1 /* 2 * linux/fs/hfsplus/catalog.c 3 * 4 * Copyright (C) 2001 5 * Brad Boyer (flar@allandria.com) 6 * (C) 2003 Ardis Technologies <roman@ardistech.com> 7 * 8 * Handling of catalog records 9 */ 10 11 12 #include "hfsplus_fs.h" 13 #include "hfsplus_raw.h" 14 15 int hfsplus_cat_case_cmp_key(const hfsplus_btree_key *k1, 16 const hfsplus_btree_key *k2) 17 { 18 __be32 k1p, k2p; 19 20 k1p = k1->cat.parent; 21 k2p = k2->cat.parent; 22 if (k1p != k2p) 23 return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1; 24 25 return hfsplus_strcasecmp(&k1->cat.name, &k2->cat.name); 26 } 27 28 int hfsplus_cat_bin_cmp_key(const hfsplus_btree_key *k1, 29 const hfsplus_btree_key *k2) 30 { 31 __be32 k1p, k2p; 32 33 k1p = k1->cat.parent; 34 k2p = k2->cat.parent; 35 if (k1p != k2p) 36 return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1; 37 38 return hfsplus_strcmp(&k1->cat.name, &k2->cat.name); 39 } 40 41 /* Generates key for catalog file/folders record. */ 42 int hfsplus_cat_build_key(struct super_block *sb, 43 hfsplus_btree_key *key, u32 parent, const struct qstr *str) 44 { 45 int len, err; 46 47 key->cat.parent = cpu_to_be32(parent); 48 err = hfsplus_asc2uni(sb, &key->cat.name, HFSPLUS_MAX_STRLEN, 49 str->name, str->len); 50 if (unlikely(err < 0)) 51 return err; 52 53 len = be16_to_cpu(key->cat.name.length); 54 key->key_len = cpu_to_be16(6 + 2 * len); 55 return 0; 56 } 57 58 /* Generates key for catalog thread record. */ 59 void hfsplus_cat_build_key_with_cnid(struct super_block *sb, 60 hfsplus_btree_key *key, u32 parent) 61 { 62 key->cat.parent = cpu_to_be32(parent); 63 key->cat.name.length = 0; 64 key->key_len = cpu_to_be16(6); 65 } 66 67 static void hfsplus_cat_build_key_uni(hfsplus_btree_key *key, u32 parent, 68 struct hfsplus_unistr *name) 69 { 70 int ustrlen; 71 72 ustrlen = be16_to_cpu(name->length); 73 key->cat.parent = cpu_to_be32(parent); 74 key->cat.name.length = cpu_to_be16(ustrlen); 75 ustrlen *= 2; 76 memcpy(key->cat.name.unicode, name->unicode, ustrlen); 77 key->key_len = cpu_to_be16(6 + ustrlen); 78 } 79 80 void hfsplus_cat_set_perms(struct inode *inode, struct hfsplus_perm *perms) 81 { 82 if (inode->i_flags & S_IMMUTABLE) 83 perms->rootflags |= HFSPLUS_FLG_IMMUTABLE; 84 else 85 perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE; 86 if (inode->i_flags & S_APPEND) 87 perms->rootflags |= HFSPLUS_FLG_APPEND; 88 else 89 perms->rootflags &= ~HFSPLUS_FLG_APPEND; 90 91 perms->userflags = HFSPLUS_I(inode)->userflags; 92 perms->mode = cpu_to_be16(inode->i_mode); 93 perms->owner = cpu_to_be32(i_uid_read(inode)); 94 perms->group = cpu_to_be32(i_gid_read(inode)); 95 96 if (S_ISREG(inode->i_mode)) 97 perms->dev = cpu_to_be32(inode->i_nlink); 98 else if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) 99 perms->dev = cpu_to_be32(inode->i_rdev); 100 else 101 perms->dev = 0; 102 } 103 104 static int hfsplus_cat_build_record(hfsplus_cat_entry *entry, 105 u32 cnid, struct inode *inode) 106 { 107 struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb); 108 109 if (S_ISDIR(inode->i_mode)) { 110 struct hfsplus_cat_folder *folder; 111 112 folder = &entry->folder; 113 memset(folder, 0, sizeof(*folder)); 114 folder->type = cpu_to_be16(HFSPLUS_FOLDER); 115 if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags)) 116 folder->flags |= cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT); 117 folder->id = cpu_to_be32(inode->i_ino); 118 HFSPLUS_I(inode)->create_date = 119 folder->create_date = 120 folder->content_mod_date = 121 folder->attribute_mod_date = 122 folder->access_date = hfsp_now2mt(); 123 hfsplus_cat_set_perms(inode, &folder->permissions); 124 if (inode == sbi->hidden_dir) 125 /* invisible and namelocked */ 126 folder->user_info.frFlags = cpu_to_be16(0x5000); 127 return sizeof(*folder); 128 } else { 129 struct hfsplus_cat_file *file; 130 131 file = &entry->file; 132 memset(file, 0, sizeof(*file)); 133 file->type = cpu_to_be16(HFSPLUS_FILE); 134 file->flags = cpu_to_be16(HFSPLUS_FILE_THREAD_EXISTS); 135 file->id = cpu_to_be32(cnid); 136 HFSPLUS_I(inode)->create_date = 137 file->create_date = 138 file->content_mod_date = 139 file->attribute_mod_date = 140 file->access_date = hfsp_now2mt(); 141 if (cnid == inode->i_ino) { 142 hfsplus_cat_set_perms(inode, &file->permissions); 143 if (S_ISLNK(inode->i_mode)) { 144 file->user_info.fdType = 145 cpu_to_be32(HFSP_SYMLINK_TYPE); 146 file->user_info.fdCreator = 147 cpu_to_be32(HFSP_SYMLINK_CREATOR); 148 } else { 149 file->user_info.fdType = 150 cpu_to_be32(sbi->type); 151 file->user_info.fdCreator = 152 cpu_to_be32(sbi->creator); 153 } 154 if (HFSPLUS_FLG_IMMUTABLE & 155 (file->permissions.rootflags | 156 file->permissions.userflags)) 157 file->flags |= 158 cpu_to_be16(HFSPLUS_FILE_LOCKED); 159 } else { 160 file->user_info.fdType = 161 cpu_to_be32(HFSP_HARDLINK_TYPE); 162 file->user_info.fdCreator = 163 cpu_to_be32(HFSP_HFSPLUS_CREATOR); 164 file->user_info.fdFlags = 165 cpu_to_be16(0x100); 166 file->create_date = 167 HFSPLUS_I(sbi->hidden_dir)->create_date; 168 file->permissions.dev = 169 cpu_to_be32(HFSPLUS_I(inode)->linkid); 170 } 171 return sizeof(*file); 172 } 173 } 174 175 static int hfsplus_fill_cat_thread(struct super_block *sb, 176 hfsplus_cat_entry *entry, int type, 177 u32 parentid, const struct qstr *str) 178 { 179 int err; 180 181 entry->type = cpu_to_be16(type); 182 entry->thread.reserved = 0; 183 entry->thread.parentID = cpu_to_be32(parentid); 184 err = hfsplus_asc2uni(sb, &entry->thread.nodeName, HFSPLUS_MAX_STRLEN, 185 str->name, str->len); 186 if (unlikely(err < 0)) 187 return err; 188 189 return 10 + be16_to_cpu(entry->thread.nodeName.length) * 2; 190 } 191 192 /* Try to get a catalog entry for given catalog id */ 193 int hfsplus_find_cat(struct super_block *sb, u32 cnid, 194 struct hfs_find_data *fd) 195 { 196 hfsplus_cat_entry tmp; 197 int err; 198 u16 type; 199 200 hfsplus_cat_build_key_with_cnid(sb, fd->search_key, cnid); 201 err = hfs_brec_read(fd, &tmp, sizeof(hfsplus_cat_entry)); 202 if (err) 203 return err; 204 205 type = be16_to_cpu(tmp.type); 206 if (type != HFSPLUS_FOLDER_THREAD && type != HFSPLUS_FILE_THREAD) { 207 pr_err("found bad thread record in catalog\n"); 208 return -EIO; 209 } 210 211 if (be16_to_cpu(tmp.thread.nodeName.length) > 255) { 212 pr_err("catalog name length corrupted\n"); 213 return -EIO; 214 } 215 216 hfsplus_cat_build_key_uni(fd->search_key, 217 be32_to_cpu(tmp.thread.parentID), 218 &tmp.thread.nodeName); 219 return hfs_brec_find(fd, hfs_find_rec_by_key); 220 } 221 222 static void hfsplus_subfolders_inc(struct inode *dir) 223 { 224 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb); 225 226 if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags)) { 227 /* 228 * Increment subfolder count. Note, the value is only meaningful 229 * for folders with HFSPLUS_HAS_FOLDER_COUNT flag set. 230 */ 231 HFSPLUS_I(dir)->subfolders++; 232 } 233 } 234 235 static void hfsplus_subfolders_dec(struct inode *dir) 236 { 237 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb); 238 239 if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags)) { 240 /* 241 * Decrement subfolder count. Note, the value is only meaningful 242 * for folders with HFSPLUS_HAS_FOLDER_COUNT flag set. 243 * 244 * Check for zero. Some subfolders may have been created 245 * by an implementation ignorant of this counter. 246 */ 247 if (HFSPLUS_I(dir)->subfolders) 248 HFSPLUS_I(dir)->subfolders--; 249 } 250 } 251 252 int hfsplus_create_cat(u32 cnid, struct inode *dir, 253 const struct qstr *str, struct inode *inode) 254 { 255 struct super_block *sb = dir->i_sb; 256 struct hfs_find_data fd; 257 hfsplus_cat_entry entry; 258 int entry_size; 259 int err; 260 261 hfs_dbg(CAT_MOD, "create_cat: %s,%u(%d)\n", 262 str->name, cnid, inode->i_nlink); 263 err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd); 264 if (err) 265 return err; 266 267 hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid); 268 entry_size = hfsplus_fill_cat_thread(sb, &entry, 269 S_ISDIR(inode->i_mode) ? 270 HFSPLUS_FOLDER_THREAD : HFSPLUS_FILE_THREAD, 271 dir->i_ino, str); 272 if (unlikely(entry_size < 0)) { 273 err = entry_size; 274 goto err2; 275 } 276 277 err = hfs_brec_find(&fd, hfs_find_rec_by_key); 278 if (err != -ENOENT) { 279 if (!err) 280 err = -EEXIST; 281 goto err2; 282 } 283 err = hfs_brec_insert(&fd, &entry, entry_size); 284 if (err) 285 goto err2; 286 287 err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str); 288 if (unlikely(err)) 289 goto err1; 290 291 entry_size = hfsplus_cat_build_record(&entry, cnid, inode); 292 err = hfs_brec_find(&fd, hfs_find_rec_by_key); 293 if (err != -ENOENT) { 294 /* panic? */ 295 if (!err) 296 err = -EEXIST; 297 goto err1; 298 } 299 err = hfs_brec_insert(&fd, &entry, entry_size); 300 if (err) 301 goto err1; 302 303 dir->i_size++; 304 if (S_ISDIR(inode->i_mode)) 305 hfsplus_subfolders_inc(dir); 306 dir->i_mtime = dir->i_ctime = current_time(dir); 307 hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY); 308 309 hfs_find_exit(&fd); 310 return 0; 311 312 err1: 313 hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid); 314 if (!hfs_brec_find(&fd, hfs_find_rec_by_key)) 315 hfs_brec_remove(&fd); 316 err2: 317 hfs_find_exit(&fd); 318 return err; 319 } 320 321 int hfsplus_delete_cat(u32 cnid, struct inode *dir, const struct qstr *str) 322 { 323 struct super_block *sb = dir->i_sb; 324 struct hfs_find_data fd; 325 struct hfsplus_fork_raw fork; 326 struct list_head *pos; 327 int err, off; 328 u16 type; 329 330 hfs_dbg(CAT_MOD, "delete_cat: %s,%u\n", str ? str->name : NULL, cnid); 331 err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd); 332 if (err) 333 return err; 334 335 if (!str) { 336 int len; 337 338 hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid); 339 err = hfs_brec_find(&fd, hfs_find_rec_by_key); 340 if (err) 341 goto out; 342 343 off = fd.entryoffset + 344 offsetof(struct hfsplus_cat_thread, nodeName); 345 fd.search_key->cat.parent = cpu_to_be32(dir->i_ino); 346 hfs_bnode_read(fd.bnode, 347 &fd.search_key->cat.name.length, off, 2); 348 len = be16_to_cpu(fd.search_key->cat.name.length) * 2; 349 hfs_bnode_read(fd.bnode, 350 &fd.search_key->cat.name.unicode, 351 off + 2, len); 352 fd.search_key->key_len = cpu_to_be16(6 + len); 353 } else { 354 err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str); 355 if (unlikely(err)) 356 goto out; 357 } 358 359 err = hfs_brec_find(&fd, hfs_find_rec_by_key); 360 if (err) 361 goto out; 362 363 type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset); 364 if (type == HFSPLUS_FILE) { 365 #if 0 366 off = fd.entryoffset + offsetof(hfsplus_cat_file, data_fork); 367 hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork)); 368 hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_DATA); 369 #endif 370 371 off = fd.entryoffset + 372 offsetof(struct hfsplus_cat_file, rsrc_fork); 373 hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork)); 374 hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_RSRC); 375 } 376 377 /* we only need to take spinlock for exclusion with ->release() */ 378 spin_lock(&HFSPLUS_I(dir)->open_dir_lock); 379 list_for_each(pos, &HFSPLUS_I(dir)->open_dir_list) { 380 struct hfsplus_readdir_data *rd = 381 list_entry(pos, struct hfsplus_readdir_data, list); 382 if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0) 383 rd->file->f_pos--; 384 } 385 spin_unlock(&HFSPLUS_I(dir)->open_dir_lock); 386 387 err = hfs_brec_remove(&fd); 388 if (err) 389 goto out; 390 391 hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid); 392 err = hfs_brec_find(&fd, hfs_find_rec_by_key); 393 if (err) 394 goto out; 395 396 err = hfs_brec_remove(&fd); 397 if (err) 398 goto out; 399 400 dir->i_size--; 401 if (type == HFSPLUS_FOLDER) 402 hfsplus_subfolders_dec(dir); 403 dir->i_mtime = dir->i_ctime = current_time(dir); 404 hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY); 405 406 if (type == HFSPLUS_FILE || type == HFSPLUS_FOLDER) { 407 if (HFSPLUS_SB(sb)->attr_tree) 408 hfsplus_delete_all_attrs(dir, cnid); 409 } 410 411 out: 412 hfs_find_exit(&fd); 413 414 return err; 415 } 416 417 int hfsplus_rename_cat(u32 cnid, 418 struct inode *src_dir, const struct qstr *src_name, 419 struct inode *dst_dir, const struct qstr *dst_name) 420 { 421 struct super_block *sb = src_dir->i_sb; 422 struct hfs_find_data src_fd, dst_fd; 423 hfsplus_cat_entry entry; 424 int entry_size, type; 425 int err; 426 427 hfs_dbg(CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n", 428 cnid, src_dir->i_ino, src_name->name, 429 dst_dir->i_ino, dst_name->name); 430 err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &src_fd); 431 if (err) 432 return err; 433 dst_fd = src_fd; 434 435 /* find the old dir entry and read the data */ 436 err = hfsplus_cat_build_key(sb, src_fd.search_key, 437 src_dir->i_ino, src_name); 438 if (unlikely(err)) 439 goto out; 440 441 err = hfs_brec_find(&src_fd, hfs_find_rec_by_key); 442 if (err) 443 goto out; 444 if (src_fd.entrylength > sizeof(entry) || src_fd.entrylength < 0) { 445 err = -EIO; 446 goto out; 447 } 448 449 hfs_bnode_read(src_fd.bnode, &entry, src_fd.entryoffset, 450 src_fd.entrylength); 451 type = be16_to_cpu(entry.type); 452 453 /* create new dir entry with the data from the old entry */ 454 err = hfsplus_cat_build_key(sb, dst_fd.search_key, 455 dst_dir->i_ino, dst_name); 456 if (unlikely(err)) 457 goto out; 458 459 err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key); 460 if (err != -ENOENT) { 461 if (!err) 462 err = -EEXIST; 463 goto out; 464 } 465 466 err = hfs_brec_insert(&dst_fd, &entry, src_fd.entrylength); 467 if (err) 468 goto out; 469 dst_dir->i_size++; 470 if (type == HFSPLUS_FOLDER) 471 hfsplus_subfolders_inc(dst_dir); 472 dst_dir->i_mtime = dst_dir->i_ctime = current_time(dst_dir); 473 474 /* finally remove the old entry */ 475 err = hfsplus_cat_build_key(sb, src_fd.search_key, 476 src_dir->i_ino, src_name); 477 if (unlikely(err)) 478 goto out; 479 480 err = hfs_brec_find(&src_fd, hfs_find_rec_by_key); 481 if (err) 482 goto out; 483 err = hfs_brec_remove(&src_fd); 484 if (err) 485 goto out; 486 src_dir->i_size--; 487 if (type == HFSPLUS_FOLDER) 488 hfsplus_subfolders_dec(src_dir); 489 src_dir->i_mtime = src_dir->i_ctime = current_time(src_dir); 490 491 /* remove old thread entry */ 492 hfsplus_cat_build_key_with_cnid(sb, src_fd.search_key, cnid); 493 err = hfs_brec_find(&src_fd, hfs_find_rec_by_key); 494 if (err) 495 goto out; 496 type = hfs_bnode_read_u16(src_fd.bnode, src_fd.entryoffset); 497 err = hfs_brec_remove(&src_fd); 498 if (err) 499 goto out; 500 501 /* create new thread entry */ 502 hfsplus_cat_build_key_with_cnid(sb, dst_fd.search_key, cnid); 503 entry_size = hfsplus_fill_cat_thread(sb, &entry, type, 504 dst_dir->i_ino, dst_name); 505 if (unlikely(entry_size < 0)) { 506 err = entry_size; 507 goto out; 508 } 509 510 err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key); 511 if (err != -ENOENT) { 512 if (!err) 513 err = -EEXIST; 514 goto out; 515 } 516 err = hfs_brec_insert(&dst_fd, &entry, entry_size); 517 518 hfsplus_mark_inode_dirty(dst_dir, HFSPLUS_I_CAT_DIRTY); 519 hfsplus_mark_inode_dirty(src_dir, HFSPLUS_I_CAT_DIRTY); 520 out: 521 hfs_bnode_put(dst_fd.bnode); 522 hfs_find_exit(&src_fd); 523 return err; 524 } 525