From patchwork Wed Jun 3 06:35:13 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhang Yi X-Patchwork-Id: 1302824 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-ext4-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=huawei.com Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 49cK124Cc4z9sTD for ; Wed, 3 Jun 2020 16:35:50 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726044AbgFCGft (ORCPT ); Wed, 3 Jun 2020 02:35:49 -0400 Received: from szxga04-in.huawei.com ([45.249.212.190]:5845 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725855AbgFCGft (ORCPT ); Wed, 3 Jun 2020 02:35:49 -0400 Received: from DGGEMS407-HUB.china.huawei.com (unknown [172.30.72.58]) by Forcepoint Email with ESMTP id 3A14D1A3D55755178FAE for ; Wed, 3 Jun 2020 14:35:47 +0800 (CST) Received: from huawei.com (10.175.104.175) by DGGEMS407-HUB.china.huawei.com (10.3.19.207) with Microsoft SMTP Server id 14.3.487.0; Wed, 3 Jun 2020 14:35:38 +0800 From: "zhangyi (F)" To: CC: , Subject: [PATCH v2 1/2] ext2: propagate errors up to ext2_find_entry()'s callers Date: Wed, 3 Jun 2020 14:35:13 +0800 Message-ID: <20200603063514.3904811-1-yi.zhang@huawei.com> X-Mailer: git-send-email 2.25.4 MIME-Version: 1.0 X-Originating-IP: [10.175.104.175] X-CFilter-Loop: Reflected Sender: linux-ext4-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org The same to commit <36de928641ee4> (ext4: propagate errors up to ext4_find_entry()'s callers') in ext4, also return error instead of NULL pointer in case of some error happens in ext2_find_entry() (e.g. -ENOMEM or -EIO). This could avoid a negative dentry cache entry installed even it failed to read directory block due to IO error. Signed-off-by: zhangyi (F) --- Changes since v1: - Remove ret parameter in ext2_find_entry(). fs/ext2/dir.c | 53 ++++++++++++++++++++++++------------------------- fs/ext2/ext2.h | 3 ++- fs/ext2/namei.c | 32 +++++++++++++++++++++++------ 3 files changed, 54 insertions(+), 34 deletions(-) diff --git a/fs/ext2/dir.c b/fs/ext2/dir.c index 13318e255ebf..95e4f0bd55a3 100644 --- a/fs/ext2/dir.c +++ b/fs/ext2/dir.c @@ -348,7 +348,6 @@ struct ext2_dir_entry_2 *ext2_find_entry (struct inode *dir, struct page *page = NULL; struct ext2_inode_info *ei = EXT2_I(dir); ext2_dirent * de; - int dir_has_error = 0; if (npages == 0) goto out; @@ -362,25 +361,25 @@ struct ext2_dir_entry_2 *ext2_find_entry (struct inode *dir, n = start; do { char *kaddr; - page = ext2_get_page(dir, n, dir_has_error); - if (!IS_ERR(page)) { - kaddr = page_address(page); - de = (ext2_dirent *) kaddr; - kaddr += ext2_last_byte(dir, n) - reclen; - while ((char *) de <= kaddr) { - if (de->rec_len == 0) { - ext2_error(dir->i_sb, __func__, - "zero-length directory entry"); - ext2_put_page(page); - goto out; - } - if (ext2_match (namelen, name, de)) - goto found; - de = ext2_next_entry(de); + page = ext2_get_page(dir, n, 0); + if (IS_ERR(page)) + return ERR_CAST(page); + + kaddr = page_address(page); + de = (ext2_dirent *) kaddr; + kaddr += ext2_last_byte(dir, n) - reclen; + while ((char *) de <= kaddr) { + if (de->rec_len == 0) { + ext2_error(dir->i_sb, __func__, + "zero-length directory entry"); + ext2_put_page(page); + goto out; } - ext2_put_page(page); - } else - dir_has_error = 1; + if (ext2_match(namelen, name, de)) + goto found; + de = ext2_next_entry(de); + } + ext2_put_page(page); if (++n >= npages) n = 0; @@ -414,18 +413,18 @@ struct ext2_dir_entry_2 * ext2_dotdot (struct inode *dir, struct page **p) return de; } -ino_t ext2_inode_by_name(struct inode *dir, const struct qstr *child) +int ext2_inode_by_name(struct inode *dir, const struct qstr *child, ino_t *ino) { - ino_t res = 0; struct ext2_dir_entry_2 *de; struct page *page; - de = ext2_find_entry (dir, child, &page); - if (de) { - res = le32_to_cpu(de->inode); - ext2_put_page(page); - } - return res; + de = ext2_find_entry(dir, child, &page); + if (IS_ERR_OR_NULL(de)) + return PTR_ERR(de); + + *ino = le32_to_cpu(de->inode); + ext2_put_page(page); + return 0; } static int ext2_prepare_chunk(struct page *page, loff_t pos, unsigned len) diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h index 8178bd38a9d6..a321ff9bf1b4 100644 --- a/fs/ext2/ext2.h +++ b/fs/ext2/ext2.h @@ -738,7 +738,8 @@ extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_wind /* dir.c */ extern int ext2_add_link (struct dentry *, struct inode *); -extern ino_t ext2_inode_by_name(struct inode *, const struct qstr *); +extern int ext2_inode_by_name(struct inode *dir, + const struct qstr *child, ino_t *ino); extern int ext2_make_empty(struct inode *, struct inode *); extern struct ext2_dir_entry_2 * ext2_find_entry (struct inode *,const struct qstr *, struct page **); extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *); diff --git a/fs/ext2/namei.c b/fs/ext2/namei.c index ccfbbf59e2fc..4b38e558d477 100644 --- a/fs/ext2/namei.c +++ b/fs/ext2/namei.c @@ -56,12 +56,15 @@ static inline int ext2_add_nondir(struct dentry *dentry, struct inode *inode) static struct dentry *ext2_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags) { struct inode * inode; - ino_t ino; + ino_t ino = 0; + int res; if (dentry->d_name.len > EXT2_NAME_LEN) return ERR_PTR(-ENAMETOOLONG); - ino = ext2_inode_by_name(dir, &dentry->d_name); + res = ext2_inode_by_name(dir, &dentry->d_name, &ino); + if (res) + return ERR_PTR(res); inode = NULL; if (ino) { inode = ext2_iget(dir->i_sb, ino); @@ -78,7 +81,12 @@ static struct dentry *ext2_lookup(struct inode * dir, struct dentry *dentry, uns struct dentry *ext2_get_parent(struct dentry *child) { struct qstr dotdot = QSTR_INIT("..", 2); - unsigned long ino = ext2_inode_by_name(d_inode(child), &dotdot); + ino_t ino = 0; + int res; + + res = ext2_inode_by_name(d_inode(child), &dotdot, &ino); + if (res) + return ERR_PTR(res); if (!ino) return ERR_PTR(-ENOENT); return d_obtain_alias(ext2_iget(child->d_sb, ino)); @@ -276,7 +284,11 @@ static int ext2_unlink(struct inode * dir, struct dentry *dentry) if (err) goto out; - de = ext2_find_entry (dir, &dentry->d_name, &page); + de = ext2_find_entry(dir, &dentry->d_name, &page); + if (IS_ERR(de)) { + err = PTR_ERR(de); + goto out; + } if (!de) { err = -ENOENT; goto out; @@ -332,7 +344,11 @@ static int ext2_rename (struct inode * old_dir, struct dentry * old_dentry, if (err) goto out; - old_de = ext2_find_entry (old_dir, &old_dentry->d_name, &old_page); + old_de = ext2_find_entry(old_dir, &old_dentry->d_name, &old_page); + if (IS_ERR(old_de)) { + err = PTR_ERR(old_de); + goto out; + } if (!old_de) { err = -ENOENT; goto out; @@ -354,7 +370,11 @@ static int ext2_rename (struct inode * old_dir, struct dentry * old_dentry, goto out_dir; err = -ENOENT; - new_de = ext2_find_entry (new_dir, &new_dentry->d_name, &new_page); + new_de = ext2_find_entry(new_dir, &new_dentry->d_name, &new_page); + if (IS_ERR(new_de)) { + err = PTR_ERR(new_de); + goto out_dir; + } if (!new_de) goto out_dir; ext2_set_link(new_dir, new_de, new_page, old_inode, 1); From patchwork Wed Jun 3 06:35:14 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhang Yi X-Patchwork-Id: 1302825 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-ext4-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=huawei.com Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 49cK133GYGz9sRK for ; Wed, 3 Jun 2020 16:35:51 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726046AbgFCGfu (ORCPT ); Wed, 3 Jun 2020 02:35:50 -0400 Received: from szxga04-in.huawei.com ([45.249.212.190]:5844 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725878AbgFCGft (ORCPT ); Wed, 3 Jun 2020 02:35:49 -0400 Received: from DGGEMS407-HUB.china.huawei.com (unknown [172.30.72.58]) by Forcepoint Email with ESMTP id 366ABF0B45F2359AEEDA for ; Wed, 3 Jun 2020 14:35:47 +0800 (CST) Received: from huawei.com (10.175.104.175) by DGGEMS407-HUB.china.huawei.com (10.3.19.207) with Microsoft SMTP Server id 14.3.487.0; Wed, 3 Jun 2020 14:35:38 +0800 From: "zhangyi (F)" To: CC: , Subject: [PATCH v2 2/2] ext2: ext2_find_entry() return -ENOENT if no entry found Date: Wed, 3 Jun 2020 14:35:14 +0800 Message-ID: <20200603063514.3904811-2-yi.zhang@huawei.com> X-Mailer: git-send-email 2.25.4 In-Reply-To: <20200603063514.3904811-1-yi.zhang@huawei.com> References: <20200603063514.3904811-1-yi.zhang@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.104.175] X-CFilter-Loop: Reflected Sender: linux-ext4-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org Almost all callers of ext2_find_entry() transform NULL return value to -ENOENT, so just let ext2_find_entry() retuen -ENOENT instead of NULL if no valid entry found, and also switch to check the return value of ext2_inode_by_name() in ext2_lookup() and ext2_get_parent(). Signed-off-by: zhangyi (F) Suggested-by: Jan Kara --- fs/ext2/dir.c | 11 ++++++++--- fs/ext2/namei.c | 27 ++++++++------------------- 2 files changed, 16 insertions(+), 22 deletions(-) diff --git a/fs/ext2/dir.c b/fs/ext2/dir.c index 95e4f0bd55a3..96c40fd7550e 100644 --- a/fs/ext2/dir.c +++ b/fs/ext2/dir.c @@ -393,7 +393,7 @@ struct ext2_dir_entry_2 *ext2_find_entry (struct inode *dir, } } while (n != start); out: - return NULL; + return ERR_PTR(-ENOENT); found: *res_page = page; @@ -419,11 +419,16 @@ int ext2_inode_by_name(struct inode *dir, const struct qstr *child, ino_t *ino) struct page *page; de = ext2_find_entry(dir, child, &page); - if (IS_ERR_OR_NULL(de)) + if (IS_ERR(de)) return PTR_ERR(de); - *ino = le32_to_cpu(de->inode); ext2_put_page(page); + if (!de->inode) { + ext2_error(dir->i_sb, __func__, "bad inode number: %u", + le32_to_cpu(de->inode)); + return -EFSCORRUPTED; + } + *ino = le32_to_cpu(de->inode); return 0; } diff --git a/fs/ext2/namei.c b/fs/ext2/namei.c index 4b38e558d477..9601d469c5b1 100644 --- a/fs/ext2/namei.c +++ b/fs/ext2/namei.c @@ -56,17 +56,18 @@ static inline int ext2_add_nondir(struct dentry *dentry, struct inode *inode) static struct dentry *ext2_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags) { struct inode * inode; - ino_t ino = 0; + ino_t ino; int res; if (dentry->d_name.len > EXT2_NAME_LEN) return ERR_PTR(-ENAMETOOLONG); res = ext2_inode_by_name(dir, &dentry->d_name, &ino); - if (res) - return ERR_PTR(res); - inode = NULL; - if (ino) { + if (res) { + if (res != -ENOENT) + return ERR_PTR(res); + inode = NULL; + } else { inode = ext2_iget(dir->i_sb, ino); if (inode == ERR_PTR(-ESTALE)) { ext2_error(dir->i_sb, __func__, @@ -81,14 +82,13 @@ static struct dentry *ext2_lookup(struct inode * dir, struct dentry *dentry, uns struct dentry *ext2_get_parent(struct dentry *child) { struct qstr dotdot = QSTR_INIT("..", 2); - ino_t ino = 0; + ino_t ino; int res; res = ext2_inode_by_name(d_inode(child), &dotdot, &ino); if (res) return ERR_PTR(res); - if (!ino) - return ERR_PTR(-ENOENT); + return d_obtain_alias(ext2_iget(child->d_sb, ino)); } @@ -289,10 +289,6 @@ static int ext2_unlink(struct inode * dir, struct dentry *dentry) err = PTR_ERR(de); goto out; } - if (!de) { - err = -ENOENT; - goto out; - } err = ext2_delete_entry (de, page); if (err) @@ -349,10 +345,6 @@ static int ext2_rename (struct inode * old_dir, struct dentry * old_dentry, err = PTR_ERR(old_de); goto out; } - if (!old_de) { - err = -ENOENT; - goto out; - } if (S_ISDIR(old_inode->i_mode)) { err = -EIO; @@ -369,14 +361,11 @@ static int ext2_rename (struct inode * old_dir, struct dentry * old_dentry, if (dir_de && !ext2_empty_dir (new_inode)) goto out_dir; - err = -ENOENT; new_de = ext2_find_entry(new_dir, &new_dentry->d_name, &new_page); if (IS_ERR(new_de)) { err = PTR_ERR(new_de); goto out_dir; } - if (!new_de) - goto out_dir; ext2_set_link(new_dir, new_de, new_page, old_inode, 1); new_inode->i_ctime = current_time(new_inode); if (dir_de)