linux-ext4 - [PATCH v11 26/26] locking/lockdep, fs/jbd2: Use a weaker annotation in journal handling

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Message-Id: <20240124115938.80132-27-byungchul@sk.com>
Date: Wed, 24 Jan 2024 20:59:37 +0900
From: Byungchul Park <byungchul@...com>
To: linux-kernel@...r.kernel.org
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Subject: [PATCH v11 26/26] locking/lockdep, fs/jbd2: Use a weaker annotation in journal handling

jbd2 journal handling code doesn't want any jbd2_might_wait_for_commit()
to be between start_this_handle() and stop_this_handle(). So it marks
the region with rwsem_acquire_read() and rwsem_release().

However, the annotation is too strong for that purpose. We don't have to
use more than try lock annotation for that.

Furthermore, now that Dept was introduced, false positive alarms was
reported by that. Replaced it with try lock annotation.

Signed-off-by: Byungchul Park <byungchul@...com>
---
 fs/jbd2/transaction.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index 5f08b5fd105a..2c159a547e15 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -460,7 +460,7 @@ static int start_this_handle(journal_t *journal, handle_t *handle,
 	read_unlock(&journal->j_state_lock);
 	current->journal_info = handle;
 
-	rwsem_acquire_read(&journal->j_trans_commit_map, 0, 0, _THIS_IP_);
+	rwsem_acquire_read(&journal->j_trans_commit_map, 0, 1, _THIS_IP_);
 	jbd2_journal_free_transaction(new_transaction);
 	/*
 	 * Ensure that no allocations done while the transaction is open are
-- 
2.17.1