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 7ABB8C7EE23 for ; Wed, 31 May 2023 03:13:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234073AbjEaDNl (ORCPT ); Tue, 30 May 2023 23:13:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40118 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234048AbjEaDNh (ORCPT ); Tue, 30 May 2023 23:13:37 -0400 Received: from out30-110.freemail.mail.aliyun.com (out30-110.freemail.mail.aliyun.com [115.124.30.110]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4E39AE5 for ; Tue, 30 May 2023 20:13:35 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R511e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046059;MF=jefflexu@linux.alibaba.com;NM=1;PH=DS;RN=5;SR=0;TI=SMTPD_---0Vjvo1do_1685502811; Received: from localhost(mailfrom:jefflexu@linux.alibaba.com fp:SMTPD_---0Vjvo1do_1685502811) by smtp.aliyun-inc.com; Wed, 31 May 2023 11:13:32 +0800 From: Jingbo Xu To: xiang@kernel.org, chao@kernel.org, huyue2@coolpad.com, linux-erofs@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org Subject: [PATCH v4 1/5] erofs: enhance erofs_xattr_iter_fixup() helper Date: Wed, 31 May 2023 11:13:26 +0800 Message-Id: <20230531031330.3504-2-jefflexu@linux.alibaba.com> X-Mailer: git-send-email 2.19.1.6.gb485710b In-Reply-To: <20230531031330.3504-1-jefflexu@linux.alibaba.com> References: <20230531031330.3504-1-jefflexu@linux.alibaba.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Enhance erofs_xattr_iter_fixup() helper so that it could be reused in the situation where it.ofs could not span the block boundary. Besides call erofs_init_metabuf() and erofs_bread() separately to avoid the repetition of assigning buf->inode when iterating xattrs. Signed-off-by: Jingbo Xu --- fs/erofs/xattr.c | 82 +++++++++++++++++++++--------------------------- 1 file changed, 35 insertions(+), 47 deletions(-) diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c index bbfe7ce170d2..df6c4e6f1f4e 100644 --- a/fs/erofs/xattr.c +++ b/fs/erofs/xattr.c @@ -29,6 +29,24 @@ struct xattr_iter { unsigned int ofs; }; +static inline int erofs_xattr_iter_fixup(struct xattr_iter *it, bool nospan) +{ + if (it->ofs < it->sb->s_blocksize) + return 0; + + if (nospan && it->ofs != it->sb->s_blocksize) { + DBG_BUGON(1); + return -EFSCORRUPTED; + } + + it->blkaddr += erofs_blknr(it->sb, it->ofs); + it->kaddr = erofs_bread(&it->buf, it->blkaddr, EROFS_KMAP); + if (IS_ERR(it->kaddr)) + return PTR_ERR(it->kaddr); + it->ofs = erofs_blkoff(it->sb, it->ofs); + return 0; +} + static int erofs_init_inode_xattrs(struct inode *inode) { struct erofs_inode *const vi = EROFS_I(inode); @@ -80,6 +98,7 @@ static int erofs_init_inode_xattrs(struct inode *inode) goto out_unlock; } + it.sb = sb; it.buf = __EROFS_BUF_INITIALIZER; it.blkaddr = erofs_blknr(sb, erofs_iloc(inode) + vi->inode_isize); it.ofs = erofs_blkoff(sb, erofs_iloc(inode) + vi->inode_isize); @@ -105,19 +124,11 @@ static int erofs_init_inode_xattrs(struct inode *inode) it.ofs += sizeof(struct erofs_xattr_ibody_header); for (i = 0; i < vi->xattr_shared_count; ++i) { - if (it.ofs >= sb->s_blocksize) { - /* cannot be unaligned */ - DBG_BUGON(it.ofs != sb->s_blocksize); - - it.kaddr = erofs_read_metabuf(&it.buf, sb, ++it.blkaddr, - EROFS_KMAP); - if (IS_ERR(it.kaddr)) { - kfree(vi->xattr_shared_xattrs); - vi->xattr_shared_xattrs = NULL; - ret = PTR_ERR(it.kaddr); - goto out_unlock; - } - it.ofs = 0; + ret = erofs_xattr_iter_fixup(&it, true); + if (ret) { + kfree(vi->xattr_shared_xattrs); + vi->xattr_shared_xattrs = NULL; + goto out_unlock; } vi->xattr_shared_xattrs[i] = le32_to_cpu(*(__le32 *)(it.kaddr + it.ofs)); @@ -150,20 +161,6 @@ struct xattr_iter_handlers { unsigned int len); }; -static inline int xattr_iter_fixup(struct xattr_iter *it) -{ - if (it->ofs < it->sb->s_blocksize) - return 0; - - it->blkaddr += erofs_blknr(it->sb, it->ofs); - it->kaddr = erofs_read_metabuf(&it->buf, it->sb, it->blkaddr, - EROFS_KMAP); - if (IS_ERR(it->kaddr)) - return PTR_ERR(it->kaddr); - it->ofs = erofs_blkoff(it->sb, it->ofs); - return 0; -} - static int inline_xattr_iter_begin(struct xattr_iter *it, struct inode *inode) { @@ -201,7 +198,7 @@ static int xattr_foreach(struct xattr_iter *it, int err; /* 0. fixup blkaddr, ofs, ipage */ - err = xattr_iter_fixup(it); + err = erofs_xattr_iter_fixup(it, false); if (err) return err; @@ -236,14 +233,9 @@ static int xattr_foreach(struct xattr_iter *it, processed = 0; while (processed < entry.e_name_len) { - if (it->ofs >= it->sb->s_blocksize) { - DBG_BUGON(it->ofs > it->sb->s_blocksize); - - err = xattr_iter_fixup(it); - if (err) - goto out; - it->ofs = 0; - } + err = erofs_xattr_iter_fixup(it, true); + if (err) + goto out; slice = min_t(unsigned int, it->sb->s_blocksize - it->ofs, entry.e_name_len - processed); @@ -271,14 +263,9 @@ static int xattr_foreach(struct xattr_iter *it, } while (processed < value_sz) { - if (it->ofs >= it->sb->s_blocksize) { - DBG_BUGON(it->ofs > it->sb->s_blocksize); - - err = xattr_iter_fixup(it); - if (err) - goto out; - it->ofs = 0; - } + err = erofs_xattr_iter_fixup(it, true); + if (err) + goto out; slice = min_t(unsigned int, it->sb->s_blocksize - it->ofs, value_sz - processed); @@ -444,13 +431,14 @@ int erofs_getxattr(struct inode *inode, int index, if (it.name.len > EROFS_NAME_LEN) return -ERANGE; + it.it.sb = inode->i_sb; it.it.buf = __EROFS_BUF_INITIALIZER; + erofs_init_metabuf(&it.it.buf, it.it.sb); it.name.name = name; it.buffer = buffer; it.buffer_size = buffer_size; - it.it.sb = inode->i_sb; ret = inline_getxattr(inode, &it); if (ret == -ENOATTR) ret = shared_getxattr(inode, &it); @@ -632,14 +620,14 @@ ssize_t erofs_listxattr(struct dentry *dentry, if (ret) return ret; + it.it.sb = dentry->d_sb; it.it.buf = __EROFS_BUF_INITIALIZER; + erofs_init_metabuf(&it.it.buf, it.it.sb); it.dentry = dentry; it.buffer = buffer; it.buffer_size = buffer_size; it.buffer_ofs = 0; - it.it.sb = dentry->d_sb; - ret = inline_listxattr(&it); if (ret >= 0 || ret == -ENOATTR) ret = shared_listxattr(&it); -- 2.19.1.6.gb485710b