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                 folder->id = cpu_to_be32(inode->i_ino);
 107                 HFSPLUS_I(inode)->create_date =
 108                         folder->create_date =
 109                         folder->content_mod_date =
 110                         folder->attribute_mod_date =
 111                         folder->access_date = hfsp_now2mt();
 112                 hfsplus_cat_set_perms(inode, &folder->permissions);
 113                 if (inode == sbi->hidden_dir)
 114                         /* invisible and namelocked */
 115                         folder->user_info.frFlags = cpu_to_be16(0x5000);
 116                 return sizeof(*folder);
 117         } else {
 118                 struct hfsplus_cat_file *file;
 119
 120                 file = &entry->file;
 121                 memset(file, 0, sizeof(*file));
 122                 file->type = cpu_to_be16(HFSPLUS_FILE);
 123                 file->flags = cpu_to_be16(HFSPLUS_FILE_THREAD_EXISTS);
 124                 file->id = cpu_to_be32(cnid);
 125                 HFSPLUS_I(inode)->create_date =
 126                         file->create_date =
 127                         file->content_mod_date =
 128                         file->attribute_mod_date =
 129                         file->access_date = hfsp_now2mt();
 130                 if (cnid == inode->i_ino) {
 131                         hfsplus_cat_set_perms(inode, &file->permissions);
 132                         if (S_ISLNK(inode->i_mode)) {
 133                                 file->user_info.fdType =
 134                                         cpu_to_be32(HFSP_SYMLINK_TYPE);
 135                                 file->user_info.fdCreator =
 136                                         cpu_to_be32(HFSP_SYMLINK_CREATOR);
 137                         } else {
 138                                 file->user_info.fdType =
 139                                         cpu_to_be32(sbi->type);
 140                                 file->user_info.fdCreator =
 141                                         cpu_to_be32(sbi->creator);
 142                         }
 143                         if (HFSPLUS_FLG_IMMUTABLE &
 144                                         (file->permissions.rootflags |
 145                                         file->permissions.userflags))
 146                                 file->flags |=
 147                                         cpu_to_be16(HFSPLUS_FILE_LOCKED);
 148                 } else {
 149                         file->user_info.fdType =
 150                                 cpu_to_be32(HFSP_HARDLINK_TYPE);
 151                         file->user_info.fdCreator =
 152                                 cpu_to_be32(HFSP_HFSPLUS_CREATOR);
 153                         file->user_info.fdFlags =
 154                                 cpu_to_be16(0x100);
 155                         file->create_date =
 156                                 HFSPLUS_I(sbi->hidden_dir)->create_date;
 157                         file->permissions.dev =
 158                                 cpu_to_be32(HFSPLUS_I(inode)->linkid);
 159                 }
 160                 return sizeof(*file);
 161         }
 162 }
 163
 164 static int hfsplus_fill_cat_thread(struct super_block *sb,
 165                                    hfsplus_cat_entry *entry, int type,
 166                                    u32 parentid, struct qstr *str)
 167 {
 168         entry->type = cpu_to_be16(type);
 169         entry->thread.reserved = 0;
 170         entry->thread.parentID = cpu_to_be32(parentid);
 171         hfsplus_asc2uni(sb, &entry->thread.nodeName, HFSPLUS_MAX_STRLEN,
 172                                 str->name, str->len);
 173         return 10 + be16_to_cpu(entry->thread.nodeName.length) * 2;
 174 }
 175
 176 /* Try to get a catalog entry for given catalog id */
 177 int hfsplus_find_cat(struct super_block *sb, u32 cnid,
 178                      struct hfs_find_data *fd)
 179 {
 180         hfsplus_cat_entry tmp;
 181         int err;
 182         u16 type;
 183
 184         hfsplus_cat_build_key(sb, fd->search_key, cnid, NULL);
 185         err = hfs_brec_read(fd, &tmp, sizeof(hfsplus_cat_entry));
 186         if (err)
 187                 return err;
 188
 189         type = be16_to_cpu(tmp.type);
 190         if (type != HFSPLUS_FOLDER_THREAD && type != HFSPLUS_FILE_THREAD) {
 191                 pr_err("found bad thread record in catalog\n");
 192                 return -EIO;
 193         }
 194
 195         if (be16_to_cpu(tmp.thread.nodeName.length) > 255) {
 196                 pr_err("catalog name length corrupted\n");
 197                 return -EIO;
 198         }
 199
 200         hfsplus_cat_build_key_uni(fd->search_key,
 201                 be32_to_cpu(tmp.thread.parentID),
 202                 &tmp.thread.nodeName);
 203         return hfs_brec_find(fd, hfs_find_rec_by_key);
 204 }
 205
 206 int hfsplus_create_cat(u32 cnid, struct inode *dir,
 207                 struct qstr *str, struct inode *inode)
 208 {
 209         struct super_block *sb = dir->i_sb;
 210         struct hfs_find_data fd;
 211         hfsplus_cat_entry entry;
 212         int entry_size;
 213         int err;
 214
 215         hfs_dbg(CAT_MOD, "create_cat: %s,%u(%d)\n",
 216                 str->name, cnid, inode->i_nlink);
 217         err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
 218         if (err)
 219                 return err;
 220
 221         hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
 222         entry_size = hfsplus_fill_cat_thread(sb, &entry,
 223                 S_ISDIR(inode->i_mode) ?
 224                         HFSPLUS_FOLDER_THREAD : HFSPLUS_FILE_THREAD,
 225                 dir->i_ino, str);
 226         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
 227         if (err != -ENOENT) {
 228                 if (!err)
 229                         err = -EEXIST;
 230                 goto err2;
 231         }
 232         err = hfs_brec_insert(&fd, &entry, entry_size);
 233         if (err)
 234                 goto err2;
 235
 236         hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
 237         entry_size = hfsplus_cat_build_record(&entry, cnid, inode);
 238         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
 239         if (err != -ENOENT) {
 240                 /* panic? */
 241                 if (!err)
 242                         err = -EEXIST;
 243                 goto err1;
 244         }
 245         err = hfs_brec_insert(&fd, &entry, entry_size);
 246         if (err)
 247                 goto err1;
 248
 249         dir->i_size++;
 250         dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
 251         hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
 252
 253         hfs_find_exit(&fd);
 254         return 0;
 255
 256 err1:
 257         hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
 258         if (!hfs_brec_find(&fd, hfs_find_rec_by_key))
 259                 hfs_brec_remove(&fd);
 260 err2:
 261         hfs_find_exit(&fd);
 262         return err;
 263 }
 264
 265 int hfsplus_delete_cat(u32 cnid, struct inode *dir, struct qstr *str)
 266 {
 267         struct super_block *sb = dir->i_sb;
 268         struct hfs_find_data fd;
 269         struct hfsplus_fork_raw fork;
 270         struct list_head *pos;
 271         int err, off;
 272         u16 type;
 273
 274         hfs_dbg(CAT_MOD, "delete_cat: %s,%u\n", str ? str->name : NULL, cnid);
 275         err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
 276         if (err)
 277                 return err;
 278
 279         if (!str) {
 280                 int len;
 281
 282                 hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
 283                 err = hfs_brec_find(&fd, hfs_find_rec_by_key);
 284                 if (err)
 285                         goto out;
 286
 287                 off = fd.entryoffset +
 288                         offsetof(struct hfsplus_cat_thread, nodeName);
 289                 fd.search_key->cat.parent = cpu_to_be32(dir->i_ino);
 290                 hfs_bnode_read(fd.bnode,
 291                         &fd.search_key->cat.name.length, off, 2);
 292                 len = be16_to_cpu(fd.search_key->cat.name.length) * 2;
 293                 hfs_bnode_read(fd.bnode,
 294                         &fd.search_key->cat.name.unicode,
 295                         off + 2, len);
 296                 fd.search_key->key_len = cpu_to_be16(6 + len);
 297         } else
 298                 hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
 299
 300         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
 301         if (err)
 302                 goto out;
 303
 304         type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
 305         if (type == HFSPLUS_FILE) {
 306 #if 0
 307                 off = fd.entryoffset + offsetof(hfsplus_cat_file, data_fork);
 308                 hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
 309                 hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_DATA);
 310 #endif
 311
 312                 off = fd.entryoffset +
 313                         offsetof(struct hfsplus_cat_file, rsrc_fork);
 314                 hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
 315                 hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_RSRC);
 316         }
 317
 318         list_for_each(pos, &HFSPLUS_I(dir)->open_dir_list) {
 319                 struct hfsplus_readdir_data *rd =
 320                         list_entry(pos, struct hfsplus_readdir_data, list);
 321                 if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
 322                         rd->file->f_pos--;
 323         }
 324
 325         err = hfs_brec_remove(&fd);
 326         if (err)
 327                 goto out;
 328
 329         hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
 330         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
 331         if (err)
 332                 goto out;
 333
 334         err = hfs_brec_remove(&fd);
 335         if (err)
 336                 goto out;
 337
 338         dir->i_size--;
 339         dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
 340         hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
 341
 342         if (type == HFSPLUS_FILE || type == HFSPLUS_FOLDER) {
 343                 if (HFSPLUS_SB(sb)->attr_tree)
 344                         hfsplus_delete_all_attrs(dir, cnid);
 345         }
 346
 347 out:
 348         hfs_find_exit(&fd);
 349
 350         return err;
 351 }
 352
 353 int hfsplus_rename_cat(u32 cnid,
 354                        struct inode *src_dir, struct qstr *src_name,
 355                        struct inode *dst_dir, struct qstr *dst_name)
 356 {
 357         struct super_block *sb = src_dir->i_sb;
 358         struct hfs_find_data src_fd, dst_fd;
 359         hfsplus_cat_entry entry;
 360         int entry_size, type;
 361         int err;
 362
 363         hfs_dbg(CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n",
 364                 cnid, src_dir->i_ino, src_name->name,
 365                 dst_dir->i_ino, dst_name->name);
 366         err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &src_fd);
 367         if (err)
 368                 return err;
 369         dst_fd = src_fd;
 370
 371         /* find the old dir entry and read the data */
 372         hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
 373         err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
 374         if (err)
 375                 goto out;
 376         if (src_fd.entrylength > sizeof(entry) || src_fd.entrylength < 0) {
 377                 err = -EIO;
 378                 goto out;
 379         }
 380
 381         hfs_bnode_read(src_fd.bnode, &entry, src_fd.entryoffset,
 382                                 src_fd.entrylength);
 383
 384         /* create new dir entry with the data from the old entry */
 385         hfsplus_cat_build_key(sb, dst_fd.search_key, dst_dir->i_ino, dst_name);
 386         err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
 387         if (err != -ENOENT) {
 388                 if (!err)
 389                         err = -EEXIST;
 390                 goto out;
 391         }
 392
 393         err = hfs_brec_insert(&dst_fd, &entry, src_fd.entrylength);
 394         if (err)
 395                 goto out;
 396         dst_dir->i_size++;
 397         dst_dir->i_mtime = dst_dir->i_ctime = CURRENT_TIME_SEC;
 398
 399         /* finally remove the old entry */
 400         hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
 401         err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
 402         if (err)
 403                 goto out;
 404         err = hfs_brec_remove(&src_fd);
 405         if (err)
 406                 goto out;
 407         src_dir->i_size--;
 408         src_dir->i_mtime = src_dir->i_ctime = CURRENT_TIME_SEC;
 409
 410         /* remove old thread entry */
 411         hfsplus_cat_build_key(sb, src_fd.search_key, cnid, NULL);
 412         err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
 413         if (err)
 414                 goto out;
 415         type = hfs_bnode_read_u16(src_fd.bnode, src_fd.entryoffset);
 416         err = hfs_brec_remove(&src_fd);
 417         if (err)
 418                 goto out;
 419
 420         /* create new thread entry */
 421         hfsplus_cat_build_key(sb, dst_fd.search_key, cnid, NULL);
 422         entry_size = hfsplus_fill_cat_thread(sb, &entry, type,
 423                 dst_dir->i_ino, dst_name);
 424         err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
 425         if (err != -ENOENT) {
 426                 if (!err)
 427                         err = -EEXIST;
 428                 goto out;
 429         }
 430         err = hfs_brec_insert(&dst_fd, &entry, entry_size);
 431
 432         hfsplus_mark_inode_dirty(dst_dir, HFSPLUS_I_CAT_DIRTY);
 433         hfsplus_mark_inode_dirty(src_dir, HFSPLUS_I_CAT_DIRTY);
 434 out:
 435         hfs_bnode_put(dst_fd.bnode);
 436         hfs_find_exit(&src_fd);
 437         return err;
 438 }