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 hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, &dentry->d_name); 48 again: 49 err = hfs_brec_read(&fd, &entry, sizeof(entry)); 50 if (err) { 51 if (err == -ENOENT) { 52 hfs_find_exit(&fd); 53 /* No such entry */ 54 inode = NULL; 55 goto out; 56 } 57 goto fail; 58 } 59 type = be16_to_cpu(entry.type); 60 if (type == HFSPLUS_FOLDER) { 61 if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) { 62 err = -EIO; 63 goto fail; 64 } 65 cnid = be32_to_cpu(entry.folder.id); 66 dentry->d_fsdata = (void *)(unsigned long)cnid; 67 } else if (type == HFSPLUS_FILE) { 68 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) { 69 err = -EIO; 70 goto fail; 71 } 72 cnid = be32_to_cpu(entry.file.id); 73 if (entry.file.user_info.fdType == 74 cpu_to_be32(HFSP_HARDLINK_TYPE) && 75 entry.file.user_info.fdCreator == 76 cpu_to_be32(HFSP_HFSPLUS_CREATOR) && 77 (entry.file.create_date == 78 HFSPLUS_I(HFSPLUS_SB(sb)->hidden_dir)-> 79 create_date || 80 entry.file.create_date == 81 HFSPLUS_I(sb->s_root->d_inode)-> 82 create_date) && 83 HFSPLUS_SB(sb)->hidden_dir) { 84 struct qstr str; 85 char name[32]; 86 87 if (dentry->d_fsdata) { 88 /* 89 * We found a link pointing to another link, 90 * so ignore it and treat it as regular file. 91 */ 92 cnid = (unsigned long)dentry->d_fsdata; 93 linkid = 0; 94 } else { 95 dentry->d_fsdata = (void *)(unsigned long)cnid; 96 linkid = 97 be32_to_cpu(entry.file.permissions.dev); 98 str.len = sprintf(name, "iNode%d", linkid); 99 str.name = name; 100 hfsplus_cat_build_key(sb, fd.search_key, 101 HFSPLUS_SB(sb)->hidden_dir->i_ino, 102 &str); 103 goto again; 104 } 105 } else if (!dentry->d_fsdata) 106 dentry->d_fsdata = (void *)(unsigned long)cnid; 107 } else { 108 pr_err("invalid catalog entry type in lookup\n"); 109 err = -EIO; 110 goto fail; 111 } 112 hfs_find_exit(&fd); 113 inode = hfsplus_iget(dir->i_sb, cnid); 114 if (IS_ERR(inode)) 115 return ERR_CAST(inode); 116 if (S_ISREG(inode->i_mode)) 117 HFSPLUS_I(inode)->linkid = linkid; 118 out: 119 d_add(dentry, inode); 120 return NULL; 121 fail: 122 hfs_find_exit(&fd); 123 return ERR_PTR(err); 124 } 125 126 static int hfsplus_readdir(struct file *file, struct dir_context *ctx) 127 { 128 struct inode *inode = file_inode(file); 129 struct super_block *sb = inode->i_sb; 130 int len, err; 131 char *strbuf; 132 hfsplus_cat_entry entry; 133 struct hfs_find_data fd; 134 struct hfsplus_readdir_data *rd; 135 u16 type; 136 137 if (file->f_pos >= inode->i_size) 138 return 0; 139 140 err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd); 141 if (err) 142 return err; 143 strbuf = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_MAX_STRLEN + 1, GFP_KERNEL); 144 if (!strbuf) { 145 err = -ENOMEM; 146 goto out; 147 } 148 hfsplus_cat_build_key(sb, fd.search_key, inode->i_ino, NULL); 149 err = hfs_brec_find(&fd, hfs_find_rec_by_key); 150 if (err) 151 goto out; 152 153 if (ctx->pos == 0) { 154 /* This is completely artificial... */ 155 if (!dir_emit_dot(file, ctx)) 156 goto out; 157 ctx->pos = 1; 158 } 159 if (ctx->pos == 1) { 160 if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) { 161 err = -EIO; 162 goto out; 163 } 164 165 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 166 fd.entrylength); 167 if (be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) { 168 pr_err("bad catalog folder thread\n"); 169 err = -EIO; 170 goto out; 171 } 172 if (fd.entrylength < HFSPLUS_MIN_THREAD_SZ) { 173 pr_err("truncated catalog thread\n"); 174 err = -EIO; 175 goto out; 176 } 177 if (!dir_emit(ctx, "..", 2, 178 be32_to_cpu(entry.thread.parentID), DT_DIR)) 179 goto out; 180 ctx->pos = 2; 181 } 182 if (ctx->pos >= inode->i_size) 183 goto out; 184 err = hfs_brec_goto(&fd, ctx->pos - 1); 185 if (err) 186 goto out; 187 for (;;) { 188 if (be32_to_cpu(fd.key->cat.parent) != inode->i_ino) { 189 pr_err("walked past end of dir\n"); 190 err = -EIO; 191 goto out; 192 } 193 194 if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) { 195 err = -EIO; 196 goto out; 197 } 198 199 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 200 fd.entrylength); 201 type = be16_to_cpu(entry.type); 202 len = NLS_MAX_CHARSET_SIZE * HFSPLUS_MAX_STRLEN; 203 err = hfsplus_uni2asc(sb, &fd.key->cat.name, strbuf, &len); 204 if (err) 205 goto out; 206 if (type == HFSPLUS_FOLDER) { 207 if (fd.entrylength < 208 sizeof(struct hfsplus_cat_folder)) { 209 pr_err("small dir entry\n"); 210 err = -EIO; 211 goto out; 212 } 213 if (HFSPLUS_SB(sb)->hidden_dir && 214 HFSPLUS_SB(sb)->hidden_dir->i_ino == 215 be32_to_cpu(entry.folder.id)) 216 goto next; 217 if (!dir_emit(ctx, strbuf, len, 218 be32_to_cpu(entry.folder.id), DT_DIR)) 219 break; 220 } else if (type == HFSPLUS_FILE) { 221 u16 mode; 222 unsigned type = DT_UNKNOWN; 223 224 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) { 225 pr_err("small file entry\n"); 226 err = -EIO; 227 goto out; 228 } 229 230 mode = be16_to_cpu(entry.file.permissions.mode); 231 if (S_ISREG(mode)) 232 type = DT_REG; 233 else if (S_ISLNK(mode)) 234 type = DT_LNK; 235 else if (S_ISFIFO(mode)) 236 type = DT_FIFO; 237 else if (S_ISCHR(mode)) 238 type = DT_CHR; 239 else if (S_ISBLK(mode)) 240 type = DT_BLK; 241 else if (S_ISSOCK(mode)) 242 type = DT_SOCK; 243 244 if (!dir_emit(ctx, strbuf, len, 245 be32_to_cpu(entry.file.id), type)) 246 break; 247 } else { 248 pr_err("bad catalog entry type\n"); 249 err = -EIO; 250 goto out; 251 } 252 next: 253 ctx->pos++; 254 if (ctx->pos >= inode->i_size) 255 goto out; 256 err = hfs_brec_goto(&fd, 1); 257 if (err) 258 goto out; 259 } 260 rd = file->private_data; 261 if (!rd) { 262 rd = kmalloc(sizeof(struct hfsplus_readdir_data), GFP_KERNEL); 263 if (!rd) { 264 err = -ENOMEM; 265 goto out; 266 } 267 file->private_data = rd; 268 rd->file = file; 269 list_add(&rd->list, &HFSPLUS_I(inode)->open_dir_list); 270 } 271 memcpy(&rd->key, fd.key, sizeof(struct hfsplus_cat_key)); 272 out: 273 kfree(strbuf); 274 hfs_find_exit(&fd); 275 return err; 276 } 277 278 static int hfsplus_dir_release(struct inode *inode, struct file *file) 279 { 280 struct hfsplus_readdir_data *rd = file->private_data; 281 if (rd) { 282 mutex_lock(&inode->i_mutex); 283 list_del(&rd->list); 284 mutex_unlock(&inode->i_mutex); 285 kfree(rd); 286 } 287 return 0; 288 } 289 290 static int hfsplus_link(struct dentry *src_dentry, struct inode *dst_dir, 291 struct dentry *dst_dentry) 292 { 293 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dst_dir->i_sb); 294 struct inode *inode = src_dentry->d_inode; 295 struct inode *src_dir = src_dentry->d_parent->d_inode; 296 struct qstr str; 297 char name[32]; 298 u32 cnid, id; 299 int res; 300 301 if (HFSPLUS_IS_RSRC(inode)) 302 return -EPERM; 303 if (!S_ISREG(inode->i_mode)) 304 return -EPERM; 305 306 mutex_lock(&sbi->vh_mutex); 307 if (inode->i_ino == (u32)(unsigned long)src_dentry->d_fsdata) { 308 for (;;) { 309 get_random_bytes(&id, sizeof(cnid)); 310 id &= 0x3fffffff; 311 str.name = name; 312 str.len = sprintf(name, "iNode%d", id); 313 res = hfsplus_rename_cat(inode->i_ino, 314 src_dir, &src_dentry->d_name, 315 sbi->hidden_dir, &str); 316 if (!res) 317 break; 318 if (res != -EEXIST) 319 goto out; 320 } 321 HFSPLUS_I(inode)->linkid = id; 322 cnid = sbi->next_cnid++; 323 src_dentry->d_fsdata = (void *)(unsigned long)cnid; 324 res = hfsplus_create_cat(cnid, src_dir, 325 &src_dentry->d_name, inode); 326 if (res) 327 /* panic? */ 328 goto out; 329 sbi->file_count++; 330 } 331 cnid = sbi->next_cnid++; 332 res = hfsplus_create_cat(cnid, dst_dir, &dst_dentry->d_name, inode); 333 if (res) 334 goto out; 335 336 inc_nlink(inode); 337 hfsplus_instantiate(dst_dentry, inode, cnid); 338 ihold(inode); 339 inode->i_ctime = CURRENT_TIME_SEC; 340 mark_inode_dirty(inode); 341 sbi->file_count++; 342 hfsplus_mark_mdb_dirty(dst_dir->i_sb); 343 out: 344 mutex_unlock(&sbi->vh_mutex); 345 return res; 346 } 347 348 static int hfsplus_unlink(struct inode *dir, struct dentry *dentry) 349 { 350 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb); 351 struct inode *inode = dentry->d_inode; 352 struct qstr str; 353 char name[32]; 354 u32 cnid; 355 int res; 356 357 if (HFSPLUS_IS_RSRC(inode)) 358 return -EPERM; 359 360 mutex_lock(&sbi->vh_mutex); 361 cnid = (u32)(unsigned long)dentry->d_fsdata; 362 if (inode->i_ino == cnid && 363 atomic_read(&HFSPLUS_I(inode)->opencnt)) { 364 str.name = name; 365 str.len = sprintf(name, "temp%lu", inode->i_ino); 366 res = hfsplus_rename_cat(inode->i_ino, 367 dir, &dentry->d_name, 368 sbi->hidden_dir, &str); 369 if (!res) { 370 inode->i_flags |= S_DEAD; 371 drop_nlink(inode); 372 } 373 goto out; 374 } 375 res = hfsplus_delete_cat(cnid, dir, &dentry->d_name); 376 if (res) 377 goto out; 378 379 if (inode->i_nlink > 0) 380 drop_nlink(inode); 381 if (inode->i_ino == cnid) 382 clear_nlink(inode); 383 if (!inode->i_nlink) { 384 if (inode->i_ino != cnid) { 385 sbi->file_count--; 386 if (!atomic_read(&HFSPLUS_I(inode)->opencnt)) { 387 res = hfsplus_delete_cat(inode->i_ino, 388 sbi->hidden_dir, 389 NULL); 390 if (!res) 391 hfsplus_delete_inode(inode); 392 } else 393 inode->i_flags |= S_DEAD; 394 } else 395 hfsplus_delete_inode(inode); 396 } else 397 sbi->file_count--; 398 inode->i_ctime = CURRENT_TIME_SEC; 399 mark_inode_dirty(inode); 400 out: 401 mutex_unlock(&sbi->vh_mutex); 402 return res; 403 } 404 405 static int hfsplus_rmdir(struct inode *dir, struct dentry *dentry) 406 { 407 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb); 408 struct inode *inode = dentry->d_inode; 409 int res; 410 411 if (inode->i_size != 2) 412 return -ENOTEMPTY; 413 414 mutex_lock(&sbi->vh_mutex); 415 res = hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name); 416 if (res) 417 goto out; 418 clear_nlink(inode); 419 inode->i_ctime = CURRENT_TIME_SEC; 420 hfsplus_delete_inode(inode); 421 mark_inode_dirty(inode); 422 out: 423 mutex_unlock(&sbi->vh_mutex); 424 return res; 425 } 426 427 static int hfsplus_symlink(struct inode *dir, struct dentry *dentry, 428 const char *symname) 429 { 430 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb); 431 struct inode *inode; 432 int res = -ENOSPC; 433 434 mutex_lock(&sbi->vh_mutex); 435 inode = hfsplus_new_inode(dir->i_sb, S_IFLNK | S_IRWXUGO); 436 if (!inode) 437 goto out; 438 439 res = page_symlink(inode, symname, strlen(symname) + 1); 440 if (res) 441 goto out_err; 442 443 res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode); 444 if (res) 445 goto out_err; 446 447 res = hfsplus_init_inode_security(inode, dir, &dentry->d_name); 448 if (res == -EOPNOTSUPP) 449 res = 0; /* Operation is not supported. */ 450 else if (res) { 451 /* Try to delete anyway without error analysis. */ 452 hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name); 453 goto out_err; 454 } 455 456 hfsplus_instantiate(dentry, inode, inode->i_ino); 457 mark_inode_dirty(inode); 458 goto out; 459 460 out_err: 461 clear_nlink(inode); 462 hfsplus_delete_inode(inode); 463 iput(inode); 464 out: 465 mutex_unlock(&sbi->vh_mutex); 466 return res; 467 } 468 469 static int hfsplus_mknod(struct inode *dir, struct dentry *dentry, 470 umode_t mode, dev_t rdev) 471 { 472 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb); 473 struct inode *inode; 474 int res = -ENOSPC; 475 476 mutex_lock(&sbi->vh_mutex); 477 inode = hfsplus_new_inode(dir->i_sb, mode); 478 if (!inode) 479 goto out; 480 481 if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) 482 init_special_inode(inode, mode, rdev); 483 484 res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode); 485 if (res) 486 goto failed_mknod; 487 488 res = hfsplus_init_inode_security(inode, dir, &dentry->d_name); 489 if (res == -EOPNOTSUPP) 490 res = 0; /* Operation is not supported. */ 491 else if (res) { 492 /* Try to delete anyway without error analysis. */ 493 hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name); 494 goto failed_mknod; 495 } 496 497 hfsplus_instantiate(dentry, inode, inode->i_ino); 498 mark_inode_dirty(inode); 499 goto out; 500 501 failed_mknod: 502 clear_nlink(inode); 503 hfsplus_delete_inode(inode); 504 iput(inode); 505 out: 506 mutex_unlock(&sbi->vh_mutex); 507 return res; 508 } 509 510 static int hfsplus_create(struct inode *dir, struct dentry *dentry, umode_t mode, 511 bool excl) 512 { 513 return hfsplus_mknod(dir, dentry, mode, 0); 514 } 515 516 static int hfsplus_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 517 { 518 return hfsplus_mknod(dir, dentry, mode | S_IFDIR, 0); 519 } 520 521 static int hfsplus_rename(struct inode *old_dir, struct dentry *old_dentry, 522 struct inode *new_dir, struct dentry *new_dentry) 523 { 524 int res; 525 526 /* Unlink destination if it already exists */ 527 if (new_dentry->d_inode) { 528 if (S_ISDIR(new_dentry->d_inode->i_mode)) 529 res = hfsplus_rmdir(new_dir, new_dentry); 530 else 531 res = hfsplus_unlink(new_dir, new_dentry); 532 if (res) 533 return res; 534 } 535 536 res = hfsplus_rename_cat((u32)(unsigned long)old_dentry->d_fsdata, 537 old_dir, &old_dentry->d_name, 538 new_dir, &new_dentry->d_name); 539 if (!res) 540 new_dentry->d_fsdata = old_dentry->d_fsdata; 541 return res; 542 } 543 544 const struct inode_operations hfsplus_dir_inode_operations = { 545 .lookup = hfsplus_lookup, 546 .create = hfsplus_create, 547 .link = hfsplus_link, 548 .unlink = hfsplus_unlink, 549 .mkdir = hfsplus_mkdir, 550 .rmdir = hfsplus_rmdir, 551 .symlink = hfsplus_symlink, 552 .mknod = hfsplus_mknod, 553 .rename = hfsplus_rename, 554 .setxattr = generic_setxattr, 555 .getxattr = generic_getxattr, 556 .listxattr = hfsplus_listxattr, 557 .removexattr = generic_removexattr, 558 #ifdef CONFIG_HFSPLUS_FS_POSIX_ACL 559 .get_acl = hfsplus_get_posix_acl, 560 .set_acl = hfsplus_set_posix_acl, 561 #endif 562 }; 563 564 const struct file_operations hfsplus_dir_operations = { 565 .fsync = hfsplus_file_fsync, 566 .read = generic_read_dir, 567 .iterate = hfsplus_readdir, 568 .unlocked_ioctl = hfsplus_ioctl, 569 .llseek = generic_file_llseek, 570 .release = hfsplus_dir_release, 571 }; 572