linux/fs/hfsplus/catalog.c
<<
>>
Prefs
   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                folder->id = cpu_to_be32(inode->i_ino);
 107                HFSPLUS_I(inode)->create_date =
 108                        folder->create_date =
 109                        folder->content_mod_date =
 110                        folder->attribute_mod_date =
 111                        folder->access_date = hfsp_now2mt();
 112                hfsplus_cat_set_perms(inode, &folder->permissions);
 113                if (inode == sbi->hidden_dir)
 114                        /* invisible and namelocked */
 115                        folder->user_info.frFlags = cpu_to_be16(0x5000);
 116                return sizeof(*folder);
 117        } else {
 118                struct hfsplus_cat_file *file;
 119
 120                file = &entry->file;
 121                memset(file, 0, sizeof(*file));
 122                file->type = cpu_to_be16(HFSPLUS_FILE);
 123                file->flags = cpu_to_be16(HFSPLUS_FILE_THREAD_EXISTS);
 124                file->id = cpu_to_be32(cnid);
 125                HFSPLUS_I(inode)->create_date =
 126                        file->create_date =
 127                        file->content_mod_date =
 128                        file->attribute_mod_date =
 129                        file->access_date = hfsp_now2mt();
 130                if (cnid == inode->i_ino) {
 131                        hfsplus_cat_set_perms(inode, &file->permissions);
 132                        if (S_ISLNK(inode->i_mode)) {
 133                                file->user_info.fdType =
 134                                        cpu_to_be32(HFSP_SYMLINK_TYPE);
 135                                file->user_info.fdCreator =
 136                                        cpu_to_be32(HFSP_SYMLINK_CREATOR);
 137                        } else {
 138                                file->user_info.fdType =
 139                                        cpu_to_be32(sbi->type);
 140                                file->user_info.fdCreator =
 141                                        cpu_to_be32(sbi->creator);
 142                        }
 143                        if (HFSPLUS_FLG_IMMUTABLE &
 144                                        (file->permissions.rootflags |
 145                                        file->permissions.userflags))
 146                                file->flags |=
 147                                        cpu_to_be16(HFSPLUS_FILE_LOCKED);
 148                } else {
 149                        file->user_info.fdType =
 150                                cpu_to_be32(HFSP_HARDLINK_TYPE);
 151                        file->user_info.fdCreator =
 152                                cpu_to_be32(HFSP_HFSPLUS_CREATOR);
 153                        file->user_info.fdFlags =
 154                                cpu_to_be16(0x100);
 155                        file->create_date =
 156                                HFSPLUS_I(sbi->hidden_dir)->create_date;
 157                        file->permissions.dev =
 158                                cpu_to_be32(HFSPLUS_I(inode)->linkid);
 159                }
 160                return sizeof(*file);
 161        }
 162}
 163
 164static int hfsplus_fill_cat_thread(struct super_block *sb,
 165                                   hfsplus_cat_entry *entry, int type,
 166                                   u32 parentid, struct qstr *str)
 167{
 168        entry->type = cpu_to_be16(type);
 169        entry->thread.reserved = 0;
 170        entry->thread.parentID = cpu_to_be32(parentid);
 171        hfsplus_asc2uni(sb, &entry->thread.nodeName, HFSPLUS_MAX_STRLEN,
 172                                str->name, str->len);
 173        return 10 + be16_to_cpu(entry->thread.nodeName.length) * 2;
 174}
 175
 176/* Try to get a catalog entry for given catalog id */
 177int hfsplus_find_cat(struct super_block *sb, u32 cnid,
 178                     struct hfs_find_data *fd)
 179{
 180        hfsplus_cat_entry tmp;
 181        int err;
 182        u16 type;
 183
 184        hfsplus_cat_build_key(sb, fd->search_key, cnid, NULL);
 185        err = hfs_brec_read(fd, &tmp, sizeof(hfsplus_cat_entry));
 186        if (err)
 187                return err;
 188
 189        type = be16_to_cpu(tmp.type);
 190        if (type != HFSPLUS_FOLDER_THREAD && type != HFSPLUS_FILE_THREAD) {
 191                pr_err("found bad thread record in catalog\n");
 192                return -EIO;
 193        }
 194
 195        if (be16_to_cpu(tmp.thread.nodeName.length) > 255) {
 196                pr_err("catalog name length corrupted\n");
 197                return -EIO;
 198        }
 199
 200        hfsplus_cat_build_key_uni(fd->search_key,
 201                be32_to_cpu(tmp.thread.parentID),
 202                &tmp.thread.nodeName);
 203        return hfs_brec_find(fd, hfs_find_rec_by_key);
 204}
 205
 206int hfsplus_create_cat(u32 cnid, struct inode *dir,
 207                struct qstr *str, struct inode *inode)
 208{
 209        struct super_block *sb = dir->i_sb;
 210        struct hfs_find_data fd;
 211        hfsplus_cat_entry entry;
 212        int entry_size;
 213        int err;
 214
 215        hfs_dbg(CAT_MOD, "create_cat: %s,%u(%d)\n",
 216                str->name, cnid, inode->i_nlink);
 217        err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
 218        if (err)
 219                return err;
 220
 221        hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
 222        entry_size = hfsplus_fill_cat_thread(sb, &entry,
 223                S_ISDIR(inode->i_mode) ?
 224                        HFSPLUS_FOLDER_THREAD : HFSPLUS_FILE_THREAD,
 225                dir->i_ino, str);
 226        err = hfs_brec_find(&fd, hfs_find_rec_by_key);
 227        if (err != -ENOENT) {
 228                if (!err)
 229                        err = -EEXIST;
 230                goto err2;
 231        }
 232        err = hfs_brec_insert(&fd, &entry, entry_size);
 233        if (err)
 234                goto err2;
 235
 236        hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
 237        entry_size = hfsplus_cat_build_record(&entry, cnid, inode);
 238        err = hfs_brec_find(&fd, hfs_find_rec_by_key);
 239        if (err != -ENOENT) {
 240                /* panic? */
 241                if (!err)
 242                        err = -EEXIST;
 243                goto err1;
 244        }
 245        err = hfs_brec_insert(&fd, &entry, entry_size);
 246        if (err)
 247                goto err1;
 248
 249        dir->i_size++;
 250        dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
 251        hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
 252
 253        hfs_find_exit(&fd);
 254        return 0;
 255
 256err1:
 257        hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
 258        if (!hfs_brec_find(&fd, hfs_find_rec_by_key))
 259                hfs_brec_remove(&fd);
 260err2:
 261        hfs_find_exit(&fd);
 262        return err;
 263}
 264
 265int hfsplus_delete_cat(u32 cnid, struct inode *dir, struct qstr *str)
 266{
 267        struct super_block *sb = dir->i_sb;
 268        struct hfs_find_data fd;
 269        struct hfsplus_fork_raw fork;
 270        struct list_head *pos;
 271        int err, off;
 272        u16 type;
 273
 274        hfs_dbg(CAT_MOD, "delete_cat: %s,%u\n", str ? str->name : NULL, cnid);
 275        err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
 276        if (err)
 277                return err;
 278
 279        if (!str) {
 280                int len;
 281
 282                hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
 283                err = hfs_brec_find(&fd, hfs_find_rec_by_key);
 284                if (err)
 285                        goto out;
 286
 287                off = fd.entryoffset +
 288                        offsetof(struct hfsplus_cat_thread, nodeName);
 289                fd.search_key->cat.parent = cpu_to_be32(dir->i_ino);
 290                hfs_bnode_read(fd.bnode,
 291                        &fd.search_key->cat.name.length, off, 2);
 292                len = be16_to_cpu(fd.search_key->cat.name.length) * 2;
 293                hfs_bnode_read(fd.bnode,
 294                        &fd.search_key->cat.name.unicode,
 295                        off + 2, len);
 296                fd.search_key->key_len = cpu_to_be16(6 + len);
 297        } else
 298                hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
 299
 300        err = hfs_brec_find(&fd, hfs_find_rec_by_key);
 301        if (err)
 302                goto out;
 303
 304        type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
 305        if (type == HFSPLUS_FILE) {
 306#if 0
 307                off = fd.entryoffset + offsetof(hfsplus_cat_file, data_fork);
 308                hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
 309                hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_DATA);
 310#endif
 311
 312                off = fd.entryoffset +
 313                        offsetof(struct hfsplus_cat_file, rsrc_fork);
 314                hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
 315                hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_RSRC);
 316        }
 317
 318        list_for_each(pos, &HFSPLUS_I(dir)->open_dir_list) {
 319                struct hfsplus_readdir_data *rd =
 320                        list_entry(pos, struct hfsplus_readdir_data, list);
 321                if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
 322                        rd->file->f_pos--;
 323        }
 324
 325        err = hfs_brec_remove(&fd);
 326        if (err)
 327                goto out;
 328
 329        hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
 330        err = hfs_brec_find(&fd, hfs_find_rec_by_key);
 331        if (err)
 332                goto out;
 333
 334        err = hfs_brec_remove(&fd);
 335        if (err)
 336                goto out;
 337
 338        dir->i_size--;
 339        dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
 340        hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
 341
 342        if (type == HFSPLUS_FILE || type == HFSPLUS_FOLDER) {
 343                if (HFSPLUS_SB(sb)->attr_tree)
 344                        hfsplus_delete_all_attrs(dir, cnid);
 345        }
 346
 347out:
 348        hfs_find_exit(&fd);
 349
 350        return err;
 351}
 352
 353int hfsplus_rename_cat(u32 cnid,
 354                       struct inode *src_dir, struct qstr *src_name,
 355                       struct inode *dst_dir, struct qstr *dst_name)
 356{
 357        struct super_block *sb = src_dir->i_sb;
 358        struct hfs_find_data src_fd, dst_fd;
 359        hfsplus_cat_entry entry;
 360        int entry_size, type;
 361        int err;
 362
 363        hfs_dbg(CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n",
 364                cnid, src_dir->i_ino, src_name->name,
 365                dst_dir->i_ino, dst_name->name);
 366        err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &src_fd);
 367        if (err)
 368                return err;
 369        dst_fd = src_fd;
 370
 371        /* find the old dir entry and read the data */
 372        hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
 373        err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
 374        if (err)
 375                goto out;
 376        if (src_fd.entrylength > sizeof(entry) || src_fd.entrylength < 0) {
 377                err = -EIO;
 378                goto out;
 379        }
 380
 381        hfs_bnode_read(src_fd.bnode, &entry, src_fd.entryoffset,
 382                                src_fd.entrylength);
 383
 384        /* create new dir entry with the data from the old entry */
 385        hfsplus_cat_build_key(sb, dst_fd.search_key, dst_dir->i_ino, dst_name);
 386        err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
 387        if (err != -ENOENT) {
 388                if (!err)
 389                        err = -EEXIST;
 390                goto out;
 391        }
 392
 393        err = hfs_brec_insert(&dst_fd, &entry, src_fd.entrylength);
 394        if (err)
 395                goto out;
 396        dst_dir->i_size++;
 397        dst_dir->i_mtime = dst_dir->i_ctime = CURRENT_TIME_SEC;
 398
 399        /* finally remove the old entry */
 400        hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
 401        err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
 402        if (err)
 403                goto out;
 404        err = hfs_brec_remove(&src_fd);
 405        if (err)
 406                goto out;
 407        src_dir->i_size--;
 408        src_dir->i_mtime = src_dir->i_ctime = CURRENT_TIME_SEC;
 409
 410        /* remove old thread entry */
 411        hfsplus_cat_build_key(sb, src_fd.search_key, cnid, NULL);
 412        err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
 413        if (err)
 414                goto out;
 415        type = hfs_bnode_read_u16(src_fd.bnode, src_fd.entryoffset);
 416        err = hfs_brec_remove(&src_fd);
 417        if (err)
 418                goto out;
 419
 420        /* create new thread entry */
 421        hfsplus_cat_build_key(sb, dst_fd.search_key, cnid, NULL);
 422        entry_size = hfsplus_fill_cat_thread(sb, &entry, type,
 423                dst_dir->i_ino, dst_name);
 424        err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
 425        if (err != -ENOENT) {
 426                if (!err)
 427                        err = -EEXIST;
 428                goto out;
 429        }
 430        err = hfs_brec_insert(&dst_fd, &entry, entry_size);
 431
 432        hfsplus_mark_inode_dirty(dst_dir, HFSPLUS_I_CAT_DIRTY);
 433        hfsplus_mark_inode_dirty(src_dir, HFSPLUS_I_CAT_DIRTY);
 434out:
 435        hfs_bnode_put(dst_fd.bnode);
 436        hfs_find_exit(&src_fd);
 437        return err;
 438}
 439
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.