fs/hfsplus/catalog.c

   1 /*
   2  *  linux/fs/hfsplus/catalog.c
   3  *
   4  * Copyright (C) 2001
   5  * Brad Boyer (flar@allandria.com)
   6  * (C) 2003 Ardis Technologies <roman@ardistech.com>
   7  *
   8  * Handling of catalog records
   9  */
  10
  11
  12 #include "hfsplus_fs.h"
  13 #include "hfsplus_raw.h"
  14
  15 int hfsplus_cat_case_cmp_key(const hfsplus_btree_key *k1,
  16                              const hfsplus_btree_key *k2)
  17 {
  18         __be32 k1p, k2p;
  19
  20         k1p = k1->cat.parent;
  21         k2p = k2->cat.parent;
  22         if (k1p != k2p)
  23                 return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1;
  24
  25         return hfsplus_strcasecmp(&k1->cat.name, &k2->cat.name);
  26 }
  27
  28 int hfsplus_cat_bin_cmp_key(const hfsplus_btree_key *k1,
  29                             const hfsplus_btree_key *k2)
  30 {
  31         __be32 k1p, k2p;
  32
  33         k1p = k1->cat.parent;
  34         k2p = k2->cat.parent;
  35         if (k1p != k2p)
  36                 return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1;
  37
  38         return hfsplus_strcmp(&k1->cat.name, &k2->cat.name);
  39 }
  40
  41 /* Generates key for catalog file/folders record. */
  42 int hfsplus_cat_build_key(struct super_block *sb,
  43                 hfsplus_btree_key *key, u32 parent, const struct qstr *str)
  44 {
  45         int len, err;
  46
  47         key->cat.parent = cpu_to_be32(parent);
  48         err = hfsplus_asc2uni(sb, &key->cat.name, HFSPLUS_MAX_STRLEN,
  49                         str->name, str->len);
  50         if (unlikely(err < 0))
  51                 return err;
  52
  53         len = be16_to_cpu(key->cat.name.length);
  54         key->key_len = cpu_to_be16(6 + 2 * len);
  55         return 0;
  56 }
  57
  58 /* Generates key for catalog thread record. */
  59 void hfsplus_cat_build_key_with_cnid(struct super_block *sb,
  60                         hfsplus_btree_key *key, u32 parent)
  61 {
  62         key->cat.parent = cpu_to_be32(parent);
  63         key->cat.name.length = 0;
  64         key->key_len = cpu_to_be16(6);
  65 }
  66
  67 static void hfsplus_cat_build_key_uni(hfsplus_btree_key *key, u32 parent,
  68                                       struct hfsplus_unistr *name)
  69 {
  70         int ustrlen;
  71
  72         ustrlen = be16_to_cpu(name->length);
  73         key->cat.parent = cpu_to_be32(parent);
  74         key->cat.name.length = cpu_to_be16(ustrlen);
  75         ustrlen *= 2;
  76         memcpy(key->cat.name.unicode, name->unicode, ustrlen);
  77         key->key_len = cpu_to_be16(6 + ustrlen);
  78 }
  79
  80 void hfsplus_cat_set_perms(struct inode *inode, struct hfsplus_perm *perms)
  81 {
  82         if (inode->i_flags & S_IMMUTABLE)
  83                 perms->rootflags |= HFSPLUS_FLG_IMMUTABLE;
  84         else
  85                 perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
  86         if (inode->i_flags & S_APPEND)
  87                 perms->rootflags |= HFSPLUS_FLG_APPEND;
  88         else
  89                 perms->rootflags &= ~HFSPLUS_FLG_APPEND;
  90
  91         perms->userflags = HFSPLUS_I(inode)->userflags;
  92         perms->mode = cpu_to_be16(inode->i_mode);
  93         perms->owner = cpu_to_be32(i_uid_read(inode));
  94         perms->group = cpu_to_be32(i_gid_read(inode));
  95
  96         if (S_ISREG(inode->i_mode))
  97                 perms->dev = cpu_to_be32(inode->i_nlink);
  98         else if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode))
  99                 perms->dev = cpu_to_be32(inode->i_rdev);
 100         else
 101                 perms->dev = 0;
 102 }
 103
 104 static int hfsplus_cat_build_record(hfsplus_cat_entry *entry,
 105                 u32 cnid, struct inode *inode)
 106 {
 107         struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
 108
 109         if (S_ISDIR(inode->i_mode)) {
 110                 struct hfsplus_cat_folder *folder;
 111
 112                 folder = &entry->folder;
 113                 memset(folder, 0, sizeof(*folder));
 114                 folder->type = cpu_to_be16(HFSPLUS_FOLDER);
 115                 if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags))
 116                         folder->flags |= cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT);
 117                 folder->id = cpu_to_be32(inode->i_ino);
 118                 HFSPLUS_I(inode)->create_date =
 119                         folder->create_date =
 120                         folder->content_mod_date =
 121                         folder->attribute_mod_date =
 122                         folder->access_date = hfsp_now2mt();
 123                 hfsplus_cat_set_perms(inode, &folder->permissions);
 124                 if (inode == sbi->hidden_dir)
 125                         /* invisible and namelocked */
 126                         folder->user_info.frFlags = cpu_to_be16(0x5000);
 127                 return sizeof(*folder);
 128         } else {
 129                 struct hfsplus_cat_file *file;
 130
 131                 file = &entry->file;
 132                 memset(file, 0, sizeof(*file));
 133                 file->type = cpu_to_be16(HFSPLUS_FILE);
 134                 file->flags = cpu_to_be16(HFSPLUS_FILE_THREAD_EXISTS);
 135                 file->id = cpu_to_be32(cnid);
 136                 HFSPLUS_I(inode)->create_date =
 137                         file->create_date =
 138                         file->content_mod_date =
 139                         file->attribute_mod_date =
 140                         file->access_date = hfsp_now2mt();
 141                 if (cnid == inode->i_ino) {
 142                         hfsplus_cat_set_perms(inode, &file->permissions);
 143                         if (S_ISLNK(inode->i_mode)) {
 144                                 file->user_info.fdType =
 145                                         cpu_to_be32(HFSP_SYMLINK_TYPE);
 146                                 file->user_info.fdCreator =
 147                                         cpu_to_be32(HFSP_SYMLINK_CREATOR);
 148                         } else {
 149                                 file->user_info.fdType =
 150                                         cpu_to_be32(sbi->type);
 151                                 file->user_info.fdCreator =
 152                                         cpu_to_be32(sbi->creator);
 153                         }
 154                         if (HFSPLUS_FLG_IMMUTABLE &
 155                                         (file->permissions.rootflags |
 156                                         file->permissions.userflags))
 157                                 file->flags |=
 158                                         cpu_to_be16(HFSPLUS_FILE_LOCKED);
 159                 } else {
 160                         file->user_info.fdType =
 161                                 cpu_to_be32(HFSP_HARDLINK_TYPE);
 162                         file->user_info.fdCreator =
 163                                 cpu_to_be32(HFSP_HFSPLUS_CREATOR);
 164                         file->user_info.fdFlags =
 165                                 cpu_to_be16(0x100);
 166                         file->create_date =
 167                                 HFSPLUS_I(sbi->hidden_dir)->create_date;
 168                         file->permissions.dev =
 169                                 cpu_to_be32(HFSPLUS_I(inode)->linkid);
 170                 }
 171                 return sizeof(*file);
 172         }
 173 }
 174
 175 static int hfsplus_fill_cat_thread(struct super_block *sb,
 176                                    hfsplus_cat_entry *entry, int type,
 177                                    u32 parentid, const struct qstr *str)
 178 {
 179         int err;
 180
 181         entry->type = cpu_to_be16(type);
 182         entry->thread.reserved = 0;
 183         entry->thread.parentID = cpu_to_be32(parentid);
 184         err = hfsplus_asc2uni(sb, &entry->thread.nodeName, HFSPLUS_MAX_STRLEN,
 185                                 str->name, str->len);
 186         if (unlikely(err < 0))
 187                 return err;
 188
 189         return 10 + be16_to_cpu(entry->thread.nodeName.length) * 2;
 190 }
 191
 192 /* Try to get a catalog entry for given catalog id */
 193 int hfsplus_find_cat(struct super_block *sb, u32 cnid,
 194                      struct hfs_find_data *fd)
 195 {
 196         hfsplus_cat_entry tmp;
 197         int err;
 198         u16 type;
 199
 200         hfsplus_cat_build_key_with_cnid(sb, fd->search_key, cnid);
 201         err = hfs_brec_read(fd, &tmp, sizeof(hfsplus_cat_entry));
 202         if (err)
 203                 return err;
 204
 205         type = be16_to_cpu(tmp.type);
 206         if (type != HFSPLUS_FOLDER_THREAD && type != HFSPLUS_FILE_THREAD) {
 207                 pr_err("found bad thread record in catalog\n");
 208                 return -EIO;
 209         }
 210
 211         if (be16_to_cpu(tmp.thread.nodeName.length) > 255) {
 212                 pr_err("catalog name length corrupted\n");
 213                 return -EIO;
 214         }
 215
 216         hfsplus_cat_build_key_uni(fd->search_key,
 217                 be32_to_cpu(tmp.thread.parentID),
 218                 &tmp.thread.nodeName);
 219         return hfs_brec_find(fd, hfs_find_rec_by_key);
 220 }
 221
 222 static void hfsplus_subfolders_inc(struct inode *dir)
 223 {
 224         struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
 225
 226         if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags)) {
 227                 /*
 228                  * Increment subfolder count. Note, the value is only meaningful
 229                  * for folders with HFSPLUS_HAS_FOLDER_COUNT flag set.
 230                  */
 231                 HFSPLUS_I(dir)->subfolders++;
 232         }
 233 }
 234
 235 static void hfsplus_subfolders_dec(struct inode *dir)
 236 {
 237         struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
 238
 239         if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags)) {
 240                 /*
 241                  * Decrement subfolder count. Note, the value is only meaningful
 242                  * for folders with HFSPLUS_HAS_FOLDER_COUNT flag set.
 243                  *
 244                  * Check for zero. Some subfolders may have been created
 245                  * by an implementation ignorant of this counter.
 246                  */
 247                 if (HFSPLUS_I(dir)->subfolders)
 248                         HFSPLUS_I(dir)->subfolders--;
 249         }
 250 }
 251
 252 int hfsplus_create_cat(u32 cnid, struct inode *dir,
 253                 const struct qstr *str, struct inode *inode)
 254 {
 255         struct super_block *sb = dir->i_sb;
 256         struct hfs_find_data fd;
 257         hfsplus_cat_entry entry;
 258         int entry_size;
 259         int err;
 260
 261         hfs_dbg(CAT_MOD, "create_cat: %s,%u(%d)\n",
 262                 str->name, cnid, inode->i_nlink);
 263         err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
 264         if (err)
 265                 return err;
 266
 267         /*
 268          * Fail early and avoid ENOSPC during the btree operations. We may
 269          * have to split the root node at most once.
 270          */
 271         err = hfs_bmap_reserve(fd.tree, 2 * fd.tree->depth);
 272         if (err)
 273                 goto err2;
 274
 275         hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
 276         entry_size = hfsplus_fill_cat_thread(sb, &entry,
 277                 S_ISDIR(inode->i_mode) ?
 278                         HFSPLUS_FOLDER_THREAD : HFSPLUS_FILE_THREAD,
 279                 dir->i_ino, str);
 280         if (unlikely(entry_size < 0)) {
 281                 err = entry_size;
 282                 goto err2;
 283         }
 284
 285         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
 286         if (err != -ENOENT) {
 287                 if (!err)
 288                         err = -EEXIST;
 289                 goto err2;
 290         }
 291         err = hfs_brec_insert(&fd, &entry, entry_size);
 292         if (err)
 293                 goto err2;
 294
 295         err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
 296         if (unlikely(err))
 297                 goto err1;
 298
 299         entry_size = hfsplus_cat_build_record(&entry, cnid, inode);
 300         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
 301         if (err != -ENOENT) {
 302                 /* panic? */
 303                 if (!err)
 304                         err = -EEXIST;
 305                 goto err1;
 306         }
 307         err = hfs_brec_insert(&fd, &entry, entry_size);
 308         if (err)
 309                 goto err1;
 310
 311         dir->i_size++;
 312         if (S_ISDIR(inode->i_mode))
 313                 hfsplus_subfolders_inc(dir);
 314         dir->i_mtime = dir->i_ctime = current_time(dir);
 315         hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
 316
 317         hfs_find_exit(&fd);
 318         return 0;
 319
 320 err1:
 321         hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
 322         if (!hfs_brec_find(&fd, hfs_find_rec_by_key))
 323                 hfs_brec_remove(&fd);
 324 err2:
 325         hfs_find_exit(&fd);
 326         return err;
 327 }
 328
 329 int hfsplus_delete_cat(u32 cnid, struct inode *dir, const struct qstr *str)
 330 {
 331         struct super_block *sb = dir->i_sb;
 332         struct hfs_find_data fd;
 333         struct hfsplus_fork_raw fork;
 334         struct list_head *pos;
 335         int err, off;
 336         u16 type;
 337
 338         hfs_dbg(CAT_MOD, "delete_cat: %s,%u\n", str ? str->name : NULL, cnid);
 339         err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
 340         if (err)
 341                 return err;
 342
 343         /*
 344          * Fail early and avoid ENOSPC during the btree operations. We may
 345          * have to split the root node at most once.
 346          */
 347         err = hfs_bmap_reserve(fd.tree, 2 * (int)fd.tree->depth - 2);
 348         if (err)
 349                 goto out;
 350
 351         if (!str) {
 352                 int len;
 353
 354                 hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
 355                 err = hfs_brec_find(&fd, hfs_find_rec_by_key);
 356                 if (err)
 357                         goto out;
 358
 359                 off = fd.entryoffset +
 360                         offsetof(struct hfsplus_cat_thread, nodeName);
 361                 fd.search_key->cat.parent = cpu_to_be32(dir->i_ino);
 362                 hfs_bnode_read(fd.bnode,
 363                         &fd.search_key->cat.name.length, off, 2);
 364                 len = be16_to_cpu(fd.search_key->cat.name.length) * 2;
 365                 hfs_bnode_read(fd.bnode,
 366                         &fd.search_key->cat.name.unicode,
 367                         off + 2, len);
 368                 fd.search_key->key_len = cpu_to_be16(6 + len);
 369         } else {
 370                 err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
 371                 if (unlikely(err))
 372                         goto out;
 373         }
 374
 375         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
 376         if (err)
 377                 goto out;
 378
 379         type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
 380         if (type == HFSPLUS_FILE) {
 381 #if 0
 382                 off = fd.entryoffset + offsetof(hfsplus_cat_file, data_fork);
 383                 hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
 384                 hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_DATA);
 385 #endif
 386
 387                 off = fd.entryoffset +
 388                         offsetof(struct hfsplus_cat_file, rsrc_fork);
 389                 hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
 390                 hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_RSRC);
 391         }
 392
 393         /* we only need to take spinlock for exclusion with ->release() */
 394         spin_lock(&HFSPLUS_I(dir)->open_dir_lock);
 395         list_for_each(pos, &HFSPLUS_I(dir)->open_dir_list) {
 396                 struct hfsplus_readdir_data *rd =
 397                         list_entry(pos, struct hfsplus_readdir_data, list);
 398                 if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
 399                         rd->file->f_pos--;
 400         }
 401         spin_unlock(&HFSPLUS_I(dir)->open_dir_lock);
 402
 403         err = hfs_brec_remove(&fd);
 404         if (err)
 405                 goto out;
 406
 407         hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
 408         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
 409         if (err)
 410                 goto out;
 411
 412         err = hfs_brec_remove(&fd);
 413         if (err)
 414                 goto out;
 415
 416         dir->i_size--;
 417         if (type == HFSPLUS_FOLDER)
 418                 hfsplus_subfolders_dec(dir);
 419         dir->i_mtime = dir->i_ctime = current_time(dir);
 420         hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
 421
 422         if (type == HFSPLUS_FILE || type == HFSPLUS_FOLDER) {
 423                 if (HFSPLUS_SB(sb)->attr_tree)
 424                         hfsplus_delete_all_attrs(dir, cnid);
 425         }
 426
 427 out:
 428         hfs_find_exit(&fd);
 429
 430         return err;
 431 }
 432
 433 int hfsplus_rename_cat(u32 cnid,
 434                        struct inode *src_dir, const struct qstr *src_name,
 435                        struct inode *dst_dir, const struct qstr *dst_name)
 436 {
 437         struct super_block *sb = src_dir->i_sb;
 438         struct hfs_find_data src_fd, dst_fd;
 439         hfsplus_cat_entry entry;
 440         int entry_size, type;
 441         int err;
 442
 443         hfs_dbg(CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n",
 444                 cnid, src_dir->i_ino, src_name->name,
 445                 dst_dir->i_ino, dst_name->name);
 446         err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &src_fd);
 447         if (err)
 448                 return err;
 449         dst_fd = src_fd;
 450
 451         /*
 452          * Fail early and avoid ENOSPC during the btree operations. We may
 453          * have to split the root node at most twice.
 454          */
 455         err = hfs_bmap_reserve(src_fd.tree, 4 * (int)src_fd.tree->depth - 1);
 456         if (err)
 457                 goto out;
 458
 459         /* find the old dir entry and read the data */
 460         err = hfsplus_cat_build_key(sb, src_fd.search_key,
 461                         src_dir->i_ino, src_name);
 462         if (unlikely(err))
 463                 goto out;
 464
 465         err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
 466         if (err)
 467                 goto out;
 468         if (src_fd.entrylength > sizeof(entry) || src_fd.entrylength < 0) {
 469                 err = -EIO;
 470                 goto out;
 471         }
 472
 473         hfs_bnode_read(src_fd.bnode, &entry, src_fd.entryoffset,
 474                                 src_fd.entrylength);
 475         type = be16_to_cpu(entry.type);
 476
 477         /* create new dir entry with the data from the old entry */
 478         err = hfsplus_cat_build_key(sb, dst_fd.search_key,
 479                         dst_dir->i_ino, dst_name);
 480         if (unlikely(err))
 481                 goto out;
 482
 483         err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
 484         if (err != -ENOENT) {
 485                 if (!err)
 486                         err = -EEXIST;
 487                 goto out;
 488         }
 489
 490         err = hfs_brec_insert(&dst_fd, &entry, src_fd.entrylength);
 491         if (err)
 492                 goto out;
 493         dst_dir->i_size++;
 494         if (type == HFSPLUS_FOLDER)
 495                 hfsplus_subfolders_inc(dst_dir);
 496         dst_dir->i_mtime = dst_dir->i_ctime = current_time(dst_dir);
 497
 498         /* finally remove the old entry */
 499         err = hfsplus_cat_build_key(sb, src_fd.search_key,
 500                         src_dir->i_ino, src_name);
 501         if (unlikely(err))
 502                 goto out;
 503
 504         err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
 505         if (err)
 506                 goto out;
 507         err = hfs_brec_remove(&src_fd);
 508         if (err)
 509                 goto out;
 510         src_dir->i_size--;
 511         if (type == HFSPLUS_FOLDER)
 512                 hfsplus_subfolders_dec(src_dir);
 513         src_dir->i_mtime = src_dir->i_ctime = current_time(src_dir);
 514
 515         /* remove old thread entry */
 516         hfsplus_cat_build_key_with_cnid(sb, src_fd.search_key, cnid);
 517         err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
 518         if (err)
 519                 goto out;
 520         type = hfs_bnode_read_u16(src_fd.bnode, src_fd.entryoffset);
 521         err = hfs_brec_remove(&src_fd);
 522         if (err)
 523                 goto out;
 524
 525         /* create new thread entry */
 526         hfsplus_cat_build_key_with_cnid(sb, dst_fd.search_key, cnid);
 527         entry_size = hfsplus_fill_cat_thread(sb, &entry, type,
 528                 dst_dir->i_ino, dst_name);
 529         if (unlikely(entry_size < 0)) {
 530                 err = entry_size;
 531                 goto out;
 532         }
 533
 534         err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
 535         if (err != -ENOENT) {
 536                 if (!err)
 537                         err = -EEXIST;
 538                 goto out;
 539         }
 540         err = hfs_brec_insert(&dst_fd, &entry, entry_size);
 541
 542         hfsplus_mark_inode_dirty(dst_dir, HFSPLUS_I_CAT_DIRTY);
 543         hfsplus_mark_inode_dirty(src_dir, HFSPLUS_I_CAT_DIRTY);
 544 out:
 545         hfs_bnode_put(dst_fd.bnode);
 546         hfs_find_exit(&src_fd);
 547         return err;
 548 }