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Btrfs: fix warning when creating snapshots 

Creating snapshot passes extent_root to commit its transaction,
but it can lead to the warning of checking root for quota in
the __btrfs_end_transaction() when someone else is committing
the current transaction.  Since we've recorded the needed root
in trans_handle, just use it to get rid of the warning.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
Liu Bo 2013-03-13 07:43:03 -06:00 committed by Chris Mason
parent 720f1e2060
commit 7c2ec3f073
1 changed files with 5 additions and 6 deletions
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11
fs/btrfs/transaction.c
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@ -626,14 +626,13 @@ static int __btrfs_end_transaction(struct btrfs_trans_handle *trans,
btrfs_trans_release_metadata(trans, root);
trans->block_rsv = NULL;
/*
* the same root has to be passed to start_transaction and
* end_transaction. Subvolume quota depends on this.
*/
WARN_ON(trans->root != root);
if (trans->qgroup_reserved) {
btrfs_qgroup_free(root, trans->qgroup_reserved);
/*
* the same root has to be passed here between start_transaction
* and end_transaction. Subvolume quota depends on this.
*/
btrfs_qgroup_free(trans->root, trans->qgroup_reserved);
trans->qgroup_reserved = 0;
}