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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 86F15C433F5 for ; Fri, 25 Mar 2022 12:23:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1359055AbiCYMZC (ORCPT ); Fri, 25 Mar 2022 08:25:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38456 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1359049AbiCYMYo (ORCPT ); Fri, 25 Mar 2022 08:24:44 -0400 Received: from out30-45.freemail.mail.aliyun.com (out30-45.freemail.mail.aliyun.com [115.124.30.45]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 20E29D5EB2; Fri, 25 Mar 2022 05:22:50 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R191e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04400;MF=jefflexu@linux.alibaba.com;NM=1;PH=DS;RN=18;SR=0;TI=SMTPD_---0V89Vk7G_1648210965; Received: from localhost(mailfrom:jefflexu@linux.alibaba.com fp:SMTPD_---0V89Vk7G_1648210965) by smtp.aliyun-inc.com(127.0.0.1); Fri, 25 Mar 2022 20:22:46 +0800 From: Jeffle Xu To: dhowells@redhat.com, linux-cachefs@redhat.com, xiang@kernel.org, chao@kernel.org, linux-erofs@lists.ozlabs.org Cc: torvalds@linux-foundation.org, gregkh@linuxfoundation.org, willy@infradead.org, linux-fsdevel@vger.kernel.org, joseph.qi@linux.alibaba.com, bo.liu@linux.alibaba.com, tao.peng@linux.alibaba.com, gerry@linux.alibaba.com, eguan@linux.alibaba.com, linux-kernel@vger.kernel.org, luodaowen.backend@bytedance.com, tianzichen@kuaishou.com, fannaihao@baidu.com Subject: [PATCH v6 14/22] erofs: add erofs_fscache_read_folios() helper Date: Fri, 25 Mar 2022 20:22:15 +0800 Message-Id: <20220325122223.102958-15-jefflexu@linux.alibaba.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220325122223.102958-1-jefflexu@linux.alibaba.com> References: <20220325122223.102958-1-jefflexu@linux.alibaba.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add erofs_fscache_read_folios() helper reading from fscache. It supports on-demand read semantics. That is, it will make the backend prepare for the data when cache miss. Once data ready, it will reinitiate a read from the cache. This helper can then be used to implement .readpage()/.readahead() of on-demand read semantics. Besides also add erofs_fscache_read_folio() wrapper helper. Signed-off-by: Jeffle Xu --- fs/erofs/fscache.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c index 30383d9adb62..6a55f7b5f883 100644 --- a/fs/erofs/fscache.c +++ b/fs/erofs/fscache.c @@ -7,6 +7,45 @@ static struct fscache_volume *volume; +/* + * erofs_fscache_read_folios - Read data from fscache. + * + * Fill the read data into page cache described by @start/len, which shall be + * both aligned with PAGE_SIZE. @pstart describes the corresponding physical + * start address in the cache file. + */ +static int erofs_fscache_read_folios(struct fscache_cookie *cookie, + struct address_space *mapping, + loff_t start, size_t len, + loff_t pstart) +{ + struct netfs_cache_resources cres; + struct iov_iter iter; + int ret; + + memset(&cres, 0, sizeof(cres)); + + ret = fscache_begin_read_operation(&cres, cookie); + if (ret) + return ret; + + iov_iter_xarray(&iter, READ, &mapping->i_pages, start, len); + + ret = fscache_read(&cres, pstart, &iter, + NETFS_READ_HOLE_ONDEMAND, NULL, NULL); + + fscache_end_operation(&cres); + return ret; +} + +static inline int erofs_fscache_read_folio(struct fscache_cookie *cookie, + struct folio *folio, loff_t pstart) +{ + return erofs_fscache_read_folios(cookie, folio_file_mapping(folio), + folio_pos(folio), folio_size(folio), + pstart); +} + static const struct address_space_operations erofs_fscache_blob_aops = { }; -- 2.27.0 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 lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (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 D8DC8C433EF for ; Fri, 25 Mar 2022 12:23:01 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4KQ1T0300Rz3bTB for ; Fri, 25 Mar 2022 23:23:00 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=linux.alibaba.com (client-ip=115.124.30.132; helo=out30-132.freemail.mail.aliyun.com; envelope-from=jefflexu@linux.alibaba.com; receiver=) Received: from out30-132.freemail.mail.aliyun.com (out30-132.freemail.mail.aliyun.com [115.124.30.132]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4KQ1Sv22bKz3081 for ; Fri, 25 Mar 2022 23:22:54 +1100 (AEDT) X-Alimail-AntiSpam: AC=PASS; BC=-1|-1; BR=01201311R191e4; CH=green; DM=||false|; DS=||; FP=0|-1|-1|-1|0|-1|-1|-1; HT=e01e04400; MF=jefflexu@linux.alibaba.com; NM=1; PH=DS; RN=18; SR=0; TI=SMTPD_---0V89Vk7G_1648210965; Received: from localhost(mailfrom:jefflexu@linux.alibaba.com fp:SMTPD_---0V89Vk7G_1648210965) by smtp.aliyun-inc.com(127.0.0.1); Fri, 25 Mar 2022 20:22:46 +0800 From: Jeffle Xu To: dhowells@redhat.com, linux-cachefs@redhat.com, xiang@kernel.org, chao@kernel.org, linux-erofs@lists.ozlabs.org Subject: [PATCH v6 14/22] erofs: add erofs_fscache_read_folios() helper Date: Fri, 25 Mar 2022 20:22:15 +0800 Message-Id: <20220325122223.102958-15-jefflexu@linux.alibaba.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220325122223.102958-1-jefflexu@linux.alibaba.com> References: <20220325122223.102958-1-jefflexu@linux.alibaba.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: linux-erofs@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Development of Linux EROFS file system List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: gregkh@linuxfoundation.org, fannaihao@baidu.com, willy@infradead.org, linux-kernel@vger.kernel.org, tianzichen@kuaishou.com, joseph.qi@linux.alibaba.com, linux-fsdevel@vger.kernel.org, luodaowen.backend@bytedance.com, gerry@linux.alibaba.com, torvalds@linux-foundation.org Errors-To: linux-erofs-bounces+linux-erofs=archiver.kernel.org@lists.ozlabs.org Sender: "Linux-erofs" Add erofs_fscache_read_folios() helper reading from fscache. It supports on-demand read semantics. That is, it will make the backend prepare for the data when cache miss. Once data ready, it will reinitiate a read from the cache. This helper can then be used to implement .readpage()/.readahead() of on-demand read semantics. Besides also add erofs_fscache_read_folio() wrapper helper. Signed-off-by: Jeffle Xu --- fs/erofs/fscache.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c index 30383d9adb62..6a55f7b5f883 100644 --- a/fs/erofs/fscache.c +++ b/fs/erofs/fscache.c @@ -7,6 +7,45 @@ static struct fscache_volume *volume; +/* + * erofs_fscache_read_folios - Read data from fscache. + * + * Fill the read data into page cache described by @start/len, which shall be + * both aligned with PAGE_SIZE. @pstart describes the corresponding physical + * start address in the cache file. + */ +static int erofs_fscache_read_folios(struct fscache_cookie *cookie, + struct address_space *mapping, + loff_t start, size_t len, + loff_t pstart) +{ + struct netfs_cache_resources cres; + struct iov_iter iter; + int ret; + + memset(&cres, 0, sizeof(cres)); + + ret = fscache_begin_read_operation(&cres, cookie); + if (ret) + return ret; + + iov_iter_xarray(&iter, READ, &mapping->i_pages, start, len); + + ret = fscache_read(&cres, pstart, &iter, + NETFS_READ_HOLE_ONDEMAND, NULL, NULL); + + fscache_end_operation(&cres); + return ret; +} + +static inline int erofs_fscache_read_folio(struct fscache_cookie *cookie, + struct folio *folio, loff_t pstart) +{ + return erofs_fscache_read_folios(cookie, folio_file_mapping(folio), + folio_pos(folio), folio_size(folio), + pstart); +} + static const struct address_space_operations erofs_fscache_blob_aops = { }; -- 2.27.0