1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/fs/hfsplus/dir.c 4 * 5 * Copyright (C) 2001 6 * Brad Boyer (flar@allandria.com) 7 * (C) 2003 Ardis Technologies <roman@ardistech.com> 8 * 9 * Handling of directories 10 */ 11 12 #include <linux/errno.h> 13 #include <linux/fs.h> 14 #include <linux/slab.h> 15 #include <linux/random.h> 16 #include <linux/nls.h> 17 18 #include "hfsplus_fs.h" 19 #include "hfsplus_raw.h" 20 #include "xattr.h" 21 22 static inline void hfsplus_instantiate(struct dentry *dentry, 23 struct inode *inode, u32 cnid) 24 { 25 dentry->d_fsdata = (void *)(unsigned long)cnid; 26 d_instantiate(dentry, inode); 27 } 28 29 /* Find the entry inside dir named dentry->d_name */ 30 static struct dentry *hfsplus_lookup(struct inode *dir, struct dentry *dentry, 31 unsigned int flags) 32 { 33 struct inode *inode = NULL; 34 struct hfs_find_data fd; 35 struct super_block *sb; 36 hfsplus_cat_entry entry; 37 int err; 38 u32 cnid, linkid = 0; 39 u16 type; 40 41 sb = dir->i_sb; 42 43 dentry->d_fsdata = NULL; 44 err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd); 45 if (err) 46 return ERR_PTR(err); 47 err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, 48 &dentry->d_name); 49 if (unlikely(err < 0)) 50 goto fail; 51 again: 52 err = hfsplus_brec_read_cat(&fd, &entry); 53 if (err) { 54 if (err == -ENOENT) { 55 hfs_find_exit(&fd); 56 /* No such entry */ 57 inode = NULL; 58 goto out; 59 } 60 goto fail; 61 } 62 type = be16_to_cpu(entry.type); 63 if (type == HFSPLUS_FOLDER) { 64 if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) { 65 err = -EIO; 66 goto fail; 67 } 68 cnid = be32_to_cpu(entry.folder.id); 69 dentry->d_fsdata = (void *)(unsigned long)cnid; 70 } else if (type == HFSPLUS_FILE) { 71 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) { 72 err = -EIO; 73 goto fail; 74 } 75 cnid = be32_to_cpu(entry.file.id); 76 if (entry.file.user_info.fdType == 77 cpu_to_be32(HFSP_HARDLINK_TYPE) && 78 entry.file.user_info.fdCreator == 79 cpu_to_be32(HFSP_HFSPLUS_CREATOR) && 80 HFSPLUS_SB(sb)->hidden_dir && 81 (entry.file.create_date == 82 HFSPLUS_I(HFSPLUS_SB(sb)->hidden_dir)-> 83 create_date || 84 entry.file.create_date == 85 HFSPLUS_I(d_inode(sb->s_root))-> 86 create_date)) { 87 struct qstr str; 88 char name[32]; 89 90 if (dentry->d_fsdata) { 91 /* 92 * We found a link pointing to another link, 93 * so ignore it and treat it as regular file. 94 */ 95 cnid = (unsigned long)dentry->d_fsdata; 96 linkid = 0; 97 } else { 98 dentry->d_fsdata = (void *)(unsigned long)cnid; 99 linkid = 100 be32_to_cpu(entry.file.permissions.dev); 101 str.len = sprintf(name, "iNode%d", linkid); 102 str.name = name; 103 err = hfsplus_cat_build_key(sb, fd.search_key, 104 HFSPLUS_SB(sb)->hidden_dir->i_ino, 105 &str); 106 if (unlikely(err < 0)) 107 goto fail; 108 goto again; 109 } 110 } else if (!dentry->d_fsdata) 111 dentry->d_fsdata = (void *)(unsigned long)cnid; 112 } else { 113 pr_err("invalid catalog entry type in lookup\n"); 114 err = -EIO; 115 goto fail; 116 } 117 hfs_find_exit(&fd); 118 inode = hfsplus_iget(dir->i_sb, cnid); 119 if (IS_ERR(inode)) 120 return ERR_CAST(inode); 121 if (S_ISREG(inode->i_mode)) 122 HFSPLUS_I(inode)->linkid = linkid; 123 out: 124 return d_splice_alias(inode, dentry); 125 fail: 126 hfs_find_exit(&fd); 127 return ERR_PTR(err); 128 } 129 130 static int hfsplus_readdir(struct file *file, struct dir_context *ctx) 131 { 132 struct inode *inode = file_inode(file); 133 struct super_block *sb = inode->i_sb; 134 int len, err; 135 char *strbuf; 136 hfsplus_cat_entry entry; 137 struct hfs_find_data fd; 138 struct hfsplus_readdir_data *rd; 139 u16 type; 140 141 if (file->f_pos >= inode->i_size) 142 return 0; 143 144 err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd); 145 if (err) 146 return err; 147 strbuf = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_MAX_STRLEN + 1, GFP_KERNEL); 148 if (!strbuf) { 149 err = -ENOMEM; 150 goto out; 151 } 152 hfsplus_cat_build_key_with_cnid(sb, fd.search_key, inode->i_ino); 153 err = hfs_brec_find(&fd, hfs_find_rec_by_key); 154 if (err) 155 goto out; 156 157 if (ctx->pos == 0) { 158 /* This is completely artificial... */ 159 if (!dir_emit_dot(file, ctx)) 160 goto out; 161 ctx->pos = 1; 162 } 163 if (ctx->pos == 1) { 164 if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) { 165 err = -EIO; 166 goto out; 167 } 168 169 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 170 fd.entrylength); 171 if (be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) { 172 pr_err("bad catalog folder thread\n"); 173 err = -EIO; 174 goto out; 175 } 176 if (fd.entrylength < HFSPLUS_MIN_THREAD_SZ) { 177 pr_err("truncated catalog thread\n"); 178 err = -EIO; 179 goto out; 180 } 181 if (!dir_emit(ctx, "..", 2, 182 be32_to_cpu(entry.thread.parentID), DT_DIR)) 183 goto out; 184 ctx->pos = 2; 185 } 186 if (ctx->pos >= inode->i_size) 187 goto out; 188 rd = file->private_data; 189 if (rd && rd->pos == ctx->pos) { 190 memcpy(fd.search_key, &rd->key, sizeof(struct hfsplus_cat_key)); 191 err = hfs_brec_find(&fd, hfs_find_rec_by_key); 192 if (err == -ENOENT) 193 err = hfs_brec_goto(&fd, 1); 194 } else { 195 err = hfs_brec_goto(&fd, ctx->pos - 1); 196 } 197 if (err) 198 goto out; 199 for (;;) { 200 if (be32_to_cpu(fd.key->cat.parent) != inode->i_ino) { 201 pr_err("walked past end of dir\n"); 202 err = -EIO; 203 goto out; 204 } 205 206 if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) { 207 err = -EIO; 208 goto out; 209 } 210 211 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 212 fd.entrylength); 213 type = be16_to_cpu(entry.type); 214 len = NLS_MAX_CHARSET_SIZE * HFSPLUS_MAX_STRLEN; 215 err = hfsplus_uni2asc_str(sb, &fd.key->cat.name, strbuf, &len); 216 if (err) 217 goto out; 218 if (type == HFSPLUS_FOLDER) { 219 if (fd.entrylength < 220 sizeof(struct hfsplus_cat_folder)) { 221 pr_err("small dir entry\n"); 222 err = -EIO; 223 goto out; 224 } 225 if (HFSPLUS_SB(sb)->hidden_dir && 226 HFSPLUS_SB(sb)->hidden_dir->i_ino == 227 be32_to_cpu(entry.folder.id)) 228 goto next; 229 if (!dir_emit(ctx, strbuf, len, 230 be32_to_cpu(entry.folder.id), DT_DIR)) 231 break; 232 } else if (type == HFSPLUS_FILE) { 233 u16 mode; 234 unsigned type = DT_UNKNOWN; 235 236 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) { 237 pr_err("small file entry\n"); 238 err = -EIO; 239 goto out; 240 } 241 242 mode = be16_to_cpu(entry.file.permissions.mode); 243 if (S_ISREG(mode)) 244 type = DT_REG; 245 else if (S_ISLNK(mode)) 246 type = DT_LNK; 247 else if (S_ISFIFO(mode)) 248 type = DT_FIFO; 249 else if (S_ISCHR(mode)) 250 type = DT_CHR; 251 else if (S_ISBLK(mode)) 252 type = DT_BLK; 253 else if (S_ISSOCK(mode)) 254 type = DT_SOCK; 255 256 if (!dir_emit(ctx, strbuf, len, 257 be32_to_cpu(entry.file.id), type)) 258 break; 259 } else { 260 pr_err("bad catalog entry type\n"); 261 err = -EIO; 262 goto out; 263 } 264 next: 265 ctx->pos++; 266 if (ctx->pos >= inode->i_size) 267 goto out; 268 err = hfs_brec_goto(&fd, 1); 269 if (err) 270 goto out; 271 } 272 if (!rd) { 273 rd = kmalloc_obj(struct hfsplus_readdir_data); 274 if (!rd) { 275 err = -ENOMEM; 276 goto out; 277 } 278 file->private_data = rd; 279 } 280 rd->pos = ctx->pos; 281 memcpy(&rd->key, fd.key, sizeof(struct hfsplus_cat_key)); 282 out: 283 kfree(strbuf); 284 hfs_find_exit(&fd); 285 return err; 286 } 287 288 static int hfsplus_dir_release(struct inode *inode, struct file *file) 289 { 290 kfree(file->private_data); 291 return 0; 292 } 293 294 static int hfsplus_link(struct dentry *src_dentry, struct inode *dst_dir, 295 struct dentry *dst_dentry) 296 { 297 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dst_dir->i_sb); 298 struct inode *inode = d_inode(src_dentry); 299 struct inode *src_dir = d_inode(src_dentry->d_parent); 300 struct qstr str; 301 char name[32]; 302 u32 cnid, id; 303 int res; 304 305 if (HFSPLUS_IS_RSRC(inode)) 306 return -EPERM; 307 if (!S_ISREG(inode->i_mode)) 308 return -EPERM; 309 310 hfs_dbg("src_dir->i_ino %llu, dst_dir->i_ino %llu, inode->i_ino %llu\n", 311 src_dir->i_ino, dst_dir->i_ino, inode->i_ino); 312 313 mutex_lock(&sbi->vh_mutex); 314 if (inode->i_ino == (u32)(unsigned long)src_dentry->d_fsdata) { 315 for (;;) { 316 get_random_bytes(&id, sizeof(cnid)); 317 id &= 0x3fffffff; 318 str.name = name; 319 str.len = sprintf(name, "iNode%d", id); 320 res = hfsplus_rename_cat(inode->i_ino, 321 src_dir, &src_dentry->d_name, 322 sbi->hidden_dir, &str); 323 if (!res) 324 break; 325 if (res != -EEXIST) 326 goto out; 327 } 328 HFSPLUS_I(inode)->linkid = id; 329 cnid = sbi->next_cnid++; 330 src_dentry->d_fsdata = (void *)(unsigned long)cnid; 331 res = hfsplus_create_cat(cnid, src_dir, 332 &src_dentry->d_name, inode); 333 if (res) 334 /* panic? */ 335 goto out; 336 sbi->file_count++; 337 } 338 cnid = sbi->next_cnid++; 339 res = hfsplus_create_cat(cnid, dst_dir, &dst_dentry->d_name, inode); 340 if (res) 341 goto out; 342 343 inc_nlink(inode); 344 hfsplus_instantiate(dst_dentry, inode, cnid); 345 ihold(inode); 346 inode_set_ctime_current(inode); 347 mark_inode_dirty(inode); 348 sbi->file_count++; 349 hfsplus_mark_mdb_dirty(dst_dir->i_sb); 350 351 res = hfsplus_cat_write_inode(src_dir); 352 if (res) 353 goto out; 354 355 res = hfsplus_cat_write_inode(dst_dir); 356 if (res) 357 goto out; 358 359 res = hfsplus_cat_write_inode(sbi->hidden_dir); 360 if (res) 361 goto out; 362 363 res = hfsplus_cat_write_inode(inode); 364 365 out: 366 mutex_unlock(&sbi->vh_mutex); 367 return res; 368 } 369 370 static int hfsplus_unlink(struct inode *dir, struct dentry *dentry) 371 { 372 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb); 373 struct inode *inode = d_inode(dentry); 374 struct qstr str; 375 char name[32]; 376 u32 cnid; 377 int res; 378 379 if (HFSPLUS_IS_RSRC(inode)) 380 return -EPERM; 381 382 hfs_dbg("dir->i_ino %llu, inode->i_ino %llu\n", 383 dir->i_ino, inode->i_ino); 384 385 mutex_lock(&sbi->vh_mutex); 386 cnid = (u32)(unsigned long)dentry->d_fsdata; 387 if (inode->i_ino == cnid && 388 atomic_read(&HFSPLUS_I(inode)->opencnt)) { 389 str.name = name; 390 str.len = sprintf(name, "temp%llu", inode->i_ino); 391 res = hfsplus_rename_cat(inode->i_ino, 392 dir, &dentry->d_name, 393 sbi->hidden_dir, &str); 394 if (!res) { 395 inode->i_flags |= S_DEAD; 396 drop_nlink(inode); 397 } 398 goto out; 399 } 400 res = hfsplus_delete_cat(cnid, dir, &dentry->d_name); 401 if (res) 402 goto out; 403 404 if (inode->i_nlink > 0) 405 drop_nlink(inode); 406 if (inode->i_ino == cnid) 407 clear_nlink(inode); 408 if (!inode->i_nlink) { 409 if (inode->i_ino != cnid) { 410 sbi->file_count--; 411 if (!atomic_read(&HFSPLUS_I(inode)->opencnt)) { 412 res = hfsplus_delete_cat(inode->i_ino, 413 sbi->hidden_dir, 414 NULL); 415 if (!res) 416 hfsplus_delete_inode(inode); 417 } else 418 inode->i_flags |= S_DEAD; 419 } else 420 hfsplus_delete_inode(inode); 421 } else 422 sbi->file_count--; 423 inode_set_ctime_current(inode); 424 mark_inode_dirty(inode); 425 out: 426 if (!res) { 427 res = hfsplus_cat_write_inode(dir); 428 if (!res) { 429 res = hfsplus_cat_write_inode(sbi->hidden_dir); 430 if (!res) 431 res = hfsplus_cat_write_inode(inode); 432 } 433 } 434 435 mutex_unlock(&sbi->vh_mutex); 436 return res; 437 } 438 439 static int hfsplus_rmdir(struct inode *dir, struct dentry *dentry) 440 { 441 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb); 442 struct inode *inode = d_inode(dentry); 443 int res; 444 445 if (inode->i_size != 2) 446 return -ENOTEMPTY; 447 448 mutex_lock(&sbi->vh_mutex); 449 res = hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name); 450 if (res) 451 goto out; 452 clear_nlink(inode); 453 inode_set_ctime_current(inode); 454 hfsplus_delete_inode(inode); 455 mark_inode_dirty(inode); 456 457 res = hfsplus_cat_write_inode(dir); 458 out: 459 mutex_unlock(&sbi->vh_mutex); 460 return res; 461 } 462 463 static int hfsplus_symlink(struct mnt_idmap *idmap, struct inode *dir, 464 struct dentry *dentry, const char *symname) 465 { 466 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb); 467 struct inode *inode; 468 int res = -ENOMEM; 469 470 mutex_lock(&sbi->vh_mutex); 471 inode = hfsplus_new_inode(dir->i_sb, dir, S_IFLNK | S_IRWXUGO); 472 if (!inode) 473 goto out; 474 475 hfs_dbg("dir->i_ino %llu, inode->i_ino %llu\n", 476 dir->i_ino, inode->i_ino); 477 478 res = page_symlink(inode, symname, strlen(symname) + 1); 479 if (res) 480 goto out_err; 481 482 res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode); 483 if (res) 484 goto out_err; 485 486 res = hfsplus_init_security(inode, dir, &dentry->d_name); 487 if (res == -EOPNOTSUPP) 488 res = 0; /* Operation is not supported. */ 489 else if (res) { 490 /* Try to delete anyway without error analysis. */ 491 hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name); 492 goto out_err; 493 } 494 495 hfsplus_instantiate(dentry, inode, inode->i_ino); 496 mark_inode_dirty(inode); 497 498 res = hfsplus_cat_write_inode(dir); 499 if (res) 500 goto out; 501 502 res = hfsplus_cat_write_inode(inode); 503 goto out; 504 505 out_err: 506 clear_nlink(inode); 507 hfsplus_delete_inode(inode); 508 iput(inode); 509 out: 510 mutex_unlock(&sbi->vh_mutex); 511 return res; 512 } 513 514 static int hfsplus_mknod(struct mnt_idmap *idmap, struct inode *dir, 515 struct dentry *dentry, umode_t mode, dev_t rdev) 516 { 517 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb); 518 struct inode *inode; 519 int res = -ENOMEM; 520 521 mutex_lock(&sbi->vh_mutex); 522 inode = hfsplus_new_inode(dir->i_sb, dir, mode); 523 if (!inode) 524 goto out; 525 526 hfs_dbg("dir->i_ino %llu, inode->i_ino %llu\n", 527 dir->i_ino, inode->i_ino); 528 529 if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) 530 init_special_inode(inode, mode, rdev); 531 532 res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode); 533 if (res) 534 goto failed_mknod; 535 536 res = hfsplus_init_security(inode, dir, &dentry->d_name); 537 if (res == -EOPNOTSUPP) 538 res = 0; /* Operation is not supported. */ 539 else if (res) { 540 /* Try to delete anyway without error analysis. */ 541 hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name); 542 goto failed_mknod; 543 } 544 545 hfsplus_instantiate(dentry, inode, inode->i_ino); 546 mark_inode_dirty(inode); 547 548 res = hfsplus_cat_write_inode(dir); 549 if (res) 550 goto out; 551 552 res = hfsplus_cat_write_inode(inode); 553 goto out; 554 555 failed_mknod: 556 clear_nlink(inode); 557 hfsplus_delete_inode(inode); 558 iput(inode); 559 out: 560 mutex_unlock(&sbi->vh_mutex); 561 return res; 562 } 563 564 static int hfsplus_create(struct mnt_idmap *idmap, struct inode *dir, 565 struct dentry *dentry, umode_t mode, bool excl) 566 { 567 return hfsplus_mknod(&nop_mnt_idmap, dir, dentry, mode, 0); 568 } 569 570 static struct dentry *hfsplus_mkdir(struct mnt_idmap *idmap, struct inode *dir, 571 struct dentry *dentry, umode_t mode) 572 { 573 return ERR_PTR(hfsplus_mknod(&nop_mnt_idmap, dir, dentry, mode | S_IFDIR, 0)); 574 } 575 576 static int hfsplus_rename(struct mnt_idmap *idmap, 577 struct inode *old_dir, struct dentry *old_dentry, 578 struct inode *new_dir, struct dentry *new_dentry, 579 unsigned int flags) 580 { 581 int res; 582 583 if (flags & ~RENAME_NOREPLACE) 584 return -EINVAL; 585 586 /* Unlink destination if it already exists */ 587 if (d_really_is_positive(new_dentry)) { 588 if (d_is_dir(new_dentry)) 589 res = hfsplus_rmdir(new_dir, new_dentry); 590 else 591 res = hfsplus_unlink(new_dir, new_dentry); 592 if (res) 593 return res; 594 } 595 596 res = hfsplus_rename_cat((u32)(unsigned long)old_dentry->d_fsdata, 597 old_dir, &old_dentry->d_name, 598 new_dir, &new_dentry->d_name); 599 if (!res) { 600 struct inode *inode = d_inode(old_dentry); 601 602 new_dentry->d_fsdata = old_dentry->d_fsdata; 603 604 inode_set_ctime_current(inode); 605 mark_inode_dirty(inode); 606 607 res = hfsplus_cat_write_inode(old_dir); 608 if (res) 609 return res; 610 611 res = hfsplus_cat_write_inode(new_dir); 612 if (res) 613 return res; 614 615 res = hfsplus_cat_write_inode(inode); 616 } 617 return res; 618 } 619 620 const struct inode_operations hfsplus_dir_inode_operations = { 621 .lookup = hfsplus_lookup, 622 .create = hfsplus_create, 623 .link = hfsplus_link, 624 .unlink = hfsplus_unlink, 625 .mkdir = hfsplus_mkdir, 626 .rmdir = hfsplus_rmdir, 627 .symlink = hfsplus_symlink, 628 .mknod = hfsplus_mknod, 629 .rename = hfsplus_rename, 630 .getattr = hfsplus_getattr, 631 .listxattr = hfsplus_listxattr, 632 .fileattr_get = hfsplus_fileattr_get, 633 .fileattr_set = hfsplus_fileattr_set, 634 }; 635 636 const struct file_operations hfsplus_dir_operations = { 637 .fsync = hfsplus_file_fsync, 638 .read = generic_read_dir, 639 .iterate_shared = hfsplus_readdir, 640 .unlocked_ioctl = hfsplus_ioctl, 641 .llseek = generic_file_llseek, 642 .release = hfsplus_dir_release, 643 }; 644