linux-kernel - [PATCH v2 5/6] libfs: set FMODE

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Message-Id: <20230422-uring-getdents-v2-5-2db1e37dc55e@codewreck.org>
Date:   Wed, 10 May 2023 19:52:53 +0900
From:   Dominique Martinet <asmadeus@...ewreck.org>
To:     Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        Jens Axboe <axboe@...nel.dk>,
        Pavel Begunkov <asml.silence@...il.com>,
        Stefan Roesch <shr@...com>
Cc:     Clay Harris <bugs@...ycon.org>, Dave Chinner <david@...morbit.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        io-uring@...r.kernel.org,
        Dominique Martinet <asmadeus@...ewreck.org>
Subject: [PATCH v2 5/6] libfs: set FMODE_NOWAIT on dir open

the readdir can technically wait a bit on a spinlock, but that should
never wait for long enough to return EAGAIN -- just set the capability
flag on directories f_mode

Signed-off-by: Dominique Martinet <asmadeus@...ewreck.org>
---
 fs/libfs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/libfs.c b/fs/libfs.c
index 89cf614a3271..a3c7e42d90a7 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -81,6 +81,7 @@ EXPORT_SYMBOL(simple_lookup);
 int dcache_dir_open(struct inode *inode, struct file *file)
 {
 	file->private_data = d_alloc_cursor(file->f_path.dentry);
+	file->f_mode |= FMODE_NOWAIT;
 
 	return file->private_data ? 0 : -ENOMEM;
 }

-- 
2.39.2