linux/fs/hfs/catalog.c
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   1/*
   2 *  linux/fs/hfs/catalog.c
   3 *
   4 * Copyright (C) 1995-1997  Paul H. Hargrove
   5 * (C) 2003 Ardis Technologies <roman@ardistech.com>
   6 * This file may be distributed under the terms of the GNU General Public License.
   7 *
   8 * This file contains the functions related to the catalog B-tree.
   9 *
  10 * Cache code shamelessly stolen from
  11 *     linux/fs/inode.c Copyright (C) 1991, 1992  Linus Torvalds
  12 *     re-shamelessly stolen Copyright (C) 1997 Linus Torvalds
  13 */
  14
  15#include "hfs_fs.h"
  16#include "btree.h"
  17
  18/*
  19 * hfs_cat_build_key()
  20 *
  21 * Given the ID of the parent and the name build a search key.
  22 */
  23void hfs_cat_build_key(struct super_block *sb, btree_key *key, u32 parent, struct qstr *name)
  24{
  25        key->cat.reserved = 0;
  26        key->cat.ParID = cpu_to_be32(parent);
  27        if (name) {
  28                hfs_asc2mac(sb, &key->cat.CName, name);
  29                key->key_len = 6 + key->cat.CName.len;
  30        } else {
  31                memset(&key->cat.CName, 0, sizeof(struct hfs_name));
  32                key->key_len = 6;
  33        }
  34}
  35
  36static int hfs_cat_build_record(hfs_cat_rec *rec, u32 cnid, struct inode *inode)
  37{
  38        __be32 mtime = hfs_mtime();
  39
  40        memset(rec, 0, sizeof(*rec));
  41        if (S_ISDIR(inode->i_mode)) {
  42                rec->type = HFS_CDR_DIR;
  43                rec->dir.DirID = cpu_to_be32(cnid);
  44                rec->dir.CrDat = mtime;
  45                rec->dir.MdDat = mtime;
  46                rec->dir.BkDat = 0;
  47                rec->dir.UsrInfo.frView = cpu_to_be16(0xff);
  48                return sizeof(struct hfs_cat_dir);
  49        } else {
  50                /* init some fields for the file record */
  51                rec->type = HFS_CDR_FIL;
  52                rec->file.Flags = HFS_FIL_USED | HFS_FIL_THD;
  53                if (!(inode->i_mode & S_IWUSR))
  54                        rec->file.Flags |= HFS_FIL_LOCK;
  55                rec->file.FlNum = cpu_to_be32(cnid);
  56                rec->file.CrDat = mtime;
  57                rec->file.MdDat = mtime;
  58                rec->file.BkDat = 0;
  59                rec->file.UsrWds.fdType = HFS_SB(inode->i_sb)->s_type;
  60                rec->file.UsrWds.fdCreator = HFS_SB(inode->i_sb)->s_creator;
  61                return sizeof(struct hfs_cat_file);
  62        }
  63}
  64
  65static int hfs_cat_build_thread(struct super_block *sb,
  66                                hfs_cat_rec *rec, int type,
  67                                u32 parentid, struct qstr *name)
  68{
  69        rec->type = type;
  70        memset(rec->thread.reserved, 0, sizeof(rec->thread.reserved));
  71        rec->thread.ParID = cpu_to_be32(parentid);
  72        hfs_asc2mac(sb, &rec->thread.CName, name);
  73        return sizeof(struct hfs_cat_thread);
  74}
  75
  76/*
  77 * create_entry()
  78 *
  79 * Add a new file or directory to the catalog B-tree and
  80 * return a (struct hfs_cat_entry) for it in '*result'.
  81 */
  82int hfs_cat_create(u32 cnid, struct inode *dir, struct qstr *str, struct inode *inode)
  83{
  84        struct hfs_find_data fd;
  85        struct super_block *sb;
  86        union hfs_cat_rec entry;
  87        int entry_size;
  88        int err;
  89
  90        hfs_dbg(CAT_MOD, "create_cat: %s,%u(%d)\n",
  91                str->name, cnid, inode->i_nlink);
  92        if (dir->i_size >= HFS_MAX_VALENCE)
  93                return -ENOSPC;
  94
  95        sb = dir->i_sb;
  96        err = hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
  97        if (err)
  98                return err;
  99
 100        hfs_cat_build_key(sb, fd.search_key, cnid, NULL);
 101        entry_size = hfs_cat_build_thread(sb, &entry, S_ISDIR(inode->i_mode) ?
 102                        HFS_CDR_THD : HFS_CDR_FTH,
 103                        dir->i_ino, str);
 104        err = hfs_brec_find(&fd);
 105        if (err != -ENOENT) {
 106                if (!err)
 107                        err = -EEXIST;
 108                goto err2;
 109        }
 110        err = hfs_brec_insert(&fd, &entry, entry_size);
 111        if (err)
 112                goto err2;
 113
 114        hfs_cat_build_key(sb, fd.search_key, dir->i_ino, str);
 115        entry_size = hfs_cat_build_record(&entry, cnid, inode);
 116        err = hfs_brec_find(&fd);
 117        if (err != -ENOENT) {
 118                /* panic? */
 119                if (!err)
 120                        err = -EEXIST;
 121                goto err1;
 122        }
 123        err = hfs_brec_insert(&fd, &entry, entry_size);
 124        if (err)
 125                goto err1;
 126
 127        dir->i_size++;
 128        dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
 129        mark_inode_dirty(dir);
 130        hfs_find_exit(&fd);
 131        return 0;
 132
 133err1:
 134        hfs_cat_build_key(sb, fd.search_key, cnid, NULL);
 135        if (!hfs_brec_find(&fd))
 136                hfs_brec_remove(&fd);
 137err2:
 138        hfs_find_exit(&fd);
 139        return err;
 140}
 141
 142/*
 143 * hfs_cat_compare()
 144 *
 145 * Description:
 146 *   This is the comparison function used for the catalog B-tree.  In
 147 *   comparing catalog B-tree entries, the parent id is the most
 148 *   significant field (compared as unsigned ints).  The name field is
 149 *   the least significant (compared in "Macintosh lexical order",
 150 *   see hfs_strcmp() in string.c)
 151 * Input Variable(s):
 152 *   struct hfs_cat_key *key1: pointer to the first key to compare
 153 *   struct hfs_cat_key *key2: pointer to the second key to compare
 154 * Output Variable(s):
 155 *   NONE
 156 * Returns:
 157 *   int: negative if key1<key2, positive if key1>key2, and 0 if key1==key2
 158 * Preconditions:
 159 *   key1 and key2 point to "valid" (struct hfs_cat_key)s.
 160 * Postconditions:
 161 *   This function has no side-effects
 162 */
 163int hfs_cat_keycmp(const btree_key *key1, const btree_key *key2)
 164{
 165        int retval;
 166
 167        retval = be32_to_cpu(key1->cat.ParID) - be32_to_cpu(key2->cat.ParID);
 168        if (!retval)
 169                retval = hfs_strcmp(key1->cat.CName.name, key1->cat.CName.len,
 170                                    key2->cat.CName.name, key2->cat.CName.len);
 171
 172        return retval;
 173}
 174
 175/* Try to get a catalog entry for given catalog id */
 176// move to read_super???
 177int hfs_cat_find_brec(struct super_block *sb, u32 cnid,
 178                      struct hfs_find_data *fd)
 179{
 180        hfs_cat_rec rec;
 181        int res, len, type;
 182
 183        hfs_cat_build_key(sb, fd->search_key, cnid, NULL);
 184        res = hfs_brec_read(fd, &rec, sizeof(rec));
 185        if (res)
 186                return res;
 187
 188        type = rec.type;
 189        if (type != HFS_CDR_THD && type != HFS_CDR_FTH) {
 190                pr_err("found bad thread record in catalog\n");
 191                return -EIO;
 192        }
 193
 194        fd->search_key->cat.ParID = rec.thread.ParID;
 195        len = fd->search_key->cat.CName.len = rec.thread.CName.len;
 196        if (len > HFS_NAMELEN) {
 197                pr_err("bad catalog namelength\n");
 198                return -EIO;
 199        }
 200        memcpy(fd->search_key->cat.CName.name, rec.thread.CName.name, len);
 201        return hfs_brec_find(fd);
 202}
 203
 204
 205/*
 206 * hfs_cat_delete()
 207 *
 208 * Delete the indicated file or directory.
 209 * The associated thread is also removed unless ('with_thread'==0).
 210 */
 211int hfs_cat_delete(u32 cnid, struct inode *dir, struct qstr *str)
 212{
 213        struct super_block *sb;
 214        struct hfs_find_data fd;
 215        struct list_head *pos;
 216        int res, type;
 217
 218        hfs_dbg(CAT_MOD, "delete_cat: %s,%u\n", str ? str->name : NULL, cnid);
 219        sb = dir->i_sb;
 220        res = hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
 221        if (res)
 222                return res;
 223
 224        hfs_cat_build_key(sb, fd.search_key, dir->i_ino, str);
 225        res = hfs_brec_find(&fd);
 226        if (res)
 227                goto out;
 228
 229        type = hfs_bnode_read_u8(fd.bnode, fd.entryoffset);
 230        if (type == HFS_CDR_FIL) {
 231                struct hfs_cat_file file;
 232                hfs_bnode_read(fd.bnode, &file, fd.entryoffset, sizeof(file));
 233                if (be32_to_cpu(file.FlNum) == cnid) {
 234#if 0
 235                        hfs_free_fork(sb, &file, HFS_FK_DATA);
 236#endif
 237                        hfs_free_fork(sb, &file, HFS_FK_RSRC);
 238                }
 239        }
 240
 241        list_for_each(pos, &HFS_I(dir)->open_dir_list) {
 242                struct hfs_readdir_data *rd =
 243                        list_entry(pos, struct hfs_readdir_data, list);
 244                if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
 245                        rd->file->f_pos--;
 246        }
 247
 248        res = hfs_brec_remove(&fd);
 249        if (res)
 250                goto out;
 251
 252        hfs_cat_build_key(sb, fd.search_key, cnid, NULL);
 253        res = hfs_brec_find(&fd);
 254        if (!res) {
 255                res = hfs_brec_remove(&fd);
 256                if (res)
 257                        goto out;
 258        }
 259
 260        dir->i_size--;
 261        dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
 262        mark_inode_dirty(dir);
 263        res = 0;
 264out:
 265        hfs_find_exit(&fd);
 266
 267        return res;
 268}
 269
 270/*
 271 * hfs_cat_move()
 272 *
 273 * Rename a file or directory, possibly to a new directory.
 274 * If the destination exists it is removed and a
 275 * (struct hfs_cat_entry) for it is returned in '*result'.
 276 */
 277int hfs_cat_move(u32 cnid, struct inode *src_dir, struct qstr *src_name,
 278                 struct inode *dst_dir, struct qstr *dst_name)
 279{
 280        struct super_block *sb;
 281        struct hfs_find_data src_fd, dst_fd;
 282        union hfs_cat_rec entry;
 283        int entry_size, type;
 284        int err;
 285
 286        hfs_dbg(CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n",
 287                cnid, src_dir->i_ino, src_name->name,
 288                dst_dir->i_ino, dst_name->name);
 289        sb = src_dir->i_sb;
 290        err = hfs_find_init(HFS_SB(sb)->cat_tree, &src_fd);
 291        if (err)
 292                return err;
 293        dst_fd = src_fd;
 294
 295        /* find the old dir entry and read the data */
 296        hfs_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
 297        err = hfs_brec_find(&src_fd);
 298        if (err)
 299                goto out;
 300        if (src_fd.entrylength > sizeof(entry) || src_fd.entrylength < 0) {
 301                err = -EIO;
 302                goto out;
 303        }
 304
 305        hfs_bnode_read(src_fd.bnode, &entry, src_fd.entryoffset,
 306                            src_fd.entrylength);
 307
 308        /* create new dir entry with the data from the old entry */
 309        hfs_cat_build_key(sb, dst_fd.search_key, dst_dir->i_ino, dst_name);
 310        err = hfs_brec_find(&dst_fd);
 311        if (err != -ENOENT) {
 312                if (!err)
 313                        err = -EEXIST;
 314                goto out;
 315        }
 316
 317        err = hfs_brec_insert(&dst_fd, &entry, src_fd.entrylength);
 318        if (err)
 319                goto out;
 320        dst_dir->i_size++;
 321        dst_dir->i_mtime = dst_dir->i_ctime = CURRENT_TIME_SEC;
 322        mark_inode_dirty(dst_dir);
 323
 324        /* finally remove the old entry */
 325        hfs_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
 326        err = hfs_brec_find(&src_fd);
 327        if (err)
 328                goto out;
 329        err = hfs_brec_remove(&src_fd);
 330        if (err)
 331                goto out;
 332        src_dir->i_size--;
 333        src_dir->i_mtime = src_dir->i_ctime = CURRENT_TIME_SEC;
 334        mark_inode_dirty(src_dir);
 335
 336        type = entry.type;
 337        if (type == HFS_CDR_FIL && !(entry.file.Flags & HFS_FIL_THD))
 338                goto out;
 339
 340        /* remove old thread entry */
 341        hfs_cat_build_key(sb, src_fd.search_key, cnid, NULL);
 342        err = hfs_brec_find(&src_fd);
 343        if (err)
 344                goto out;
 345        err = hfs_brec_remove(&src_fd);
 346        if (err)
 347                goto out;
 348
 349        /* create new thread entry */
 350        hfs_cat_build_key(sb, dst_fd.search_key, cnid, NULL);
 351        entry_size = hfs_cat_build_thread(sb, &entry, type == HFS_CDR_FIL ? HFS_CDR_FTH : HFS_CDR_THD,
 352                                        dst_dir->i_ino, dst_name);
 353        err = hfs_brec_find(&dst_fd);
 354        if (err != -ENOENT) {
 355                if (!err)
 356                        err = -EEXIST;
 357                goto out;
 358        }
 359        err = hfs_brec_insert(&dst_fd, &entry, entry_size);
 360out:
 361        hfs_bnode_put(dst_fd.bnode);
 362        hfs_find_exit(&src_fd);
 363        return err;
 364}
 365
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