target/linux/generic/files/fs/yaffs2/yaffs_packedtags1.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2010 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
  17 void yaffs_PackTags1(yaffs_PackedTags1 *pt, const yaffs_ext_tags *t)
  18 {
  19         pt->chunk_id = t->chunk_id;
  20         pt->serial_number = t->serial_number;
  21         pt->n_bytes = t->n_bytes;
  22         pt->obj_id = t->obj_id;
  23         pt->ecc = 0;
  24         pt->deleted = (t->is_deleted) ? 0 : 1;
  25         pt->unusedStuff = 0;
  26         pt->shouldBeFF = 0xFFFFFFFF;
  27
  28 }
  29
  30 void yaffs_unpack_tags1(yaffs_ext_tags *t, const yaffs_PackedTags1 *pt)
  31 {
  32         static const __u8 allFF[] =
  33             { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  34 0xff };
  35
  36         if (memcmp(allFF, pt, sizeof(yaffs_PackedTags1))) {
  37                 t->block_bad = 0;
  38                 if (pt->shouldBeFF != 0xFFFFFFFF)
  39                         t->block_bad = 1;
  40                 t->chunk_used = 1;
  41                 t->obj_id = pt->obj_id;
  42                 t->chunk_id = pt->chunk_id;
  43                 t->n_bytes = pt->n_bytes;
  44                 t->ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
  45                 t->is_deleted = (pt->deleted) ? 0 : 1;
  46                 t->serial_number = pt->serial_number;
  47         } else {
  48                 memset(t, 0, sizeof(yaffs_ext_tags));
  49         }
  50 }