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 13BD3C433FE for ; Wed, 9 Feb 2022 06:01:54 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4Jtq5X2wNWz3cCg for ; Wed, 9 Feb 2022 17:01:52 +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 4Jtq5K0pXRz3cBq for ; Wed, 9 Feb 2022 17:01:40 +1100 (AEDT) X-Alimail-AntiSpam: AC=PASS; BC=-1|-1; BR=01201311R151e4; CH=green; DM=||false|; DS=||; FP=0|-1|-1|-1|0|-1|-1|-1; HT=e01e04423; MF=jefflexu@linux.alibaba.com; NM=1; PH=DS; RN=15; SR=0; TI=SMTPD_---0V3zaQUB_1644386489; Received: from localhost(mailfrom:jefflexu@linux.alibaba.com fp:SMTPD_---0V3zaQUB_1644386489) by smtp.aliyun-inc.com(127.0.0.1); Wed, 09 Feb 2022 14:01:30 +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 v3 16/22] erofs: implement fscache-based data read for inline layout Date: Wed, 9 Feb 2022 14:01:02 +0800 Message-Id: <20220209060108.43051-17-jefflexu@linux.alibaba.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220209060108.43051-1-jefflexu@linux.alibaba.com> References: <20220209060108.43051-1-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, willy@infradead.org, linux-kernel@vger.kernel.org, joseph.qi@linux.alibaba.com, linux-fsdevel@vger.kernel.org, gerry@linux.alibaba.com, torvalds@linux-foundation.org Errors-To: linux-erofs-bounces+linux-erofs=archiver.kernel.org@lists.ozlabs.org Sender: "Linux-erofs" This patch implements the data plane of reading data from bootstrap blob file over fscache for inline layout. Signed-off-by: Jeffle Xu --- fs/erofs/fscache.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c index 82fdde054b0b..fcd686f4dc9f 100644 --- a/fs/erofs/fscache.c +++ b/fs/erofs/fscache.c @@ -95,6 +95,41 @@ static int erofs_fscache_readpage_noinline(struct page *page, return erofs_fscache_read_page(cookie, page, start); } +static int erofs_fscache_readpage_inline(struct page *page, + struct erofs_fscache_map *fsmap) +{ + struct inode *inode = page->mapping->host; + struct super_block *sb = inode->i_sb; + struct erofs_buf buf = __EROFS_BUF_INITIALIZER; + erofs_blk_t blknr; + size_t offset, len; + void *src, *dst; + + /* + * For inline (tail packing) layout, the offset may be non-zero, while + * the offset can be calculated from corresponding physical address + * directly. + * Currently only flat layout supports inline (FLAT_INLINE), and the + * output map.m_pa is exactly the physical address of o_la in this case. + */ + offset = erofs_blkoff(fsmap->m_pa); + blknr = erofs_blknr(fsmap->m_pa); + len = fsmap->m_llen; + + src = erofs_read_metabuf(&buf, sb, blknr, EROFS_KMAP); + if (IS_ERR(src)) + return PTR_ERR(src); + + dst = kmap(page); + memcpy(dst, src + offset, len); + memset(dst + len, 0, PAGE_SIZE - len); + kunmap(page); + + erofs_put_metabuf(&buf); + + return 0; +} + static int erofs_fscache_do_readpage(struct page *page) { struct inode *inode = page->mapping->host; @@ -128,6 +163,8 @@ static int erofs_fscache_do_readpage(struct page *page) case EROFS_INODE_FLAT_PLAIN: case EROFS_INODE_CHUNK_BASED: return erofs_fscache_readpage_noinline(page, &fsmap); + case EROFS_INODE_FLAT_INLINE: + return erofs_fscache_readpage_inline(page, &fsmap); default: DBG_BUGON(1); return -EOPNOTSUPP; -- 2.27.0