netdev - [PATCH 08/11] vfs: move file_accessed() to the beginning of iterate

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Date: Sun, 27 Aug 2023 21:28:32 +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 08/11] vfs: move file_accessed() to the beginning of iterate_dir()

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

Move file_accessed() to the beginning of iterate_dir() so that we don't
need to rollback all the work done when file_accessed() returns -EAGAIN
at the end of getdents.

Signed-off-by: Hao Xu <howeyxu@...cent.com>
---
 fs/readdir.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/readdir.c b/fs/readdir.c
index 2f4c9c663a39..6469f076ba6e 100644
--- a/fs/readdir.c
+++ b/fs/readdir.c
@@ -61,6 +61,10 @@ int iterate_dir(struct file *file, struct dir_context *ctx)
 
 	res = -ENOENT;
 	if (!IS_DEADDIR(inode)) {
+		res = file_accessed(file, ctx->flags & DIR_CONTEXT_F_NOWAIT);
+		if (res == -EAGAIN)
+			goto out_unlock;
+
 		ctx->pos = file->f_pos;
 		if (shared)
 			res = file->f_op->iterate_shared(file, ctx);
@@ -68,8 +72,9 @@ int iterate_dir(struct file *file, struct dir_context *ctx)
 			res = file->f_op->iterate(file, ctx);
 		file->f_pos = ctx->pos;
 		fsnotify_access(file);
-		file_accessed(file, ctx->flags & DIR_CONTEXT_F_NOWAIT);
 	}
+
+out_unlock:
 	if (shared)
 		inode_unlock_shared(inode);
 	else
-- 
2.25.1