static int yaffs2_checkpt_flush_buffer(struct yaffs_dev *dev)
{
int chunk;
int offset_chunk;
struct yaffs_ext_tags tags;
if (dev->checkpt_cur_block < 0) {
yaffs2_checkpt_find_erased_block(dev);
dev->checkpt_cur_chunk = 0;
}
if (dev->checkpt_cur_block < 0)
return 0;
tags.is_deleted = 0;
tags.obj_id = dev->checkpt_next_block; /* Hint to next place to look */
tags.chunk_id = dev->checkpt_page_seq + 1;
tags.seq_number = YAFFS_SEQUENCE_CHECKPOINT_DATA;
tags.n_bytes = dev->data_bytes_per_chunk;
if (dev->checkpt_cur_chunk == 0) {
/* First chunk we write for the block? Set block state to
checkpoint */
struct yaffs_block_info *bi =
yaffs_get_block_info(dev, dev->checkpt_cur_block);
bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT;
dev->blocks_in_checkpt++;
}
chunk =
dev->checkpt_cur_block * dev->param.chunks_per_block +
dev->checkpt_cur_chunk;
yaffs_trace(YAFFS_TRACE_CHECKPOINT,
"checkpoint wite buffer nand %d(%d:%d) objid %d chId %d",
chunk, dev->checkpt_cur_block, dev->checkpt_cur_chunk,
tags.obj_id, tags.chunk_id);
offset_chunk = apply_chunk_offset(dev, chunk);
dev->n_page_writes++;
dev->param.write_chunk_tags_fn(dev, offset_chunk,
dev->checkpt_buffer, &tags);
dev->checkpt_page_seq++;
dev->checkpt_cur_chunk++;
if (dev->checkpt_cur_chunk >= dev->param.chunks_per_block) {
dev->checkpt_cur_chunk = 0;
dev->checkpt_cur_block = -1;
}
memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk);
yaffs2_checkpt_init_chunk_hdr(dev);
return 1;
}
static void yaffs2_checkpt_find_block(struct yaffs_dev *dev)
{
int i;
struct yaffs_ext_tags tags;
yaffs_trace(YAFFS_TRACE_CHECKPOINT,
"find next checkpt block: start: blocks %d next %d",
dev->blocks_in_checkpt, dev->checkpt_next_block);
if (dev->blocks_in_checkpt < dev->checkpt_max_blocks)
for (i = dev->checkpt_next_block; i <= dev->internal_end_block;
i++) {
int chunk = i * dev->param.chunks_per_block;
enum yaffs_block_state state;
u32 seq;
dev->param.query_block_fn(dev,
apply_block_offset(dev, i),
&state, &seq);
if (state == YAFFS_BLOCK_STATE_DEAD)
continue;
dev->param.read_chunk_tags_fn(dev,
apply_chunk_offset(dev, chunk),
NULL, &tags);
yaffs_trace(YAFFS_TRACE_CHECKPOINT,
"find next checkpt block: search: block %d state %d oid %d seq %d eccr %d",
i, (int) state,
tags.obj_id, tags.seq_number,
tags.ecc_result);
if (tags.seq_number != YAFFS_SEQUENCE_CHECKPOINT_DATA)
continue;
/* Right kind of block */
dev->checkpt_next_block = tags.obj_id;
dev->checkpt_cur_block = i;
dev->checkpt_block_list[dev->blocks_in_checkpt] = i;
dev->blocks_in_checkpt++;
yaffs_trace(YAFFS_TRACE_CHECKPOINT,
"found checkpt block %d", i);
return;
}
yaffs_trace(YAFFS_TRACE_CHECKPOINT, "found no more checkpt blocks");
dev->checkpt_next_block = -1;
dev->checkpt_cur_block = -1;
}
int yaffs_rd_chunk_tags_nand(struct yaffs_dev* dev, int nand_chunk, u8* buffer, struct yaffs_ext_tags* tags)
{
int result;
struct yaffs_ext_tags local_tags;
int flash_chunk = apply_chunk_offset(dev, nand_chunk);
dev->n_page_reads++;
/* If there are no tags provided use local tags. */
if (!tags)
tags = &local_tags;
result = dev->tagger.read_chunk_tags_fn(dev, flash_chunk, buffer, tags);
if (tags && tags->ecc_result > YAFFS_ECC_RESULT_NO_ERROR)
{
struct yaffs_block_info* bi;
bi = yaffs_get_block_info(dev, nand_chunk / dev->param.chunks_per_block);
yaffs_handle_chunk_error(dev, bi);
}
return result;
}
int yaffs_wr_chunk_tags_nand(struct yaffs_dev* dev, int nand_chunk, const u8* buffer, struct yaffs_ext_tags* tags)
{
int result;
int flash_chunk = apply_chunk_offset(dev, nand_chunk);
dev->n_page_writes++;
if (!tags)
{
yaffs_trace(YAFFS_TRACE_ERROR, "Writing with no tags");
BUG();
return YAFFS_FAIL;
}
tags->seq_number = dev->seq_number;
tags->chunk_used = 1;
yaffs_tracef(YAFFS_TRACE_WRITE, "Writing chunk %d tags %d %d", nand_chunk, tags->obj_id, tags->chunk_id);
result = dev->tagger.write_chunk_tags_fn(dev, flash_chunk, buffer, tags);
yaffs_summary_add(dev, tags, nand_chunk);
return result;
}
int yaffs2_checkpt_rd(struct yaffs_dev *dev, void *data, int n_bytes)
{
int i = 0;
int ok = 1;
struct yaffs_ext_tags tags;
int chunk;
int offset_chunk;
u8 *data_bytes = (u8 *) data;
if (!dev->checkpt_buffer)
return 0;
if (dev->checkpt_open_write)
return -1;
while (i < n_bytes && ok) {
if (dev->checkpt_byte_offs < 0 ||
dev->checkpt_byte_offs >= dev->data_bytes_per_chunk) {
if (dev->checkpt_cur_block < 0) {
yaffs2_checkpt_find_block(dev);
dev->checkpt_cur_chunk = 0;
}
if (dev->checkpt_cur_block < 0) {
ok = 0;
break;
}
chunk = dev->checkpt_cur_block *
dev->param.chunks_per_block +
dev->checkpt_cur_chunk;
offset_chunk = apply_chunk_offset(dev, chunk);
dev->n_page_reads++;
/* read in the next chunk */
dev->param.read_chunk_tags_fn(dev,
offset_chunk,
dev->checkpt_buffer,
&tags);
if (tags.chunk_id != (dev->checkpt_page_seq + 1) ||
tags.ecc_result > YAFFS_ECC_RESULT_FIXED ||
tags.seq_number != YAFFS_SEQUENCE_CHECKPOINT_DATA) {
ok = 0;
break;
}
if(!yaffs2_checkpt_check_chunk_hdr(dev)) {
ok = 0;
break;
}
dev->checkpt_page_seq++;
dev->checkpt_cur_chunk++;
if (dev->checkpt_cur_chunk >=
dev->param.chunks_per_block)
dev->checkpt_cur_block = -1;
}
*data_bytes = dev->checkpt_buffer[dev->checkpt_byte_offs];
dev->checkpt_sum += *data_bytes;
dev->checkpt_xor ^= *data_bytes;
dev->checkpt_byte_offs++;
i++;
data_bytes++;
dev->checkpt_byte_count++;
}
return i;
}
