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    Subject[PATCH 07/29] Staging: yaffs2: yaffs_checkptrw: Add files
    Date
    Adding files to yaffs2 directory.

    Signed-off-by: Tracey Dent <tdent48227@gmail.com>
    ---
    drivers/staging/yaffs2/yaffs_checkptrw.c | 400 ++++++++++++++++++++++++++++++
    drivers/staging/yaffs2/yaffs_checkptrw.h | 34 +++
    2 files changed, 434 insertions(+), 0 deletions(-)
    create mode 100644 drivers/staging/yaffs2/yaffs_checkptrw.c
    create mode 100644 drivers/staging/yaffs2/yaffs_checkptrw.h

    diff --git a/drivers/staging/yaffs2/yaffs_checkptrw.c b/drivers/staging/yaffs2/yaffs_checkptrw.c
    new file mode 100644
    index 0000000..82d6874
    --- /dev/null
    +++ b/drivers/staging/yaffs2/yaffs_checkptrw.c
    @@ -0,0 +1,400 @@
    +/*
    + * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
    + *
    + * Copyright (C) 2002-2010 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_checkptrw.h"
    +#include "yaffs_getblockinfo.h"
    +
    +static int yaffs2_checkpt_space_ok(yaffs_dev_t *dev)
    +{
    + int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks;
    +
    + T(YAFFS_TRACE_CHECKPOINT,
    + (TSTR("checkpt blocks available = %d" TENDSTR),
    + blocks_avail));
    +
    + return (blocks_avail <= 0) ? 0 : 1;
    +}
    +
    +
    +static int yaffs_checkpt_erase(yaffs_dev_t *dev)
    +{
    + int i;
    +
    + if (!dev->param.erase_fn)
    + return 0;
    + T(YAFFS_TRACE_CHECKPOINT, (TSTR("checking blocks %d to %d"TENDSTR),
    + dev->internal_start_block, dev->internal_end_block));
    +
    + for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
    + yaffs_block_info_t *bi = yaffs_get_block_info(dev, i);
    + if (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT) {
    + T(YAFFS_TRACE_CHECKPOINT, (TSTR("erasing checkpt block %d"TENDSTR), i));
    +
    + dev->n_erasures++;
    +
    + if (dev->param.erase_fn(dev, i - dev->block_offset /* realign */)) {
    + bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
    + dev->n_erased_blocks++;
    + dev->n_free_chunks += dev->param.chunks_per_block;
    + } else {
    + dev->param.bad_block_fn(dev, i);
    + bi->block_state = YAFFS_BLOCK_STATE_DEAD;
    + }
    + }
    + }
    +
    + dev->blocks_in_checkpt = 0;
    +
    + return 1;
    +}
    +
    +
    +static void yaffs2_checkpt_find_erased_block(yaffs_dev_t *dev)
    +{
    + int i;
    + int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks;
    + T(YAFFS_TRACE_CHECKPOINT,
    + (TSTR("allocating checkpt block: erased %d reserved %d avail %d next %d "TENDSTR),
    + dev->n_erased_blocks, dev->param.n_reserved_blocks, blocks_avail, dev->checkpt_next_block));
    +
    + if (dev->checkpt_next_block >= 0 &&
    + dev->checkpt_next_block <= dev->internal_end_block &&
    + blocks_avail > 0) {
    +
    + for (i = dev->checkpt_next_block; i <= dev->internal_end_block; i++) {
    + yaffs_block_info_t *bi = yaffs_get_block_info(dev, i);
    + if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
    + dev->checkpt_next_block = i + 1;
    + dev->checkpt_cur_block = i;
    + T(YAFFS_TRACE_CHECKPOINT, (TSTR("allocating checkpt block %d"TENDSTR), i));
    + return;
    + }
    + }
    + }
    + T(YAFFS_TRACE_CHECKPOINT, (TSTR("out of checkpt blocks"TENDSTR)));
    +
    + dev->checkpt_next_block = -1;
    + dev->checkpt_cur_block = -1;
    +}
    +
    +static void yaffs2_checkpt_find_block(yaffs_dev_t *dev)
    +{
    + int i;
    + yaffs_ext_tags tags;
    +
    + T(YAFFS_TRACE_CHECKPOINT, (TSTR("find next checkpt block: start: blocks %d next %d" TENDSTR),
    + 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;
    + int realigned_chunk = chunk - dev->chunk_offset;
    +
    + dev->param.read_chunk_tags_fn(dev, realigned_chunk,
    + NULL, &tags);
    + T(YAFFS_TRACE_CHECKPOINT, (TSTR("find next checkpt block: search: block %d oid %d seq %d eccr %d" TENDSTR),
    + i, tags.obj_id, tags.seq_number, tags.ecc_result));
    +
    + if (tags.seq_number == YAFFS_SEQUENCE_CHECKPOINT_DATA) {
    + /* 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++;
    + T(YAFFS_TRACE_CHECKPOINT, (TSTR("found checkpt block %d"TENDSTR), i));
    + return;
    + }
    + }
    +
    + T(YAFFS_TRACE_CHECKPOINT, (TSTR("found no more checkpt blocks"TENDSTR)));
    +
    + dev->checkpt_next_block = -1;
    + dev->checkpt_cur_block = -1;
    +}
    +
    +
    +int yaffs2_checkpt_open(yaffs_dev_t *dev, int writing)
    +{
    +
    +
    + dev->checkpt_open_write = writing;
    +
    + /* Got the functions we need? */
    + if (!dev->param.write_chunk_tags_fn ||
    + !dev->param.read_chunk_tags_fn ||
    + !dev->param.erase_fn ||
    + !dev->param.bad_block_fn)
    + return 0;
    +
    + if (writing && !yaffs2_checkpt_space_ok(dev))
    + return 0;
    +
    + if (!dev->checkpt_buffer)
    + dev->checkpt_buffer = YMALLOC_DMA(dev->param.total_bytes_per_chunk);
    + if (!dev->checkpt_buffer)
    + return 0;
    +
    +
    + dev->checkpt_page_seq = 0;
    + dev->checkpt_byte_count = 0;
    + dev->checkpt_sum = 0;
    + dev->checkpt_xor = 0;
    + dev->checkpt_cur_block = -1;
    + dev->checkpt_cur_chunk = -1;
    + dev->checkpt_next_block = dev->internal_start_block;
    +
    + /* Erase all the blocks in the checkpoint area */
    + if (writing) {
    + memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk);
    + dev->checkpt_byte_offs = 0;
    + return yaffs_checkpt_erase(dev);
    + } else {
    + int i;
    + /* Set to a value that will kick off a read */
    + dev->checkpt_byte_offs = dev->data_bytes_per_chunk;
    + /* A checkpoint block list of 1 checkpoint block per 16 block is (hopefully)
    + * going to be way more than we need */
    + dev->blocks_in_checkpt = 0;
    + dev->checkpt_max_blocks = (dev->internal_end_block - dev->internal_start_block)/16 + 2;
    + dev->checkpt_block_list = YMALLOC(sizeof(int) * dev->checkpt_max_blocks);
    + if(!dev->checkpt_block_list)
    + return 0;
    +
    + for (i = 0; i < dev->checkpt_max_blocks; i++)
    + dev->checkpt_block_list[i] = -1;
    + }
    +
    + return 1;
    +}
    +
    +int yaffs2_get_checkpt_sum(yaffs_dev_t *dev, __u32 *sum)
    +{
    + __u32 composite_sum;
    + composite_sum = (dev->checkpt_sum << 8) | (dev->checkpt_xor & 0xFF);
    + *sum = composite_sum;
    + return 1;
    +}
    +
    +static int yaffs2_checkpt_flush_buffer(yaffs_dev_t *dev)
    +{
    + int chunk;
    + int realigned_chunk;
    +
    + 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 */
    + yaffs_block_info_t *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;
    +
    +
    + T(YAFFS_TRACE_CHECKPOINT, (TSTR("checkpoint wite buffer nand %d(%d:%d) objid %d chId %d" TENDSTR),
    + chunk, dev->checkpt_cur_block, dev->checkpt_cur_chunk, tags.obj_id, tags.chunk_id));
    +
    + realigned_chunk = chunk - dev->chunk_offset;
    +
    + dev->n_page_writes++;
    +
    + dev->param.write_chunk_tags_fn(dev, realigned_chunk,
    + dev->checkpt_buffer, &tags);
    + dev->checkpt_byte_offs = 0;
    + 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);
    +
    + return 1;
    +}
    +
    +
    +int yaffs2_checkpt_wr(yaffs_dev_t *dev, const void *data, int n_bytes)
    +{
    + int i = 0;
    + int ok = 1;
    +
    +
    + __u8 * data_bytes = (__u8 *)data;
    +
    +
    +
    + if (!dev->checkpt_buffer)
    + return 0;
    +
    + if (!dev->checkpt_open_write)
    + return -1;
    +
    + while (i < n_bytes && ok) {
    + dev->checkpt_buffer[dev->checkpt_byte_offs] = *data_bytes;
    + dev->checkpt_sum += *data_bytes;
    + dev->checkpt_xor ^= *data_bytes;
    +
    + dev->checkpt_byte_offs++;
    + i++;
    + data_bytes++;
    + dev->checkpt_byte_count++;
    +
    +
    + if (dev->checkpt_byte_offs < 0 ||
    + dev->checkpt_byte_offs >= dev->data_bytes_per_chunk)
    + ok = yaffs2_checkpt_flush_buffer(dev);
    + }
    +
    + return i;
    +}
    +
    +int yaffs2_checkpt_rd(yaffs_dev_t *dev, void *data, int n_bytes)
    +{
    + int i = 0;
    + int ok = 1;
    + yaffs_ext_tags tags;
    +
    +
    + int chunk;
    + int realigned_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;
    + else {
    + chunk = dev->checkpt_cur_block *
    + dev->param.chunks_per_block +
    + dev->checkpt_cur_chunk;
    +
    + realigned_chunk = chunk - dev->chunk_offset;
    +
    + dev->n_page_reads++;
    +
    + /* read in the next chunk */
    + dev->param.read_chunk_tags_fn(dev,
    + realigned_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;
    +
    + dev->checkpt_byte_offs = 0;
    + dev->checkpt_page_seq++;
    + dev->checkpt_cur_chunk++;
    +
    + if (dev->checkpt_cur_chunk >= dev->param.chunks_per_block)
    + dev->checkpt_cur_block = -1;
    + }
    + }
    +
    + if (ok) {
    + *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;
    +}
    +
    +int yaffs_checkpt_close(yaffs_dev_t *dev)
    +{
    +
    + if (dev->checkpt_open_write) {
    + if (dev->checkpt_byte_offs != 0)
    + yaffs2_checkpt_flush_buffer(dev);
    + } else if(dev->checkpt_block_list){
    + int i;
    + for (i = 0; i < dev->blocks_in_checkpt && dev->checkpt_block_list[i] >= 0; i++) {
    + int blk = dev->checkpt_block_list[i];
    + yaffs_block_info_t *bi = NULL;
    + if( dev->internal_start_block <= blk && blk <= dev->internal_end_block)
    + bi = yaffs_get_block_info(dev, blk);
    + if (bi && bi->block_state == YAFFS_BLOCK_STATE_EMPTY)
    + bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT;
    + else {
    + /* Todo this looks odd... */
    + }
    + }
    + YFREE(dev->checkpt_block_list);
    + dev->checkpt_block_list = NULL;
    + }
    +
    + dev->n_free_chunks -= dev->blocks_in_checkpt * dev->param.chunks_per_block;
    + dev->n_erased_blocks -= dev->blocks_in_checkpt;
    +
    +
    + T(YAFFS_TRACE_CHECKPOINT, (TSTR("checkpoint byte count %d" TENDSTR),
    + dev->checkpt_byte_count));
    +
    + if (dev->checkpt_buffer) {
    + /* free the buffer */
    + YFREE(dev->checkpt_buffer);
    + dev->checkpt_buffer = NULL;
    + return 1;
    + } else
    + return 0;
    +}
    +
    +int yaffs2_checkpt_invalidate_stream(yaffs_dev_t *dev)
    +{
    + /* Erase the checkpoint data */
    +
    + T(YAFFS_TRACE_CHECKPOINT, (TSTR("checkpoint invalidate of %d blocks"TENDSTR),
    + dev->blocks_in_checkpt));
    +
    + return yaffs_checkpt_erase(dev);
    +}
    +
    +
    +
    diff --git a/drivers/staging/yaffs2/yaffs_checkptrw.h b/drivers/staging/yaffs2/yaffs_checkptrw.h
    new file mode 100644
    index 0000000..582b89c
    --- /dev/null
    +++ b/drivers/staging/yaffs2/yaffs_checkptrw.h
    @@ -0,0 +1,34 @@
    +/*
    + * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
    + *
    + * Copyright (C) 2002-2010 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 Lesser General Public License version 2.1 as
    + * published by the Free Software Foundation.
    + *
    + * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
    + */
    +
    +#ifndef __YAFFS_CHECKPTRW_H__
    +#define __YAFFS_CHECKPTRW_H__
    +
    +#include "yaffs_guts.h"
    +
    +int yaffs2_checkpt_open(yaffs_dev_t *dev, int writing);
    +
    +int yaffs2_checkpt_wr(yaffs_dev_t *dev, const void *data, int n_bytes);
    +
    +int yaffs2_checkpt_rd(yaffs_dev_t *dev, void *data, int n_bytes);
    +
    +int yaffs2_get_checkpt_sum(yaffs_dev_t *dev, __u32 *sum);
    +
    +int yaffs_checkpt_close(yaffs_dev_t *dev);
    +
    +int yaffs2_checkpt_invalidate_stream(yaffs_dev_t *dev);
    +
    +
    +#endif
    --
    1.7.3.2.146.gca209


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