target/linux/generic-2.6/files/fs/yaffs2/yaffs_packedtags1.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2007 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_ExtendedTags * t)
  18 {
  19         pt->chunkId = t->chunkId;
  20         pt->serialNumber = t->serialNumber;
  21         pt->byteCount = t->byteCount;
  22         pt->objectId = t->objectId;
  23         pt->ecc = 0;
  24         pt->deleted = (t->chunkDeleted) ? 0 : 1;
  25         pt->unusedStuff = 0;
  26         pt->shouldBeFF = 0xFFFFFFFF;
  27
  28 }
  29
  30 void yaffs_UnpackTags1(yaffs_ExtendedTags * 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->blockBad = 0;
  38                 if (pt->shouldBeFF != 0xFFFFFFFF) {
  39                         t->blockBad = 1;
  40                 }
  41                 t->chunkUsed = 1;
  42                 t->objectId = pt->objectId;
  43                 t->chunkId = pt->chunkId;
  44                 t->byteCount = pt->byteCount;
  45                 t->eccResult = YAFFS_ECC_RESULT_NO_ERROR;
  46                 t->chunkDeleted = (pt->deleted) ? 0 : 1;
  47                 t->serialNumber = pt->serialNumber;
  48         } else {
  49                 memset(t, 0, sizeof(yaffs_ExtendedTags));
  50
  51         }
  52 }