From: Andreas Gruenbacher Subject: [PATCH v18 21/22] ext4: Add richacl support Date: Mon, 29 Feb 2016 09:17:26 +0100 Message-ID: <1456733847-17982-22-git-send-email-agruenba@redhat.com> References: <1456733847-17982-1-git-send-email-agruenba@redhat.com> Cc: "Aneesh Kumar K.V" , "J. Bruce Fields" , linux-nfs@vger.kernel.org, "Theodore Ts'o" , linux-cifs@vger.kernel.org, linux-api@vger.kernel.org, Trond Myklebust , linux-kernel@vger.kernel.org, xfs@oss.sgi.com, Christoph Hellwig , Andreas Dilger , linux-fsdevel@vger.kernel.org, Jeff Layton , linux-ext4@vger.kernel.org, Anna Schumaker To: Alexander Viro Return-path: In-Reply-To: <1456733847-17982-1-git-send-email-agruenba@redhat.com> Sender: linux-fsdevel-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org 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 | 12 ++++- fs/ext4/namei.c | 5 ++ fs/ext4/richacl.c | 142 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ fs/ext4/richacl.h | 40 +++++++++++++++ fs/ext4/xattr.c | 7 +++ 9 files changed, 229 insertions(+), 3 deletions(-) create mode 100644 fs/ext4/richacl.c create mode 100644 fs/ext4/richacl.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 474f1a4..30bfc50 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 @@ -764,6 +765,8 @@ 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 9cc57c3..ef6fb86 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -42,6 +42,7 @@ #include "xattr.h" #include "acl.h" #include "truncate.h" +#include "richacl.h" #include @@ -4851,6 +4852,14 @@ static void ext4_wait_for_tail_page_commit(struct inode *inode) } } +static inline int +ext4_acl_chmod(struct inode *inode, umode_t mode) +{ + if (IS_RICHACL(inode)) + return richacl_chmod(inode, inode->i_mode); + return posix_acl_chmod(inode, inode->i_mode); +} + /* * ext4_setattr() * @@ -5021,8 +5030,7 @@ 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 = ext4_acl_chmod(inode, inode->i_mode); 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..d581be4 --- /dev/null +++ b/fs/ext4/richacl.c @@ -0,0 +1,142 @@ +/* + * 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); + if (acl == ERR_PTR(-EINVAL)) + acl = ERR_PTR(-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(acl)) + return error; + if (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 }; -- 2.4.3