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btrfs: qgroup: Add new function to record old_roots.

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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 <quwenruo@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Qu Wenruo 2015-04-16 16:40:39 +08:00 committed by Chris Mason
parent 3368d001ba
commit 3b7d00f99c
2 changed files with 29 additions and 0 deletions
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27
fs/btrfs/qgroup.c
View File

@ -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)

2
fs/btrfs/qgroup.h
View File

@ -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);