fs/yaffs2/yaffs_packedtags1.c

/*
 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
 *
 * Copyright (C) 2002-2011 Aleph One Ltd.
 *   for Toby Churchill Ltd and Brightstar Engineering
 *
 * Created by Charles Manning <charles@aleph1.co.uk>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include "yaffs_packedtags1.h"
#include "yportenv.h"

static const u8 all_ff[20] = {
	0xff, 0xff, 0xff, 0xff,
	0xff, 0xff, 0xff, 0xff,
	0xff, 0xff, 0xff, 0xff,
	0xff, 0xff, 0xff, 0xff,
	0xff, 0xff, 0xff, 0xff
};

void yaffs_pack_tags1(struct yaffs_packed_tags1 *pt,
		      const struct yaffs_ext_tags *t)
{
	pt->chunk_id = t->chunk_id;
	pt->serial_number = t->serial_number;
	pt->n_bytes = t->n_bytes;
	pt->obj_id = t->obj_id;
	pt->ecc = 0;
	pt->deleted = (t->is_deleted) ? 0 : 1;
	pt->unused_stuff = 0;
	pt->should_be_ff = 0xffffffff;
}

void yaffs_unpack_tags1(struct yaffs_ext_tags *t,
			const struct yaffs_packed_tags1 *pt)
{

	if (memcmp(all_ff, pt, sizeof(struct yaffs_packed_tags1))) {
		t->block_bad = 0;
		if (pt->should_be_ff != 0xffffffff)
			t->block_bad = 1;
		t->chunk_used = 1;
		t->obj_id = pt->obj_id;
		t->chunk_id = pt->chunk_id;
		t->n_bytes = pt->n_bytes;
		t->ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
		t->is_deleted = (pt->deleted) ? 0 : 1;
		t->serial_number = pt->serial_number;
	} else {
		memset(t, 0, sizeof(struct yaffs_ext_tags));
	}
}