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Btrfs: avoid deadlock on transaction waiting list 

Only let one trans handle to wait for other handles, otherwise we
will get ABBA issues.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Liu Bo 2013-03-04 16:25:41 +00:00 committed by Josef Bacik
parent 0f788c5819
commit 66b6135b7c
1 changed files with 7 additions and 0 deletions
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7
fs/btrfs/transaction.c
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@ -1457,6 +1457,13 @@ static void cleanup_transaction(struct btrfs_trans_handle *trans,
btrfs_abort_transaction(trans, root, err);
spin_lock(&root->fs_info->trans_lock);
if (list_empty(&cur_trans->list)) {
spin_unlock(&root->fs_info->trans_lock);
btrfs_end_transaction(trans, root);
return;
}
list_del_init(&cur_trans->list);
if (cur_trans == root->fs_info->running_transaction) {
root->fs_info->trans_no_join = 1;