Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261429AbVB0QSq (ORCPT ); Sun, 27 Feb 2005 11:18:46 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261439AbVB0QSo (ORCPT ); Sun, 27 Feb 2005 11:18:44 -0500 Received: from ns.suse.de ([195.135.220.2]:30676 "EHLO Cantor.suse.de") by vger.kernel.org with ESMTP id S261429AbVB0P45 (ORCPT ); Sun, 27 Feb 2005 10:56:57 -0500 Message-Id: <20050227152355.081130000@blunzn.suse.de> References: <20050227152243.083308000@blunzn.suse.de> Date: Sun, 27 Feb 2005 16:22:58 +0100 From: Andreas Gruenbacher To: linux-kernel@vger.kernel.org, Neil Brown , Trond Myklebust Cc: Olaf Kirch , "Andries E. Brouwer" , Andrew Morton Subject: [patch 15/16] ACL umask handling workaround in nfs client Content-Disposition: inline; filename=nfsacl-acl-umask-handling-workaround-in-nfs-client-2.patch Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4932 Lines: 168 NFSv3 has no concept of a umask on the server side: The client applies the umask locally, and sends the effective permissions to the server. This behavior is wrong when files are created in a directory that has a default ACL. In this case, the umask is supposed to be ignored, and only the default ACL determines the file's effective permissions. Usually its the server's task to conditionally apply the umask. But since the server knows nothing about the umask, we have to do it on the client side. This patch tries to fetch the parent directory's default ACL before creating a new file, computes the appropriate create mode to send to the server, and finally sets the new file's access and default acl appropriately. Many thanks to Buck Huppmann for sending the initial version of this patch, as well as for arguing why we need this change. Signed-off-by: Andreas Gruenbacher Acked-by: Olaf Kirch Index: linux-2.6.11-rc5/fs/nfs/nfs3proc.c =================================================================== --- linux-2.6.11-rc5.orig/fs/nfs/nfs3proc.c +++ linux-2.6.11-rc5/fs/nfs/nfs3proc.c @@ -292,6 +292,38 @@ static int nfs3_proc_commit(struct nfs_w return status; } +static int nfs3_set_default_acl(struct inode *dir, struct inode *inode, + mode_t mode) +{ +#ifdef CONFIG_NFS_ACL + struct posix_acl *dfacl, *acl; + int error = 0; + + dfacl = NFS_PROTO(dir)->getacl(dir, ACL_TYPE_DEFAULT); + if (IS_ERR(dfacl)) { + error = PTR_ERR(dfacl); + return (error == -EOPNOTSUPP) ? 0 : error; + } + if (!dfacl) + return 0; + acl = posix_acl_clone(dfacl, GFP_KERNEL); + error = -ENOMEM; + if (!acl) + goto out; + error = posix_acl_create_masq(acl, &mode); + if (error < 0) + goto out; + error = NFS_PROTO(inode)->setacls(inode, acl, S_ISDIR(inode->i_mode) ? + dfacl : NULL); +out: + posix_acl_release(acl); + posix_acl_release(dfacl); + return error; +#else + return 0; +#endif +} + /* * Create a regular file. * For now, we don't implement O_EXCL. @@ -314,8 +346,12 @@ nfs3_proc_create(struct inode *dir, stru .fh = &fhandle, .fattr = &fattr }; + mode_t mode; int status; + mode = sattr->ia_mode; + sattr->ia_mode &= ~current->fs->umask; + dprintk("NFS call create %s\n", name->name); arg.createmode = NFS3_CREATE_UNCHECKED; if (flags & O_EXCL) { @@ -350,7 +386,6 @@ again: exit: dprintk("NFS reply create: %d\n", status); - if (status != 0) goto out; if (fhandle.size == 0 || !(fattr.valid & NFS_ATTR_FATTR)) { @@ -384,9 +419,10 @@ exit: if (status == 0) { struct inode *inode; inode = nfs_fhget(dir->i_sb, &fhandle, &fattr); - if (inode) - return inode; status = -ENOMEM; + if (!inode) + goto out; + status = nfs3_set_default_acl(dir, inode, mode); } out: return ERR_PTR(status); @@ -556,8 +592,12 @@ nfs3_proc_mkdir(struct inode *dir, struc .fh = &fh, .fattr = &fattr }; + mode_t mode; int status; + mode = sattr->ia_mode; + sattr->ia_mode &= ~current->fs->umask; + dprintk("NFS call mkdir %s\n", dentry->d_name.name); dir_attr.valid = 0; fattr.valid = 0; @@ -566,6 +606,8 @@ nfs3_proc_mkdir(struct inode *dir, struc if (!status) status = nfs_instantiate(dentry, &fh, &fattr); dprintk("NFS reply mkdir: %d\n", status); + if (!status) + status = nfs3_set_default_acl(dir, dentry->d_inode, mode); return status; } @@ -659,6 +701,7 @@ nfs3_proc_mknod(struct inode *dir, struc .fh = &fh, .fattr = &fattr }; + mode_t mode; int status; switch (sattr->ia_mode & S_IFMT) { @@ -669,6 +712,9 @@ nfs3_proc_mknod(struct inode *dir, struc default: return -EINVAL; } + mode = sattr->ia_mode; + sattr->ia_mode &= ~current->fs->umask; + dprintk("NFS call mknod %s %u:%u\n", dentry->d_name.name, MAJOR(rdev), MINOR(rdev)); dir_attr.valid = 0; @@ -678,6 +724,8 @@ nfs3_proc_mknod(struct inode *dir, struc if (!status) status = nfs_instantiate(dentry, &fh, &fattr); dprintk("NFS reply mknod: %d\n", status); + if (!status) + status = nfs3_set_default_acl(dir, dentry->d_inode, mode); return status; } Index: linux-2.6.11-rc5/fs/nfs/inode.c =================================================================== --- linux-2.6.11-rc5.orig/fs/nfs/inode.c +++ linux-2.6.11-rc5/fs/nfs/inode.c @@ -485,6 +485,8 @@ nfs_fill_super(struct super_block *sb, s server->client_acl = clnt; /* Initially assume the nfsacl program is supported */ server->flags |= NFSACL; + /* The nfs client applies the umask itself when needed. */ + sb->s_flags |= MS_POSIXACL; } #endif if (server->flags & NFS_MOUNT_VER3) { -- Andreas Gruenbacher SUSE Labs, SUSE LINUX PRODUCTS GMBH - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/