int _FTL_READ(int32_t sector_nb, unsigned int length)
{
#ifdef FTL_DEBUG
printf("[%s] Start\n",__FUNCTION__);
#endif
if(sector_nb + length > SECTOR_NB){
printf("Error[FTL_READ] Exceed Sector number\n");
return FAIL;
}
unsigned int remain = length;
unsigned int lba = sector_nb;
unsigned int left_skip = sector_nb % SECTORS_PER_PAGE;
unsigned int right_skip;
unsigned int read_sects;
unsigned int phy_flash_nb;
unsigned int phy_block_nb;
unsigned int phy_page_nb;
unsigned int ret = SUCCESS;
unsigned int ret_seq, ret_ran_hot, ret_ran_cold, ret_data;
int read_page_offset = 0;
int io_page_nb;
#ifdef FIRM_IO_BUFFER
INCREASE_RB_FTL_POINTER(length);
#endif
while(remain > 0){
if(remain > SECTORS_PER_PAGE - left_skip){
right_skip = 0;
}
else{
right_skip = SECTORS_PER_PAGE - left_skip - remain;
}
read_sects = SECTORS_PER_PAGE - left_skip - right_skip;
ret_seq = FIND_PAGE_IN_SEQ_LOG(lba, &phy_flash_nb, &phy_block_nb, &phy_page_nb);
if(ret_seq != SUCCESS){
ret_ran_hot = FIND_PAGE_IN_RAN_HOT_LOG(lba, &phy_flash_nb, &phy_block_nb, &phy_page_nb);
}
if(ret_seq != SUCCESS && ret_ran_hot != SUCCESS){
ret_ran_cold = FIND_PAGE_IN_RAN_COLD_LOG(lba, &phy_flash_nb, &phy_block_nb, &phy_page_nb);
}
if(ret_seq != SUCCESS && ret_ran_hot != SUCCESS && ret_ran_cold != SUCCESS){
ret_data = FIND_PAGE_IN_DATA_BLOCK(lba, &phy_flash_nb, &phy_block_nb, &phy_page_nb);
}
if(ret_seq != SUCCESS && ret_ran_hot != SUCCESS && ret_ran_cold != SUCCESS && ret_data != SUCCESS){
#ifdef FTL_DEBUG
printf("Error[FTL_READ] No Mapping info\n");
#endif
#ifdef FIRM_IO_BUFFER
INCREASE_RB_LIMIT_POINTER();
#endif
return FAIL;
}
lba += read_sects;
remain -= read_sects;
left_skip = 0;
}
io_alloc_overhead = ALLOC_IO_REQUEST(sector_nb, length, READ, &io_page_nb);
remain = length;
lba = sector_nb;
left_skip = sector_nb % SECTORS_PER_PAGE;
while(remain > 0){
if(remain > SECTORS_PER_PAGE - left_skip){
right_skip = 0;
}
else{
right_skip = SECTORS_PER_PAGE - left_skip - remain;
}
read_sects = SECTORS_PER_PAGE - left_skip - right_skip;
ret_seq = FIND_PAGE_IN_SEQ_LOG(lba, &phy_flash_nb, &phy_block_nb, &phy_page_nb);
if(ret_seq != SUCCESS){
ret_ran_hot = FIND_PAGE_IN_RAN_HOT_LOG(lba, &phy_flash_nb, &phy_block_nb, &phy_page_nb);
}
if(ret_seq != SUCCESS && ret_ran_hot != SUCCESS){
ret_ran_cold = FIND_PAGE_IN_RAN_COLD_LOG(lba, &phy_flash_nb, &phy_block_nb, &phy_page_nb);
}
if(ret_seq != SUCCESS && ret_ran_hot != SUCCESS && ret_ran_cold != SUCCESS){
ret_data = FIND_PAGE_IN_DATA_BLOCK(lba, &phy_flash_nb, &phy_block_nb, &phy_page_nb);
}
if(ret_seq != SUCCESS && ret_ran_hot != SUCCESS && ret_ran_cold != SUCCESS && ret_data != SUCCESS){
#ifdef FTL_DEBUG
printf("Error[FTL_READ] No Mapping info\n");
#endif
}
else{
ret = SSD_PAGE_READ(phy_flash_nb, phy_block_nb, phy_page_nb, read_page_offset, READ, io_page_nb);
}
if(ret == SUCCESS){
#ifdef FTL_DEBUG
printf("[FTL_READ] Complete [%d, %d, %d] from ",phy_flash_nb, phy_block_nb, phy_page_nb);
if(ret_seq == SUCCESS){
printf("SEQ Block\n");
}
else if(ret_ran_hot == SUCCESS){
printf("RAN HOT Block\n");
}
else if(ret_ran_cold == SUCCESS){
printf("RAN COLD Block\n");
}
else if(ret_data == SUCCESS){
printf("DATA Block\n");
}
else{
printf("No Map\n");
}
#endif
}
else if(ret == FAIL){
printf("Error[FTL_READ] %d page read fail \n", phy_page_nb);
}
read_page_offset++;
lba += read_sects;
remain -= read_sects;
left_skip = 0;
}
INCREASE_IO_REQUEST_SEQ_NB();
#ifdef FIRM_IO_BUFFER
INCREASE_RB_LIMIT_POINTER();
#endif
#ifdef MONITOR_ON
char szTemp[1024];
sprintf(szTemp, "READ PAGE %d ", length);
WRITE_LOG(szTemp);
#endif
#ifdef FTL_DEBUG
printf("[%s] End\n",__FUNCTION__);
#endif
return ret;
}
void COPY_DATA_TO_READ_BUFFER(event_queue_entry* dst_entry, event_queue_entry* src_entry)
{
#ifdef FIRM_IO_BUF_DEBUG
printf("[%s] Start.\n",__FUNCTION__);
#endif
if(dst_entry == NULL || src_entry == NULL){
printf("[%s] Null pointer error.\n",__FUNCTION__);
return;
}
int count = 0;
int offset;
void* dst_buf; // new read entry
void* src_buf; // write entry
int32_t dst_sector_nb = dst_entry->sector_nb;
int32_t src_sector_nb = src_entry->sector_nb;
unsigned int dst_length = dst_entry->length;
/* Update read entry buffer pointer */
dst_buf = dst_entry->buf;
/* Calculate write buffer frame address */
src_buf = src_entry->buf;
offset = dst_sector_nb - src_sector_nb;
while(count != offset){
if(GET_WB_VALID_ARRAY_ENTRY(src_buf)!='I'){
count++;
}
src_buf = src_buf + SECTOR_SIZE;
if(src_buf == write_buffer_end){
src_buf = write_buffer;
}
}
count = 0;
while(count != dst_length){
if(GET_WB_VALID_ARRAY_ENTRY(src_buf)=='I'){
src_buf = src_buf + SECTOR_SIZE;
if(src_buf == write_buffer_end){
src_buf = write_buffer;
}
continue;
}
/* Copy Write Buffer Data to Read Buffer */
memcpy(dst_buf, src_buf, SECTOR_SIZE);
/* Increase offset */
dst_buf = dst_buf + SECTOR_SIZE;
src_buf = src_buf + SECTOR_SIZE;
ftl_read_ptr = ftl_read_ptr + SECTOR_SIZE;
if(dst_buf == read_buffer_end){
dst_buf = read_buffer;
ftl_read_ptr = read_buffer;
}
if(src_buf == write_buffer_end){
src_buf = write_buffer;
}
count++;
}
INCREASE_RB_LIMIT_POINTER();
#ifdef FIRM_IO_BUF_DEBUG
printf("[%s] End.\n",__FUNCTION__);
#endif
}
