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