| 1 | /* |
| 2 | * Copyright (C) International Business Machines Corp., 2002-2004 |
| 3 | * Copyright (C) Andreas Gruenbacher, 2001 |
| 4 | * Copyright (C) Linus Torvalds, 1991, 1992 |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 14 | * the GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | */ |
| 20 | |
| 21 | #include <linux/sched.h> |
| 22 | #include <linux/slab.h> |
| 23 | #include <linux/fs.h> |
| 24 | #include <linux/posix_acl_xattr.h> |
| 25 | #include "jfs_incore.h" |
| 26 | #include "jfs_txnmgr.h" |
| 27 | #include "jfs_xattr.h" |
| 28 | #include "jfs_acl.h" |
| 29 | |
| 30 | struct posix_acl *jfs_get_acl(struct inode *inode, int type) |
| 31 | { |
| 32 | struct posix_acl *acl; |
| 33 | char *ea_name; |
| 34 | int size; |
| 35 | char *value = NULL; |
| 36 | |
| 37 | acl = get_cached_acl(inode, type); |
| 38 | if (acl != ACL_NOT_CACHED) |
| 39 | return acl; |
| 40 | |
| 41 | switch(type) { |
| 42 | case ACL_TYPE_ACCESS: |
| 43 | ea_name = POSIX_ACL_XATTR_ACCESS; |
| 44 | break; |
| 45 | case ACL_TYPE_DEFAULT: |
| 46 | ea_name = POSIX_ACL_XATTR_DEFAULT; |
| 47 | break; |
| 48 | default: |
| 49 | return ERR_PTR(-EINVAL); |
| 50 | } |
| 51 | |
| 52 | size = __jfs_getxattr(inode, ea_name, NULL, 0); |
| 53 | |
| 54 | if (size > 0) { |
| 55 | value = kmalloc(size, GFP_KERNEL); |
| 56 | if (!value) |
| 57 | return ERR_PTR(-ENOMEM); |
| 58 | size = __jfs_getxattr(inode, ea_name, value, size); |
| 59 | } |
| 60 | |
| 61 | if (size < 0) { |
| 62 | if (size == -ENODATA) |
| 63 | acl = NULL; |
| 64 | else |
| 65 | acl = ERR_PTR(size); |
| 66 | } else { |
| 67 | acl = posix_acl_from_xattr(&init_user_ns, value, size); |
| 68 | } |
| 69 | kfree(value); |
| 70 | if (!IS_ERR(acl)) |
| 71 | set_cached_acl(inode, type, acl); |
| 72 | return acl; |
| 73 | } |
| 74 | |
| 75 | static int jfs_set_acl(tid_t tid, struct inode *inode, int type, |
| 76 | struct posix_acl *acl) |
| 77 | { |
| 78 | char *ea_name; |
| 79 | int rc; |
| 80 | int size = 0; |
| 81 | char *value = NULL; |
| 82 | |
| 83 | if (S_ISLNK(inode->i_mode)) |
| 84 | return -EOPNOTSUPP; |
| 85 | |
| 86 | switch(type) { |
| 87 | case ACL_TYPE_ACCESS: |
| 88 | ea_name = POSIX_ACL_XATTR_ACCESS; |
| 89 | break; |
| 90 | case ACL_TYPE_DEFAULT: |
| 91 | ea_name = POSIX_ACL_XATTR_DEFAULT; |
| 92 | if (!S_ISDIR(inode->i_mode)) |
| 93 | return acl ? -EACCES : 0; |
| 94 | break; |
| 95 | default: |
| 96 | return -EINVAL; |
| 97 | } |
| 98 | if (acl) { |
| 99 | size = posix_acl_xattr_size(acl->a_count); |
| 100 | value = kmalloc(size, GFP_KERNEL); |
| 101 | if (!value) |
| 102 | return -ENOMEM; |
| 103 | rc = posix_acl_to_xattr(&init_user_ns, acl, value, size); |
| 104 | if (rc < 0) |
| 105 | goto out; |
| 106 | } |
| 107 | rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0); |
| 108 | out: |
| 109 | kfree(value); |
| 110 | |
| 111 | if (!rc) |
| 112 | set_cached_acl(inode, type, acl); |
| 113 | |
| 114 | return rc; |
| 115 | } |
| 116 | |
| 117 | int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir) |
| 118 | { |
| 119 | struct posix_acl *acl = NULL; |
| 120 | int rc = 0; |
| 121 | |
| 122 | if (S_ISLNK(inode->i_mode)) |
| 123 | return 0; |
| 124 | |
| 125 | acl = jfs_get_acl(dir, ACL_TYPE_DEFAULT); |
| 126 | if (IS_ERR(acl)) |
| 127 | return PTR_ERR(acl); |
| 128 | |
| 129 | if (acl) { |
| 130 | if (S_ISDIR(inode->i_mode)) { |
| 131 | rc = jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, acl); |
| 132 | if (rc) |
| 133 | goto cleanup; |
| 134 | } |
| 135 | rc = posix_acl_create(&acl, GFP_KERNEL, &inode->i_mode); |
| 136 | if (rc < 0) |
| 137 | goto cleanup; /* posix_acl_release(NULL) is no-op */ |
| 138 | if (rc > 0) |
| 139 | rc = jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, acl); |
| 140 | cleanup: |
| 141 | posix_acl_release(acl); |
| 142 | } else |
| 143 | inode->i_mode &= ~current_umask(); |
| 144 | |
| 145 | JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) | |
| 146 | inode->i_mode; |
| 147 | |
| 148 | return rc; |
| 149 | } |
| 150 | |
| 151 | int jfs_acl_chmod(struct inode *inode) |
| 152 | { |
| 153 | struct posix_acl *acl; |
| 154 | int rc; |
| 155 | tid_t tid; |
| 156 | |
| 157 | if (S_ISLNK(inode->i_mode)) |
| 158 | return -EOPNOTSUPP; |
| 159 | |
| 160 | acl = jfs_get_acl(inode, ACL_TYPE_ACCESS); |
| 161 | if (IS_ERR(acl) || !acl) |
| 162 | return PTR_ERR(acl); |
| 163 | |
| 164 | rc = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode); |
| 165 | if (rc) |
| 166 | return rc; |
| 167 | |
| 168 | tid = txBegin(inode->i_sb, 0); |
| 169 | mutex_lock(&JFS_IP(inode)->commit_mutex); |
| 170 | rc = jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, acl); |
| 171 | if (!rc) |
| 172 | rc = txCommit(tid, 1, &inode, 0); |
| 173 | txEnd(tid); |
| 174 | mutex_unlock(&JFS_IP(inode)->commit_mutex); |
| 175 | |
| 176 | posix_acl_release(acl); |
| 177 | return rc; |
| 178 | } |