It's no longer expected to call this function with an open transaction
so all the hacks concerning this can be removed. In fact it'll
constitute a bug to call this function with a transaction already held
so WARN in this case.
Signed-off-by: Nikolay Borisov <nbori...@suse.com>
---
fs/btrfs/qgroup.c | 35 +++++++----------------------------
1 file changed, 7 insertions(+), 28 deletions(-)
diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index fbef95bc3557..c9e82e0c88e3 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -3535,37 +3535,19 @@ static int try_flush_qgroup(struct btrfs_root *root)
{
struct btrfs_trans_handle *trans;
int ret;
- bool can_commit = true;
- /*
- * If current process holds a transaction, we shouldn't flush, as we
- * assume all space reservation happens before a transaction handle is
- * held.
- *
- * But there are cases like btrfs_delayed_item_reserve_metadata() where
- * we try to reserve space with one transction handle already held.
- * In that case we can't commit transaction, but at least try to end it
- * and hope the started data writes can free some space.
- */
- if (current->journal_info &&
- current->journal_info != BTRFS_SEND_TRANS_STUB)
- can_commit = false;
+ /* Can't hold an open transaction or we run the risk of deadlocking. */
+ ASSERT(current->journal_info == NULL ||
+ current->journal_info == BTRFS_SEND_TRANS_STUB);
+ if (WARN_ON(current->journal_info &&
+ current->journal_info != BTRFS_SEND_TRANS_STUB))
+ return 0;
/*
* We don't want to run flush again and again, so if there is a running
* one, we won't try to start a new flush, but exit directly.
*/
if (test_and_set_bit(BTRFS_ROOT_QGROUP_FLUSHING, &root->state)) {
- /*
- * We are already holding a transaction, thus we can block other
- * threads from flushing. So exit right now. This increases
- * the chance of EDQUOT for heavy load and near limit cases.
- * But we can argue that if we're already near limit, EDQUOT is
- * unavoidable anyway.
- */
- if (!can_commit)
- return 0;
-
wait_event(root->qgroup_flush_wait,
!test_bit(BTRFS_ROOT_QGROUP_FLUSHING, &root->state));
return 0;
@@ -3582,10 +3564,7 @@ static int try_flush_qgroup(struct btrfs_root *root)
goto out;
}
- if (can_commit)
- ret = btrfs_commit_transaction(trans);
- else
- ret = btrfs_end_transaction(trans);
+ ret = btrfs_commit_transaction(trans);
out:
clear_bit(BTRFS_ROOT_QGROUP_FLUSHING, &root->state);
wake_up(&root->qgroup_flush_wait);
--
2.25.1
