From patchwork Mon May 16 16:47:09 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Roesch X-Patchwork-Id: 12851166 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 88C44C4332F for ; Mon, 16 May 2022 16:49:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343941AbiEPQtC (ORCPT ); Mon, 16 May 2022 12:49:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37468 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343506AbiEPQs7 (ORCPT ); Mon, 16 May 2022 12:48:59 -0400 Received: from mx0a-00082601.pphosted.com (mx0b-00082601.pphosted.com [67.231.153.30]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B76AC3CA4E for ; Mon, 16 May 2022 09:48:48 -0700 (PDT) Received: from pps.filterd (m0089730.ppops.net [127.0.0.1]) by m0089730.ppops.net (8.17.1.5/8.17.1.5) with ESMTP id 24GFibhK016165 for ; Mon, 16 May 2022 09:48:47 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=facebook; bh=ytINONjGb5g4AiCRPvl5zx2CjqhigNhOPZAk5ycuIEA=; b=V888tU8+rnxpRIkcK3Cwp13O4l7V8oOfFVTGIoGFzwDAqgLEkkMXYnKKk/7g90kgrdsc ZH3Uro3vm96cMB2mrgi1alyLZJDeITvN2aESHDbuTNz68yp4+AHReFVru0mDC4gT9te2 sccT0oQAk5zlKD3c6Va6fp0KPzuMw3P+IQc= Received: from maileast.thefacebook.com ([163.114.130.16]) by m0089730.ppops.net (PPS) with ESMTPS id 3g27x9b0e9-2 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Mon, 16 May 2022 09:48:47 -0700 Received: from twshared10276.08.ash9.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:82::e) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Mon, 16 May 2022 09:48:46 -0700 Received: by devvm225.atn0.facebook.com (Postfix, from userid 425415) id 652D9F146DDD; Mon, 16 May 2022 09:48:25 -0700 (PDT) From: Stefan Roesch To: , , , , CC: , , Subject: [RFC PATCH v2 07/16] fs: split off need_file_update_time and do_file_update_time Date: Mon, 16 May 2022 09:47:09 -0700 Message-ID: <20220516164718.2419891-8-shr@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220516164718.2419891-1-shr@fb.com> References: <20220516164718.2419891-1-shr@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-GUID: 04LLA28-qNA2J95_4MJZRU_ilSmE98_h X-Proofpoint-ORIG-GUID: 04LLA28-qNA2J95_4MJZRU_ilSmE98_h X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.858,Hydra:6.0.486,FMLib:17.11.64.514 definitions=2022-05-16_15,2022-05-16_02,2022-02-23_01 Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org This splits off the functions need_file_update_time() and do_file_update_time() from the function file_update_time(). This is required to support async buffered writes. No intended functional changes in this patch. Signed-off-by: Stefan Roesch --- fs/inode.c | 71 ++++++++++++++++++++++++++++++++++++------------------ 1 file changed, 47 insertions(+), 24 deletions(-) diff --git a/fs/inode.c b/fs/inode.c index a6d70a1983f8..1d0b02763e98 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -2054,35 +2054,22 @@ int file_remove_privs(struct file *file) } EXPORT_SYMBOL(file_remove_privs); -/** - * file_update_time - update mtime and ctime time - * @file: file accessed - * - * Update the mtime and ctime members of an inode and mark the inode - * for writeback. Note that this function is meant exclusively for - * usage in the file write path of filesystems, and filesystems may - * choose to explicitly ignore update via this function with the - * S_NOCMTIME inode flag, e.g. for network filesystem where these - * timestamps are handled by the server. This can return an error for - * file systems who need to allocate space in order to update an inode. - */ - -int file_update_time(struct file *file) +static int need_file_update_time(struct inode *inode, struct file *file, + struct timespec64 *now) { - struct inode *inode = file_inode(file); - struct timespec64 now; int sync_it = 0; - int ret; + + if (unlikely(file->f_mode & FMODE_NOCMTIME)) + return 0; /* First try to exhaust all avenues to not sync */ if (IS_NOCMTIME(inode)) return 0; - now = current_time(inode); - if (!timespec64_equal(&inode->i_mtime, &now)) + if (!timespec64_equal(&inode->i_mtime, now)) sync_it = S_MTIME; - if (!timespec64_equal(&inode->i_ctime, &now)) + if (!timespec64_equal(&inode->i_ctime, now)) sync_it |= S_CTIME; if (IS_I_VERSION(inode) && inode_iversion_need_inc(inode)) @@ -2091,15 +2078,49 @@ int file_update_time(struct file *file) if (!sync_it) return 0; + return sync_it; +} + +static int do_file_update_time(struct inode *inode, struct file *file, + struct timespec64 *now, int sync_mode) +{ + int ret; + /* Finally allowed to write? Takes lock. */ if (__mnt_want_write_file(file)) return 0; - ret = inode_update_time(inode, &now, sync_it); + ret = inode_update_time(inode, now, sync_mode); __mnt_drop_write_file(file); return ret; } + +/** + * file_update_time - update mtime and ctime time + * @file: file accessed + * + * Update the mtime and ctime members of an inode and mark the inode + * for writeback. Note that this function is meant exclusively for + * usage in the file write path of filesystems, and filesystems may + * choose to explicitly ignore update via this function with the + * S_NOCMTIME inode flag, e.g. for network filesystem where these + * timestamps are handled by the server. This can return an error for + * file systems who need to allocate space in order to update an inode. + */ + +int file_update_time(struct file *file) +{ + int err; + struct inode *inode = file_inode(file); + struct timespec64 now = current_time(inode); + + err = need_file_update_time(inode, file, &now); + if (err < 0) + return err; + + return do_file_update_time(inode, file, &now, err); +} EXPORT_SYMBOL(file_update_time); /* Caller must hold the file's inode lock */ @@ -2108,6 +2129,7 @@ int file_modified(struct file *file) int ret; struct dentry *dentry = file_dentry(file); struct inode *inode = file_inode(file); + struct timespec64 now = current_time(inode); /* * Clear the security bits if the process is not being run by root. @@ -2122,10 +2144,11 @@ int file_modified(struct file *file) return ret; } - if (unlikely(file->f_mode & FMODE_NOCMTIME)) - return 0; + ret = need_file_update_time(inode, file, &now); + if (ret <= 0) + return ret; - return file_update_time(file); + return do_file_update_time(inode, file, &now, ret); } EXPORT_SYMBOL(file_modified);