From patchwork Wed May 18 23:37:00 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Roesch X-Patchwork-Id: 12854293 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 BF048C43219 for ; Wed, 18 May 2022 23:38:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231573AbiERXiJ (ORCPT ); Wed, 18 May 2022 19:38:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53472 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231550AbiERXhr (ORCPT ); Wed, 18 May 2022 19:37:47 -0400 Received: from mx0a-00082601.pphosted.com (mx0a-00082601.pphosted.com [67.231.145.42]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 494F480236 for ; Wed, 18 May 2022 16:37:40 -0700 (PDT) Received: from pps.filterd (m0044012.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 24IN6GY7013654 for ; Wed, 18 May 2022 16:37:40 -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=YjR6bHdDemShrFnRSFoy0SU6vrzP5IeqvXhPCERFUGY=; b=Vj84wixRIzTnyHpWspgB0LqWOEa3kEBDkIN2GPDg1axkr+4mlCqzGxYxuTQekvkAuC7f uhj6Wa7ItvBct86J1Y/Lab7Iaeq+7Xy0LRtsNKQAXTKwr2aXETCmbbPAhubBEactY4Ke A0FmkwAv+xzeq45zTlaehPwhpn28aYQNIrY= Received: from maileast.thefacebook.com ([163.114.130.16]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3g4dea3tkx-2 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 18 May 2022 16:37:39 -0700 Received: from twshared8307.18.frc3.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:82::d) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.28; Wed, 18 May 2022 16:37:38 -0700 Received: by devvm225.atn0.facebook.com (Postfix, from userid 425415) id DD709F3ED863; Wed, 18 May 2022 16:37:12 -0700 (PDT) From: Stefan Roesch To: , , , , CC: , , Subject: [RFC PATCH v3 09/18] fs: Optimization for concurrent file time updates. Date: Wed, 18 May 2022 16:37:00 -0700 Message-ID: <20220518233709.1937634-10-shr@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220518233709.1937634-1-shr@fb.com> References: <20220518233709.1937634-1-shr@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-ORIG-GUID: Gk7U6rbLdfClBmNJ5zhjjsFfLJoAp-p9 X-Proofpoint-GUID: Gk7U6rbLdfClBmNJ5zhjjsFfLJoAp-p9 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.874,Hydra:6.0.486,FMLib:17.11.64.514 definitions=2022-05-18_06,2022-05-17_02,2022-02-23_01 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org This introduces the S_PENDING_TIME flag. If an async buffered write needs to update the time, it cannot be processed in the fast path of io-uring. When a time update is pending this flag is set for async buffered writes. Other concurrent async buffered writes for the same file do not need to wait while this time update is pending. This reduces the number of async buffered writes that need to get punted to the io-workers in io-uring. Signed-off-by: Stefan Roesch --- fs/inode.c | 11 +++++++++-- include/linux/fs.h | 3 +++ 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/fs/inode.c b/fs/inode.c index 3a5d0fa468ab..5c5021787780 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -2184,10 +2184,17 @@ int file_modified_async(struct file *file, int flags) ret = file_needs_update_time(inode, file, &now); if (ret <= 0) return ret; - if (flags & IOCB_NOWAIT) + if (flags & IOCB_NOWAIT) { + if (IS_PENDING_TIME(inode)) + return 0; + + inode->i_flags |= S_PENDING_TIME; return -EAGAIN; + } - return __file_update_time(inode, file, &now, ret); + ret = __file_update_time(inode, file, &now, ret); + inode->i_flags &= ~S_PENDING_TIME; + return ret; } EXPORT_SYMBOL(file_modified_async); diff --git a/include/linux/fs.h b/include/linux/fs.h index 9760283af7dc..5f3aaf61fb4b 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2141,6 +2141,8 @@ struct super_operations { #define S_CASEFOLD (1 << 15) /* Casefolded file */ #define S_VERITY (1 << 16) /* Verity file (using fs/verity/) */ #define S_KERNEL_FILE (1 << 17) /* File is in use by the kernel (eg. fs/cachefiles) */ +#define S_PENDING_TIME (1 << 18) /* File update time is pending */ + /* * Note that nosuid etc flags are inode-specific: setting some file-system @@ -2183,6 +2185,7 @@ static inline bool sb_rdonly(const struct super_block *sb) { return sb->s_flags #define IS_ENCRYPTED(inode) ((inode)->i_flags & S_ENCRYPTED) #define IS_CASEFOLDED(inode) ((inode)->i_flags & S_CASEFOLD) #define IS_VERITY(inode) ((inode)->i_flags & S_VERITY) +#define IS_PENDING_TIME(inode) ((inode)->i_flags & S_PENDING_TIME) #define IS_WHITEOUT(inode) (S_ISCHR(inode->i_mode) && \ (inode)->i_rdev == WHITEOUT_DEV)