From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 477FB8BF0 for ; Sun, 27 Aug 2023 13:32:55 +0000 (UTC) Received: from out-242.mta1.migadu.com (out-242.mta1.migadu.com [95.215.58.242]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 99B8C1AE for ; Sun, 27 Aug 2023 06:32:46 -0700 (PDT) X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1693143164; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=W04QOWrrBuMFm18D/+g+MI2uZNnKBIsbwxq2wO1dKKw=; b=Yw+5XvRr3vDIU02wPbTBy+P7Vb3r5vANDo9ahLXEToHmV4GE1+GjTI2/FiGvzS/72CcLGE wNMghjMXDTPCiQyUzrxQFpeftIBQyMH0jGDsayXuE4xMGusaZd0pBKhpckAeDFF1jY1yin IKCCEyk0xEU76DQXzGM7PUWjnMG6kt0= From: Hao Xu To: io-uring@vger.kernel.org, Jens Axboe Cc: Dominique Martinet , Pavel Begunkov , Christian Brauner , Alexander Viro , Stefan Roesch , Clay Harris , Dave Chinner , "Darrick J . Wong" , linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-ext4@vger.kernel.org, linux-cachefs@redhat.com, ecryptfs@vger.kernel.org, linux-nfs@vger.kernel.org, linux-unionfs@vger.kernel.org, bpf@vger.kernel.org, netdev@vger.kernel.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-btrfs@vger.kernel.org, codalist@coda.cs.cmu.edu, linux-f2fs-devel@lists.sourceforge.net, cluster-devel@redhat.com, linux-mm@kvack.org, linux-nilfs@vger.kernel.org, devel@lists.orangefs.org, linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, linux-mtd@lists.infradead.org, Wanpeng Li Subject: [PATCH 04/11] vfs: add a vfs helper for io_uring file pos lock Date: Sun, 27 Aug 2023 21:28:28 +0800 Message-Id: <20230827132835.1373581-5-hao.xu@linux.dev> In-Reply-To: <20230827132835.1373581-1-hao.xu@linux.dev> References: <20230827132835.1373581-1-hao.xu@linux.dev> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_BLOCKED, SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net From: Hao Xu Add a vfs helper file_pos_lock_nowait() for io_uring usage. The function have conditional nowait logic, i.e. if nowait is needed, return -EAGAIN when trylock fails. Signed-off-by: Hao Xu --- fs/file.c | 13 +++++++++++++ include/linux/file.h | 2 ++ 2 files changed, 15 insertions(+) diff --git a/fs/file.c b/fs/file.c index 35c62b54c9d6..8e5c38f5db52 100644 --- a/fs/file.c +++ b/fs/file.c @@ -1053,6 +1053,19 @@ void __f_unlock_pos(struct file *f) mutex_unlock(&f->f_pos_lock); } +int file_pos_lock_nowait(struct file *file, bool nowait) +{ + if (!(file->f_mode & FMODE_ATOMIC_POS)) + return 0; + + if (!nowait) + mutex_lock(&file->f_pos_lock); + else if (!mutex_trylock(&file->f_pos_lock)) + return -EAGAIN; + + return 1; +} + /* * We only lock f_pos if we have threads or if the file might be * shared with another process. In both cases we'll have an elevated diff --git a/include/linux/file.h b/include/linux/file.h index 6e9099d29343..bcc6ba0aec50 100644 --- a/include/linux/file.h +++ b/include/linux/file.h @@ -81,6 +81,8 @@ static inline void fdput_pos(struct fd f) fdput(f); } +extern int file_pos_lock_nowait(struct file *file, bool nowait); + DEFINE_CLASS(fd, struct fd, fdput(_T), fdget(fd), int fd) extern int f_dupfd(unsigned int from, struct file *file, unsigned flags); -- 2.25.1