From patchwork Wed Mar 16 13:17:09 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jingbo Xu X-Patchwork-Id: 12782663 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 E2881C43217 for ; Wed, 16 Mar 2022 13:17:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1356229AbiCPNTA (ORCPT ); Wed, 16 Mar 2022 09:19:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52678 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1356217AbiCPNSz (ORCPT ); Wed, 16 Mar 2022 09:18:55 -0400 Received: from out30-130.freemail.mail.aliyun.com (out30-130.freemail.mail.aliyun.com [115.124.30.130]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F3F2266AEF; Wed, 16 Mar 2022 06:17:39 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R411e4;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=16;SR=0;TI=SMTPD_---0V7Mu9.1_1647436655; Received: from localhost(mailfrom:jefflexu@linux.alibaba.com fp:SMTPD_---0V7Mu9.1_1647436655) by smtp.aliyun-inc.com(127.0.0.1); Wed, 16 Mar 2022 21:17:36 +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 Subject: [PATCH v5 08/22] erofs: use meta buffers for erofs_read_superblock() Date: Wed, 16 Mar 2022 21:17:09 +0800 Message-Id: <20220316131723.111553-9-jefflexu@linux.alibaba.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220316131723.111553-1-jefflexu@linux.alibaba.com> References: <20220316131723.111553-1-jefflexu@linux.alibaba.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org The only change is that, meta buffers read cache page without __GFP_FS flag, which shall not matter. Signed-off-by: Jeffle Xu Reviewed-by: Chao Yu --- fs/erofs/super.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) diff --git a/fs/erofs/super.c b/fs/erofs/super.c index 915eefe0d7e2..12755217631f 100644 --- a/fs/erofs/super.c +++ b/fs/erofs/super.c @@ -281,21 +281,19 @@ static int erofs_init_devices(struct super_block *sb, static int erofs_read_superblock(struct super_block *sb) { struct erofs_sb_info *sbi; - struct page *page; + struct erofs_buf buf = __EROFS_BUF_INITIALIZER; struct erofs_super_block *dsb; unsigned int blkszbits; void *data; int ret; - page = read_mapping_page(sb->s_bdev->bd_inode->i_mapping, 0, NULL); - if (IS_ERR(page)) { + data = erofs_read_metabuf(&buf, sb, 0, EROFS_KMAP); + if (IS_ERR(data)) { erofs_err(sb, "cannot read erofs superblock"); - return PTR_ERR(page); + return PTR_ERR(data); } sbi = EROFS_SB(sb); - - data = kmap(page); dsb = (struct erofs_super_block *)(data + EROFS_SUPER_OFFSET); ret = -EINVAL; @@ -365,8 +363,7 @@ static int erofs_read_superblock(struct super_block *sb) if (erofs_sb_has_ztailpacking(sbi)) erofs_info(sb, "EXPERIMENTAL compressed inline data feature in use. Use at your own risk!"); out: - kunmap(page); - put_page(page); + erofs_put_metabuf(&buf); return ret; }