netdev - [PATCH 09/11] vfs: error out -EAGAIN if atime needs to be updated

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Date: Sun, 27 Aug 2023 21:28:33 +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 09/11] vfs: error out -EAGAIN if atime needs to be updated

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

To enforce nowait semantics, error out -EAGAIN if atime needs to be
updated.

Signed-off-by: Hao Xu <howeyxu@...cent.com>
---
 fs/inode.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/inode.c b/fs/inode.c
index e83b836f2d09..32d81be65cf9 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1970,6 +1970,9 @@ int touch_atime(const struct path *path, bool nowait)
 	if (!atime_needs_update(path, inode))
 		return 0;
 
+	if (nowait)
+		return -EAGAIN;
+
 	if (!sb_start_write_trylock(inode->i_sb))
 		return 0;
 
-- 
2.25.1