From patchwork Fri Apr 15 12:36:11 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jingbo Xu X-Patchwork-Id: 12814876 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 6E287C433FE for ; Fri, 15 Apr 2022 12:37:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1353857AbiDOMkB (ORCPT ); Fri, 15 Apr 2022 08:40:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40434 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1353726AbiDOMja (ORCPT ); Fri, 15 Apr 2022 08:39:30 -0400 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 D4518C6EEE; Fri, 15 Apr 2022 05:36:49 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R131e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04426;MF=jefflexu@linux.alibaba.com;NM=1;PH=DS;RN=19;SR=0;TI=SMTPD_---0VA7Cc4d_1650026203; Received: from localhost(mailfrom:jefflexu@linux.alibaba.com fp:SMTPD_---0VA7Cc4d_1650026203) by smtp.aliyun-inc.com(127.0.0.1); Fri, 15 Apr 2022 20:36:44 +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, zhangjiachen.jaycee@bytedance.com Subject: [PATCH v9 18/21] erofs: implement fscache-based data read for non-inline layout Date: Fri, 15 Apr 2022 20:36:11 +0800 Message-Id: <20220415123614.54024-19-jefflexu@linux.alibaba.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220415123614.54024-1-jefflexu@linux.alibaba.com> References: <20220415123614.54024-1-jefflexu@linux.alibaba.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Implement the data plane of reading data from data blobs over fscache for non-inline layout. Signed-off-by: Jeffle Xu Reviewed-by: Gao Xiang --- fs/erofs/fscache.c | 51 +++++++++++++++++++++++++++++++++++++++++++++ fs/erofs/inode.c | 4 ++++ fs/erofs/internal.h | 2 ++ 3 files changed, 57 insertions(+) diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c index 3f00eb34ac35..b799b0fe1b67 100644 --- a/fs/erofs/fscache.c +++ b/fs/erofs/fscache.c @@ -84,10 +84,61 @@ static int erofs_fscache_meta_readpage(struct file *data, struct page *page) return ret; } +static int erofs_fscache_readpage(struct file *file, struct page *page) +{ + struct folio *folio = page_folio(page); + struct inode *inode = folio_mapping(folio)->host; + struct super_block *sb = inode->i_sb; + struct erofs_map_blocks map; + struct erofs_map_dev mdev; + erofs_off_t pos; + loff_t pstart; + int ret = 0; + + DBG_BUGON(folio_size(folio) != EROFS_BLKSIZ); + + pos = folio_pos(folio); + map.m_la = pos; + + ret = erofs_map_blocks(inode, &map, EROFS_GET_BLOCKS_RAW); + if (ret) + goto out_unlock; + + if (!(map.m_flags & EROFS_MAP_MAPPED)) { + folio_zero_range(folio, 0, folio_size(folio)); + goto out_uptodate; + } + + mdev = (struct erofs_map_dev) { + .m_deviceid = map.m_deviceid, + .m_pa = map.m_pa, + }; + + ret = erofs_map_dev(sb, &mdev); + if (ret) + goto out_unlock; + + pstart = mdev.m_pa + (pos - map.m_la); + ret = erofs_fscache_read_folios(mdev.m_fscache->cookie, + folio_mapping(folio), folio_pos(folio), + folio_size(folio), pstart); + +out_uptodate: + if (!ret) + folio_mark_uptodate(folio); +out_unlock: + folio_unlock(folio); + return ret; +} + static const struct address_space_operations erofs_fscache_meta_aops = { .readpage = erofs_fscache_meta_readpage, }; +const struct address_space_operations erofs_fscache_access_aops = { + .readpage = erofs_fscache_readpage, +}; + /* * Create an fscache context for data blob. * Return: 0 on success and allocated fscache context is assigned to @fscache, diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c index e8b37ba5e9ad..8d3f56c6469b 100644 --- a/fs/erofs/inode.c +++ b/fs/erofs/inode.c @@ -297,6 +297,10 @@ static int erofs_fill_inode(struct inode *inode, int isdir) goto out_unlock; } inode->i_mapping->a_ops = &erofs_raw_access_aops; +#ifdef CONFIG_EROFS_FS_ONDEMAND + if (erofs_is_fscache_mode(inode->i_sb)) + inode->i_mapping->a_ops = &erofs_fscache_access_aops; +#endif out_unlock: erofs_put_metabuf(&buf); diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h index fa488af8dfcf..c8f6ac910976 100644 --- a/fs/erofs/internal.h +++ b/fs/erofs/internal.h @@ -639,6 +639,8 @@ int erofs_fscache_register_cookie(struct super_block *sb, struct erofs_fscache **fscache, char *name, bool need_inode); void erofs_fscache_unregister_cookie(struct erofs_fscache **fscache); + +extern const struct address_space_operations erofs_fscache_access_aops; #else static inline int erofs_fscache_register_fs(struct super_block *sb) {