From patchwork Wed Mar 16 22:19:02 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andreas Gruenbacher X-Patchwork-Id: 8605121 Return-Path: X-Original-To: patchwork-linux-nfs@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id E1907C0553 for ; Wed, 16 Mar 2016 22:21:26 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 87F7B2026F for ; Wed, 16 Mar 2016 22:21:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 04C44201C8 for ; Wed, 16 Mar 2016 22:21:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966315AbcCPWUu (ORCPT ); Wed, 16 Mar 2016 18:20:50 -0400 Received: from mx1.redhat.com ([209.132.183.28]:52546 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965630AbcCPWUp (ORCPT ); Wed, 16 Mar 2016 18:20:45 -0400 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) by mx1.redhat.com (Postfix) with ESMTPS id 8B8FB46213; Wed, 16 Mar 2016 22:20:44 +0000 (UTC) Received: from nux.redhat.com (vpn1-5-8.ams2.redhat.com [10.36.5.8]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u2GMJ4IJ007786; Wed, 16 Mar 2016 18:20:40 -0400 From: Andreas Gruenbacher To: Alexander Viro Cc: "Aneesh Kumar K.V" , Christoph Hellwig , "Theodore Ts'o" , Andreas Dilger , "J. Bruce Fields" , Jeff Layton , Trond Myklebust , Anna Schumaker , Dave Chinner , linux-ext4@vger.kernel.org, xfs@oss.sgi.com, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, linux-api@vger.kernel.org, Andreas Gruenbacher Subject: [PATCH v20 22/23] ext4: Add richacl support Date: Wed, 16 Mar 2016 23:19:02 +0100 Message-Id: <1458166743-18488-23-git-send-email-agruenba@redhat.com> In-Reply-To: <1458166743-18488-1-git-send-email-agruenba@redhat.com> References: <1458166743-18488-1-git-send-email-agruenba@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.23 Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: "Aneesh Kumar K.V" Support the richacl permission model in ext4. The richacls are stored in "system.richacl" xattrs. Richacls need to be enabled by tune2fs or at file system create time. Signed-off-by: Aneesh Kumar K.V Signed-off-by: Andreas Gruenbacher Reviewed-by: Andreas Dilger --- fs/ext4/Kconfig | 11 +++++ fs/ext4/Makefile | 1 + fs/ext4/file.c | 3 ++ fs/ext4/ialloc.c | 11 ++++- fs/ext4/inode.c | 5 +- fs/ext4/namei.c | 5 ++ fs/ext4/richacl.c | 137 ++++++++++++++++++++++++++++++++++++++++++++++++++++ fs/ext4/richacl.h | 40 +++++++++++++++ fs/ext4/xattr.c | 7 +++ include/linux/acl.h | 15 ++++++ 10 files changed, 231 insertions(+), 4 deletions(-) create mode 100644 fs/ext4/richacl.c create mode 100644 fs/ext4/richacl.h create mode 100644 include/linux/acl.h diff --git a/fs/ext4/Kconfig b/fs/ext4/Kconfig index b46e9fc..4e21c18 100644 --- a/fs/ext4/Kconfig +++ b/fs/ext4/Kconfig @@ -22,6 +22,17 @@ config EXT3_FS_POSIX_ACL This config option is here only for backward compatibility. ext3 filesystem is now handled by the ext4 driver. +config EXT4_FS_RICHACL + bool "Ext4 Rich Access Control Lists" + depends on EXT4_FS + select FS_RICHACL + help + Richacls are an implementation of NFSv4 ACLs, extended by file masks + to cleanly integrate into the POSIX file permission model. To learn + more about them, see http://www.bestbits.at/richacl/. + + If you don't know what Richacls are, say N. + config EXT3_FS_SECURITY bool "Ext3 Security Labels" depends on EXT3_FS diff --git a/fs/ext4/Makefile b/fs/ext4/Makefile index f52cf54..1fb7f11 100644 --- a/fs/ext4/Makefile +++ b/fs/ext4/Makefile @@ -14,3 +14,4 @@ ext4-$(CONFIG_EXT4_FS_POSIX_ACL) += acl.o ext4-$(CONFIG_EXT4_FS_SECURITY) += xattr_security.o ext4-$(CONFIG_EXT4_FS_ENCRYPTION) += crypto_policy.o crypto.o \ crypto_key.o crypto_fname.o +ext4-$(CONFIG_EXT4_FS_RICHACL) += richacl.o diff --git a/fs/ext4/file.c b/fs/ext4/file.c index 4cd318f..92e35bc 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -30,6 +30,7 @@ #include "ext4_jbd2.h" #include "xattr.h" #include "acl.h" +#include "richacl.h" /* * Called when an inode is released. Note that this is different @@ -749,6 +750,8 @@ const struct inode_operations ext4_file_inode_operations = { .removexattr = generic_removexattr, .get_acl = ext4_get_acl, .set_acl = ext4_set_acl, + .get_richacl = ext4_get_richacl, + .set_richacl = ext4_set_richacl, .fiemap = ext4_fiemap, }; diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c index acc0ad5..f2d31c2 100644 --- a/fs/ext4/ialloc.c +++ b/fs/ext4/ialloc.c @@ -27,6 +27,7 @@ #include "ext4_jbd2.h" #include "xattr.h" #include "acl.h" +#include "richacl.h" #include @@ -729,6 +730,14 @@ out: return ret; } +static inline int +ext4_new_acl(handle_t *handle, struct inode *inode, struct inode *dir) +{ + if (IS_RICHACL(dir)) + return ext4_init_richacl(handle, inode, dir); + return ext4_init_acl(handle, inode, dir); +} + /* * There are two policies for allocating an inode. If the new inode is * a directory, then a forward search is made for a block group with both @@ -1093,7 +1102,7 @@ got: if (err) goto fail_drop; - err = ext4_init_acl(handle, inode, dir); + err = ext4_new_acl(handle, inode, dir); if (err) goto fail_free_drop; diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index aee960b..1dbd4c2 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -37,10 +37,10 @@ #include #include #include +#include #include "ext4_jbd2.h" #include "xattr.h" -#include "acl.h" #include "truncate.h" #include @@ -5025,8 +5025,7 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr) ext4_orphan_del(NULL, inode); if (!rc && (ia_valid & ATTR_MODE)) - rc = posix_acl_chmod(inode, inode->i_mode); - + rc = acl_chmod(inode); err_out: ext4_std_error(inode->i_sb, error); if (!error) diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c index 48e4b89..d86c5f2 100644 --- a/fs/ext4/namei.c +++ b/fs/ext4/namei.c @@ -38,6 +38,7 @@ #include "xattr.h" #include "acl.h" +#include "richacl.h" #include /* @@ -3888,6 +3889,8 @@ const struct inode_operations ext4_dir_inode_operations = { .removexattr = generic_removexattr, .get_acl = ext4_get_acl, .set_acl = ext4_set_acl, + .get_richacl = ext4_get_richacl, + .set_richacl = ext4_set_richacl, .fiemap = ext4_fiemap, }; @@ -3899,4 +3902,6 @@ const struct inode_operations ext4_special_inode_operations = { .removexattr = generic_removexattr, .get_acl = ext4_get_acl, .set_acl = ext4_set_acl, + .get_richacl = ext4_get_richacl, + .set_richacl = ext4_set_richacl, }; diff --git a/fs/ext4/richacl.c b/fs/ext4/richacl.c new file mode 100644 index 0000000..13a88e2 --- /dev/null +++ b/fs/ext4/richacl.c @@ -0,0 +1,137 @@ +/* + * Copyright IBM Corporation, 2010 + * Copyright (C) 2015 Red Hat, Inc. + * Author: Aneesh Kumar K.V , + * Andreas Gruenbacher + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of version 2.1 of the GNU Lesser General Public License + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it would be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + * + */ + +#include +#include +#include + +#include "ext4.h" +#include "ext4_jbd2.h" +#include "xattr.h" +#include "acl.h" +#include "richacl.h" + +struct richacl * +ext4_get_richacl(struct inode *inode) +{ + const int name_index = EXT4_XATTR_INDEX_RICHACL; + void *value = NULL; + struct richacl *acl = NULL; + int retval; + + retval = ext4_xattr_get(inode, name_index, "", NULL, 0); + if (retval > 0) { + value = kmalloc(retval, GFP_NOFS); + if (!value) + return ERR_PTR(-ENOMEM); + retval = ext4_xattr_get(inode, name_index, "", value, retval); + } + if (retval > 0) + acl = richacl_from_xattr(&init_user_ns, value, retval, -EIO); + else if (retval != -ENODATA && retval != -ENOSYS) + acl = ERR_PTR(retval); + kfree(value); + + if (!IS_ERR(acl)) + set_cached_richacl(inode, acl); + + return acl; +} + +static int +__ext4_remove_richacl(handle_t *handle, struct inode *inode) +{ + const int name_index = EXT4_XATTR_INDEX_RICHACL; + int retval; + + retval = ext4_xattr_set_handle(handle, inode, name_index, "", + NULL, 0, 0); + if (!retval) + set_cached_richacl(inode, NULL); + return retval; +} + +static int +__ext4_set_richacl(handle_t *handle, struct inode *inode, struct richacl *acl) +{ + const int name_index = EXT4_XATTR_INDEX_RICHACL; + umode_t mode = inode->i_mode; + int retval, size; + void *value; + + if (richacl_equiv_mode(acl, &mode) == 0) { + inode->i_ctime = ext4_current_time(inode); + inode->i_mode = mode; + ext4_mark_inode_dirty(handle, inode); + return __ext4_remove_richacl(handle, inode); + } + + mode &= ~S_IRWXUGO; + mode |= richacl_masks_to_mode(acl); + + size = richacl_xattr_size(acl); + value = kmalloc(size, GFP_NOFS); + if (!value) + return -ENOMEM; + richacl_to_xattr(&init_user_ns, acl, value, size); + inode->i_mode = mode; + retval = ext4_xattr_set_handle(handle, inode, name_index, "", + value, size, 0); + kfree(value); + if (retval) + return retval; + + set_cached_richacl(inode, acl); + + return 0; +} + +int +ext4_set_richacl(struct inode *inode, struct richacl *acl) +{ + handle_t *handle; + int retval, retries = 0; + +retry: + handle = ext4_journal_start(inode, EXT4_HT_XATTR, + ext4_jbd2_credits_xattr(inode)); + if (IS_ERR(handle)) + return PTR_ERR(handle); + + if (acl) + retval = __ext4_set_richacl(handle, inode, acl); + else + retval = __ext4_remove_richacl(handle, inode); + + ext4_journal_stop(handle); + if (retval == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries)) + goto retry; + return retval; +} + +int +ext4_init_richacl(handle_t *handle, struct inode *inode, struct inode *dir) +{ + struct richacl *acl = richacl_create(&inode->i_mode, dir); + int error; + + error = PTR_ERR(acl); + if (!IS_ERR_OR_NULL(acl)) { + error = __ext4_set_richacl(handle, inode, acl); + richacl_put(acl); + } + return error; +} diff --git a/fs/ext4/richacl.h b/fs/ext4/richacl.h new file mode 100644 index 0000000..6fe9a92 --- /dev/null +++ b/fs/ext4/richacl.h @@ -0,0 +1,40 @@ +/* + * Copyright IBM Corporation, 2010 + * Copyright (C) 2015 Red Hat, Inc. + * Author Aneesh Kumar K.V + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of version 2.1 of the GNU Lesser General Public License + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it would be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + * + */ + +#ifndef __FS_EXT4_RICHACL_H +#define __FS_EXT4_RICHACL_H + +#include + +#ifdef CONFIG_EXT4_FS_RICHACL + +extern struct richacl *ext4_get_richacl(struct inode *); +extern int ext4_set_richacl(struct inode *, struct richacl *); + +extern int ext4_init_richacl(handle_t *, struct inode *, struct inode *); + +#else /* CONFIG_EXT4_FS_RICHACL */ + +#define ext4_get_richacl NULL +#define ext4_set_richacl NULL + +static inline int +ext4_init_richacl(handle_t *handle, struct inode *inode, struct inode *dir) +{ + return 0; +} + +#endif /* CONFIG_EXT4_FS_RICHACL */ +#endif /* __FS_EXT4_RICHACL_H */ diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c index a95151e..ef76630 100644 --- a/fs/ext4/xattr.c +++ b/fs/ext4/xattr.c @@ -55,6 +55,7 @@ #include #include #include +#include #include "ext4_jbd2.h" #include "ext4.h" #include "xattr.h" @@ -97,6 +98,9 @@ static const struct xattr_handler *ext4_xattr_handler_map[] = { #ifdef CONFIG_EXT4_FS_SECURITY [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler, #endif +#ifdef CONFIG_EXT4_FS_RICHACL + [EXT4_XATTR_INDEX_RICHACL] = &richacl_xattr_handler, +#endif }; const struct xattr_handler *ext4_xattr_handlers[] = { @@ -109,6 +113,9 @@ const struct xattr_handler *ext4_xattr_handlers[] = { #ifdef CONFIG_EXT4_FS_SECURITY &ext4_xattr_security_handler, #endif +#ifdef CONFIG_EXT4_FS_RICHACL + &richacl_xattr_handler, +#endif NULL }; diff --git a/include/linux/acl.h b/include/linux/acl.h new file mode 100644 index 0000000..3c3b5ce --- /dev/null +++ b/include/linux/acl.h @@ -0,0 +1,15 @@ +#ifndef __LINUX_ACL_H +#define __LINUX_ACL_H + +#include +#include + +static inline int +acl_chmod(struct inode *inode) +{ + if (IS_RICHACL(inode)) + return richacl_chmod(inode, inode->i_mode); + return posix_acl_chmod(inode, inode->i_mode); +} + +#endif