From 3b7d00f99c60b31e1cff0efc6b9178eea3696e27 Mon Sep 17 00:00:00 2001 From: Qu Wenruo Date: Thu, 16 Apr 2015 16:40:39 +0800 Subject: [PATCH] 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: Qu Wenruo Signed-off-by: Chris Mason --- fs/btrfs/qgroup.c | 27 +++++++++++++++++++++++++++ fs/btrfs/qgroup.h | 2 ++ 2 files changed, 29 insertions(+) diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c index 55465d5..7b18fff 100644 --- a/fs/btrfs/qgroup.c +++ b/fs/btrfs/qgroup.c @@ -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) diff --git a/fs/btrfs/qgroup.h b/fs/btrfs/qgroup.h index e58155d0..6fe249f 100644 --- a/fs/btrfs/qgroup.h +++ b/fs/btrfs/qgroup.h @@ -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); -- 2.7.4