From patchwork Wed Jan 11 08:31:54 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jingbo Xu X-Patchwork-Id: 41818 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4e01:0:0:0:0:0 with SMTP id p1csp3199631wrt; Wed, 11 Jan 2023 00:37:42 -0800 (PST) X-Google-Smtp-Source: AMrXdXvz1OG6/MnERvyAk1CAAe1I9vD8rfeNmVeQKWwARqGskdjjrNuQ3FQZcHPukEun5AGfZ9hO X-Received: by 2002:a17:906:9f0a:b0:7ad:88f8:7663 with SMTP id fy10-20020a1709069f0a00b007ad88f87663mr81285879ejc.43.1673426262282; Wed, 11 Jan 2023 00:37:42 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673426262; cv=none; d=google.com; s=arc-20160816; b=MLCH1HhndLYoY/IsOu3Uv8n0wBmjQJ5b1lUTM7m37DqbOILAU46DhON/voIiuOiqye u4DTiTv0p1f0hZ2QvvmEeowE3N2rr5QxzM1iJrSVDEs5T2DhB+hz6+0f25/ARYpJ1WY4 KKQ/FjDr/DLF7ojm6G04AJvDDnyjLmIeRX7BXcF/LOlpdFVnA0K8lrZ90GzvadrXMkgs tanLk9oPQeaeKDPuAEp2BimpGugmu0L+XhqsMoV8Xs1j+9Fin+8oLTleg02fPTdq+lLU 3e/YW3PXKAoZu1VFqyXmDWSY5a7gJOuxG5hntaexYArJ1hXIM4CpPoskQajo4G9Cy0Fb x/dQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from; bh=6Br042J/5SLo0hEWwKmSDXl75HY8YEBMhqVusIiK4VY=; b=uS+DauCBXlx1Gpzi/3bvPOrCfzpE5bnQK98s0WICtjQJb0LwJvc1Z3SLu4F3yAiKcp 47l1A6nu99R0fIkmCRyd8aGPmrbkcc6OH0+Kby1mjXxWQomfC5GpMq7WD648jBH7gaDm N/qkJvpma+vjtztbEWTXurmS6g6l05CXGA4sCgwFt/hA2PZJabhSaR+nL3QP55NeAxSy uraL5ddWvImVobMNtip3I7KdR/CkfHWpnS4PlYRxhweTn+W0/T7M4TMiBmjtjvKOWRrq y+p4Re8bWZqO52j4fZEf27fKUNAF3omJfQSqmNC0DzX2guf3XlqT3nT9pmsox33J55tY ejBQ== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=alibaba.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id qf31-20020a1709077f1f00b00859fb13b1fdsi3926727ejc.736.2023.01.11.00.37.19; Wed, 11 Jan 2023 00:37:42 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=alibaba.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236083AbjAKIcY (ORCPT + 99 others); Wed, 11 Jan 2023 03:32:24 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48026 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235868AbjAKIcL (ORCPT ); Wed, 11 Jan 2023 03:32:11 -0500 Received: from out30-131.freemail.mail.aliyun.com (out30-131.freemail.mail.aliyun.com [115.124.30.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AE248A1A7; Wed, 11 Jan 2023 00:32:07 -0800 (PST) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R181e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018045168;MF=jefflexu@linux.alibaba.com;NM=1;PH=DS;RN=6;SR=0;TI=SMTPD_---0VZMQWl9_1673425921; Received: from localhost(mailfrom:jefflexu@linux.alibaba.com fp:SMTPD_---0VZMQWl9_1673425921) by smtp.aliyun-inc.com; Wed, 11 Jan 2023 16:32:02 +0800 From: Jingbo Xu To: xiang@kernel.org, chao@kernel.org, linux-erofs@lists.ozlabs.org Cc: huyue2@coolpad.com, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH v2 3/7] erofs: allocate anonymous file of blob for page cache sharing Date: Wed, 11 Jan 2023 16:31:54 +0800 Message-Id: <20230111083158.23462-4-jefflexu@linux.alibaba.com> X-Mailer: git-send-email 2.19.1.6.gb485710b In-Reply-To: <20230111083158.23462-1-jefflexu@linux.alibaba.com> References: <20230111083158.23462-1-jefflexu@linux.alibaba.com> MIME-Version: 1.0 X-Spam-Status: No, score=-9.9 required=5.0 tests=BAYES_00, ENV_AND_HDR_SPF_MATCH,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2, SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,USER_IN_DEF_SPF_WL autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754714616283544616?= X-GMAIL-MSGID: =?utf-8?q?1754714616283544616?= In prep for the following support for page cache sharing based mmap, allocate an anonymous file of corresponding blob, so that we can link associated vma to the blob later. Signed-off-by: Jingbo Xu --- fs/erofs/fscache.c | 74 +++++++++++++++++++++++++++++++++++++++++++++ fs/erofs/internal.h | 1 + 2 files changed, 75 insertions(+) diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c index 81f96c910277..f715b3efcc77 100644 --- a/fs/erofs/fscache.c +++ b/fs/erofs/fscache.c @@ -4,6 +4,8 @@ * Copyright (C) 2022, Bytedance Inc. All rights reserved. */ #include +#include +#include #include "internal.h" static DEFINE_MUTEX(erofs_domain_list_lock); @@ -22,6 +24,11 @@ struct erofs_fscache_request { refcount_t ref; }; +struct erofs_fscache_share_file_info { + erofs_off_t pa; + pgoff_t max_idx; +}; + static struct erofs_fscache_request *erofs_fscache_req_alloc(struct address_space *mapping, loff_t start, size_t len) { @@ -316,6 +323,73 @@ const struct address_space_operations erofs_fscache_access_aops = { .readahead = erofs_fscache_readahead, }; +static int erofs_fscache_share_meta_release(struct inode *inode, struct file *filp) +{ + kfree(filp->private_data); + filp->private_data = NULL; + return 0; +} + +static const struct file_operations erofs_fscache_share_meta_fops = { + .release = erofs_fscache_share_meta_release, +}; + +static int erofs_fscache_share_file_release(struct inode *inode, struct file *filp) +{ + fput(filp->private_data); + filp->private_data = NULL; + return 0; +} + +static int erofs_fscache_share_file_open(struct inode *inode, struct file *filp) +{ + /* since page cache sharing is enabled only when i_size <= chunk_size */ + struct erofs_map_blocks map = {}; /* .m_la = 0 */ + struct erofs_map_dev mdev; + struct inode *realinode; + struct file *realfile; + struct erofs_fscache_share_file_info *finfo; + int ret; + + ret = erofs_map_blocks(inode, &map, EROFS_GET_BLOCKS_RAW); + if (ret) + return ret; + + mdev = (struct erofs_map_dev) { + .m_deviceid = map.m_deviceid, + .m_pa = map.m_pa, + }; + ret = erofs_map_dev(inode->i_sb, &mdev); + if (ret) + return ret; + + finfo = kzalloc(sizeof(struct erofs_fscache_share_file_info), GFP_KERNEL); + if (!finfo) + return -ENOMEM; + finfo->pa = mdev.m_pa; + finfo->max_idx = DIV_ROUND_UP(mdev.m_pa + inode->i_size, PAGE_SIZE); + + realinode = mdev.m_fscache->inode; + ihold(realinode); + realfile = alloc_file_pseudo(realinode, filp->f_path.mnt, "[erofs]", + O_RDONLY, &erofs_fscache_share_meta_fops); + if (IS_ERR(realfile)) { + iput(realinode); + kfree(finfo); + return PTR_ERR(realfile); + } + + realfile->private_data = finfo; + filp->private_data = realfile; + return 0; +} + +const struct file_operations erofs_fscache_share_file_fops = { + .llseek = generic_file_llseek, + .open = erofs_fscache_share_file_open, + .release = erofs_fscache_share_file_release, +}; + static void erofs_fscache_domain_put(struct erofs_domain *domain) { mutex_lock(&erofs_domain_list_lock); diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h index b3d04bc2d279..7c6a7a2d9acf 100644 --- a/fs/erofs/internal.h +++ b/fs/erofs/internal.h @@ -616,6 +616,7 @@ struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb, void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache); extern const struct address_space_operations erofs_fscache_access_aops; +extern const struct file_operations erofs_fscache_share_file_fops; #else static inline int erofs_fscache_register_fs(struct super_block *sb) {