From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id F2710C83F01 for ; Sun, 27 Aug 2023 13:32:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=hm9sAW2FL0jBTTbCfsvxaE8ubCrAQ6CXtq4uXKbj+L4=; b=kupkmmzMZuPULw Ihgmja8BQPafxvms4r9ZXTr8VmSihYINj6jKjhTJldvVaxJ6+keVySx20MswQhTyeyUlKvCYaHVzf OlFnDWVHGAoT4CgHiMu3fbaQP2yZ7ZkiyYVRXWskfqR2GeZliMaBco2xe+5z8jHzFQMmWflxMVhOa iyboeIa3ccfUEuqhsbqEAPchK+8IU9+gKsY1JRi0nBPPZXOR5f8eXTz5pyTwuH8Ji7ukcT5kmZeGE /81+q7wn4qREhgwon1IIwN8AJwTPHmRxpahveA0fpflCDA5YRrrnDMqlvltyjH2K0YPMBa2uwTN+X CqFfnqjZBWHRY3gwI9LA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qaFso-0085kf-2D; Sun, 27 Aug 2023 13:32:50 +0000 Received: from out-248.mta1.migadu.com ([2001:41d0:203:375::f8]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qaFsm-0085jY-1R for linux-mtd@lists.infradead.org; Sun, 27 Aug 2023 13:32:49 +0000 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> MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230827_063248_630358_60ACCA94 X-CRM114-Status: GOOD ( 10.81 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org 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 ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/