int general_file_write(struct m_inode *inode,struct file *filp,char *buf,int count)
{
int i = 0,block_nr,c;
off_t pos = 0;
char *p = NULL;
struct buffer_head *bh = NULL;
int nr_start_sect = 0;
printk("write 5");
if(!inode || !filp || !buf || count < 0)
{
printk("write parameters error.");
return -EINVAL;
}
/*int nr_start_sect = inode->i_start_sect;*/
if((nr_start_sect = get_first_block(inode)) == 0)
{
set_block_nums(inode->i_dev ,(struct d_inode *)inode, NR_DEFAULT_SECTS);
if((nr_start_sect = get_first_block(inode)) == 0)
return -3;
}
printk("write num = %d.start_sect = %d.",inode->i_num, nr_start_sect);
if(filp->f_flag & O_APPEND)
pos = inode->i_size;
else
pos = filp->f_pos;
while(i < count)
{
/*block = nr_start_sect + pos/SECTOR_SIZE;*/
block_nr = get_pos_block(inode, pos);
bh = getblk(inode->i_dev,block_nr);
c = pos % SECTOR_SIZE;
p = bh->b_data + c;
c = SECTOR_SIZE -c;
if(c > count)
c = count - i;
pos += c;
i += c;
if(pos > inode->i_size)
{
inode->i_size = pos;
}
while(c-- > 0)
*(p++) = *(buf++);
hd_rw(inode->i_dev,block_nr,1,ATA_WRITE,bh);
brelse(bh);
}
inode->i_dirty = 1;
return 0;
}
//读文件
int general_file_read(struct m_inode *inode,struct file *filp,char *buf,int count)
{
int i,c,m = 0;
char *p;
// char *ptr = buf;
struct buffer_head *bh;
struct dir_entry *de;
int block_nr = 0;
if(!inode || !filp)
return -EINVAL;
if(!buf || count <= 0)
return 0;
int nr_start_sect = get_first_block(inode);
printk("read num = %d.start_sect = %d.",inode->i_num, nr_start_sect);
// printk("inode->i_dev = %d inode->i_num = %d inode->i_start_sect = %d\n",inode->i_dev,inode->i_num,inode->i_start_sect);
//文件所占的磁盘块总数
off_t pos = filp->f_pos;
//开始读取的磁盘块
nr_start_sect += pos/SECTOR_SIZE;
// nr_sects = (inode->i_size + SECTOR_SIZE -1)/SECTOR_SIZE;
while(i < count)
{
block_nr = get_pos_block(inode, pos);
c = pos % SECTOR_SIZE;
c = SECTOR_SIZE -c ;
if(c > count)
{
c = count - i;
}
// printk("file_read : inode->i_dev = %d nr_start_sect = %d count = %d\n",inode->i_dev,nr_start_sect + pos/SECTOR_SIZE,count);
bh = getblk(inode->i_dev,block_nr);
hd_rw(inode->i_dev,block_nr,1,ATA_READ,bh);
p = bh->b_data + pos;
de = (struct dir_entry*)bh->b_data;
// printk("de->file_name = %s\n",(++de)->file_name);
filp->f_pos += c;
pos += c;
i += c;
m++;
// printk("c = %d\n",c);
while(c-- > 0)
{
if(*p == 0)
{
p++;
continue;
}
else
{
*buf = *p;
// printk("%d %c %c\t",512 - c,*p,*buf);
buf++;
p++;
}
}
brelse(bh);
}
return 0;
}
void read_thread(void *args)
{
transfer_session *session;
file_desc *f_desc;
file_block_desc *b_desc;
frame_index *f_index, *last_index;
FILE *fp = NULL;
int err;
int i = 0;
session = (transfer_session *)args;
f_desc = session->f_desc;
for(;;)
{
if(session->state != STATE_TRANSFER)
{
/* if state = finish, close file and exit the thread */
if(fp)
{
fclose(fp);
fp = NULL;
}
sleep(1);
continue;
}
if(NULL == fp)
{
if(NULL == (fp = fopen(f_desc->file_name, "r")))
{
t_log("open file error");
continue;
}
}
b_desc = get_first_block(f_desc);
if(b_desc == ERR_BLOCK_LIST_NULL)
return;
else if(b_desc == ERR_BLOCK_LIST_EMPTY)
{
sleep(1);
continue;
}
else
{
if(b_desc->retry_flag == ORIGIN_FRAME)
{
f_index = b_desc->index;
for(i = 1; i <= MAX_FRAME_COUNT; i++)
{
f_index->frame_index = i;
if(read_file_to_msg_q(f_index, f_desc, fp, session->data_qid) < 0)
break;
}
t_free(f_index);
}
else if(b_desc->retry_flag == RETRAN_FRAME)
{
printf("read_thread re tran\n");
f_index = b_desc->index;
if(f_index->frame_index == 0XFFFF)
{
for(i = 1; i <= MAX_FRAME_COUNT; i++)
{
f_index->frame_index = i;
read_file_to_msg_q(f_index, f_desc, fp, session->data_qid);
}
t_free(f_index);
}
else
{
do
{
read_file_to_msg_q(f_index, f_desc, fp, session->data_qid);
last_index = f_index;
f_index = f_index->next;
t_free(last_index);
}while(f_index);
}
}
}
t_free(b_desc);
// printf("block:%d\n", b_desc->index->block_index);
}
return;
}
