LXR linux/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
  15int 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
  28int 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
  41void 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, HFSPLUS_MAX_STRLEN,
  49                                        str->name, str->len);
  50                len = be16_to_cpu(key->cat.name.length);
  51        } else {
  52                key->cat.name.length = 0;
  53                len = 0;
  54        }
  55        key->key_len = cpu_to_be16(6 + 2 * len);
  56}
  57
  58static void hfsplus_cat_build_key_uni(hfsplus_btree_key *key, u32 parent,
  59                                      struct hfsplus_unistr *name)
  60{
  61        int ustrlen;
  62
  63        ustrlen = be16_to_cpu(name->length);
  64        key->cat.parent = cpu_to_be32(parent);
  65        key->cat.name.length = cpu_to_be16(ustrlen);
  66        ustrlen *= 2;
  67        memcpy(key->cat.name.unicode, name->unicode, ustrlen);
  68        key->key_len = cpu_to_be16(6 + ustrlen);
  69}
  70
  71void hfsplus_cat_set_perms(struct inode *inode, struct hfsplus_perm *perms)
  72{
  73        if (inode->i_flags & S_IMMUTABLE)
  74                perms->rootflags |= HFSPLUS_FLG_IMMUTABLE;
  75        else
  76                perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
  77        if (inode->i_flags & S_APPEND)
  78                perms->rootflags |= HFSPLUS_FLG_APPEND;
  79        else
  80                perms->rootflags &= ~HFSPLUS_FLG_APPEND;
  81
  82        perms->userflags = HFSPLUS_I(inode)->userflags;
  83        perms->mode = cpu_to_be16(inode->i_mode);
  84        perms->owner = cpu_to_be32(i_uid_read(inode));
  85        perms->group = cpu_to_be32(i_gid_read(inode));
  86
  87        if (S_ISREG(inode->i_mode))
  88                perms->dev = cpu_to_be32(inode->i_nlink);
  89        else if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode))
  90                perms->dev = cpu_to_be32(inode->i_rdev);
  91        else
  92                perms->dev = 0;
  93}
  94
  95static int hfsplus_cat_build_record(hfsplus_cat_entry *entry,
  96                u32 cnid, struct inode *inode)
  97{
  98        struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
  99
 100        if (S_ISDIR(inode->i_mode)) {
 101                struct hfsplus_cat_folder *folder;
 102
 103                folder = &entry->folder;
 104                memset(folder, 0, sizeof(*folder));
 105                folder->type = cpu_to_be16(HFSPLUS_FOLDER);
 106                if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags))
 107                        folder->flags |= cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT);
 108                folder->id = cpu_to_be32(inode->i_ino);
 109                HFSPLUS_I(inode)->create_date =
 110                        folder->create_date =
 111                        folder->content_mod_date =
 112                        folder->attribute_mod_date =
 113                        folder->access_date = hfsp_now2mt();
 114                hfsplus_cat_set_perms(inode, &folder->permissions);
 115                if (inode == sbi->hidden_dir)
 116                        /* invisible and namelocked */
 117                        folder->user_info.frFlags = cpu_to_be16(0x5000);
 118                return sizeof(*folder);
 119        } else {
 120                struct hfsplus_cat_file *file;
 121
 122                file = &entry->file;
 123                memset(file, 0, sizeof(*file));
 124                file->type = cpu_to_be16(HFSPLUS_FILE);
 125                file->flags = cpu_to_be16(HFSPLUS_FILE_THREAD_EXISTS);
 126                file->id = cpu_to_be32(cnid);
 127                HFSPLUS_I(inode)->create_date =
 128                        file->create_date =
 129                        file->content_mod_date =
 130                        file->attribute_mod_date =
 131                        file->access_date = hfsp_now2mt();
 132                if (cnid == inode->i_ino) {
 133                        hfsplus_cat_set_perms(inode, &file->permissions);
 134                        if (S_ISLNK(inode->i_mode)) {
 135                                file->user_info.fdType =
 136                                        cpu_to_be32(HFSP_SYMLINK_TYPE);
 137                                file->user_info.fdCreator =
 138                                        cpu_to_be32(HFSP_SYMLINK_CREATOR);
 139                        } else {
 140                                file->user_info.fdType =
 141                                        cpu_to_be32(sbi->type);
 142                                file->user_info.fdCreator =
 143                                        cpu_to_be32(sbi->creator);
 144                        }
 145                        if (HFSPLUS_FLG_IMMUTABLE &
 146                                        (file->permissions.rootflags |
 147                                        file->permissions.userflags))
 148                                file->flags |=
 149                                        cpu_to_be16(HFSPLUS_FILE_LOCKED);
 150                } else {
 151                        file->user_info.fdType =
 152                                cpu_to_be32(HFSP_HARDLINK_TYPE);
 153                        file->user_info.fdCreator =
 154                                cpu_to_be32(HFSP_HFSPLUS_CREATOR);
 155                        file->user_info.fdFlags =
 156                                cpu_to_be16(0x100);
 157                        file->create_date =
 158                                HFSPLUS_I(sbi->hidden_dir)->create_date;
 159                        file->permissions.dev =
 160                                cpu_to_be32(HFSPLUS_I(inode)->linkid);
 161                }
 162                return sizeof(*file);
 163        }
 164}
 165
 166static int hfsplus_fill_cat_thread(struct super_block *sb,
 167                                   hfsplus_cat_entry *entry, int type,
 168                                   u32 parentid, struct qstr *str)
 169{
 170        entry->type = cpu_to_be16(type);
 171        entry->thread.reserved = 0;
 172        entry->thread.parentID = cpu_to_be32(parentid);
 173        hfsplus_asc2uni(sb, &entry->thread.nodeName, HFSPLUS_MAX_STRLEN,
 174                                str->name, str->len);
 175        return 10 + be16_to_cpu(entry->thread.nodeName.length) * 2;
 176}
 177
 178/* Try to get a catalog entry for given catalog id */
 179int hfsplus_find_cat(struct super_block *sb, u32 cnid,
 180                     struct hfs_find_data *fd)
 181{
 182        hfsplus_cat_entry tmp;
 183        int err;
 184        u16 type;
 185
 186        hfsplus_cat_build_key(sb, fd->search_key, cnid, NULL);
 187        err = hfs_brec_read(fd, &tmp, sizeof(hfsplus_cat_entry));
 188        if (err)
 189                return err;
 190
 191        type = be16_to_cpu(tmp.type);
 192        if (type != HFSPLUS_FOLDER_THREAD && type != HFSPLUS_FILE_THREAD) {
 193                pr_err("found bad thread record in catalog\n");
 194                return -EIO;
 195        }
 196
 197        if (be16_to_cpu(tmp.thread.nodeName.length) > 255) {
 198                pr_err("catalog name length corrupted\n");
 199                return -EIO;
 200        }
 201
 202        hfsplus_cat_build_key_uni(fd->search_key,
 203                be32_to_cpu(tmp.thread.parentID),
 204                &tmp.thread.nodeName);
 205        return hfs_brec_find(fd, hfs_find_rec_by_key);
 206}
 207
 208static void hfsplus_subfolders_inc(struct inode *dir)
 209{
 210        struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
 211
 212        if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags)) {
 213                /*
 214                 * Increment subfolder count. Note, the value is only meaningful
 215                 * for folders with HFSPLUS_HAS_FOLDER_COUNT flag set.
 216                 */
 217                HFSPLUS_I(dir)->subfolders++;
 218        }
 219}
 220
 221static void hfsplus_subfolders_dec(struct inode *dir)
 222{
 223        struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
 224
 225        if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags)) {
 226                /*
 227                 * Decrement subfolder count. Note, the value is only meaningful
 228                 * for folders with HFSPLUS_HAS_FOLDER_COUNT flag set.
 229                 *
 230                 * Check for zero. Some subfolders may have been created
 231                 * by an implementation ignorant of this counter.
 232                 */
 233                if (HFSPLUS_I(dir)->subfolders)
 234                        HFSPLUS_I(dir)->subfolders--;
 235        }
 236}
 237
 238int hfsplus_create_cat(u32 cnid, struct inode *dir,
 239                struct qstr *str, struct inode *inode)
 240{
 241        struct super_block *sb = dir->i_sb;
 242        struct hfs_find_data fd;
 243        hfsplus_cat_entry entry;
 244        int entry_size;
 245        int err;
 246
 247        hfs_dbg(CAT_MOD, "create_cat: %s,%u(%d)\n",
 248                str->name, cnid, inode->i_nlink);
 249        err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
 250        if (err)
 251                return err;
 252
 253        hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
 254        entry_size = hfsplus_fill_cat_thread(sb, &entry,
 255                S_ISDIR(inode->i_mode) ?
 256                        HFSPLUS_FOLDER_THREAD : HFSPLUS_FILE_THREAD,
 257                dir->i_ino, str);
 258        err = hfs_brec_find(&fd, hfs_find_rec_by_key);
 259        if (err != -ENOENT) {
 260                if (!err)
 261                        err = -EEXIST;
 262                goto err2;
 263        }
 264        err = hfs_brec_insert(&fd, &entry, entry_size);
 265        if (err)
 266                goto err2;
 267
 268        hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
 269        entry_size = hfsplus_cat_build_record(&entry, cnid, inode);
 270        err = hfs_brec_find(&fd, hfs_find_rec_by_key);
 271        if (err != -ENOENT) {
 272                /* panic? */
 273                if (!err)
 274                        err = -EEXIST;
 275                goto err1;
 276        }
 277        err = hfs_brec_insert(&fd, &entry, entry_size);
 278        if (err)
 279                goto err1;
 280
 281        dir->i_size++;
 282        if (S_ISDIR(inode->i_mode))
 283                hfsplus_subfolders_inc(dir);
 284        dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
 285        hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
 286
 287        hfs_find_exit(&fd);
 288        return 0;
 289
 290err1:
 291        hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
 292        if (!hfs_brec_find(&fd, hfs_find_rec_by_key))
 293                hfs_brec_remove(&fd);
 294err2:
 295        hfs_find_exit(&fd);
 296        return err;
 297}
 298
 299int hfsplus_delete_cat(u32 cnid, struct inode *dir, struct qstr *str)
 300{
 301        struct super_block *sb = dir->i_sb;
 302        struct hfs_find_data fd;
 303        struct hfsplus_fork_raw fork;
 304        struct list_head *pos;
 305        int err, off;
 306        u16 type;
 307
 308        hfs_dbg(CAT_MOD, "delete_cat: %s,%u\n", str ? str->name : NULL, cnid);
 309        err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
 310        if (err)
 311                return err;
 312
 313        if (!str) {
 314                int len;
 315
 316                hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
 317                err = hfs_brec_find(&fd, hfs_find_rec_by_key);
 318                if (err)
 319                        goto out;
 320
 321                off = fd.entryoffset +
 322                        offsetof(struct hfsplus_cat_thread, nodeName);
 323                fd.search_key->cat.parent = cpu_to_be32(dir->i_ino);
 324                hfs_bnode_read(fd.bnode,
 325                        &fd.search_key->cat.name.length, off, 2);
 326                len = be16_to_cpu(fd.search_key->cat.name.length) * 2;
 327                hfs_bnode_read(fd.bnode,
 328                        &fd.search_key->cat.name.unicode,
 329                        off + 2, len);
 330                fd.search_key->key_len = cpu_to_be16(6 + len);
 331        } else
 332                hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
 333
 334        err = hfs_brec_find(&fd, hfs_find_rec_by_key);
 335        if (err)
 336                goto out;
 337
 338        type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
 339        if (type == HFSPLUS_FILE) {
 340#if 0
 341                off = fd.entryoffset + offsetof(hfsplus_cat_file, data_fork);
 342                hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
 343                hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_DATA);
 344#endif
 345
 346                off = fd.entryoffset +
 347                        offsetof(struct hfsplus_cat_file, rsrc_fork);
 348                hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
 349                hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_RSRC);
 350        }
 351
 352        list_for_each(pos, &HFSPLUS_I(dir)->open_dir_list) {
 353                struct hfsplus_readdir_data *rd =
 354                        list_entry(pos, struct hfsplus_readdir_data, list);
 355                if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
 356                        rd->file->f_pos--;
 357        }
 358
 359        err = hfs_brec_remove(&fd);
 360        if (err)
 361                goto out;
 362
 363        hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
 364        err = hfs_brec_find(&fd, hfs_find_rec_by_key);
 365        if (err)
 366                goto out;
 367
 368        err = hfs_brec_remove(&fd);
 369        if (err)
 370                goto out;
 371
 372        dir->i_size--;
 373        if (type == HFSPLUS_FOLDER)
 374                hfsplus_subfolders_dec(dir);
 375        dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
 376        hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
 377
 378        if (type == HFSPLUS_FILE || type == HFSPLUS_FOLDER) {
 379                if (HFSPLUS_SB(sb)->attr_tree)
 380                        hfsplus_delete_all_attrs(dir, cnid);
 381        }
 382
 383out:
 384        hfs_find_exit(&fd);
 385
 386        return err;
 387}
 388
 389int hfsplus_rename_cat(u32 cnid,
 390                       struct inode *src_dir, struct qstr *src_name,
 391                       struct inode *dst_dir, struct qstr *dst_name)
 392{
 393        struct super_block *sb = src_dir->i_sb;
 394        struct hfs_find_data src_fd, dst_fd;
 395        hfsplus_cat_entry entry;
 396        int entry_size, type;
 397        int err;
 398
 399        hfs_dbg(CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n",
 400                cnid, src_dir->i_ino, src_name->name,
 401                dst_dir->i_ino, dst_name->name);
 402        err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &src_fd);
 403        if (err)
 404                return err;
 405        dst_fd = src_fd;
 406
 407        /* find the old dir entry and read the data */
 408        hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
 409        err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
 410        if (err)
 411                goto out;
 412        if (src_fd.entrylength > sizeof(entry) || src_fd.entrylength < 0) {
 413                err = -EIO;
 414                goto out;
 415        }
 416
 417        hfs_bnode_read(src_fd.bnode, &entry, src_fd.entryoffset,
 418                                src_fd.entrylength);
 419        type = be16_to_cpu(entry.type);
 420
 421        /* create new dir entry with the data from the old entry */
 422        hfsplus_cat_build_key(sb, dst_fd.search_key, dst_dir->i_ino, dst_name);
 423        err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
 424        if (err != -ENOENT) {
 425                if (!err)
 426                        err = -EEXIST;
 427                goto out;
 428        }
 429
 430        err = hfs_brec_insert(&dst_fd, &entry, src_fd.entrylength);
 431        if (err)
 432                goto out;
 433        dst_dir->i_size++;
 434        if (type == HFSPLUS_FOLDER)
 435                hfsplus_subfolders_inc(dst_dir);
 436        dst_dir->i_mtime = dst_dir->i_ctime = CURRENT_TIME_SEC;
 437
 438        /* finally remove the old entry */
 439        hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
 440        err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
 441        if (err)
 442                goto out;
 443        err = hfs_brec_remove(&src_fd);
 444        if (err)
 445                goto out;
 446        src_dir->i_size--;
 447        if (type == HFSPLUS_FOLDER)
 448                hfsplus_subfolders_dec(src_dir);
 449        src_dir->i_mtime = src_dir->i_ctime = CURRENT_TIME_SEC;
 450
 451        /* remove old thread entry */
 452        hfsplus_cat_build_key(sb, src_fd.search_key, cnid, NULL);
 453        err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
 454        if (err)
 455                goto out;
 456        type = hfs_bnode_read_u16(src_fd.bnode, src_fd.entryoffset);
 457        err = hfs_brec_remove(&src_fd);
 458        if (err)
 459                goto out;
 460
 461        /* create new thread entry */
 462        hfsplus_cat_build_key(sb, dst_fd.search_key, cnid, NULL);
 463        entry_size = hfsplus_fill_cat_thread(sb, &entry, type,
 464                dst_dir->i_ino, dst_name);
 465        err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
 466        if (err != -ENOENT) {
 467                if (!err)
 468                        err = -EEXIST;
 469                goto out;
 470        }
 471        err = hfs_brec_insert(&dst_fd, &entry, entry_size);
 472
 473        hfsplus_mark_inode_dirty(dst_dir, HFSPLUS_I_CAT_DIRTY);
 474        hfsplus_mark_inode_dirty(src_dir, HFSPLUS_I_CAT_DIRTY);
 475out:
 476        hfs_bnode_put(dst_fd.bnode);
 477        hfs_find_exit(&src_fd);
 478        return err;
 479}
 480