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         if (be16_to_cpu(tmp.thread.nodeName.length) > 255) {
 172                 printk(KERN_ERR "hfs: catalog name length corrupted\n");
 173                 return -EIO;
 174         }
 175
 176         hfsplus_cat_build_key_uni(fd->search_key, be32_to_cpu(tmp.thread.parentID),
 177                                  &tmp.thread.nodeName);
 178         return hfs_brec_find(fd);
 179 }
 180
 181 int hfsplus_create_cat(u32 cnid, struct inode *dir, struct qstr *str, struct inode *inode)
 182 {
 183         struct hfs_find_data fd;
 184         struct super_block *sb;
 185         hfsplus_cat_entry entry;
 186         int entry_size;
 187         int err;
 188
 189         dprint(DBG_CAT_MOD, "create_cat: %s,%u(%d)\n", str->name, cnid, inode->i_nlink);
 190         sb = dir->i_sb;
 191         hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
 192
 193         hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
 194         entry_size = hfsplus_fill_cat_thread(sb, &entry, S_ISDIR(inode->i_mode) ?
 195                         HFSPLUS_FOLDER_THREAD : HFSPLUS_FILE_THREAD,
 196                         dir->i_ino, str);
 197         err = hfs_brec_find(&fd);
 198         if (err != -ENOENT) {
 199                 if (!err)
 200                         err = -EEXIST;
 201                 goto err2;
 202         }
 203         err = hfs_brec_insert(&fd, &entry, entry_size);
 204         if (err)
 205                 goto err2;
 206
 207         hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
 208         entry_size = hfsplus_cat_build_record(&entry, cnid, inode);
 209         err = hfs_brec_find(&fd);
 210         if (err != -ENOENT) {
 211                 /* panic? */
 212                 if (!err)
 213                         err = -EEXIST;
 214                 goto err1;
 215         }
 216         err = hfs_brec_insert(&fd, &entry, entry_size);
 217         if (err)
 218                 goto err1;
 219
 220         dir->i_size++;
 221         dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
 222         mark_inode_dirty(dir);
 223         hfs_find_exit(&fd);
 224         return 0;
 225
 226 err1:
 227         hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
 228         if (!hfs_brec_find(&fd))
 229                 hfs_brec_remove(&fd);
 230 err2:
 231         hfs_find_exit(&fd);
 232         return err;
 233 }
 234
 235 int hfsplus_delete_cat(u32 cnid, struct inode *dir, struct qstr *str)
 236 {
 237         struct super_block *sb;
 238         struct hfs_find_data fd;
 239         struct hfsplus_fork_raw fork;
 240         struct list_head *pos;
 241         int err, off;
 242         u16 type;
 243
 244         dprint(DBG_CAT_MOD, "delete_cat: %s,%u\n", str ? str->name : NULL, cnid);
 245         sb = dir->i_sb;
 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;
 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         sb = src_dir->i_sb;
 324         hfs_find_init(HFSPLUS_SB(sb).cat_tree, &src_fd);
 325         dst_fd = src_fd;
 326
 327         /* find the old dir entry and read the data */
 328         hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
 329         err = hfs_brec_find(&src_fd);
 330         if (err)
 331                 goto out;
 332
 333         hfs_bnode_read(src_fd.bnode, &entry, src_fd.entryoffset,
 334                                 src_fd.entrylength);
 335
 336         /* create new dir entry with the data from the old entry */
 337         hfsplus_cat_build_key(sb, dst_fd.search_key, dst_dir->i_ino, dst_name);
 338         err = hfs_brec_find(&dst_fd);
 339         if (err != -ENOENT) {
 340                 if (!err)
 341                         err = -EEXIST;
 342                 goto out;
 343         }
 344
 345         err = hfs_brec_insert(&dst_fd, &entry, src_fd.entrylength);
 346         if (err)
 347                 goto out;
 348         dst_dir->i_size++;
 349         dst_dir->i_mtime = dst_dir->i_ctime = CURRENT_TIME_SEC;
 350         mark_inode_dirty(dst_dir);
 351
 352         /* finally remove the old entry */
 353         hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
 354         err = hfs_brec_find(&src_fd);
 355         if (err)
 356                 goto out;
 357         err = hfs_brec_remove(&src_fd);
 358         if (err)
 359                 goto out;
 360         src_dir->i_size--;
 361         src_dir->i_mtime = src_dir->i_ctime = CURRENT_TIME_SEC;
 362         mark_inode_dirty(src_dir);
 363
 364         /* remove old thread entry */
 365         hfsplus_cat_build_key(sb, src_fd.search_key, cnid, NULL);
 366         err = hfs_brec_find(&src_fd);
 367         if (err)
 368                 goto out;
 369         type = hfs_bnode_read_u16(src_fd.bnode, src_fd.entryoffset);
 370         err = hfs_brec_remove(&src_fd);
 371         if (err)
 372                 goto out;
 373
 374         /* create new thread entry */
 375         hfsplus_cat_build_key(sb, dst_fd.search_key, cnid, NULL);
 376         entry_size = hfsplus_fill_cat_thread(sb, &entry, type, dst_dir->i_ino, dst_name);
 377         err = hfs_brec_find(&dst_fd);
 378         if (err != -ENOENT) {
 379                 if (!err)
 380                         err = -EEXIST;
 381                 goto out;
 382         }
 383         err = hfs_brec_insert(&dst_fd, &entry, entry_size);
 384 out:
 385         hfs_bnode_put(dst_fd.bnode);
 386         hfs_find_exit(&src_fd);
 387         return err;
 388 }