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Message-Id: <20240506141801.1165315-8-shikemeng@huaweicloud.com> Date: Mon, 6 May 2024 22:17:59 +0800 From: Kemeng Shi <shikemeng@...weicloud.com> To: tytso@....edu, jack@...e.com Cc: linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [PATCH 7/9] jbd2: remove dead equality check of j_commit_[sequence/request] in kjournald2 In kjournald2, two equality checks of j_commit_[sequence/request] are under the same j_state_lock. As j_commit_[sequence/request] are updated concurrently with j_state_lock held during runtime, the second check is unnecessary. The j_commit_sequence is only updated concurrently in jbd2_journal_commit_transaction with j_state_lock held. The j_commit_request is only updated concurrently in __jbd2_log_start_commit with j_state_lock held. Also see comment in struct journal_s about lock rule of j_commit_sequence and j_commit_request. Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com> --- fs/jbd2/journal.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c index 01e33b643e4d..e8f592fbd6e1 100644 --- a/fs/jbd2/journal.c +++ b/fs/jbd2/journal.c @@ -224,8 +224,6 @@ static int kjournald2(void *arg) prepare_to_wait(&journal->j_wait_commit, &wait, TASK_INTERRUPTIBLE); - if (journal->j_commit_sequence != journal->j_commit_request) - should_sleep = 0; transaction = journal->j_running_transaction; if (transaction && time_after_eq(jiffies, transaction->t_expires)) -- 2.30.0
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