From patchwork Thu Jun 16 21:22:16 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Roesch X-Patchwork-Id: 12884878 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 26C2CC43334 for ; Thu, 16 Jun 2022 21:33:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1379138AbiFPVd0 (ORCPT ); Thu, 16 Jun 2022 17:33:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53732 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1379143AbiFPVdZ (ORCPT ); Thu, 16 Jun 2022 17:33:25 -0400 Received: from mx0b-00082601.pphosted.com (mx0b-00082601.pphosted.com [67.231.153.30]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 566A14991B for ; Thu, 16 Jun 2022 14:33:24 -0700 (PDT) Received: from pps.filterd (m0109332.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 25GKPWTb032033 for ; Thu, 16 Jun 2022 14:33:23 -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=hg9mOHqe8lbN/Pa620EqWCYSM90BEn33RivumAhrzAE=; b=GWyZVaw3xkTWIdDstvRPeaNMsgXRLrr6bDzOW8PdCq+1iFfqL029ldH6mu+hFJEjJKwz GL2WTmUE/XPfJrMit0PUZI8ekIaVJEtlWzUm9cSZSFpQvRUU0ryT4N05QoC6+mI2drwP 5otmHRVP3fstAcl19jN+ipx2hzUV8l5Cpac= Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3gqxc5yk64-3 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Thu, 16 Jun 2022 14:33:23 -0700 Received: from twshared17349.03.ash7.facebook.com (2620:10d:c085:208::11) by mail.thefacebook.com (2620:10d:c085:21d::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.28; Thu, 16 Jun 2022 14:33:20 -0700 Received: by devvm225.atn0.facebook.com (Postfix, from userid 425415) id C98EA108B70AF; Thu, 16 Jun 2022 14:22:23 -0700 (PDT) From: Stefan Roesch To: , , , , CC: , , , , , , Christian Brauner Subject: [PATCH v9 09/14] fs: Split off inode_needs_update_time and __file_update_time Date: Thu, 16 Jun 2022 14:22:16 -0700 Message-ID: <20220616212221.2024518-10-shr@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220616212221.2024518-1-shr@fb.com> References: <20220616212221.2024518-1-shr@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-GUID: B5l15Qpfz8UZaAy1UZApsa3drbCGpAu4 X-Proofpoint-ORIG-GUID: B5l15Qpfz8UZaAy1UZApsa3drbCGpAu4 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.883,Hydra:6.0.517,FMLib:17.11.64.514 definitions=2022-06-16_18,2022-06-16_01,2022-02-23_01 Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org This splits off the functions inode_needs_update_time() and __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 Reviewed-by: Jan Kara Reviewed-by: Christian Brauner (Microsoft) --- fs/inode.c | 76 +++++++++++++++++++++++++++++++++++------------------- 1 file changed, 50 insertions(+), 26 deletions(-) diff --git a/fs/inode.c b/fs/inode.c index a2e18379c8a6..ff726d99ecc7 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -2049,35 +2049,18 @@ 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 inode_needs_update_time(struct inode *inode, struct timespec64 *now) { - struct inode *inode = file_inode(file); - struct timespec64 now; int sync_it = 0; - int ret; /* 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)) @@ -2086,15 +2069,50 @@ int file_update_time(struct file *file) if (!sync_it) return 0; - /* Finally allowed to write? Takes lock. */ - if (__mnt_want_write_file(file)) - return 0; + return sync_it; +} + +static int __file_update_time(struct file *file, struct timespec64 *now, + int sync_mode) +{ + int ret = 0; + struct inode *inode = file_inode(file); - ret = inode_update_time(inode, &now, sync_it); - __mnt_drop_write_file(file); + /* try to update time settings */ + if (!__mnt_want_write_file(file)) { + 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 updates via this function with the _NOCMTIME inode + * flag, e.g. for network filesystem where these imestamps are handled + * by the server. This can return an error for file systems who need to + * allocate space in order to update an inode. + * + * Return: 0 on success, negative errno on failure. + */ +int file_update_time(struct file *file) +{ + int ret; + struct inode *inode = file_inode(file); + struct timespec64 now = current_time(inode); + + ret = inode_needs_update_time(inode, &now); + if (ret <= 0) + return ret; + + return __file_update_time(file, &now, ret); +} EXPORT_SYMBOL(file_update_time); /** @@ -2111,6 +2129,8 @@ EXPORT_SYMBOL(file_update_time); int file_modified(struct file *file) { int ret; + 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. @@ -2123,7 +2143,11 @@ int file_modified(struct file *file) if (unlikely(file->f_mode & FMODE_NOCMTIME)) return 0; - return file_update_time(file); + ret = inode_needs_update_time(inode, &now); + if (ret <= 0) + return ret; + + return __file_update_time(file, &now, ret); } EXPORT_SYMBOL(file_modified);