Commit 1e0e9d57 authored by Boris Burkov's avatar Boris Burkov Committed by David Sterba
Browse files

btrfs: add helper for recording simple quota deltas 



Rather than re-computing shared/exclusive ownership based on backrefs
and walking roots for implicit backrefs, simple quotas does an increment
when creating an extent and a decrement when deleting it. Add the API
for the extent item code to use to track those events.

Signed-off-by: default avatarBoris Burkov <boris@bur.io>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 6ed05643

fs/btrfs/qgroup.c

+46 −0
Original line number Diff line number Diff line
@@ -4586,3 +4586,49 @@ void btrfs_qgroup_destroy_extent_records(struct btrfs_transaction *trans) 
	}

	*root = RB_ROOT;

}



int btrfs_record_squota_delta(struct btrfs_fs_info *fs_info,

			      struct btrfs_squota_delta *delta)

{

	int ret;

	struct btrfs_qgroup *qgroup;

	struct btrfs_qgroup *qg;

	LIST_HEAD(qgroup_list);

	u64 root = delta->root;

	u64 num_bytes = delta->num_bytes;

	const int sign = (delta->is_inc ? 1 : -1);



	if (btrfs_qgroup_mode(fs_info) != BTRFS_QGROUP_MODE_SIMPLE)

		return 0;



	if (!is_fstree(root))

		return 0;



	spin_lock(&fs_info->qgroup_lock);

	qgroup = find_qgroup_rb(fs_info, root);

	if (!qgroup) {

		ret = -ENOENT;

		goto out;

	}



	ret = 0;

	qgroup_iterator_add(&qgroup_list, qgroup);

	list_for_each_entry(qg, &qgroup_list, iterator) {

		struct btrfs_qgroup_list *glist;



		qg->excl += num_bytes * sign;

		qg->rfer += num_bytes * sign;

		qgroup_dirty(fs_info, qg);



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

			qgroup_iterator_add(&qgroup_list, glist->group);

	}

	qgroup_iterator_clean(&qgroup_list);



out:

	spin_unlock(&fs_info->qgroup_lock);

	if (!ret && delta->rsv_bytes)

		btrfs_qgroup_free_refroot(fs_info, root, delta->rsv_bytes,

					  BTRFS_QGROUP_RSV_DATA);

	return ret;

}

fs/btrfs/qgroup.h

+15 −0
Original line number Diff line number Diff line
@@ -269,6 +269,19 @@ struct btrfs_qgroup { 
	struct kobject kobj;

};



struct btrfs_squota_delta {

	/* The fstree root this delta counts against. */

	u64 root;

	/* The number of bytes in the extent being counted. */

	u64 num_bytes;

	/* The number of bytes reserved for this extent. */

	u64 rsv_bytes;

	/* Whether we are using or freeing the extent. */

	bool is_inc;

	/* Whether the extent is data or metadata. */

	bool is_data;

};



static inline u64 btrfs_qgroup_subvolid(u64 qgroupid)

{

	return (qgroupid & ((1ULL << BTRFS_QGROUP_LEVEL_SHIFT) - 1));
@@ -407,5 +420,7 @@ int btrfs_qgroup_trace_subtree_after_cow(struct btrfs_trans_handle *trans, 
		struct btrfs_root *root, struct extent_buffer *eb);

void btrfs_qgroup_destroy_extent_records(struct btrfs_transaction *trans);

bool btrfs_check_quota_leak(struct btrfs_fs_info *fs_info);

int btrfs_record_squota_delta(struct btrfs_fs_info *fs_info,

			      struct btrfs_squota_delta *delta);



#endif