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Commit 3b7d00f9 authored by Qu Wenruo's avatar Qu Wenruo Committed by Chris Mason
Browse files

btrfs: qgroup: Add new function to record old_roots. 



Add function btrfs_qgroup_prepare_account_extents() to get old_roots
which are needed for qgroup.

We do it in commit_transaction() and before switch_roots(), and only
search commit_root, so it gives a quite accurate view for previous
transaction.

With old_roots from previous transaction, we can use it to do accurate
account with current transaction.

Signed-off-by: default avatarQu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: default avatarChris Mason <clm@fb.com>
parent 3368d001

fs/btrfs/qgroup.c

+27 −0
Original line number Diff line number Diff line
@@ -1553,6 +1553,33 @@ int btrfs_qgroup_record_ref(struct btrfs_trans_handle *trans, 
	return 0;

}



int btrfs_qgroup_prepare_account_extents(struct btrfs_trans_handle *trans,

					 struct btrfs_fs_info *fs_info)

{

	struct btrfs_qgroup_extent_record *record;

	struct btrfs_delayed_ref_root *delayed_refs;

	struct rb_node *node;

	int ret = 0;



	delayed_refs = &trans->transaction->delayed_refs;



	/*

	 * No need to do lock, since this function will only be called in

	 * btrfs_commmit_transaction().

	 */

	node = rb_first(&delayed_refs->dirty_extent_root);

	while (node) {

		record = rb_entry(node, struct btrfs_qgroup_extent_record,

				  node);

		ret = btrfs_find_all_roots(NULL, fs_info, record->bytenr, 0,

					   &record->old_roots);

		if (ret < 0)

			break;

		node = rb_next(node);

	}

	return ret;

}



struct btrfs_qgroup_extent_record

*btrfs_qgroup_insert_dirty_extent(struct btrfs_delayed_ref_root *delayed_refs,

				  struct btrfs_qgroup_extent_record *record)

fs/btrfs/qgroup.h

+2 −0
Original line number Diff line number Diff line
@@ -98,6 +98,8 @@ int btrfs_qgroup_record_ref(struct btrfs_trans_handle *trans, 
			    u64 bytenr, u64 num_bytes,

			    enum btrfs_qgroup_operation_type type,

			    int mod_seq);

int btrfs_qgroup_prepare_account_extents(struct btrfs_trans_handle *trans,

					 struct btrfs_fs_info *fs_info);

struct btrfs_qgroup_extent_record

*btrfs_qgroup_insert_dirty_extent(struct btrfs_delayed_ref_root *delayed_refs,

				  struct btrfs_qgroup_extent_record *record);