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 #include "acl.h" 22 23 static inline void hfsplus_instantiate(struct dentry *dentry, 24 struct inode *inode, u32 cnid) 25 { 26 dentry->d_fsdata = (void *)(unsigned long)cnid; 27 d_instantiate(dentry, inode); 28 } 29 30 /* Find the entry inside dir named dentry->d_name */ 31 static struct dentry *hfsplus_lookup(struct inode *dir, struct dentry *dentry, 32 unsigned int flags) 33 { 34 struct inode *inode = NULL; 35 struct hfs_find_data fd; 36 struct super_block *sb; 37 hfsplus_cat_entry entry; 38 int err; 39 u32 cnid, linkid = 0; 40 u16 type; 41 42 sb = dir->i_sb; 43 44 dentry->d_fsdata = NULL; 45 err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd); 46 if (err) 47 return ERR_PTR(err); 48 err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, 49 &dentry->d_name); 50 if (unlikely(err < 0)) 51 goto fail; 52 again: 53 err = hfs_brec_read(&fd, &entry, sizeof(entry)); 54 if (err) { 55 if (err == -ENOENT) { 56 hfs_find_exit(&fd); 57 /* No such entry */ 58 inode = NULL; 59 goto out; 60 } 61 goto fail; 62 } 63 type = be16_to_cpu(entry.type); 64 if (type == HFSPLUS_FOLDER) { 65 if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) { 66 err = -EIO; 67 goto fail; 68 } 69 cnid = be32_to_cpu(entry.folder.id); 70 dentry->d_fsdata = (void *)(unsigned long)cnid; 71 } else if (type == HFSPLUS_FILE) { 72 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) { 73 err = -EIO; 74 goto fail; 75 } 76 cnid = be32_to_cpu(entry.file.id); 77 if (entry.file.user_info.fdType == 78 cpu_to_be32(HFSP_HARDLINK_TYPE) && 79 entry.file.user_info.fdCreator == 80 cpu_to_be32(HFSP_HFSPLUS_CREATOR) && 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 HFSPLUS_SB(sb)->hidden_dir) { 88 struct qstr str; 89 char name[32]; 90 91 if (dentry->d_fsdata) { 92 /* 93 * We found a link pointing to another link, 94 * so ignore it and treat it as regular file. 95 */ 96 cnid = (unsigned long)dentry->d_fsdata; 97 linkid = 0; 98 } else { 99 dentry->d_fsdata = (void *)(unsigned long)cnid; 100 linkid = 101 be32_to_cpu(entry.file.permissions.dev); 102 str.len = sprintf(name, "iNode%d", linkid); 103 str.name = name; 104 err = hfsplus_cat_build_key(sb, fd.search_key, 105 HFSPLUS_SB(sb)->hidden_dir->i_ino, 106 &str); 107 if (unlikely(err < 0)) 108 goto fail; 109 goto again; 110 } 111 } else if (!dentry->d_fsdata) 112 dentry->d_fsdata = (void *)(unsigned long)cnid; 113 } else { 114 pr_err("invalid catalog entry type in lookup\n"); 115 err = -EIO; 116 goto fail; 117 } 118 hfs_find_exit(&fd); 119 inode = hfsplus_iget(dir->i_sb, cnid); 120 if (IS_ERR(inode)) 121 return ERR_CAST(inode); 122 if (S_ISREG(inode->i_mode)) 123 HFSPLUS_I(inode)->linkid = linkid; 124 out: 125 return d_splice_alias(inode, dentry); 126 fail: 127 hfs_find_exit(&fd); 128 return ERR_PTR(err); 129 } 130 131 static int hfsplus_readdir(struct file *file, struct dir_context *ctx) 132 { 133 struct inode *inode = file_inode(file); 134 struct super_block *sb = inode->i_sb; 135 int len, err; 136 char *strbuf; 137 hfsplus_cat_entry entry; 138 struct hfs_find_data fd; 139 struct hfsplus_readdir_data *rd; 140 u16 type; 141 142 if (file->f_pos >= inode->i_size) 143 return 0; 144 145 err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd); 146 if (err) 147 return err; 148 strbuf = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_MAX_STRLEN + 1, GFP_KERNEL); 149 if (!strbuf) { 150 err = -ENOMEM; 151 goto out; 152 } 153 hfsplus_cat_build_key_with_cnid(sb, fd.search_key, inode->i_ino); 154 err = hfs_brec_find(&fd, hfs_find_rec_by_key); 155 if (err) 156 goto out; 157 158 if (ctx->pos == 0) { 159 /* This is completely artificial... */ 160 if (!dir_emit_dot(file, ctx)) 161 goto out; 162 ctx->pos = 1; 163 } 164 if (ctx->pos == 1) { 165 if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) { 166 err = -EIO; 167 goto out; 168 } 169 170 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 171 fd.entrylength); 172 if (be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) { 173 pr_err("bad catalog folder thread\n"); 174 err = -EIO; 175 goto out; 176 } 177 if (fd.entrylength < HFSPLUS_MIN_THREAD_SZ) { 178 pr_err("truncated catalog thread\n"); 179 err = -EIO; 180 goto out; 181 } 182 if (!dir_emit(ctx, "..", 2, 183 be32_to_cpu(entry.thread.parentID), DT_DIR)) 184 goto out; 185 ctx->pos = 2; 186 } 187 if (ctx->pos >= inode->i_size) 188 goto out; 189 err = hfs_brec_goto(&fd, ctx->pos - 1); 190 if (err) 191 goto out; 192 for (;;) { 193 if (be32_to_cpu(fd.key->cat.parent) != inode->i_ino) { 194 pr_err("walked past end of dir\n"); 195 err = -EIO; 196 goto out; 197 } 198 199 if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) { 200 err = -EIO; 201 goto out; 202 } 203 204 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 205 fd.entrylength); 206 type = be16_to_cpu(entry.type); 207 len = NLS_MAX_CHARSET_SIZE * HFSPLUS_MAX_STRLEN; 208 err = hfsplus_uni2asc(sb, &fd.key->cat.name, strbuf, &len); 209 if (err) 210 goto out; 211 if (type == HFSPLUS_FOLDER) { 212 if (fd.entrylength < 213 sizeof(struct hfsplus_cat_folder)) { 214 pr_err("small dir entry\n"); 215 err = -EIO; 216 goto out; 217 } 218 if (HFSPLUS_SB(sb)->hidden_dir && 219 HFSPLUS_SB(sb)->hidden_dir->i_ino == 220 be32_to_cpu(entry.folder.id)) 221 goto next; 222 if (!dir_emit(ctx, strbuf, len, 223 be32_to_cpu(entry.folder.id), DT_DIR)) 224 break; 225 } else if (type == HFSPLUS_FILE) { 226 u16 mode; 227 unsigned type = DT_UNKNOWN; 228 229 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) { 230 pr_err("small file entry\n"); 231 err = -EIO; 232 goto out; 233 } 234 235 mode = be16_to_cpu(entry.file.permissions.mode); 236 if (S_ISREG(mode)) 237 type = DT_REG; 238 else if (S_ISLNK(mode)) 239 type = DT_LNK; 240 else if (S_ISFIFO(mode)) 241 type = DT_FIFO; 242 else if (S_ISCHR(mode)) 243 type = DT_CHR; 244 else if (S_ISBLK(mode)) 245 type = DT_BLK; 246 else if (S_ISSOCK(mode)) 247 type = DT_SOCK; 248 249 if (!dir_emit(ctx, strbuf, len, 250 be32_to_cpu(entry.file.id), type)) 251 break; 252 } else { 253 pr_err("bad catalog entry type\n"); 254 err = -EIO; 255 goto out; 256 } 257 next: 258 ctx->pos++; 259 if (ctx->pos >= inode->i_size) 260 goto out; 261 err = hfs_brec_goto(&fd, 1); 262 if (err) 263 goto out; 264 } 265 rd = file->private_data; 266 if (!rd) { 267 rd = kmalloc(sizeof(struct hfsplus_readdir_data), GFP_KERNEL); 268 if (!rd) { 269 err = -ENOMEM; 270 goto out; 271 } 272 file->private_data = rd; 273 rd->file = file; 274 spin_lock(&HFSPLUS_I(inode)->open_dir_lock); 275 list_add(&rd->list, &HFSPLUS_I(inode)->open_dir_list); 276 spin_unlock(&HFSPLUS_I(inode)->open_dir_lock); 277 } 278 /* 279 * Can be done after the list insertion; exclusion with 280 * hfsplus_delete_cat() is provided by directory lock. 281 */ 282 memcpy(&rd->key, fd.key, sizeof(struct hfsplus_cat_key)); 283 out: 284 kfree(strbuf); 285 hfs_find_exit(&fd); 286 return err; 287 } 288 289 static int hfsplus_dir_release(struct inode *inode, struct file *file) 290 { 291 struct hfsplus_readdir_data *rd = file->private_data; 292 if (rd) { 293 spin_lock(&HFSPLUS_I(inode)->open_dir_lock); 294 list_del(&rd->list); 295 spin_unlock(&HFSPLUS_I(inode)->open_dir_lock); 296 kfree(rd); 297 } 298 return 0; 299 } 300 301 static int hfsplus_link(struct dentry *src_dentry, struct inode *dst_dir, 302 struct dentry *dst_dentry) 303 { 304 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dst_dir->i_sb); 305 struct inode *inode = d_inode(src_dentry); 306 struct inode *src_dir = d_inode(src_dentry->d_parent); 307 struct qstr str; 308 char name[32]; 309 u32 cnid, id; 310 int res; 311 312 if (HFSPLUS_IS_RSRC(inode)) 313 return -EPERM; 314 if (!S_ISREG(inode->i_mode)) 315 return -EPERM; 316 317 mutex_lock(&sbi->vh_mutex); 318 if (inode->i_ino == (u32)(unsigned long)src_dentry->d_fsdata) { 319 for (;;) { 320 get_random_bytes(&id, sizeof(cnid)); 321 id &= 0x3fffffff; 322 str.name = name; 323 str.len = sprintf(name, "iNode%d", id); 324 res = hfsplus_rename_cat(inode->i_ino, 325 src_dir, &src_dentry->d_name, 326 sbi->hidden_dir, &str); 327 if (!res) 328 break; 329 if (res != -EEXIST) 330 goto out; 331 } 332 HFSPLUS_I(inode)->linkid = id; 333 cnid = sbi->next_cnid++; 334 src_dentry->d_fsdata = (void *)(unsigned long)cnid; 335 res = hfsplus_create_cat(cnid, src_dir, 336 &src_dentry->d_name, inode); 337 if (res) 338 /* panic? */ 339 goto out; 340 sbi->file_count++; 341 } 342 cnid = sbi->next_cnid++; 343 res = hfsplus_create_cat(cnid, dst_dir, &dst_dentry->d_name, inode); 344 if (res) 345 goto out; 346 347 inc_nlink(inode); 348 hfsplus_instantiate(dst_dentry, inode, cnid); 349 ihold(inode); 350 inode->i_ctime = current_time(inode); 351 mark_inode_dirty(inode); 352 sbi->file_count++; 353 hfsplus_mark_mdb_dirty(dst_dir->i_sb); 354 out: 355 mutex_unlock(&sbi->vh_mutex); 356 return res; 357 } 358 359 static int hfsplus_unlink(struct inode *dir, struct dentry *dentry) 360 { 361 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb); 362 struct inode *inode = d_inode(dentry); 363 struct qstr str; 364 char name[32]; 365 u32 cnid; 366 int res; 367 368 if (HFSPLUS_IS_RSRC(inode)) 369 return -EPERM; 370 371 mutex_lock(&sbi->vh_mutex); 372 cnid = (u32)(unsigned long)dentry->d_fsdata; 373 if (inode->i_ino == cnid && 374 atomic_read(&HFSPLUS_I(inode)->opencnt)) { 375 str.name = name; 376 str.len = sprintf(name, "temp%lu", inode->i_ino); 377 res = hfsplus_rename_cat(inode->i_ino, 378 dir, &dentry->d_name, 379 sbi->hidden_dir, &str); 380 if (!res) { 381 inode->i_flags |= S_DEAD; 382 drop_nlink(inode); 383 } 384 goto out; 385 } 386 res = hfsplus_delete_cat(cnid, dir, &dentry->d_name); 387 if (res) 388 goto out; 389 390 if (inode->i_nlink > 0) 391 drop_nlink(inode); 392 if (inode->i_ino == cnid) 393 clear_nlink(inode); 394 if (!inode->i_nlink) { 395 if (inode->i_ino != cnid) { 396 sbi->file_count--; 397 if (!atomic_read(&HFSPLUS_I(inode)->opencnt)) { 398 res = hfsplus_delete_cat(inode->i_ino, 399 sbi->hidden_dir, 400 NULL); 401 if (!res) 402 hfsplus_delete_inode(inode); 403 } else 404 inode->i_flags |= S_DEAD; 405 } else 406 hfsplus_delete_inode(inode); 407 } else 408 sbi->file_count--; 409 inode->i_ctime = current_time(inode); 410 mark_inode_dirty(inode); 411 out: 412 mutex_unlock(&sbi->vh_mutex); 413 return res; 414 } 415 416 static int hfsplus_rmdir(struct inode *dir, struct dentry *dentry) 417 { 418 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb); 419 struct inode *inode = d_inode(dentry); 420 int res; 421 422 if (inode->i_size != 2) 423 return -ENOTEMPTY; 424 425 mutex_lock(&sbi->vh_mutex); 426 res = hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name); 427 if (res) 428 goto out; 429 clear_nlink(inode); 430 inode->i_ctime = current_time(inode); 431 hfsplus_delete_inode(inode); 432 mark_inode_dirty(inode); 433 out: 434 mutex_unlock(&sbi->vh_mutex); 435 return res; 436 } 437 438 static int hfsplus_symlink(struct inode *dir, struct dentry *dentry, 439 const char *symname) 440 { 441 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb); 442 struct inode *inode; 443 int res = -ENOMEM; 444 445 mutex_lock(&sbi->vh_mutex); 446 inode = hfsplus_new_inode(dir->i_sb, dir, S_IFLNK | S_IRWXUGO); 447 if (!inode) 448 goto out; 449 450 res = page_symlink(inode, symname, strlen(symname) + 1); 451 if (res) 452 goto out_err; 453 454 res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode); 455 if (res) 456 goto out_err; 457 458 res = hfsplus_init_inode_security(inode, dir, &dentry->d_name); 459 if (res == -EOPNOTSUPP) 460 res = 0; /* Operation is not supported. */ 461 else if (res) { 462 /* Try to delete anyway without error analysis. */ 463 hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name); 464 goto out_err; 465 } 466 467 hfsplus_instantiate(dentry, inode, inode->i_ino); 468 mark_inode_dirty(inode); 469 goto out; 470 471 out_err: 472 clear_nlink(inode); 473 hfsplus_delete_inode(inode); 474 iput(inode); 475 out: 476 mutex_unlock(&sbi->vh_mutex); 477 return res; 478 } 479 480 static int hfsplus_mknod(struct inode *dir, struct dentry *dentry, 481 umode_t mode, dev_t rdev) 482 { 483 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb); 484 struct inode *inode; 485 int res = -ENOMEM; 486 487 mutex_lock(&sbi->vh_mutex); 488 inode = hfsplus_new_inode(dir->i_sb, dir, mode); 489 if (!inode) 490 goto out; 491 492 if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) 493 init_special_inode(inode, mode, rdev); 494 495 res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode); 496 if (res) 497 goto failed_mknod; 498 499 res = hfsplus_init_inode_security(inode, dir, &dentry->d_name); 500 if (res == -EOPNOTSUPP) 501 res = 0; /* Operation is not supported. */ 502 else if (res) { 503 /* Try to delete anyway without error analysis. */ 504 hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name); 505 goto failed_mknod; 506 } 507 508 hfsplus_instantiate(dentry, inode, inode->i_ino); 509 mark_inode_dirty(inode); 510 goto out; 511 512 failed_mknod: 513 clear_nlink(inode); 514 hfsplus_delete_inode(inode); 515 iput(inode); 516 out: 517 mutex_unlock(&sbi->vh_mutex); 518 return res; 519 } 520 521 static int hfsplus_create(struct inode *dir, struct dentry *dentry, umode_t mode, 522 bool excl) 523 { 524 return hfsplus_mknod(dir, dentry, mode, 0); 525 } 526 527 static int hfsplus_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 528 { 529 return hfsplus_mknod(dir, dentry, mode | S_IFDIR, 0); 530 } 531 532 static int hfsplus_rename(struct inode *old_dir, struct dentry *old_dentry, 533 struct inode *new_dir, struct dentry *new_dentry, 534 unsigned int flags) 535 { 536 int res; 537 538 if (flags & ~RENAME_NOREPLACE) 539 return -EINVAL; 540 541 /* Unlink destination if it already exists */ 542 if (d_really_is_positive(new_dentry)) { 543 if (d_is_dir(new_dentry)) 544 res = hfsplus_rmdir(new_dir, new_dentry); 545 else 546 res = hfsplus_unlink(new_dir, new_dentry); 547 if (res) 548 return res; 549 } 550 551 res = hfsplus_rename_cat((u32)(unsigned long)old_dentry->d_fsdata, 552 old_dir, &old_dentry->d_name, 553 new_dir, &new_dentry->d_name); 554 if (!res) 555 new_dentry->d_fsdata = old_dentry->d_fsdata; 556 return res; 557 } 558 559 const struct inode_operations hfsplus_dir_inode_operations = { 560 .lookup = hfsplus_lookup, 561 .create = hfsplus_create, 562 .link = hfsplus_link, 563 .unlink = hfsplus_unlink, 564 .mkdir = hfsplus_mkdir, 565 .rmdir = hfsplus_rmdir, 566 .symlink = hfsplus_symlink, 567 .mknod = hfsplus_mknod, 568 .rename = hfsplus_rename, 569 .listxattr = hfsplus_listxattr, 570 #ifdef CONFIG_HFSPLUS_FS_POSIX_ACL 571 .get_acl = hfsplus_get_posix_acl, 572 .set_acl = hfsplus_set_posix_acl, 573 #endif 574 }; 575 576 const struct file_operations hfsplus_dir_operations = { 577 .fsync = hfsplus_file_fsync, 578 .read = generic_read_dir, 579 .iterate_shared = hfsplus_readdir, 580 .unlocked_ioctl = hfsplus_ioctl, 581 .llseek = generic_file_llseek, 582 .release = hfsplus_dir_release, 583 }; 584