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