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