Jaegeuk Kim | 0a8165d | 2012-11-29 13:28:09 +0900 | [diff] [blame] | 1 | /* |
Jaegeuk Kim | af48b85 | 2012-11-02 17:12:17 +0900 | [diff] [blame] | 2 | * fs/f2fs/acl.c |
| 3 | * |
| 4 | * Copyright (c) 2012 Samsung Electronics Co., Ltd. |
| 5 | * http://www.samsung.com/ |
| 6 | * |
| 7 | * Portions of this code from linux/fs/ext2/acl.c |
| 8 | * |
| 9 | * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de> |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License version 2 as |
| 13 | * published by the Free Software Foundation. |
| 14 | */ |
| 15 | #include <linux/f2fs_fs.h> |
| 16 | #include "f2fs.h" |
| 17 | #include "xattr.h" |
| 18 | #include "acl.h" |
| 19 | |
Jaegeuk Kim | af48b85 | 2012-11-02 17:12:17 +0900 | [diff] [blame] | 20 | static inline size_t f2fs_acl_size(int count) |
| 21 | { |
| 22 | if (count <= 4) { |
| 23 | return sizeof(struct f2fs_acl_header) + |
| 24 | count * sizeof(struct f2fs_acl_entry_short); |
| 25 | } else { |
| 26 | return sizeof(struct f2fs_acl_header) + |
| 27 | 4 * sizeof(struct f2fs_acl_entry_short) + |
| 28 | (count - 4) * sizeof(struct f2fs_acl_entry); |
| 29 | } |
| 30 | } |
| 31 | |
| 32 | static inline int f2fs_acl_count(size_t size) |
| 33 | { |
| 34 | ssize_t s; |
| 35 | size -= sizeof(struct f2fs_acl_header); |
| 36 | s = size - 4 * sizeof(struct f2fs_acl_entry_short); |
| 37 | if (s < 0) { |
| 38 | if (size % sizeof(struct f2fs_acl_entry_short)) |
| 39 | return -1; |
| 40 | return size / sizeof(struct f2fs_acl_entry_short); |
| 41 | } else { |
| 42 | if (s % sizeof(struct f2fs_acl_entry)) |
| 43 | return -1; |
| 44 | return s / sizeof(struct f2fs_acl_entry) + 4; |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | static struct posix_acl *f2fs_acl_from_disk(const char *value, size_t size) |
| 49 | { |
| 50 | int i, count; |
| 51 | struct posix_acl *acl; |
| 52 | struct f2fs_acl_header *hdr = (struct f2fs_acl_header *)value; |
| 53 | struct f2fs_acl_entry *entry = (struct f2fs_acl_entry *)(hdr + 1); |
| 54 | const char *end = value + size; |
| 55 | |
| 56 | if (hdr->a_version != cpu_to_le32(F2FS_ACL_VERSION)) |
| 57 | return ERR_PTR(-EINVAL); |
| 58 | |
| 59 | count = f2fs_acl_count(size); |
| 60 | if (count < 0) |
| 61 | return ERR_PTR(-EINVAL); |
| 62 | if (count == 0) |
| 63 | return NULL; |
| 64 | |
Jaegeuk Kim | dd80240 | 2014-12-18 19:32:36 -0800 | [diff] [blame] | 65 | acl = posix_acl_alloc(count, GFP_NOFS); |
Jaegeuk Kim | af48b85 | 2012-11-02 17:12:17 +0900 | [diff] [blame] | 66 | if (!acl) |
| 67 | return ERR_PTR(-ENOMEM); |
| 68 | |
| 69 | for (i = 0; i < count; i++) { |
| 70 | |
| 71 | if ((char *)entry > end) |
| 72 | goto fail; |
| 73 | |
| 74 | acl->a_entries[i].e_tag = le16_to_cpu(entry->e_tag); |
| 75 | acl->a_entries[i].e_perm = le16_to_cpu(entry->e_perm); |
| 76 | |
| 77 | switch (acl->a_entries[i].e_tag) { |
| 78 | case ACL_USER_OBJ: |
| 79 | case ACL_GROUP_OBJ: |
| 80 | case ACL_MASK: |
| 81 | case ACL_OTHER: |
Jaegeuk Kim | af48b85 | 2012-11-02 17:12:17 +0900 | [diff] [blame] | 82 | entry = (struct f2fs_acl_entry *)((char *)entry + |
| 83 | sizeof(struct f2fs_acl_entry_short)); |
| 84 | break; |
| 85 | |
| 86 | case ACL_USER: |
| 87 | acl->a_entries[i].e_uid = |
| 88 | make_kuid(&init_user_ns, |
| 89 | le32_to_cpu(entry->e_id)); |
| 90 | entry = (struct f2fs_acl_entry *)((char *)entry + |
| 91 | sizeof(struct f2fs_acl_entry)); |
| 92 | break; |
| 93 | case ACL_GROUP: |
| 94 | acl->a_entries[i].e_gid = |
| 95 | make_kgid(&init_user_ns, |
| 96 | le32_to_cpu(entry->e_id)); |
| 97 | entry = (struct f2fs_acl_entry *)((char *)entry + |
| 98 | sizeof(struct f2fs_acl_entry)); |
| 99 | break; |
| 100 | default: |
| 101 | goto fail; |
| 102 | } |
| 103 | } |
| 104 | if ((char *)entry != end) |
| 105 | goto fail; |
| 106 | return acl; |
| 107 | fail: |
| 108 | posix_acl_release(acl); |
| 109 | return ERR_PTR(-EINVAL); |
| 110 | } |
| 111 | |
| 112 | static void *f2fs_acl_to_disk(const struct posix_acl *acl, size_t *size) |
| 113 | { |
| 114 | struct f2fs_acl_header *f2fs_acl; |
| 115 | struct f2fs_acl_entry *entry; |
| 116 | int i; |
| 117 | |
| 118 | f2fs_acl = kmalloc(sizeof(struct f2fs_acl_header) + acl->a_count * |
Jaegeuk Kim | dd80240 | 2014-12-18 19:32:36 -0800 | [diff] [blame] | 119 | sizeof(struct f2fs_acl_entry), GFP_NOFS); |
Jaegeuk Kim | af48b85 | 2012-11-02 17:12:17 +0900 | [diff] [blame] | 120 | if (!f2fs_acl) |
| 121 | return ERR_PTR(-ENOMEM); |
| 122 | |
| 123 | f2fs_acl->a_version = cpu_to_le32(F2FS_ACL_VERSION); |
| 124 | entry = (struct f2fs_acl_entry *)(f2fs_acl + 1); |
| 125 | |
| 126 | for (i = 0; i < acl->a_count; i++) { |
| 127 | |
| 128 | entry->e_tag = cpu_to_le16(acl->a_entries[i].e_tag); |
| 129 | entry->e_perm = cpu_to_le16(acl->a_entries[i].e_perm); |
| 130 | |
| 131 | switch (acl->a_entries[i].e_tag) { |
| 132 | case ACL_USER: |
| 133 | entry->e_id = cpu_to_le32( |
| 134 | from_kuid(&init_user_ns, |
| 135 | acl->a_entries[i].e_uid)); |
| 136 | entry = (struct f2fs_acl_entry *)((char *)entry + |
| 137 | sizeof(struct f2fs_acl_entry)); |
| 138 | break; |
| 139 | case ACL_GROUP: |
| 140 | entry->e_id = cpu_to_le32( |
| 141 | from_kgid(&init_user_ns, |
| 142 | acl->a_entries[i].e_gid)); |
| 143 | entry = (struct f2fs_acl_entry *)((char *)entry + |
| 144 | sizeof(struct f2fs_acl_entry)); |
| 145 | break; |
| 146 | case ACL_USER_OBJ: |
| 147 | case ACL_GROUP_OBJ: |
| 148 | case ACL_MASK: |
| 149 | case ACL_OTHER: |
| 150 | entry = (struct f2fs_acl_entry *)((char *)entry + |
| 151 | sizeof(struct f2fs_acl_entry_short)); |
| 152 | break; |
| 153 | default: |
| 154 | goto fail; |
| 155 | } |
| 156 | } |
| 157 | *size = f2fs_acl_size(acl->a_count); |
| 158 | return (void *)f2fs_acl; |
| 159 | |
| 160 | fail: |
| 161 | kfree(f2fs_acl); |
| 162 | return ERR_PTR(-EINVAL); |
| 163 | } |
| 164 | |
Jaegeuk Kim | bce8d11 | 2014-10-13 19:42:53 -0700 | [diff] [blame] | 165 | static struct posix_acl *__f2fs_get_acl(struct inode *inode, int type, |
| 166 | struct page *dpage) |
Jaegeuk Kim | af48b85 | 2012-11-02 17:12:17 +0900 | [diff] [blame] | 167 | { |
Jaegeuk Kim | af48b85 | 2012-11-02 17:12:17 +0900 | [diff] [blame] | 168 | int name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT; |
| 169 | void *value = NULL; |
| 170 | struct posix_acl *acl; |
| 171 | int retval; |
| 172 | |
Jaegeuk Kim | af48b85 | 2012-11-02 17:12:17 +0900 | [diff] [blame] | 173 | if (type == ACL_TYPE_ACCESS) |
| 174 | name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS; |
| 175 | |
Jaegeuk Kim | bce8d11 | 2014-10-13 19:42:53 -0700 | [diff] [blame] | 176 | retval = f2fs_getxattr(inode, name_index, "", NULL, 0, dpage); |
Jaegeuk Kim | af48b85 | 2012-11-02 17:12:17 +0900 | [diff] [blame] | 177 | if (retval > 0) { |
Jaegeuk Kim | 808a1d7 | 2014-03-20 22:21:08 +0900 | [diff] [blame] | 178 | value = kmalloc(retval, GFP_F2FS_ZERO); |
Jaegeuk Kim | af48b85 | 2012-11-02 17:12:17 +0900 | [diff] [blame] | 179 | if (!value) |
| 180 | return ERR_PTR(-ENOMEM); |
Jaegeuk Kim | bce8d11 | 2014-10-13 19:42:53 -0700 | [diff] [blame] | 181 | retval = f2fs_getxattr(inode, name_index, "", value, |
| 182 | retval, dpage); |
Jaegeuk Kim | af48b85 | 2012-11-02 17:12:17 +0900 | [diff] [blame] | 183 | } |
| 184 | |
Jaegeuk Kim | c1b75ea | 2013-01-03 09:24:28 +0900 | [diff] [blame] | 185 | if (retval > 0) |
Jaegeuk Kim | af48b85 | 2012-11-02 17:12:17 +0900 | [diff] [blame] | 186 | acl = f2fs_acl_from_disk(value, retval); |
Jaegeuk Kim | c1b75ea | 2013-01-03 09:24:28 +0900 | [diff] [blame] | 187 | else if (retval == -ENODATA) |
| 188 | acl = NULL; |
| 189 | else |
| 190 | acl = ERR_PTR(retval); |
Jaegeuk Kim | af48b85 | 2012-11-02 17:12:17 +0900 | [diff] [blame] | 191 | kfree(value); |
Jaegeuk Kim | c1b75ea | 2013-01-03 09:24:28 +0900 | [diff] [blame] | 192 | |
Jaegeuk Kim | af48b85 | 2012-11-02 17:12:17 +0900 | [diff] [blame] | 193 | if (!IS_ERR(acl)) |
| 194 | set_cached_acl(inode, type, acl); |
| 195 | |
| 196 | return acl; |
| 197 | } |
| 198 | |
Jaegeuk Kim | bce8d11 | 2014-10-13 19:42:53 -0700 | [diff] [blame] | 199 | struct posix_acl *f2fs_get_acl(struct inode *inode, int type) |
| 200 | { |
| 201 | return __f2fs_get_acl(inode, type, NULL); |
| 202 | } |
| 203 | |
Christoph Hellwig | a6dda0e | 2013-12-20 05:16:45 -0800 | [diff] [blame] | 204 | static int __f2fs_set_acl(struct inode *inode, int type, |
Jaegeuk Kim | 2ed2d5b | 2013-10-28 13:17:54 +0900 | [diff] [blame] | 205 | struct posix_acl *acl, struct page *ipage) |
Jaegeuk Kim | af48b85 | 2012-11-02 17:12:17 +0900 | [diff] [blame] | 206 | { |
Jaegeuk Kim | af48b85 | 2012-11-02 17:12:17 +0900 | [diff] [blame] | 207 | struct f2fs_inode_info *fi = F2FS_I(inode); |
| 208 | int name_index; |
| 209 | void *value = NULL; |
| 210 | size_t size = 0; |
| 211 | int error; |
| 212 | |
Jaegeuk Kim | af48b85 | 2012-11-02 17:12:17 +0900 | [diff] [blame] | 213 | switch (type) { |
| 214 | case ACL_TYPE_ACCESS: |
| 215 | name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS; |
| 216 | if (acl) { |
| 217 | error = posix_acl_equiv_mode(acl, &inode->i_mode); |
| 218 | if (error < 0) |
| 219 | return error; |
| 220 | set_acl_inode(fi, inode->i_mode); |
| 221 | if (error == 0) |
| 222 | acl = NULL; |
| 223 | } |
| 224 | break; |
| 225 | |
| 226 | case ACL_TYPE_DEFAULT: |
| 227 | name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT; |
| 228 | if (!S_ISDIR(inode->i_mode)) |
| 229 | return acl ? -EACCES : 0; |
| 230 | break; |
| 231 | |
| 232 | default: |
| 233 | return -EINVAL; |
| 234 | } |
| 235 | |
| 236 | if (acl) { |
| 237 | value = f2fs_acl_to_disk(acl, &size); |
| 238 | if (IS_ERR(value)) { |
Gu Zheng | fa52872 | 2014-10-20 17:45:52 +0800 | [diff] [blame] | 239 | clear_inode_flag(fi, FI_ACL_MODE); |
Jaegeuk Kim | af48b85 | 2012-11-02 17:12:17 +0900 | [diff] [blame] | 240 | return (int)PTR_ERR(value); |
| 241 | } |
| 242 | } |
| 243 | |
Jaegeuk Kim | c02745e | 2014-04-23 12:23:14 +0900 | [diff] [blame] | 244 | error = f2fs_setxattr(inode, name_index, "", value, size, ipage, 0); |
Jaegeuk Kim | af48b85 | 2012-11-02 17:12:17 +0900 | [diff] [blame] | 245 | |
| 246 | kfree(value); |
| 247 | if (!error) |
| 248 | set_cached_acl(inode, type, acl); |
| 249 | |
Gu Zheng | fa52872 | 2014-10-20 17:45:52 +0800 | [diff] [blame] | 250 | clear_inode_flag(fi, FI_ACL_MODE); |
Jaegeuk Kim | af48b85 | 2012-11-02 17:12:17 +0900 | [diff] [blame] | 251 | return error; |
| 252 | } |
| 253 | |
Christoph Hellwig | a6dda0e | 2013-12-20 05:16:45 -0800 | [diff] [blame] | 254 | int f2fs_set_acl(struct inode *inode, struct posix_acl *acl, int type) |
Jaegeuk Kim | af48b85 | 2012-11-02 17:12:17 +0900 | [diff] [blame] | 255 | { |
Christoph Hellwig | a6dda0e | 2013-12-20 05:16:45 -0800 | [diff] [blame] | 256 | return __f2fs_set_acl(inode, type, acl, NULL); |
Jaegeuk Kim | af48b85 | 2012-11-02 17:12:17 +0900 | [diff] [blame] | 257 | } |
| 258 | |
Jaegeuk Kim | bce8d11 | 2014-10-13 19:42:53 -0700 | [diff] [blame] | 259 | /* |
| 260 | * Most part of f2fs_acl_clone, f2fs_acl_create_masq, f2fs_acl_create |
| 261 | * are copied from posix_acl.c |
| 262 | */ |
| 263 | static struct posix_acl *f2fs_acl_clone(const struct posix_acl *acl, |
| 264 | gfp_t flags) |
Jaegeuk Kim | af48b85 | 2012-11-02 17:12:17 +0900 | [diff] [blame] | 265 | { |
Jaegeuk Kim | bce8d11 | 2014-10-13 19:42:53 -0700 | [diff] [blame] | 266 | struct posix_acl *clone = NULL; |
| 267 | |
| 268 | if (acl) { |
| 269 | int size = sizeof(struct posix_acl) + acl->a_count * |
| 270 | sizeof(struct posix_acl_entry); |
| 271 | clone = kmemdup(acl, size, flags); |
| 272 | if (clone) |
| 273 | atomic_set(&clone->a_refcount, 1); |
| 274 | } |
| 275 | return clone; |
| 276 | } |
| 277 | |
| 278 | static int f2fs_acl_create_masq(struct posix_acl *acl, umode_t *mode_p) |
| 279 | { |
| 280 | struct posix_acl_entry *pa, *pe; |
| 281 | struct posix_acl_entry *group_obj = NULL, *mask_obj = NULL; |
| 282 | umode_t mode = *mode_p; |
| 283 | int not_equiv = 0; |
| 284 | |
| 285 | /* assert(atomic_read(acl->a_refcount) == 1); */ |
| 286 | |
| 287 | FOREACH_ACL_ENTRY(pa, acl, pe) { |
| 288 | switch(pa->e_tag) { |
| 289 | case ACL_USER_OBJ: |
| 290 | pa->e_perm &= (mode >> 6) | ~S_IRWXO; |
| 291 | mode &= (pa->e_perm << 6) | ~S_IRWXU; |
| 292 | break; |
| 293 | |
| 294 | case ACL_USER: |
| 295 | case ACL_GROUP: |
| 296 | not_equiv = 1; |
| 297 | break; |
| 298 | |
| 299 | case ACL_GROUP_OBJ: |
| 300 | group_obj = pa; |
| 301 | break; |
| 302 | |
| 303 | case ACL_OTHER: |
| 304 | pa->e_perm &= mode | ~S_IRWXO; |
| 305 | mode &= pa->e_perm | ~S_IRWXO; |
| 306 | break; |
| 307 | |
| 308 | case ACL_MASK: |
| 309 | mask_obj = pa; |
| 310 | not_equiv = 1; |
| 311 | break; |
| 312 | |
| 313 | default: |
| 314 | return -EIO; |
| 315 | } |
| 316 | } |
| 317 | |
| 318 | if (mask_obj) { |
| 319 | mask_obj->e_perm &= (mode >> 3) | ~S_IRWXO; |
| 320 | mode &= (mask_obj->e_perm << 3) | ~S_IRWXG; |
| 321 | } else { |
| 322 | if (!group_obj) |
| 323 | return -EIO; |
| 324 | group_obj->e_perm &= (mode >> 3) | ~S_IRWXO; |
| 325 | mode &= (group_obj->e_perm << 3) | ~S_IRWXG; |
| 326 | } |
| 327 | |
| 328 | *mode_p = (*mode_p & ~S_IRWXUGO) | mode; |
| 329 | return not_equiv; |
| 330 | } |
| 331 | |
| 332 | static int f2fs_acl_create(struct inode *dir, umode_t *mode, |
| 333 | struct posix_acl **default_acl, struct posix_acl **acl, |
| 334 | struct page *dpage) |
| 335 | { |
| 336 | struct posix_acl *p; |
| 337 | int ret; |
| 338 | |
| 339 | if (S_ISLNK(*mode) || !IS_POSIXACL(dir)) |
| 340 | goto no_acl; |
| 341 | |
| 342 | p = __f2fs_get_acl(dir, ACL_TYPE_DEFAULT, dpage); |
| 343 | if (IS_ERR(p)) { |
| 344 | if (p == ERR_PTR(-EOPNOTSUPP)) |
| 345 | goto apply_umask; |
| 346 | return PTR_ERR(p); |
| 347 | } |
| 348 | |
| 349 | if (!p) |
| 350 | goto apply_umask; |
| 351 | |
| 352 | *acl = f2fs_acl_clone(p, GFP_NOFS); |
| 353 | if (!*acl) |
Chao Yu | 83dfe53 | 2015-03-09 18:18:19 +0800 | [diff] [blame] | 354 | goto no_mem; |
Jaegeuk Kim | bce8d11 | 2014-10-13 19:42:53 -0700 | [diff] [blame] | 355 | |
| 356 | ret = f2fs_acl_create_masq(*acl, mode); |
Chao Yu | 83dfe53 | 2015-03-09 18:18:19 +0800 | [diff] [blame] | 357 | if (ret < 0) |
| 358 | goto no_mem_clone; |
Jaegeuk Kim | bce8d11 | 2014-10-13 19:42:53 -0700 | [diff] [blame] | 359 | |
| 360 | if (ret == 0) { |
| 361 | posix_acl_release(*acl); |
| 362 | *acl = NULL; |
| 363 | } |
| 364 | |
| 365 | if (!S_ISDIR(*mode)) { |
| 366 | posix_acl_release(p); |
| 367 | *default_acl = NULL; |
| 368 | } else { |
| 369 | *default_acl = p; |
| 370 | } |
| 371 | return 0; |
| 372 | |
| 373 | apply_umask: |
| 374 | *mode &= ~current_umask(); |
| 375 | no_acl: |
| 376 | *default_acl = NULL; |
| 377 | *acl = NULL; |
| 378 | return 0; |
Chao Yu | 83dfe53 | 2015-03-09 18:18:19 +0800 | [diff] [blame] | 379 | |
| 380 | no_mem_clone: |
| 381 | posix_acl_release(*acl); |
| 382 | no_mem: |
| 383 | posix_acl_release(p); |
| 384 | return -ENOMEM; |
Jaegeuk Kim | bce8d11 | 2014-10-13 19:42:53 -0700 | [diff] [blame] | 385 | } |
| 386 | |
| 387 | int f2fs_init_acl(struct inode *inode, struct inode *dir, struct page *ipage, |
| 388 | struct page *dpage) |
| 389 | { |
| 390 | struct posix_acl *default_acl = NULL, *acl = NULL; |
Christoph Hellwig | a6dda0e | 2013-12-20 05:16:45 -0800 | [diff] [blame] | 391 | int error = 0; |
Jaegeuk Kim | af48b85 | 2012-11-02 17:12:17 +0900 | [diff] [blame] | 392 | |
Jaegeuk Kim | bce8d11 | 2014-10-13 19:42:53 -0700 | [diff] [blame] | 393 | error = f2fs_acl_create(dir, &inode->i_mode, &default_acl, &acl, dpage); |
Jaegeuk Kim | af48b85 | 2012-11-02 17:12:17 +0900 | [diff] [blame] | 394 | if (error) |
| 395 | return error; |
Jaegeuk Kim | b8b60e1 | 2013-10-28 13:12:09 +0900 | [diff] [blame] | 396 | |
Christoph Hellwig | a6dda0e | 2013-12-20 05:16:45 -0800 | [diff] [blame] | 397 | if (default_acl) { |
| 398 | error = __f2fs_set_acl(inode, ACL_TYPE_DEFAULT, default_acl, |
| 399 | ipage); |
| 400 | posix_acl_release(default_acl); |
| 401 | } |
| 402 | if (acl) { |
Kinglong Mee | 3b6709b | 2015-01-24 17:06:25 +0800 | [diff] [blame] | 403 | if (!error) |
Christoph Hellwig | a6dda0e | 2013-12-20 05:16:45 -0800 | [diff] [blame] | 404 | error = __f2fs_set_acl(inode, ACL_TYPE_ACCESS, acl, |
| 405 | ipage); |
| 406 | posix_acl_release(acl); |
Jaegeuk Kim | af48b85 | 2012-11-02 17:12:17 +0900 | [diff] [blame] | 407 | } |
| 408 | |
Jaegeuk Kim | af48b85 | 2012-11-02 17:12:17 +0900 | [diff] [blame] | 409 | return error; |
| 410 | } |