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 X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 09209C433E6 for ; Sat, 13 Mar 2021 04:41:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D049364F8E for ; Sat, 13 Mar 2021 04:41:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233188AbhCMEk7 (ORCPT ); Fri, 12 Mar 2021 23:40:59 -0500 Received: from zeniv-ca.linux.org.uk ([142.44.231.140]:33590 "EHLO zeniv-ca.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233134AbhCMEkg (ORCPT ); Fri, 12 Mar 2021 23:40:36 -0500 Received: from viro by zeniv-ca.linux.org.uk with local (Exim 4.94 #2 (Red Hat Linux)) id 1lKw2j-005O07-I9; Sat, 13 Mar 2021 04:38:25 +0000 From: Al Viro To: Linus Torvalds Cc: linux-fsdevel@vger.kernel.org, Jeff Layton , David Howells , Hans de Goede , Mike Marshall , Joseph Qi , Bob Peterson , Steve French , Richard Weinberger , Dominique Martinet , Arnd Bergmann Subject: [PATCH v2 11/15] cifs: have cifs_fattr_to_inode() refuse to change type on live inode Date: Sat, 13 Mar 2021 04:38:20 +0000 Message-Id: <20210313043824.1283821-11-viro@zeniv.linux.org.uk> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210313043824.1283821-1-viro@zeniv.linux.org.uk> References: <20210313043824.1283821-1-viro@zeniv.linux.org.uk> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: Al Viro Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org ... instead of trying to do that in the callers (and missing some, at that) Signed-off-by: Al Viro --- fs/cifs/cifsproto.h | 2 +- fs/cifs/file.c | 2 +- fs/cifs/inode.c | 42 +++++++++++++++--------------------------- fs/cifs/readdir.c | 4 +--- 4 files changed, 18 insertions(+), 32 deletions(-) diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h index 75ce6f742b8d..2a72dc24b00a 100644 --- a/fs/cifs/cifsproto.h +++ b/fs/cifs/cifsproto.h @@ -194,7 +194,7 @@ extern void cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb); extern void cifs_dir_info_to_fattr(struct cifs_fattr *, FILE_DIRECTORY_INFO *, struct cifs_sb_info *); -extern void cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr); +extern int cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr); extern struct inode *cifs_iget(struct super_block *sb, struct cifs_fattr *fattr); diff --git a/fs/cifs/file.c b/fs/cifs/file.c index 26de4329d161..78266f0e0595 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -165,7 +165,7 @@ int cifs_posix_open(char *full_path, struct inode **pinode, goto posix_open_ret; } } else { - cifs_fattr_to_inode(*pinode, &fattr); + rc = cifs_fattr_to_inode(*pinode, &fattr); } posix_open_ret: diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c index 80c487fcf10e..51cb1ca829ec 100644 --- a/fs/cifs/inode.c +++ b/fs/cifs/inode.c @@ -157,12 +157,18 @@ cifs_nlink_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr) } /* populate an inode with info from a cifs_fattr struct */ -void +int cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr) { struct cifsInodeInfo *cifs_i = CIFS_I(inode); struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); + if (!(inode->i_state & I_NEW) && + unlikely(inode_wrong_type(inode, fattr->cf_mode))) { + CIFS_I(inode)->time = 0; /* force reval */ + return -ESTALE; + } + cifs_revalidate_cache(inode, fattr); spin_lock(&inode->i_lock); @@ -219,6 +225,7 @@ cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr) inode->i_flags |= S_AUTOMOUNT; if (inode->i_state & I_NEW) cifs_set_ops(inode); + return 0; } void @@ -363,7 +370,7 @@ cifs_get_file_info_unix(struct file *filp) rc = 0; } - cifs_fattr_to_inode(inode, &fattr); + rc = cifs_fattr_to_inode(inode, &fattr); free_xid(xid); return rc; } @@ -426,13 +433,7 @@ int cifs_get_inode_info_unix(struct inode **pinode, } /* if filetype is different, return error */ - if (unlikely(inode_wrong_type(*pinode, fattr.cf_mode))) { - CIFS_I(*pinode)->time = 0; /* force reval */ - rc = -ESTALE; - goto cgiiu_exit; - } - - cifs_fattr_to_inode(*pinode, &fattr); + rc = cifs_fattr_to_inode(*pinode, &fattr); } cgiiu_exit: @@ -782,7 +783,8 @@ cifs_get_file_info(struct file *filp) */ fattr.cf_uniqueid = CIFS_I(inode)->uniqueid; fattr.cf_flags |= CIFS_FATTR_NEED_REVAL; - cifs_fattr_to_inode(inode, &fattr); + /* if filetype is different, return error */ + rc = cifs_fattr_to_inode(inode, &fattr); cgfi_exit: free_xid(xid); return rc; @@ -1099,16 +1101,8 @@ cifs_get_inode_info(struct inode **inode, rc = -ESTALE; goto out; } - /* if filetype is different, return error */ - if (unlikely(((*inode)->i_mode & S_IFMT) != - (fattr.cf_mode & S_IFMT))) { - CIFS_I(*inode)->time = 0; /* force reval */ - rc = -ESTALE; - goto out; - } - - cifs_fattr_to_inode(*inode, &fattr); + rc = cifs_fattr_to_inode(*inode, &fattr); } out: cifs_buf_release(smb1_backup_rsp_buf); @@ -1214,14 +1208,7 @@ smb311_posix_get_inode_info(struct inode **inode, } /* if filetype is different, return error */ - if (unlikely(((*inode)->i_mode & S_IFMT) != - (fattr.cf_mode & S_IFMT))) { - CIFS_I(*inode)->time = 0; /* force reval */ - rc = -ESTALE; - goto out; - } - - cifs_fattr_to_inode(*inode, &fattr); + rc = cifs_fattr_to_inode(*inode, &fattr); } out: cifs_put_tlink(tlink); @@ -1316,6 +1303,7 @@ cifs_iget(struct super_block *sb, struct cifs_fattr *fattr) } } + /* can't fail - see cifs_find_inode() */ cifs_fattr_to_inode(inode, fattr); if (sb->s_flags & SB_NOATIME) inode->i_flags |= S_NOATIME | S_NOCMTIME; diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c index 80bf4c6f4c7b..e563c0fb47cb 100644 --- a/fs/cifs/readdir.c +++ b/fs/cifs/readdir.c @@ -119,9 +119,7 @@ cifs_prime_dcache(struct dentry *parent, struct qstr *name, /* update inode in place * if both i_ino and i_mode didn't change */ if (CIFS_I(inode)->uniqueid == fattr->cf_uniqueid && - (inode->i_mode & S_IFMT) == - (fattr->cf_mode & S_IFMT)) { - cifs_fattr_to_inode(inode, fattr); + cifs_fattr_to_inode(inode, fattr) == 0) { dput(dentry); return; } -- 2.11.0