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