linux-kernel - [PATCH 26/29] xfs: return -EAGAIN when nowait meets sync in transaction commit

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Message-Id: <20230825135431.1317785-27-hao.xu@linux.dev>
Date:   Fri, 25 Aug 2023 21:54:28 +0800
From:   Hao Xu <hao.xu@...ux.dev>
To:     io-uring@...r.kernel.org, Jens Axboe <axboe@...nel.dk>
Cc:     Dominique Martinet <asmadeus@...ewreck.org>,
        Pavel Begunkov <asml.silence@...il.com>,
        Christian Brauner <brauner@...nel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Stefan Roesch <shr@...com>, Clay Harris <bugs@...ycon.org>,
        Dave Chinner <david@...morbit.com>,
        "Darrick J . Wong" <djwong@...nel.org>,
        linux-fsdevel@...r.kernel.org, linux-xfs@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-cachefs@...hat.com,
        ecryptfs@...r.kernel.org, linux-nfs@...r.kernel.org,
        linux-unionfs@...r.kernel.org, bpf@...r.kernel.org,
        netdev@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-btrfs@...r.kernel.org, codalist@...a.cs.cmu.edu,
        linux-f2fs-devel@...ts.sourceforge.net, cluster-devel@...hat.com,
        linux-mm@...ck.org, linux-nilfs@...r.kernel.org,
        devel@...ts.orangefs.org, linux-cifs@...r.kernel.org,
        samba-technical@...ts.samba.org, linux-mtd@...ts.infradead.org,
        Wanpeng Li <wanpengli@...cent.com>
Subject: [PATCH 26/29] xfs: return -EAGAIN when nowait meets sync in transaction commit

From: Hao Xu <howeyxu@...cent.com>

if the log transaction is a sync one, let's fail the nowait try and
return -EAGAIN directly since sync transaction means blocked by IO.

Signed-off-by: Hao Xu <howeyxu@...cent.com>
---
 fs/xfs/xfs_trans.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c
index 7988b4c7f36e..f1f84a3dd456 100644
--- a/fs/xfs/xfs_trans.c
+++ b/fs/xfs/xfs_trans.c
@@ -968,12 +968,24 @@ __xfs_trans_commit(
 	xfs_csn_t		commit_seq = 0;
 	int			error = 0;
 	int			sync = tp->t_flags & XFS_TRANS_SYNC;
+	bool			nowait = tp->t_flags & XFS_TRANS_NOWAIT;
+	bool			perm_log = tp->t_flags & XFS_TRANS_PERM_LOG_RES;
 
 	trace_xfs_trans_commit(tp, _RET_IP_);
 
+	if (nowait && sync) {
+		/*
+		 * Currently nowait is only from xfs_vn_update_time()
+		 * so perm_log is always false here, but let's make
+		 * code general.
+		 */
+		if (perm_log)
+			xfs_defer_cancel(tp);
+		goto out_unreserve;
+	}
 	error = xfs_trans_run_precommits(tp);
 	if (error) {
-		if (tp->t_flags & XFS_TRANS_PERM_LOG_RES)
+		if (perm_log)
 			xfs_defer_cancel(tp);
 		goto out_unreserve;
 	}
-- 
2.25.1