,10 +2459,7 @@ static int qgroup_update_refcnt(struct btrfs_fs_info *fs_info,
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if (!qg)
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continue;
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ret = ulist_add(qgroups, qg->qgroupid, qgroup_to_aux(qg),
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GFP_ATOMIC);
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if (ret < 0)
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return ret;
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qgroup_iterator_nested_add(qgroups, qg);
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qgroup_iterator_add(&tmp, qg);
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list_for_each_entry(qg, &tmp, iterator) {
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struct btrfs_qgroup_list *glist;
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@ -2455,17 +2470,12 @@ static int qgroup_update_refcnt(struct btrfs_fs_info *fs_info,
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btrfs_qgroup_update_new_refcnt(qg, seq, 1);
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list_for_each_entry(glist, &qg->groups, next_group) {
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ret = ulist_add(qgroups, glist->group->qgroupid,
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qgroup_to_aux(glist->group),
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GFP_ATOMIC);
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if (ret < 0)
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return ret;
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qgroup_iterator_nested_add(qgroups, glist->group);
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qgroup_iterator_add(&tmp, glist->group);
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}
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}
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qgroup_iterator_clean(&tmp);
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}
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return 0;
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}
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/*
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@ -2504,22 +2514,16 @@ static int qgroup_update_refcnt(struct btrfs_fs_info *fs_info,
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* But this time we don't need to consider other things, the codes and logic
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* is easy to understand now.
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*/
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static int qgroup_update_counters(struct btrfs_fs_info *fs_info,
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struct ulist *qgroups,
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u64 nr_old_roots,
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u64 nr_new_roots,
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u64 num_bytes, u64 seq)
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static void qgroup_update_counters(struct btrfs_fs_info *fs_info,
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struct list_head *qgroups, u64 nr_old_roots,
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u64 nr_new_roots, u64 num_bytes, u64 seq)
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{
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struct ulist_node *unode;
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struct ulist_iterator uiter;
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struct btrfs_qgroup *qg;
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u64 cur_new_count, cur_old_count;
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ULIST_ITER_INIT(&uiter);
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while ((unode = ulist_next(qgroups, &uiter))) {
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list_for_each_entry(qg, qgroups, nested_iterator) {
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u64 cur_new_count, cur_old_count;
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bool dirty = false;
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qg = unode_aux_to_qgroup(unode);
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cur_old_count = btrfs_qgroup_get_old_refcnt(qg, seq);
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cur_new_count = btrfs_qgroup_get_new_refcnt(qg, seq);
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@ -2590,7 +2594,6 @@ static int qgroup_update_counters(struct btrfs_fs_info *fs_info,
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if (dirty)
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qgroup_dirty(fs_info, qg);
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}
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return 0;
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}
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/*
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@ -2627,7 +2630,7 @@ int btrfs_qgroup_account_extent(struct btrfs_trans_handle *trans, u64 bytenr,
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struct ulist *new_roots)
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{
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struct btrfs_fs_info *fs_info = trans->fs_info;
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struct ulist *qgroups = NULL;
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LIST_HEAD(qgroups);
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u64 seq;
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u64 nr_new_roots = 0;
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u64 nr_old_roots = 0;
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@ -2661,11 +2664,6 @@ int btrfs_qgroup_account_extent(struct btrfs_trans_handle *trans, u64 bytenr,
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trace_btrfs_qgroup_account_extent(fs_info, trans->transid, bytenr,
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num_bytes, nr_old_roots, nr_new_roots);
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qgroups = ulist_alloc(GFP_NOFS);
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if (!qgroups) {
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ret = -ENOMEM;
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goto out_free;
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}
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mutex_lock(&fs_info->qgroup_rescan_lock);
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if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
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if (fs_info->qgroup_rescan_progress.objectid <= bytenr) {
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@ -2680,26 +2678,21 @@ int btrfs_qgroup_account_extent(struct btrfs_trans_handle *trans, u64 bytenr,
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seq = fs_info->qgroup_seq;
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/* Update old refcnts using old_roots */
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ret = qgroup_update_refcnt(fs_info, old_roots, qgroups, seq, UPDATE_OLD);
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if (ret < 0)
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goto out;
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qgroup_update_refcnt(fs_info, old_roots, &qgroups, seq, UPDATE_OLD);
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/* Update new refcnts using new_roots */
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ret = qgroup_update_refcnt(fs_info, new_roots, qgroups, seq, UPDATE_NEW);
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if (ret < 0)
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goto out;
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qgroup_update_refcnt(fs_info, new_roots, &qgroups, seq, UPDATE_NEW);
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qgroup_update_counters(fs_info, qgroups, nr_old_roots, nr_new_roots,
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qgroup_update_counters(fs_info, &qgroups, nr_old_roots, nr_new_roots,
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num_bytes, seq);
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/*
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* Bump qgroup_seq to avoid seq overlap
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*/
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fs_info->qgroup_seq += max(nr_old_roots, nr_new_roots) + 1;
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out:
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spin_unlock(&fs_info->qgroup_lock);
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out_free:
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ulist_free(qgroups);
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qgroup_iterator_nested_clean(&qgroups);
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ulist_free(old_roots);
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ulist_free(new_roots);
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return ret;
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@ -229,6 +229,24 @@ struct btrfs_qgroup {
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* finished.
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*/
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struct list_head iterator;
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/*
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* For nested iterator usage.
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*
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* Here we support at most one level of nested iterator calls like:
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*
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* LIST_HEAD(all_qgroups);
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* {
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* LIST_HEAD(local_qgroups);
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* qgroup_iterator_add(local_qgroups, qg);
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* qgroup_iterator_nested_add(all_qgroups, qg);
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* do_some_work(local_qgroups);
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* qgroup_iterator_clean(local_qgroups);
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* }
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* do_some_work(all_qgroups);
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* qgroup_iterator_nested_clean(all_qgroups);
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*/
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struct list_head nested_iterator;
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struct rb_node node; /* tree of qgroups */
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/*
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