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/fs.h> 23 #include <linux/quotaops.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 static 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(value, size); 68 } 69 kfree(value); 70 if (!IS_ERR(acl)) { 71 set_cached_acl(inode, type, acl); 72 posix_acl_release(acl); 73 } 74 return acl; 75 } 76 77 static int jfs_set_acl(tid_t tid, struct inode *inode, int type, 78 struct posix_acl *acl) 79 { 80 char *ea_name; 81 int rc; 82 int size = 0; 83 char *value = NULL; 84 85 if (S_ISLNK(inode->i_mode)) 86 return -EOPNOTSUPP; 87 88 switch(type) { 89 case ACL_TYPE_ACCESS: 90 ea_name = POSIX_ACL_XATTR_ACCESS; 91 break; 92 case ACL_TYPE_DEFAULT: 93 ea_name = POSIX_ACL_XATTR_DEFAULT; 94 if (!S_ISDIR(inode->i_mode)) 95 return acl ? -EACCES : 0; 96 break; 97 default: 98 return -EINVAL; 99 } 100 if (acl) { 101 size = posix_acl_xattr_size(acl->a_count); 102 value = kmalloc(size, GFP_KERNEL); 103 if (!value) 104 return -ENOMEM; 105 rc = posix_acl_to_xattr(acl, value, size); 106 if (rc < 0) 107 goto out; 108 } 109 rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0); 110 out: 111 kfree(value); 112 113 if (!rc) 114 set_cached_acl(inode, type, acl); 115 116 return rc; 117 } 118 119 static int jfs_check_acl(struct inode *inode, int mask) 120 { 121 struct posix_acl *acl = jfs_get_acl(inode, ACL_TYPE_ACCESS); 122 123 if (IS_ERR(acl)) 124 return PTR_ERR(acl); 125 if (acl) { 126 int error = posix_acl_permission(inode, acl, mask); 127 posix_acl_release(acl); 128 return error; 129 } 130 131 return -EAGAIN; 132 } 133 134 int jfs_permission(struct inode *inode, int mask) 135 { 136 return generic_permission(inode, mask, jfs_check_acl); 137 } 138 139 int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir) 140 { 141 struct posix_acl *acl = NULL; 142 struct posix_acl *clone; 143 mode_t mode; 144 int rc = 0; 145 146 if (S_ISLNK(inode->i_mode)) 147 return 0; 148 149 acl = jfs_get_acl(dir, ACL_TYPE_DEFAULT); 150 if (IS_ERR(acl)) 151 return PTR_ERR(acl); 152 153 if (acl) { 154 if (S_ISDIR(inode->i_mode)) { 155 rc = jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, acl); 156 if (rc) 157 goto cleanup; 158 } 159 clone = posix_acl_clone(acl, GFP_KERNEL); 160 if (!clone) { 161 rc = -ENOMEM; 162 goto cleanup; 163 } 164 mode = inode->i_mode; 165 rc = posix_acl_create_masq(clone, &mode); 166 if (rc >= 0) { 167 inode->i_mode = mode; 168 if (rc > 0) 169 rc = jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, 170 clone); 171 } 172 posix_acl_release(clone); 173 cleanup: 174 posix_acl_release(acl); 175 } else 176 inode->i_mode &= ~current_umask(); 177 178 JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) | 179 inode->i_mode; 180 181 return rc; 182 } 183 184 static int jfs_acl_chmod(struct inode *inode) 185 { 186 struct posix_acl *acl, *clone; 187 int rc; 188 189 if (S_ISLNK(inode->i_mode)) 190 return -EOPNOTSUPP; 191 192 acl = jfs_get_acl(inode, ACL_TYPE_ACCESS); 193 if (IS_ERR(acl) || !acl) 194 return PTR_ERR(acl); 195 196 clone = posix_acl_clone(acl, GFP_KERNEL); 197 posix_acl_release(acl); 198 if (!clone) 199 return -ENOMEM; 200 201 rc = posix_acl_chmod_masq(clone, inode->i_mode); 202 if (!rc) { 203 tid_t tid = txBegin(inode->i_sb, 0); 204 mutex_lock(&JFS_IP(inode)->commit_mutex); 205 rc = jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, clone); 206 if (!rc) 207 rc = txCommit(tid, 1, &inode, 0); 208 txEnd(tid); 209 mutex_unlock(&JFS_IP(inode)->commit_mutex); 210 } 211 212 posix_acl_release(clone); 213 return rc; 214 } 215 216 int jfs_setattr(struct dentry *dentry, struct iattr *iattr) 217 { 218 struct inode *inode = dentry->d_inode; 219 int rc; 220 221 rc = inode_change_ok(inode, iattr); 222 if (rc) 223 return rc; 224 225 if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) || 226 (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) { 227 if (vfs_dq_transfer(inode, iattr)) 228 return -EDQUOT; 229 } 230 231 rc = inode_setattr(inode, iattr); 232 233 if (!rc && (iattr->ia_valid & ATTR_MODE)) 234 rc = jfs_acl_chmod(inode); 235 236 return rc; 237 } 238