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/*
* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
*
* Copyright (C) 2002-2018 Aleph One Ltd.
*
* 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.
*
* This file handles the marshalling (ie internal<-->external structure
* translation between the internal tags and the stored tags in Yaffs2-style
* tags storage.
*/
#include "yaffs_guts.h"
#include "yaffs_trace.h"
#include "yaffs_packedtags2.h"
static int yaffs_tags_marshall_write(struct yaffs_dev *dev,
int nand_chunk, const u8 *data,
const struct yaffs_ext_tags *tags)
{
struct yaffs_packed_tags2 pt;
int retval;
int packed_tags_size =
dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
void *packed_tags_ptr =
dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
yaffs_trace(YAFFS_TRACE_MTD,
"yaffs_tags_marshall_write chunk %d data %p tags %p",
nand_chunk, data, tags);
/* For yaffs2 writing there must be both data and tags.
* If we're using inband tags, then the tags are stuffed into
* the end of the data buffer.
*/
if (!data || !tags)
BUG();
else if (dev->param.inband_tags) {
struct yaffs_packed_tags2_tags_only *pt2tp;
pt2tp =
(struct yaffs_packed_tags2_tags_only *)(data +
dev->
data_bytes_per_chunk);
yaffs_pack_tags2_tags_only(dev, pt2tp, tags);
} else {
yaffs_pack_tags2(dev, &pt, tags, !dev->param.no_tags_ecc);
}
retval = dev->drv.drv_write_chunk_fn(dev, nand_chunk,
data, dev->param.total_bytes_per_chunk,
(dev->param.inband_tags) ? NULL : packed_tags_ptr,
(dev->param.inband_tags) ? 0 : packed_tags_size);
return retval;
}
static int yaffs_tags_marshall_read(struct yaffs_dev *dev,
int nand_chunk, u8 *data,
struct yaffs_ext_tags *tags)
{
int retval = 0;
int local_data = 0;
u8 spare_buffer[100];
enum yaffs_ecc_result ecc_result;
struct yaffs_packed_tags2 pt;
int packed_tags_size =
dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
void *packed_tags_ptr =
dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
yaffs_trace(YAFFS_TRACE_MTD,
"yaffs_tags_marshall_read chunk %d data %p tags %p",
nand_chunk, data, tags);
if (dev->param.inband_tags) {
if (!data) {
local_data = 1;
data = yaffs_get_temp_buffer(dev);
}
}
if (dev->param.inband_tags || (data && !tags))
retval = dev->drv.drv_read_chunk_fn(dev, nand_chunk,
data, dev->param.total_bytes_per_chunk,
NULL, 0,
&ecc_result);
else if (tags)
retval = dev->drv.drv_read_chunk_fn(dev, nand_chunk,
data, dev->param.total_bytes_per_chunk,
spare_buffer, packed_tags_size,
&ecc_result);
else
BUG();
if (retval == YAFFS_FAIL)
return YAFFS_FAIL;
if (dev->param.inband_tags) {
if (tags) {
struct yaffs_packed_tags2_tags_only *pt2tp;
pt2tp =
(struct yaffs_packed_tags2_tags_only *)
&data[dev->data_bytes_per_chunk];
yaffs_unpack_tags2_tags_only(dev, tags, pt2tp);
}
} else if (tags) {
memcpy(packed_tags_ptr, spare_buffer, packed_tags_size);
yaffs_unpack_tags2(dev, tags, &pt, !dev->param.no_tags_ecc);
}
if (local_data)
yaffs_release_temp_buffer(dev, data);
if (tags && ecc_result == YAFFS_ECC_RESULT_UNFIXED) {
tags->ecc_result = YAFFS_ECC_RESULT_UNFIXED;
dev->n_ecc_unfixed++;
}
if (tags && ecc_result == YAFFS_ECC_RESULT_FIXED) {
if (tags->ecc_result <= YAFFS_ECC_RESULT_NO_ERROR)
tags->ecc_result = YAFFS_ECC_RESULT_FIXED;
dev->n_ecc_fixed++;
}
if (ecc_result < YAFFS_ECC_RESULT_UNFIXED)
return YAFFS_OK;
else
return YAFFS_FAIL;
}
static int yaffs_tags_marshall_query_block(struct yaffs_dev *dev, int block_no,
enum yaffs_block_state *state,
u32 *seq_number)
{
int retval;
yaffs_trace(YAFFS_TRACE_MTD, "yaffs_tags_marshall_query_block %d",
block_no);
retval = dev->drv.drv_check_bad_fn(dev, block_no);
if (retval== YAFFS_FAIL) {
yaffs_trace(YAFFS_TRACE_MTD, "block is bad");
*state = YAFFS_BLOCK_STATE_DEAD;
*seq_number = 0;
} else {
struct yaffs_ext_tags t;
yaffs_tags_marshall_read(dev,
block_no * dev->param.chunks_per_block,
NULL, &t);
if (t.chunk_used) {
*seq_number = t.seq_number;
*state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
} else {
*seq_number = 0;
*state = YAFFS_BLOCK_STATE_EMPTY;
}
}
yaffs_trace(YAFFS_TRACE_MTD,
"block query returns seq %d state %d",
*seq_number, *state);
if (retval == 0)
return YAFFS_OK;
else
return YAFFS_FAIL;
}
static int yaffs_tags_marshall_mark_bad(struct yaffs_dev *dev, int block_no)
{
return dev->drv.drv_mark_bad_fn(dev, block_no);
}
void yaffs_tags_marshall_install(struct yaffs_dev *dev)
{
if (!dev->param.is_yaffs2)
return;
if (!dev->tagger.write_chunk_tags_fn)
dev->tagger.write_chunk_tags_fn = yaffs_tags_marshall_write;
if (!dev->tagger.read_chunk_tags_fn)
dev->tagger.read_chunk_tags_fn = yaffs_tags_marshall_read;
if (!dev->tagger.query_block_fn)
dev->tagger.query_block_fn = yaffs_tags_marshall_query_block;
if (!dev->tagger.mark_bad_fn)
dev->tagger.mark_bad_fn = yaffs_tags_marshall_mark_bad;
}
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