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 16 #include "hfsplus_fs.h" 17 #include "hfsplus_raw.h" 18 19 static inline void hfsplus_instantiate(struct dentry *dentry, 20 struct inode *inode, u32 cnid) 21 { 22 dentry->d_fsdata = (void *)(unsigned long)cnid; 23 d_instantiate(dentry, inode); 24 } 25 26 /* Find the entry inside dir named dentry->d_name */ 27 static struct dentry *hfsplus_lookup(struct inode *dir, struct dentry *dentry, 28 struct nameidata *nd) 29 { 30 struct inode *inode = NULL; 31 struct hfs_find_data fd; 32 struct super_block *sb; 33 hfsplus_cat_entry entry; 34 int err; 35 u32 cnid, linkid = 0; 36 u16 type; 37 38 sb = dir->i_sb; 39 40 d_set_d_op(dentry, &hfsplus_dentry_operations); 41 dentry->d_fsdata = NULL; 42 hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd); 43 hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, &dentry->d_name); 44 again: 45 err = hfs_brec_read(&fd, &entry, sizeof(entry)); 46 if (err) { 47 if (err == -ENOENT) { 48 hfs_find_exit(&fd); 49 /* No such entry */ 50 inode = NULL; 51 goto out; 52 } 53 goto fail; 54 } 55 type = be16_to_cpu(entry.type); 56 if (type == HFSPLUS_FOLDER) { 57 if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) { 58 err = -EIO; 59 goto fail; 60 } 61 cnid = be32_to_cpu(entry.folder.id); 62 dentry->d_fsdata = (void *)(unsigned long)cnid; 63 } else if (type == HFSPLUS_FILE) { 64 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) { 65 err = -EIO; 66 goto fail; 67 } 68 cnid = be32_to_cpu(entry.file.id); 69 if (entry.file.user_info.fdType == 70 cpu_to_be32(HFSP_HARDLINK_TYPE) && 71 entry.file.user_info.fdCreator == 72 cpu_to_be32(HFSP_HFSPLUS_CREATOR) && 73 (entry.file.create_date == 74 HFSPLUS_I(HFSPLUS_SB(sb)->hidden_dir)-> 75 create_date || 76 entry.file.create_date == 77 HFSPLUS_I(sb->s_root->d_inode)-> 78 create_date) && 79 HFSPLUS_SB(sb)->hidden_dir) { 80 struct qstr str; 81 char name[32]; 82 83 if (dentry->d_fsdata) { 84 /* 85 * We found a link pointing to another link, 86 * so ignore it and treat it as regular file. 87 */ 88 cnid = (unsigned long)dentry->d_fsdata; 89 linkid = 0; 90 } else { 91 dentry->d_fsdata = (void *)(unsigned long)cnid; 92 linkid = 93 be32_to_cpu(entry.file.permissions.dev); 94 str.len = sprintf(name, "iNode%d", linkid); 95 str.name = name; 96 hfsplus_cat_build_key(sb, fd.search_key, 97 HFSPLUS_SB(sb)->hidden_dir->i_ino, 98 &str); 99 goto again; 100 } 101 } else if (!dentry->d_fsdata) 102 dentry->d_fsdata = (void *)(unsigned long)cnid; 103 } else { 104 printk(KERN_ERR "hfs: invalid catalog entry type in lookup\n"); 105 err = -EIO; 106 goto fail; 107 } 108 hfs_find_exit(&fd); 109 inode = hfsplus_iget(dir->i_sb, cnid); 110 if (IS_ERR(inode)) 111 return ERR_CAST(inode); 112 if (S_ISREG(inode->i_mode)) 113 HFSPLUS_I(inode)->linkid = linkid; 114 out: 115 d_add(dentry, inode); 116 return NULL; 117 fail: 118 hfs_find_exit(&fd); 119 return ERR_PTR(err); 120 } 121 122 static int hfsplus_readdir(struct file *filp, void *dirent, filldir_t filldir) 123 { 124 struct inode *inode = filp->f_path.dentry->d_inode; 125 struct super_block *sb = inode->i_sb; 126 int len, err; 127 char strbuf[HFSPLUS_MAX_STRLEN + 1]; 128 hfsplus_cat_entry entry; 129 struct hfs_find_data fd; 130 struct hfsplus_readdir_data *rd; 131 u16 type; 132 133 if (filp->f_pos >= inode->i_size) 134 return 0; 135 136 hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd); 137 hfsplus_cat_build_key(sb, fd.search_key, inode->i_ino, NULL); 138 err = hfs_brec_find(&fd); 139 if (err) 140 goto out; 141 142 switch ((u32)filp->f_pos) { 143 case 0: 144 /* This is completely artificial... */ 145 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR)) 146 goto out; 147 filp->f_pos++; 148 /* fall through */ 149 case 1: 150 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 151 fd.entrylength); 152 if (be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) { 153 printk(KERN_ERR "hfs: bad catalog folder thread\n"); 154 err = -EIO; 155 goto out; 156 } 157 if (fd.entrylength < HFSPLUS_MIN_THREAD_SZ) { 158 printk(KERN_ERR "hfs: truncated catalog thread\n"); 159 err = -EIO; 160 goto out; 161 } 162 if (filldir(dirent, "..", 2, 1, 163 be32_to_cpu(entry.thread.parentID), DT_DIR)) 164 goto out; 165 filp->f_pos++; 166 /* fall through */ 167 default: 168 if (filp->f_pos >= inode->i_size) 169 goto out; 170 err = hfs_brec_goto(&fd, filp->f_pos - 1); 171 if (err) 172 goto out; 173 } 174 175 for (;;) { 176 if (be32_to_cpu(fd.key->cat.parent) != inode->i_ino) { 177 printk(KERN_ERR "hfs: walked past end of dir\n"); 178 err = -EIO; 179 goto out; 180 } 181 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 182 fd.entrylength); 183 type = be16_to_cpu(entry.type); 184 len = HFSPLUS_MAX_STRLEN; 185 err = hfsplus_uni2asc(sb, &fd.key->cat.name, strbuf, &len); 186 if (err) 187 goto out; 188 if (type == HFSPLUS_FOLDER) { 189 if (fd.entrylength < 190 sizeof(struct hfsplus_cat_folder)) { 191 printk(KERN_ERR "hfs: small dir entry\n"); 192 err = -EIO; 193 goto out; 194 } 195 if (HFSPLUS_SB(sb)->hidden_dir && 196 HFSPLUS_SB(sb)->hidden_dir->i_ino == 197 be32_to_cpu(entry.folder.id)) 198 goto next; 199 if (filldir(dirent, strbuf, len, filp->f_pos, 200 be32_to_cpu(entry.folder.id), DT_DIR)) 201 break; 202 } else if (type == HFSPLUS_FILE) { 203 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) { 204 printk(KERN_ERR "hfs: small file entry\n"); 205 err = -EIO; 206 goto out; 207 } 208 if (filldir(dirent, strbuf, len, filp->f_pos, 209 be32_to_cpu(entry.file.id), DT_REG)) 210 break; 211 } else { 212 printk(KERN_ERR "hfs: bad catalog entry type\n"); 213 err = -EIO; 214 goto out; 215 } 216 next: 217 filp->f_pos++; 218 if (filp->f_pos >= inode->i_size) 219 goto out; 220 err = hfs_brec_goto(&fd, 1); 221 if (err) 222 goto out; 223 } 224 rd = filp->private_data; 225 if (!rd) { 226 rd = kmalloc(sizeof(struct hfsplus_readdir_data), GFP_KERNEL); 227 if (!rd) { 228 err = -ENOMEM; 229 goto out; 230 } 231 filp->private_data = rd; 232 rd->file = filp; 233 list_add(&rd->list, &HFSPLUS_I(inode)->open_dir_list); 234 } 235 memcpy(&rd->key, fd.key, sizeof(struct hfsplus_cat_key)); 236 out: 237 hfs_find_exit(&fd); 238 return err; 239 } 240 241 static int hfsplus_dir_release(struct inode *inode, struct file *file) 242 { 243 struct hfsplus_readdir_data *rd = file->private_data; 244 if (rd) { 245 mutex_lock(&inode->i_mutex); 246 list_del(&rd->list); 247 mutex_unlock(&inode->i_mutex); 248 kfree(rd); 249 } 250 return 0; 251 } 252 253 static int hfsplus_link(struct dentry *src_dentry, struct inode *dst_dir, 254 struct dentry *dst_dentry) 255 { 256 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dst_dir->i_sb); 257 struct inode *inode = src_dentry->d_inode; 258 struct inode *src_dir = src_dentry->d_parent->d_inode; 259 struct qstr str; 260 char name[32]; 261 u32 cnid, id; 262 int res; 263 264 if (HFSPLUS_IS_RSRC(inode)) 265 return -EPERM; 266 if (!S_ISREG(inode->i_mode)) 267 return -EPERM; 268 269 mutex_lock(&sbi->vh_mutex); 270 if (inode->i_ino == (u32)(unsigned long)src_dentry->d_fsdata) { 271 for (;;) { 272 get_random_bytes(&id, sizeof(cnid)); 273 id &= 0x3fffffff; 274 str.name = name; 275 str.len = sprintf(name, "iNode%d", id); 276 res = hfsplus_rename_cat(inode->i_ino, 277 src_dir, &src_dentry->d_name, 278 sbi->hidden_dir, &str); 279 if (!res) 280 break; 281 if (res != -EEXIST) 282 goto out; 283 } 284 HFSPLUS_I(inode)->linkid = id; 285 cnid = sbi->next_cnid++; 286 src_dentry->d_fsdata = (void *)(unsigned long)cnid; 287 res = hfsplus_create_cat(cnid, src_dir, 288 &src_dentry->d_name, inode); 289 if (res) 290 /* panic? */ 291 goto out; 292 sbi->file_count++; 293 } 294 cnid = sbi->next_cnid++; 295 res = hfsplus_create_cat(cnid, dst_dir, &dst_dentry->d_name, inode); 296 if (res) 297 goto out; 298 299 inc_nlink(inode); 300 hfsplus_instantiate(dst_dentry, inode, cnid); 301 ihold(inode); 302 inode->i_ctime = CURRENT_TIME_SEC; 303 mark_inode_dirty(inode); 304 sbi->file_count++; 305 dst_dir->i_sb->s_dirt = 1; 306 out: 307 mutex_unlock(&sbi->vh_mutex); 308 return res; 309 } 310 311 static int hfsplus_unlink(struct inode *dir, struct dentry *dentry) 312 { 313 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb); 314 struct inode *inode = dentry->d_inode; 315 struct qstr str; 316 char name[32]; 317 u32 cnid; 318 int res; 319 320 if (HFSPLUS_IS_RSRC(inode)) 321 return -EPERM; 322 323 mutex_lock(&sbi->vh_mutex); 324 cnid = (u32)(unsigned long)dentry->d_fsdata; 325 if (inode->i_ino == cnid && 326 atomic_read(&HFSPLUS_I(inode)->opencnt)) { 327 str.name = name; 328 str.len = sprintf(name, "temp%lu", inode->i_ino); 329 res = hfsplus_rename_cat(inode->i_ino, 330 dir, &dentry->d_name, 331 sbi->hidden_dir, &str); 332 if (!res) { 333 inode->i_flags |= S_DEAD; 334 drop_nlink(inode); 335 } 336 goto out; 337 } 338 res = hfsplus_delete_cat(cnid, dir, &dentry->d_name); 339 if (res) 340 goto out; 341 342 if (inode->i_nlink > 0) 343 drop_nlink(inode); 344 if (inode->i_ino == cnid) 345 clear_nlink(inode); 346 if (!inode->i_nlink) { 347 if (inode->i_ino != cnid) { 348 sbi->file_count--; 349 if (!atomic_read(&HFSPLUS_I(inode)->opencnt)) { 350 res = hfsplus_delete_cat(inode->i_ino, 351 sbi->hidden_dir, 352 NULL); 353 if (!res) 354 hfsplus_delete_inode(inode); 355 } else 356 inode->i_flags |= S_DEAD; 357 } else 358 hfsplus_delete_inode(inode); 359 } else 360 sbi->file_count--; 361 inode->i_ctime = CURRENT_TIME_SEC; 362 mark_inode_dirty(inode); 363 out: 364 mutex_unlock(&sbi->vh_mutex); 365 return res; 366 } 367 368 static int hfsplus_rmdir(struct inode *dir, struct dentry *dentry) 369 { 370 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb); 371 struct inode *inode = dentry->d_inode; 372 int res; 373 374 if (inode->i_size != 2) 375 return -ENOTEMPTY; 376 377 mutex_lock(&sbi->vh_mutex); 378 res = hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name); 379 if (res) 380 goto out; 381 clear_nlink(inode); 382 inode->i_ctime = CURRENT_TIME_SEC; 383 hfsplus_delete_inode(inode); 384 mark_inode_dirty(inode); 385 out: 386 mutex_unlock(&sbi->vh_mutex); 387 return res; 388 } 389 390 static int hfsplus_symlink(struct inode *dir, struct dentry *dentry, 391 const char *symname) 392 { 393 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb); 394 struct inode *inode; 395 int res = -ENOSPC; 396 397 mutex_lock(&sbi->vh_mutex); 398 inode = hfsplus_new_inode(dir->i_sb, S_IFLNK | S_IRWXUGO); 399 if (!inode) 400 goto out; 401 402 res = page_symlink(inode, symname, strlen(symname) + 1); 403 if (res) 404 goto out_err; 405 406 res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode); 407 if (res) 408 goto out_err; 409 410 hfsplus_instantiate(dentry, inode, inode->i_ino); 411 mark_inode_dirty(inode); 412 goto out; 413 414 out_err: 415 inode->i_nlink = 0; 416 hfsplus_delete_inode(inode); 417 iput(inode); 418 out: 419 mutex_unlock(&sbi->vh_mutex); 420 return res; 421 } 422 423 static int hfsplus_mknod(struct inode *dir, struct dentry *dentry, 424 int mode, dev_t rdev) 425 { 426 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb); 427 struct inode *inode; 428 int res = -ENOSPC; 429 430 mutex_lock(&sbi->vh_mutex); 431 inode = hfsplus_new_inode(dir->i_sb, mode); 432 if (!inode) 433 goto out; 434 435 if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) 436 init_special_inode(inode, mode, rdev); 437 438 res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode); 439 if (res) { 440 inode->i_nlink = 0; 441 hfsplus_delete_inode(inode); 442 iput(inode); 443 goto out; 444 } 445 446 hfsplus_instantiate(dentry, inode, inode->i_ino); 447 mark_inode_dirty(inode); 448 out: 449 mutex_unlock(&sbi->vh_mutex); 450 return res; 451 } 452 453 static int hfsplus_create(struct inode *dir, struct dentry *dentry, int mode, 454 struct nameidata *nd) 455 { 456 return hfsplus_mknod(dir, dentry, mode, 0); 457 } 458 459 static int hfsplus_mkdir(struct inode *dir, struct dentry *dentry, int mode) 460 { 461 return hfsplus_mknod(dir, dentry, mode | S_IFDIR, 0); 462 } 463 464 static int hfsplus_rename(struct inode *old_dir, struct dentry *old_dentry, 465 struct inode *new_dir, struct dentry *new_dentry) 466 { 467 int res; 468 469 /* Unlink destination if it already exists */ 470 if (new_dentry->d_inode) { 471 if (S_ISDIR(new_dentry->d_inode->i_mode)) 472 res = hfsplus_rmdir(new_dir, new_dentry); 473 else 474 res = hfsplus_unlink(new_dir, new_dentry); 475 if (res) 476 return res; 477 } 478 479 res = hfsplus_rename_cat((u32)(unsigned long)old_dentry->d_fsdata, 480 old_dir, &old_dentry->d_name, 481 new_dir, &new_dentry->d_name); 482 if (!res) 483 new_dentry->d_fsdata = old_dentry->d_fsdata; 484 return res; 485 } 486 487 const struct inode_operations hfsplus_dir_inode_operations = { 488 .lookup = hfsplus_lookup, 489 .create = hfsplus_create, 490 .link = hfsplus_link, 491 .unlink = hfsplus_unlink, 492 .mkdir = hfsplus_mkdir, 493 .rmdir = hfsplus_rmdir, 494 .symlink = hfsplus_symlink, 495 .mknod = hfsplus_mknod, 496 .rename = hfsplus_rename, 497 }; 498 499 const struct file_operations hfsplus_dir_operations = { 500 .fsync = hfsplus_file_fsync, 501 .read = generic_read_dir, 502 .readdir = hfsplus_readdir, 503 .unlocked_ioctl = hfsplus_ioctl, 504 .llseek = generic_file_llseek, 505 .release = hfsplus_dir_release, 506 }; 507