1 /* 2 * linux/fs/hfsplus/xattr.c 3 * 4 * Vyacheslav Dubeyko <slava@dubeyko.com> 5 * 6 * Logic of processing extended attributes 7 */ 8 9 #include "hfsplus_fs.h" 10 #include <linux/posix_acl_xattr.h> 11 #include <linux/nls.h> 12 #include "xattr.h" 13 #include "acl.h" 14 15 static int hfsplus_removexattr(struct inode *inode, const char *name); 16 17 const struct xattr_handler *hfsplus_xattr_handlers[] = { 18 &hfsplus_xattr_osx_handler, 19 &hfsplus_xattr_user_handler, 20 &hfsplus_xattr_trusted_handler, 21 #ifdef CONFIG_HFSPLUS_FS_POSIX_ACL 22 &posix_acl_access_xattr_handler, 23 &posix_acl_default_xattr_handler, 24 #endif 25 &hfsplus_xattr_security_handler, 26 NULL 27 }; 28 29 static int strcmp_xattr_finder_info(const char *name) 30 { 31 if (name) { 32 return strncmp(name, HFSPLUS_XATTR_FINDER_INFO_NAME, 33 sizeof(HFSPLUS_XATTR_FINDER_INFO_NAME)); 34 } 35 return -1; 36 } 37 38 static int strcmp_xattr_acl(const char *name) 39 { 40 if (name) { 41 return strncmp(name, HFSPLUS_XATTR_ACL_NAME, 42 sizeof(HFSPLUS_XATTR_ACL_NAME)); 43 } 44 return -1; 45 } 46 47 static bool is_known_namespace(const char *name) 48 { 49 if (strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) && 50 strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN) && 51 strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) && 52 strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN)) 53 return false; 54 55 return true; 56 } 57 58 static void hfsplus_init_header_node(struct inode *attr_file, 59 u32 clump_size, 60 char *buf, u16 node_size) 61 { 62 struct hfs_bnode_desc *desc; 63 struct hfs_btree_header_rec *head; 64 u16 offset; 65 __be16 *rec_offsets; 66 u32 hdr_node_map_rec_bits; 67 char *bmp; 68 u32 used_nodes; 69 u32 used_bmp_bytes; 70 u64 tmp; 71 72 hfs_dbg(ATTR_MOD, "init_hdr_attr_file: clump %u, node_size %u\n", 73 clump_size, node_size); 74 75 /* The end of the node contains list of record offsets */ 76 rec_offsets = (__be16 *)(buf + node_size); 77 78 desc = (struct hfs_bnode_desc *)buf; 79 desc->type = HFS_NODE_HEADER; 80 desc->num_recs = cpu_to_be16(HFSPLUS_BTREE_HDR_NODE_RECS_COUNT); 81 offset = sizeof(struct hfs_bnode_desc); 82 *--rec_offsets = cpu_to_be16(offset); 83 84 head = (struct hfs_btree_header_rec *)(buf + offset); 85 head->node_size = cpu_to_be16(node_size); 86 tmp = i_size_read(attr_file); 87 do_div(tmp, node_size); 88 head->node_count = cpu_to_be32(tmp); 89 head->free_nodes = cpu_to_be32(be32_to_cpu(head->node_count) - 1); 90 head->clump_size = cpu_to_be32(clump_size); 91 head->attributes |= cpu_to_be32(HFS_TREE_BIGKEYS | HFS_TREE_VARIDXKEYS); 92 head->max_key_len = cpu_to_be16(HFSPLUS_ATTR_KEYLEN - sizeof(u16)); 93 offset += sizeof(struct hfs_btree_header_rec); 94 *--rec_offsets = cpu_to_be16(offset); 95 offset += HFSPLUS_BTREE_HDR_USER_BYTES; 96 *--rec_offsets = cpu_to_be16(offset); 97 98 hdr_node_map_rec_bits = 8 * (node_size - offset - (4 * sizeof(u16))); 99 if (be32_to_cpu(head->node_count) > hdr_node_map_rec_bits) { 100 u32 map_node_bits; 101 u32 map_nodes; 102 103 desc->next = cpu_to_be32(be32_to_cpu(head->leaf_tail) + 1); 104 map_node_bits = 8 * (node_size - sizeof(struct hfs_bnode_desc) - 105 (2 * sizeof(u16)) - 2); 106 map_nodes = (be32_to_cpu(head->node_count) - 107 hdr_node_map_rec_bits + 108 (map_node_bits - 1)) / map_node_bits; 109 be32_add_cpu(&head->free_nodes, 0 - map_nodes); 110 } 111 112 bmp = buf + offset; 113 used_nodes = 114 be32_to_cpu(head->node_count) - be32_to_cpu(head->free_nodes); 115 used_bmp_bytes = used_nodes / 8; 116 if (used_bmp_bytes) { 117 memset(bmp, 0xFF, used_bmp_bytes); 118 bmp += used_bmp_bytes; 119 used_nodes %= 8; 120 } 121 *bmp = ~(0xFF >> used_nodes); 122 offset += hdr_node_map_rec_bits / 8; 123 *--rec_offsets = cpu_to_be16(offset); 124 } 125 126 static int hfsplus_create_attributes_file(struct super_block *sb) 127 { 128 int err = 0; 129 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 130 struct inode *attr_file; 131 struct hfsplus_inode_info *hip; 132 u32 clump_size; 133 u16 node_size = HFSPLUS_ATTR_TREE_NODE_SIZE; 134 char *buf; 135 int index, written; 136 struct address_space *mapping; 137 struct page *page; 138 int old_state = HFSPLUS_EMPTY_ATTR_TREE; 139 140 hfs_dbg(ATTR_MOD, "create_attr_file: ino %d\n", HFSPLUS_ATTR_CNID); 141 142 check_attr_tree_state_again: 143 switch (atomic_read(&sbi->attr_tree_state)) { 144 case HFSPLUS_EMPTY_ATTR_TREE: 145 if (old_state != atomic_cmpxchg(&sbi->attr_tree_state, 146 old_state, 147 HFSPLUS_CREATING_ATTR_TREE)) 148 goto check_attr_tree_state_again; 149 break; 150 case HFSPLUS_CREATING_ATTR_TREE: 151 /* 152 * This state means that another thread is in process 153 * of AttributesFile creation. Theoretically, it is 154 * possible to be here. But really __setxattr() method 155 * first of all calls hfs_find_init() for lookup in 156 * B-tree of CatalogFile. This method locks mutex of 157 * CatalogFile's B-tree. As a result, if some thread 158 * is inside AttributedFile creation operation then 159 * another threads will be waiting unlocking of 160 * CatalogFile's B-tree's mutex. However, if code will 161 * change then we will return error code (-EAGAIN) from 162 * here. Really, it means that first try to set of xattr 163 * fails with error but second attempt will have success. 164 */ 165 return -EAGAIN; 166 case HFSPLUS_VALID_ATTR_TREE: 167 return 0; 168 case HFSPLUS_FAILED_ATTR_TREE: 169 return -EOPNOTSUPP; 170 default: 171 BUG(); 172 } 173 174 attr_file = hfsplus_iget(sb, HFSPLUS_ATTR_CNID); 175 if (IS_ERR(attr_file)) { 176 pr_err("failed to load attributes file\n"); 177 return PTR_ERR(attr_file); 178 } 179 180 BUG_ON(i_size_read(attr_file) != 0); 181 182 hip = HFSPLUS_I(attr_file); 183 184 clump_size = hfsplus_calc_btree_clump_size(sb->s_blocksize, 185 node_size, 186 sbi->sect_count, 187 HFSPLUS_ATTR_CNID); 188 189 mutex_lock(&hip->extents_lock); 190 hip->clump_blocks = clump_size >> sbi->alloc_blksz_shift; 191 mutex_unlock(&hip->extents_lock); 192 193 if (sbi->free_blocks <= (hip->clump_blocks << 1)) { 194 err = -ENOSPC; 195 goto end_attr_file_creation; 196 } 197 198 while (hip->alloc_blocks < hip->clump_blocks) { 199 err = hfsplus_file_extend(attr_file, false); 200 if (unlikely(err)) { 201 pr_err("failed to extend attributes file\n"); 202 goto end_attr_file_creation; 203 } 204 hip->phys_size = attr_file->i_size = 205 (loff_t)hip->alloc_blocks << sbi->alloc_blksz_shift; 206 hip->fs_blocks = hip->alloc_blocks << sbi->fs_shift; 207 inode_set_bytes(attr_file, attr_file->i_size); 208 } 209 210 buf = kzalloc(node_size, GFP_NOFS); 211 if (!buf) { 212 pr_err("failed to allocate memory for header node\n"); 213 err = -ENOMEM; 214 goto end_attr_file_creation; 215 } 216 217 hfsplus_init_header_node(attr_file, clump_size, buf, node_size); 218 219 mapping = attr_file->i_mapping; 220 221 index = 0; 222 written = 0; 223 for (; written < node_size; index++, written += PAGE_CACHE_SIZE) { 224 void *kaddr; 225 226 page = read_mapping_page(mapping, index, NULL); 227 if (IS_ERR(page)) { 228 err = PTR_ERR(page); 229 goto failed_header_node_init; 230 } 231 232 kaddr = kmap_atomic(page); 233 memcpy(kaddr, buf + written, 234 min_t(size_t, PAGE_CACHE_SIZE, node_size - written)); 235 kunmap_atomic(kaddr); 236 237 set_page_dirty(page); 238 page_cache_release(page); 239 } 240 241 hfsplus_mark_inode_dirty(attr_file, HFSPLUS_I_ATTR_DIRTY); 242 243 sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID); 244 if (!sbi->attr_tree) 245 pr_err("failed to load attributes file\n"); 246 247 failed_header_node_init: 248 kfree(buf); 249 250 end_attr_file_creation: 251 iput(attr_file); 252 253 if (!err) 254 atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE); 255 else if (err == -ENOSPC) 256 atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE); 257 else 258 atomic_set(&sbi->attr_tree_state, HFSPLUS_FAILED_ATTR_TREE); 259 260 return err; 261 } 262 263 int __hfsplus_setxattr(struct inode *inode, const char *name, 264 const void *value, size_t size, int flags) 265 { 266 int err = 0; 267 struct hfs_find_data cat_fd; 268 hfsplus_cat_entry entry; 269 u16 cat_entry_flags, cat_entry_type; 270 u16 folder_finderinfo_len = sizeof(struct DInfo) + 271 sizeof(struct DXInfo); 272 u16 file_finderinfo_len = sizeof(struct FInfo) + 273 sizeof(struct FXInfo); 274 275 if ((!S_ISREG(inode->i_mode) && 276 !S_ISDIR(inode->i_mode)) || 277 HFSPLUS_IS_RSRC(inode)) 278 return -EOPNOTSUPP; 279 280 if (value == NULL) 281 return hfsplus_removexattr(inode, name); 282 283 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd); 284 if (err) { 285 pr_err("can't init xattr find struct\n"); 286 return err; 287 } 288 289 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd); 290 if (err) { 291 pr_err("catalog searching failed\n"); 292 goto end_setxattr; 293 } 294 295 if (!strcmp_xattr_finder_info(name)) { 296 if (flags & XATTR_CREATE) { 297 pr_err("xattr exists yet\n"); 298 err = -EOPNOTSUPP; 299 goto end_setxattr; 300 } 301 hfs_bnode_read(cat_fd.bnode, &entry, cat_fd.entryoffset, 302 sizeof(hfsplus_cat_entry)); 303 if (be16_to_cpu(entry.type) == HFSPLUS_FOLDER) { 304 if (size == folder_finderinfo_len) { 305 memcpy(&entry.folder.user_info, value, 306 folder_finderinfo_len); 307 hfs_bnode_write(cat_fd.bnode, &entry, 308 cat_fd.entryoffset, 309 sizeof(struct hfsplus_cat_folder)); 310 hfsplus_mark_inode_dirty(inode, 311 HFSPLUS_I_CAT_DIRTY); 312 } else { 313 err = -ERANGE; 314 goto end_setxattr; 315 } 316 } else if (be16_to_cpu(entry.type) == HFSPLUS_FILE) { 317 if (size == file_finderinfo_len) { 318 memcpy(&entry.file.user_info, value, 319 file_finderinfo_len); 320 hfs_bnode_write(cat_fd.bnode, &entry, 321 cat_fd.entryoffset, 322 sizeof(struct hfsplus_cat_file)); 323 hfsplus_mark_inode_dirty(inode, 324 HFSPLUS_I_CAT_DIRTY); 325 } else { 326 err = -ERANGE; 327 goto end_setxattr; 328 } 329 } else { 330 err = -EOPNOTSUPP; 331 goto end_setxattr; 332 } 333 goto end_setxattr; 334 } 335 336 if (!HFSPLUS_SB(inode->i_sb)->attr_tree) { 337 err = hfsplus_create_attributes_file(inode->i_sb); 338 if (unlikely(err)) 339 goto end_setxattr; 340 } 341 342 if (hfsplus_attr_exists(inode, name)) { 343 if (flags & XATTR_CREATE) { 344 pr_err("xattr exists yet\n"); 345 err = -EOPNOTSUPP; 346 goto end_setxattr; 347 } 348 err = hfsplus_delete_attr(inode, name); 349 if (err) 350 goto end_setxattr; 351 err = hfsplus_create_attr(inode, name, value, size); 352 if (err) 353 goto end_setxattr; 354 } else { 355 if (flags & XATTR_REPLACE) { 356 pr_err("cannot replace xattr\n"); 357 err = -EOPNOTSUPP; 358 goto end_setxattr; 359 } 360 err = hfsplus_create_attr(inode, name, value, size); 361 if (err) 362 goto end_setxattr; 363 } 364 365 cat_entry_type = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset); 366 if (cat_entry_type == HFSPLUS_FOLDER) { 367 cat_entry_flags = hfs_bnode_read_u16(cat_fd.bnode, 368 cat_fd.entryoffset + 369 offsetof(struct hfsplus_cat_folder, flags)); 370 cat_entry_flags |= HFSPLUS_XATTR_EXISTS; 371 if (!strcmp_xattr_acl(name)) 372 cat_entry_flags |= HFSPLUS_ACL_EXISTS; 373 hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset + 374 offsetof(struct hfsplus_cat_folder, flags), 375 cat_entry_flags); 376 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY); 377 } else if (cat_entry_type == HFSPLUS_FILE) { 378 cat_entry_flags = hfs_bnode_read_u16(cat_fd.bnode, 379 cat_fd.entryoffset + 380 offsetof(struct hfsplus_cat_file, flags)); 381 cat_entry_flags |= HFSPLUS_XATTR_EXISTS; 382 if (!strcmp_xattr_acl(name)) 383 cat_entry_flags |= HFSPLUS_ACL_EXISTS; 384 hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset + 385 offsetof(struct hfsplus_cat_file, flags), 386 cat_entry_flags); 387 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY); 388 } else { 389 pr_err("invalid catalog entry type\n"); 390 err = -EIO; 391 goto end_setxattr; 392 } 393 394 end_setxattr: 395 hfs_find_exit(&cat_fd); 396 return err; 397 } 398 399 static int name_len(const char *xattr_name, int xattr_name_len) 400 { 401 int len = xattr_name_len + 1; 402 403 if (!is_known_namespace(xattr_name)) 404 len += XATTR_MAC_OSX_PREFIX_LEN; 405 406 return len; 407 } 408 409 static int copy_name(char *buffer, const char *xattr_name, int name_len) 410 { 411 int len = name_len; 412 int offset = 0; 413 414 if (!is_known_namespace(xattr_name)) { 415 strncpy(buffer, XATTR_MAC_OSX_PREFIX, XATTR_MAC_OSX_PREFIX_LEN); 416 offset += XATTR_MAC_OSX_PREFIX_LEN; 417 len += XATTR_MAC_OSX_PREFIX_LEN; 418 } 419 420 strncpy(buffer + offset, xattr_name, name_len); 421 memset(buffer + offset + name_len, 0, 1); 422 len += 1; 423 424 return len; 425 } 426 427 int hfsplus_setxattr(struct dentry *dentry, const char *name, 428 const void *value, size_t size, int flags, 429 const char *prefix, size_t prefixlen) 430 { 431 char *xattr_name; 432 int res; 433 434 xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1, 435 GFP_KERNEL); 436 if (!xattr_name) 437 return -ENOMEM; 438 strcpy(xattr_name, prefix); 439 strcpy(xattr_name + prefixlen, name); 440 res = __hfsplus_setxattr(d_inode(dentry), xattr_name, value, size, 441 flags); 442 kfree(xattr_name); 443 return res; 444 } 445 446 static ssize_t hfsplus_getxattr_finder_info(struct inode *inode, 447 void *value, size_t size) 448 { 449 ssize_t res = 0; 450 struct hfs_find_data fd; 451 u16 entry_type; 452 u16 folder_rec_len = sizeof(struct DInfo) + sizeof(struct DXInfo); 453 u16 file_rec_len = sizeof(struct FInfo) + sizeof(struct FXInfo); 454 u16 record_len = max(folder_rec_len, file_rec_len); 455 u8 folder_finder_info[sizeof(struct DInfo) + sizeof(struct DXInfo)]; 456 u8 file_finder_info[sizeof(struct FInfo) + sizeof(struct FXInfo)]; 457 458 if (size >= record_len) { 459 res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd); 460 if (res) { 461 pr_err("can't init xattr find struct\n"); 462 return res; 463 } 464 res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); 465 if (res) 466 goto end_getxattr_finder_info; 467 entry_type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset); 468 469 if (entry_type == HFSPLUS_FOLDER) { 470 hfs_bnode_read(fd.bnode, folder_finder_info, 471 fd.entryoffset + 472 offsetof(struct hfsplus_cat_folder, user_info), 473 folder_rec_len); 474 memcpy(value, folder_finder_info, folder_rec_len); 475 res = folder_rec_len; 476 } else if (entry_type == HFSPLUS_FILE) { 477 hfs_bnode_read(fd.bnode, file_finder_info, 478 fd.entryoffset + 479 offsetof(struct hfsplus_cat_file, user_info), 480 file_rec_len); 481 memcpy(value, file_finder_info, file_rec_len); 482 res = file_rec_len; 483 } else { 484 res = -EOPNOTSUPP; 485 goto end_getxattr_finder_info; 486 } 487 } else 488 res = size ? -ERANGE : record_len; 489 490 end_getxattr_finder_info: 491 if (size >= record_len) 492 hfs_find_exit(&fd); 493 return res; 494 } 495 496 ssize_t __hfsplus_getxattr(struct inode *inode, const char *name, 497 void *value, size_t size) 498 { 499 struct hfs_find_data fd; 500 hfsplus_attr_entry *entry; 501 __be32 xattr_record_type; 502 u32 record_type; 503 u16 record_length = 0; 504 ssize_t res = 0; 505 506 if ((!S_ISREG(inode->i_mode) && 507 !S_ISDIR(inode->i_mode)) || 508 HFSPLUS_IS_RSRC(inode)) 509 return -EOPNOTSUPP; 510 511 if (!strcmp_xattr_finder_info(name)) 512 return hfsplus_getxattr_finder_info(inode, value, size); 513 514 if (!HFSPLUS_SB(inode->i_sb)->attr_tree) 515 return -EOPNOTSUPP; 516 517 entry = hfsplus_alloc_attr_entry(); 518 if (!entry) { 519 pr_err("can't allocate xattr entry\n"); 520 return -ENOMEM; 521 } 522 523 res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->attr_tree, &fd); 524 if (res) { 525 pr_err("can't init xattr find struct\n"); 526 goto failed_getxattr_init; 527 } 528 529 res = hfsplus_find_attr(inode->i_sb, inode->i_ino, name, &fd); 530 if (res) { 531 if (res == -ENOENT) 532 res = -ENODATA; 533 else 534 pr_err("xattr searching failed\n"); 535 goto out; 536 } 537 538 hfs_bnode_read(fd.bnode, &xattr_record_type, 539 fd.entryoffset, sizeof(xattr_record_type)); 540 record_type = be32_to_cpu(xattr_record_type); 541 if (record_type == HFSPLUS_ATTR_INLINE_DATA) { 542 record_length = hfs_bnode_read_u16(fd.bnode, 543 fd.entryoffset + 544 offsetof(struct hfsplus_attr_inline_data, 545 length)); 546 if (record_length > HFSPLUS_MAX_INLINE_DATA_SIZE) { 547 pr_err("invalid xattr record size\n"); 548 res = -EIO; 549 goto out; 550 } 551 } else if (record_type == HFSPLUS_ATTR_FORK_DATA || 552 record_type == HFSPLUS_ATTR_EXTENTS) { 553 pr_err("only inline data xattr are supported\n"); 554 res = -EOPNOTSUPP; 555 goto out; 556 } else { 557 pr_err("invalid xattr record\n"); 558 res = -EIO; 559 goto out; 560 } 561 562 if (size) { 563 hfs_bnode_read(fd.bnode, entry, fd.entryoffset, 564 offsetof(struct hfsplus_attr_inline_data, 565 raw_bytes) + record_length); 566 } 567 568 if (size >= record_length) { 569 memcpy(value, entry->inline_data.raw_bytes, record_length); 570 res = record_length; 571 } else 572 res = size ? -ERANGE : record_length; 573 574 out: 575 hfs_find_exit(&fd); 576 577 failed_getxattr_init: 578 hfsplus_destroy_attr_entry(entry); 579 return res; 580 } 581 582 ssize_t hfsplus_getxattr(struct dentry *dentry, const char *name, 583 void *value, size_t size, 584 const char *prefix, size_t prefixlen) 585 { 586 int res; 587 char *xattr_name; 588 589 xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1, 590 GFP_KERNEL); 591 if (!xattr_name) 592 return -ENOMEM; 593 594 strcpy(xattr_name, prefix); 595 strcpy(xattr_name + prefixlen, name); 596 597 res = __hfsplus_getxattr(d_inode(dentry), xattr_name, value, size); 598 kfree(xattr_name); 599 return res; 600 601 } 602 603 static inline int can_list(const char *xattr_name) 604 { 605 if (!xattr_name) 606 return 0; 607 608 return strncmp(xattr_name, XATTR_TRUSTED_PREFIX, 609 XATTR_TRUSTED_PREFIX_LEN) || 610 capable(CAP_SYS_ADMIN); 611 } 612 613 static ssize_t hfsplus_listxattr_finder_info(struct dentry *dentry, 614 char *buffer, size_t size) 615 { 616 ssize_t res = 0; 617 struct inode *inode = d_inode(dentry); 618 struct hfs_find_data fd; 619 u16 entry_type; 620 u8 folder_finder_info[sizeof(struct DInfo) + sizeof(struct DXInfo)]; 621 u8 file_finder_info[sizeof(struct FInfo) + sizeof(struct FXInfo)]; 622 unsigned long len, found_bit; 623 int xattr_name_len, symbols_count; 624 625 res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd); 626 if (res) { 627 pr_err("can't init xattr find struct\n"); 628 return res; 629 } 630 631 res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); 632 if (res) 633 goto end_listxattr_finder_info; 634 635 entry_type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset); 636 if (entry_type == HFSPLUS_FOLDER) { 637 len = sizeof(struct DInfo) + sizeof(struct DXInfo); 638 hfs_bnode_read(fd.bnode, folder_finder_info, 639 fd.entryoffset + 640 offsetof(struct hfsplus_cat_folder, user_info), 641 len); 642 found_bit = find_first_bit((void *)folder_finder_info, len*8); 643 } else if (entry_type == HFSPLUS_FILE) { 644 len = sizeof(struct FInfo) + sizeof(struct FXInfo); 645 hfs_bnode_read(fd.bnode, file_finder_info, 646 fd.entryoffset + 647 offsetof(struct hfsplus_cat_file, user_info), 648 len); 649 found_bit = find_first_bit((void *)file_finder_info, len*8); 650 } else { 651 res = -EOPNOTSUPP; 652 goto end_listxattr_finder_info; 653 } 654 655 if (found_bit >= (len*8)) 656 res = 0; 657 else { 658 symbols_count = sizeof(HFSPLUS_XATTR_FINDER_INFO_NAME) - 1; 659 xattr_name_len = 660 name_len(HFSPLUS_XATTR_FINDER_INFO_NAME, symbols_count); 661 if (!buffer || !size) { 662 if (can_list(HFSPLUS_XATTR_FINDER_INFO_NAME)) 663 res = xattr_name_len; 664 } else if (can_list(HFSPLUS_XATTR_FINDER_INFO_NAME)) { 665 if (size < xattr_name_len) 666 res = -ERANGE; 667 else { 668 res = copy_name(buffer, 669 HFSPLUS_XATTR_FINDER_INFO_NAME, 670 symbols_count); 671 } 672 } 673 } 674 675 end_listxattr_finder_info: 676 hfs_find_exit(&fd); 677 678 return res; 679 } 680 681 ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size) 682 { 683 ssize_t err; 684 ssize_t res = 0; 685 struct inode *inode = d_inode(dentry); 686 struct hfs_find_data fd; 687 u16 key_len = 0; 688 struct hfsplus_attr_key attr_key; 689 char *strbuf; 690 int xattr_name_len; 691 692 if ((!S_ISREG(inode->i_mode) && 693 !S_ISDIR(inode->i_mode)) || 694 HFSPLUS_IS_RSRC(inode)) 695 return -EOPNOTSUPP; 696 697 res = hfsplus_listxattr_finder_info(dentry, buffer, size); 698 if (res < 0) 699 return res; 700 else if (!HFSPLUS_SB(inode->i_sb)->attr_tree) 701 return (res == 0) ? -EOPNOTSUPP : res; 702 703 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->attr_tree, &fd); 704 if (err) { 705 pr_err("can't init xattr find struct\n"); 706 return err; 707 } 708 709 strbuf = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 710 XATTR_MAC_OSX_PREFIX_LEN + 1, GFP_KERNEL); 711 if (!strbuf) { 712 res = -ENOMEM; 713 goto out; 714 } 715 716 err = hfsplus_find_attr(inode->i_sb, inode->i_ino, NULL, &fd); 717 if (err) { 718 if (err == -ENOENT) { 719 if (res == 0) 720 res = -ENODATA; 721 goto end_listxattr; 722 } else { 723 res = err; 724 goto end_listxattr; 725 } 726 } 727 728 for (;;) { 729 key_len = hfs_bnode_read_u16(fd.bnode, fd.keyoffset); 730 if (key_len == 0 || key_len > fd.tree->max_key_len) { 731 pr_err("invalid xattr key length: %d\n", key_len); 732 res = -EIO; 733 goto end_listxattr; 734 } 735 736 hfs_bnode_read(fd.bnode, &attr_key, 737 fd.keyoffset, key_len + sizeof(key_len)); 738 739 if (be32_to_cpu(attr_key.cnid) != inode->i_ino) 740 goto end_listxattr; 741 742 xattr_name_len = NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN; 743 if (hfsplus_uni2asc(inode->i_sb, 744 (const struct hfsplus_unistr *)&fd.key->attr.key_name, 745 strbuf, &xattr_name_len)) { 746 pr_err("unicode conversion failed\n"); 747 res = -EIO; 748 goto end_listxattr; 749 } 750 751 if (!buffer || !size) { 752 if (can_list(strbuf)) 753 res += name_len(strbuf, xattr_name_len); 754 } else if (can_list(strbuf)) { 755 if (size < (res + name_len(strbuf, xattr_name_len))) { 756 res = -ERANGE; 757 goto end_listxattr; 758 } else 759 res += copy_name(buffer + res, 760 strbuf, xattr_name_len); 761 } 762 763 if (hfs_brec_goto(&fd, 1)) 764 goto end_listxattr; 765 } 766 767 end_listxattr: 768 kfree(strbuf); 769 out: 770 hfs_find_exit(&fd); 771 return res; 772 } 773 774 static int hfsplus_removexattr(struct inode *inode, const char *name) 775 { 776 int err = 0; 777 struct hfs_find_data cat_fd; 778 u16 flags; 779 u16 cat_entry_type; 780 int is_xattr_acl_deleted = 0; 781 int is_all_xattrs_deleted = 0; 782 783 if (!HFSPLUS_SB(inode->i_sb)->attr_tree) 784 return -EOPNOTSUPP; 785 786 if (!strcmp_xattr_finder_info(name)) 787 return -EOPNOTSUPP; 788 789 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd); 790 if (err) { 791 pr_err("can't init xattr find struct\n"); 792 return err; 793 } 794 795 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd); 796 if (err) { 797 pr_err("catalog searching failed\n"); 798 goto end_removexattr; 799 } 800 801 err = hfsplus_delete_attr(inode, name); 802 if (err) 803 goto end_removexattr; 804 805 is_xattr_acl_deleted = !strcmp_xattr_acl(name); 806 is_all_xattrs_deleted = !hfsplus_attr_exists(inode, NULL); 807 808 if (!is_xattr_acl_deleted && !is_all_xattrs_deleted) 809 goto end_removexattr; 810 811 cat_entry_type = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset); 812 813 if (cat_entry_type == HFSPLUS_FOLDER) { 814 flags = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset + 815 offsetof(struct hfsplus_cat_folder, flags)); 816 if (is_xattr_acl_deleted) 817 flags &= ~HFSPLUS_ACL_EXISTS; 818 if (is_all_xattrs_deleted) 819 flags &= ~HFSPLUS_XATTR_EXISTS; 820 hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset + 821 offsetof(struct hfsplus_cat_folder, flags), 822 flags); 823 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY); 824 } else if (cat_entry_type == HFSPLUS_FILE) { 825 flags = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset + 826 offsetof(struct hfsplus_cat_file, flags)); 827 if (is_xattr_acl_deleted) 828 flags &= ~HFSPLUS_ACL_EXISTS; 829 if (is_all_xattrs_deleted) 830 flags &= ~HFSPLUS_XATTR_EXISTS; 831 hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset + 832 offsetof(struct hfsplus_cat_file, flags), 833 flags); 834 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY); 835 } else { 836 pr_err("invalid catalog entry type\n"); 837 err = -EIO; 838 goto end_removexattr; 839 } 840 841 end_removexattr: 842 hfs_find_exit(&cat_fd); 843 return err; 844 } 845 846 static int hfsplus_osx_getxattr(const struct xattr_handler *handler, 847 struct dentry *dentry, const char *name, 848 void *buffer, size_t size) 849 { 850 /* 851 * Don't allow retrieving properly prefixed attributes 852 * by prepending them with "osx." 853 */ 854 if (is_known_namespace(name)) 855 return -EOPNOTSUPP; 856 857 /* 858 * osx is the namespace we use to indicate an unprefixed 859 * attribute on the filesystem (like the ones that OS X 860 * creates), so we pass the name through unmodified (after 861 * ensuring it doesn't conflict with another namespace). 862 */ 863 return __hfsplus_getxattr(d_inode(dentry), name, buffer, size); 864 } 865 866 static int hfsplus_osx_setxattr(const struct xattr_handler *handler, 867 struct dentry *dentry, const char *name, 868 const void *buffer, size_t size, int flags) 869 { 870 /* 871 * Don't allow setting properly prefixed attributes 872 * by prepending them with "osx." 873 */ 874 if (is_known_namespace(name)) 875 return -EOPNOTSUPP; 876 877 /* 878 * osx is the namespace we use to indicate an unprefixed 879 * attribute on the filesystem (like the ones that OS X 880 * creates), so we pass the name through unmodified (after 881 * ensuring it doesn't conflict with another namespace). 882 */ 883 return __hfsplus_setxattr(d_inode(dentry), name, buffer, size, flags); 884 } 885 886 const struct xattr_handler hfsplus_xattr_osx_handler = { 887 .prefix = XATTR_MAC_OSX_PREFIX, 888 .get = hfsplus_osx_getxattr, 889 .set = hfsplus_osx_setxattr, 890 }; 891