fs/yaffs2/yaffs_packedtags2.h

   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 Lesser General Public License version 2.1 as
  11  * published by the Free Software Foundation.
  12  *
  13  * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
  14  */
  15
  16 /* This is used to pack YAFFS2 tags, not YAFFS1tags. */
  17
  18 #ifndef __YAFFS_PACKEDTAGS2_H__
  19 #define __YAFFS_PACKEDTAGS2_H__
  20
  21 #include "yaffs_guts.h"
  22 #include "yaffs_ecc.h"
  23
  24 struct yaffs_packed_tags2_tags_only {
  25         unsigned seq_number;
  26         unsigned obj_id;
  27         unsigned chunk_id;
  28         unsigned n_bytes;
  29 };
  30
  31 struct yaffs_packed_tags2 {
  32         struct yaffs_packed_tags2_tags_only t;
  33         struct yaffs_ecc_other ecc;
  34 };
  35
  36 /* Full packed tags with ECC, used for oob tags */
  37 void yaffs_pack_tags2(struct yaffs_packed_tags2 *pt,
  38                       const struct yaffs_ext_tags *t, int tags_ecc);
  39 void yaffs_unpack_tags2(struct yaffs_ext_tags *t, struct yaffs_packed_tags2 *pt,
  40                         int tags_ecc);
  41
  42 /* Only the tags part (no ECC for use with inband tags */
  43 void yaffs_pack_tags2_tags_only(struct yaffs_packed_tags2_tags_only *pt,
  44                                 const struct yaffs_ext_tags *t);
  45 void yaffs_unpack_tags2_tags_only(struct yaffs_ext_tags *t,
  46                                   struct yaffs_packed_tags2_tags_only *pt);
  47 #endif