1 /* 2 * linux/fs/hfsplus/dir.c 3 * 4 * Copyright (C) 2001 5 * Brad Boyer (flar@allandria.com) 6 * (C) 2003 Ardis Technologies <roman@ardistech.com> 7 * 8 * Handling of directories 9 */ 10 11 #include <linux/errno.h> 12 #include <linux/fs.h> 13 #include <linux/slab.h> 14 #include <linux/random.h> 15 #include <linux/nls.h> 16 17 #include "hfsplus_fs.h" 18 #include "hfsplus_raw.h" 19 #include "xattr.h" 20 #include "acl.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 = hfs_brec_read(&fd, &entry, sizeof(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 (entry.file.create_date == 81 HFSPLUS_I(HFSPLUS_SB(sb)->hidden_dir)-> 82 create_date || 83 entry.file.create_date == 84 HFSPLUS_I(d_inode(sb->s_root))-> 85 create_date) && 86 HFSPLUS_SB(sb)->hidden_dir) { 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 d_add(dentry, inode); 125 return NULL; 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 list_add(&rd->list, &HFSPLUS_I(inode)->open_dir_list); 275 } 276 memcpy(&rd->key, fd.key, sizeof(struct hfsplus_cat_key)); 277 out: 278 kfree(strbuf); 279 hfs_find_exit(&fd); 280 return err; 281 } 282 283 static int hfsplus_dir_release(struct inode *inode, struct file *file) 284 { 285 struct hfsplus_readdir_data *rd = file->private_data; 286 if (rd) { 287 mutex_lock(&inode->i_mutex); 288 list_del(&rd->list); 289 mutex_unlock(&inode->i_mutex); 290 kfree(rd); 291 } 292 return 0; 293 } 294 295 static int hfsplus_link(struct dentry *src_dentry, struct inode *dst_dir, 296 struct dentry *dst_dentry) 297 { 298 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dst_dir->i_sb); 299 struct inode *inode = d_inode(src_dentry); 300 struct inode *src_dir = d_inode(src_dentry->d_parent); 301 struct qstr str; 302 char name[32]; 303 u32 cnid, id; 304 int res; 305 306 if (HFSPLUS_IS_RSRC(inode)) 307 return -EPERM; 308 if (!S_ISREG(inode->i_mode)) 309 return -EPERM; 310 311 mutex_lock(&sbi->vh_mutex); 312 if (inode->i_ino == (u32)(unsigned long)src_dentry->d_fsdata) { 313 for (;;) { 314 get_random_bytes(&id, sizeof(cnid)); 315 id &= 0x3fffffff; 316 str.name = name; 317 str.len = sprintf(name, "iNode%d", id); 318 res = hfsplus_rename_cat(inode->i_ino, 319 src_dir, &src_dentry->d_name, 320 sbi->hidden_dir, &str); 321 if (!res) 322 break; 323 if (res != -EEXIST) 324 goto out; 325 } 326 HFSPLUS_I(inode)->linkid = id; 327 cnid = sbi->next_cnid++; 328 src_dentry->d_fsdata = (void *)(unsigned long)cnid; 329 res = hfsplus_create_cat(cnid, src_dir, 330 &src_dentry->d_name, inode); 331 if (res) 332 /* panic? */ 333 goto out; 334 sbi->file_count++; 335 } 336 cnid = sbi->next_cnid++; 337 res = hfsplus_create_cat(cnid, dst_dir, &dst_dentry->d_name, inode); 338 if (res) 339 goto out; 340 341 inc_nlink(inode); 342 hfsplus_instantiate(dst_dentry, inode, cnid); 343 ihold(inode); 344 inode->i_ctime = CURRENT_TIME_SEC; 345 mark_inode_dirty(inode); 346 sbi->file_count++; 347 hfsplus_mark_mdb_dirty(dst_dir->i_sb); 348 out: 349 mutex_unlock(&sbi->vh_mutex); 350 return res; 351 } 352 353 static int hfsplus_unlink(struct inode *dir, struct dentry *dentry) 354 { 355 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb); 356 struct inode *inode = d_inode(dentry); 357 struct qstr str; 358 char name[32]; 359 u32 cnid; 360 int res; 361 362 if (HFSPLUS_IS_RSRC(inode)) 363 return -EPERM; 364 365 mutex_lock(&sbi->vh_mutex); 366 cnid = (u32)(unsigned long)dentry->d_fsdata; 367 if (inode->i_ino == cnid && 368 atomic_read(&HFSPLUS_I(inode)->opencnt)) { 369 str.name = name; 370 str.len = sprintf(name, "temp%lu", inode->i_ino); 371 res = hfsplus_rename_cat(inode->i_ino, 372 dir, &dentry->d_name, 373 sbi->hidden_dir, &str); 374 if (!res) { 375 inode->i_flags |= S_DEAD; 376 drop_nlink(inode); 377 } 378 goto out; 379 } 380 res = hfsplus_delete_cat(cnid, dir, &dentry->d_name); 381 if (res) 382 goto out; 383 384 if (inode->i_nlink > 0) 385 drop_nlink(inode); 386 if (inode->i_ino == cnid) 387 clear_nlink(inode); 388 if (!inode->i_nlink) { 389 if (inode->i_ino != cnid) { 390 sbi->file_count--; 391 if (!atomic_read(&HFSPLUS_I(inode)->opencnt)) { 392 res = hfsplus_delete_cat(inode->i_ino, 393 sbi->hidden_dir, 394 NULL); 395 if (!res) 396 hfsplus_delete_inode(inode); 397 } else 398 inode->i_flags |= S_DEAD; 399 } else 400 hfsplus_delete_inode(inode); 401 } else 402 sbi->file_count--; 403 inode->i_ctime = CURRENT_TIME_SEC; 404 mark_inode_dirty(inode); 405 out: 406 mutex_unlock(&sbi->vh_mutex); 407 return res; 408 } 409 410 static int hfsplus_rmdir(struct inode *dir, struct dentry *dentry) 411 { 412 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb); 413 struct inode *inode = d_inode(dentry); 414 int res; 415 416 if (inode->i_size != 2) 417 return -ENOTEMPTY; 418 419 mutex_lock(&sbi->vh_mutex); 420 res = hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name); 421 if (res) 422 goto out; 423 clear_nlink(inode); 424 inode->i_ctime = CURRENT_TIME_SEC; 425 hfsplus_delete_inode(inode); 426 mark_inode_dirty(inode); 427 out: 428 mutex_unlock(&sbi->vh_mutex); 429 return res; 430 } 431 432 static int hfsplus_symlink(struct inode *dir, struct dentry *dentry, 433 const char *symname) 434 { 435 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb); 436 struct inode *inode; 437 int res = -ENOMEM; 438 439 mutex_lock(&sbi->vh_mutex); 440 inode = hfsplus_new_inode(dir->i_sb, S_IFLNK | S_IRWXUGO); 441 if (!inode) 442 goto out; 443 444 res = page_symlink(inode, symname, strlen(symname) + 1); 445 if (res) 446 goto out_err; 447 448 res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode); 449 if (res) 450 goto out_err; 451 452 res = hfsplus_init_inode_security(inode, dir, &dentry->d_name); 453 if (res == -EOPNOTSUPP) 454 res = 0; /* Operation is not supported. */ 455 else if (res) { 456 /* Try to delete anyway without error analysis. */ 457 hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name); 458 goto out_err; 459 } 460 461 hfsplus_instantiate(dentry, inode, inode->i_ino); 462 mark_inode_dirty(inode); 463 goto out; 464 465 out_err: 466 clear_nlink(inode); 467 hfsplus_delete_inode(inode); 468 iput(inode); 469 out: 470 mutex_unlock(&sbi->vh_mutex); 471 return res; 472 } 473 474 static int hfsplus_mknod(struct inode *dir, struct dentry *dentry, 475 umode_t mode, dev_t rdev) 476 { 477 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb); 478 struct inode *inode; 479 int res = -ENOMEM; 480 481 mutex_lock(&sbi->vh_mutex); 482 inode = hfsplus_new_inode(dir->i_sb, mode); 483 if (!inode) 484 goto out; 485 486 if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) 487 init_special_inode(inode, mode, rdev); 488 489 res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode); 490 if (res) 491 goto failed_mknod; 492 493 res = hfsplus_init_inode_security(inode, dir, &dentry->d_name); 494 if (res == -EOPNOTSUPP) 495 res = 0; /* Operation is not supported. */ 496 else if (res) { 497 /* Try to delete anyway without error analysis. */ 498 hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name); 499 goto failed_mknod; 500 } 501 502 hfsplus_instantiate(dentry, inode, inode->i_ino); 503 mark_inode_dirty(inode); 504 goto out; 505 506 failed_mknod: 507 clear_nlink(inode); 508 hfsplus_delete_inode(inode); 509 iput(inode); 510 out: 511 mutex_unlock(&sbi->vh_mutex); 512 return res; 513 } 514 515 static int hfsplus_create(struct inode *dir, struct dentry *dentry, umode_t mode, 516 bool excl) 517 { 518 return hfsplus_mknod(dir, dentry, mode, 0); 519 } 520 521 static int hfsplus_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 522 { 523 return hfsplus_mknod(dir, dentry, mode | S_IFDIR, 0); 524 } 525 526 static int hfsplus_rename(struct inode *old_dir, struct dentry *old_dentry, 527 struct inode *new_dir, struct dentry *new_dentry) 528 { 529 int res; 530 531 /* Unlink destination if it already exists */ 532 if (d_really_is_positive(new_dentry)) { 533 if (d_is_dir(new_dentry)) 534 res = hfsplus_rmdir(new_dir, new_dentry); 535 else 536 res = hfsplus_unlink(new_dir, new_dentry); 537 if (res) 538 return res; 539 } 540 541 res = hfsplus_rename_cat((u32)(unsigned long)old_dentry->d_fsdata, 542 old_dir, &old_dentry->d_name, 543 new_dir, &new_dentry->d_name); 544 if (!res) 545 new_dentry->d_fsdata = old_dentry->d_fsdata; 546 return res; 547 } 548 549 const struct inode_operations hfsplus_dir_inode_operations = { 550 .lookup = hfsplus_lookup, 551 .create = hfsplus_create, 552 .link = hfsplus_link, 553 .unlink = hfsplus_unlink, 554 .mkdir = hfsplus_mkdir, 555 .rmdir = hfsplus_rmdir, 556 .symlink = hfsplus_symlink, 557 .mknod = hfsplus_mknod, 558 .rename = hfsplus_rename, 559 .setxattr = generic_setxattr, 560 .getxattr = generic_getxattr, 561 .listxattr = hfsplus_listxattr, 562 .removexattr = generic_removexattr, 563 #ifdef CONFIG_HFSPLUS_FS_POSIX_ACL 564 .get_acl = hfsplus_get_posix_acl, 565 .set_acl = hfsplus_set_posix_acl, 566 #endif 567 }; 568 569 const struct file_operations hfsplus_dir_operations = { 570 .fsync = hfsplus_file_fsync, 571 .read = generic_read_dir, 572 .iterate = hfsplus_readdir, 573 .unlocked_ioctl = hfsplus_ioctl, 574 .llseek = generic_file_llseek, 575 .release = hfsplus_dir_release, 576 }; 577