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>

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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

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2

fs/btrfs/qgroup.h

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