LXR uboot/fs/yaffs2/yaffs

   1/*
   2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3 *
   4 * Copyright (C) 2002-2011 Aleph One Ltd.
   5 *   for Toby Churchill Ltd and Brightstar Engineering
   6 *
   7 * Created by Charles Manning <charles@aleph1.co.uk>
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License version 2 as
  11 * published by the Free Software Foundation.
  12 */
  13
  14#include "yaffs_packedtags1.h"
  15#include "yportenv.h"
  16
  17static const u8 all_ff[20] = {
  18        0xff, 0xff, 0xff, 0xff,
  19        0xff, 0xff, 0xff, 0xff,
  20        0xff, 0xff, 0xff, 0xff,
  21        0xff, 0xff, 0xff, 0xff,
  22        0xff, 0xff, 0xff, 0xff
  23};
  24
  25void yaffs_pack_tags1(struct yaffs_packed_tags1 *pt,
  26                      const struct yaffs_ext_tags *t)
  27{
  28        pt->chunk_id = t->chunk_id;
  29        pt->serial_number = t->serial_number;
  30        pt->n_bytes = t->n_bytes;
  31        pt->obj_id = t->obj_id;
  32        pt->ecc = 0;
  33        pt->deleted = (t->is_deleted) ? 0 : 1;
  34        pt->unused_stuff = 0;
  35        pt->should_be_ff = 0xffffffff;
  36}
  37
  38void yaffs_unpack_tags1(struct yaffs_ext_tags *t,
  39                        const struct yaffs_packed_tags1 *pt)
  40{
  41
  42        if (memcmp(all_ff, pt, sizeof(struct yaffs_packed_tags1))) {
  43                t->block_bad = 0;
  44                if (pt->should_be_ff != 0xffffffff)
  45                        t->block_bad = 1;
  46                t->chunk_used = 1;
  47                t->obj_id = pt->obj_id;
  48                t->chunk_id = pt->chunk_id;
  49                t->n_bytes = pt->n_bytes;
  50                t->ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
  51                t->is_deleted = (pt->deleted) ? 0 : 1;
  52                t->serial_number = pt->serial_number;
  53        } else {
  54                memset(t, 0, sizeof(struct yaffs_ext_tags));
  55        }
  56}
  57