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