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