linux/fs/hfsplus/catalog.c
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   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, 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
  57static 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
  70static 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
  87static 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
 141static 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 */
 153int 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
 181int 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
 226err1:
 227        hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
 228        if (!hfs_brec_find(&fd))
 229                hfs_brec_remove(&fd);
 230err2:
 231        hfs_find_exit(&fd);
 232        return err;
 233}
 234
 235int 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);
 305out:
 306        hfs_find_exit(&fd);
 307
 308        return err;
 309}
 310
 311int 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);
 384out:
 385        hfs_bnode_put(dst_fd.bnode);
 386        hfs_find_exit(&src_fd);
 387        return err;
 388}
 389