Commit 546adb0d authored by Jan Schmidt's avatar Jan Schmidt
Browse files

Btrfs: hooks for qgroup to record delayed refs 



Hooks into qgroup code to record refs and into transaction commit.
This is the main entry point for qgroup. Basically every change in
extent backrefs got accounted to the appropriate qgroups.

Signed-off-by: default avatarArne Jansen <sensille@gmx.net>
Signed-off-by: default avatarJan Schmidt <list.btrfs@jan-o-sch.net>
parent bcef60f2

fs/btrfs/delayed-ref.c

+10 −6
Original line number Diff line number Diff line
@@ -529,8 +529,8 @@ static noinline void add_delayed_tree_ref(struct btrfs_fs_info *fs_info, 
	ref->is_head = 0;

	ref->in_tree = 1;



	if (is_fstree(ref_root))

		seq = btrfs_inc_tree_mod_seq(fs_info);

	if (need_ref_seq(for_cow, ref_root))

		seq = btrfs_get_tree_mod_seq(fs_info, &trans->delayed_ref_elem);

	ref->seq = seq;



	full_ref = btrfs_delayed_node_to_tree_ref(ref);
@@ -588,8 +588,8 @@ static noinline void add_delayed_data_ref(struct btrfs_fs_info *fs_info, 
	ref->is_head = 0;

	ref->in_tree = 1;



	if (is_fstree(ref_root))

		seq = btrfs_inc_tree_mod_seq(fs_info);

	if (need_ref_seq(for_cow, ref_root))

		seq = btrfs_get_tree_mod_seq(fs_info, &trans->delayed_ref_elem);

	ref->seq = seq;



	full_ref = btrfs_delayed_node_to_data_ref(ref);
@@ -662,10 +662,12 @@ int btrfs_add_delayed_tree_ref(struct btrfs_fs_info *fs_info, 
	add_delayed_tree_ref(fs_info, trans, &ref->node, bytenr,

				   num_bytes, parent, ref_root, level, action,

				   for_cow);

	if (!is_fstree(ref_root) &&

	if (!need_ref_seq(for_cow, ref_root) &&

	    waitqueue_active(&fs_info->tree_mod_seq_wait))

		wake_up(&fs_info->tree_mod_seq_wait);

	spin_unlock(&delayed_refs->lock);

	if (need_ref_seq(for_cow, ref_root))

		btrfs_qgroup_record_ref(trans, &ref->node, extent_op);



	return 0;

}
@@ -711,10 +713,12 @@ int btrfs_add_delayed_data_ref(struct btrfs_fs_info *fs_info, 
	add_delayed_data_ref(fs_info, trans, &ref->node, bytenr,

				   num_bytes, parent, ref_root, owner, offset,

				   action, for_cow);

	if (!is_fstree(ref_root) &&

	if (!need_ref_seq(for_cow, ref_root) &&

	    waitqueue_active(&fs_info->tree_mod_seq_wait))

		wake_up(&fs_info->tree_mod_seq_wait);

	spin_unlock(&delayed_refs->lock);

	if (need_ref_seq(for_cow, ref_root))

		btrfs_qgroup_record_ref(trans, &ref->node, extent_op);



	return 0;

}

fs/btrfs/delayed-ref.h

+19 −0
Original line number Diff line number Diff line
@@ -179,6 +179,25 @@ int btrfs_check_delayed_seq(struct btrfs_fs_info *fs_info, 
			    struct btrfs_delayed_ref_root *delayed_refs,

			    u64 seq);



/*

 * delayed refs with a ref_seq > 0 must be held back during backref walking.

 * this only applies to items in one of the fs-trees. for_cow items never need

 * to be held back, so they won't get a ref_seq number.

 */

static inline int need_ref_seq(int for_cow, u64 rootid)

{

	if (for_cow)

		return 0;



	if (rootid == BTRFS_FS_TREE_OBJECTID)

		return 1;



	if ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID)

		return 1;



	return 0;

}



/*

 * a node might live in a head or a regular ref, this lets you

 * test for the proper type to use.

fs/btrfs/transaction.c

+7 −0
Original line number Diff line number Diff line
@@ -795,6 +795,13 @@ static noinline int commit_cowonly_roots(struct btrfs_trans_handle *trans, 
	ret = btrfs_run_dev_stats(trans, root->fs_info);

	BUG_ON(ret);



	ret = btrfs_run_qgroups(trans, root->fs_info);

	BUG_ON(ret);



	/* run_qgroups might have added some more refs */

	ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1);

	BUG_ON(ret);



	while (!list_empty(&fs_info->dirty_cowonly_roots)) {

		next = fs_info->dirty_cowonly_roots.next;

		list_del_init(next);

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