static int dir_commit_chunk(struct page *page, unsigned from, unsigned to)
{
struct inode *dir = (struct inode *)page->mapping->host;
int err = 0;
page->mapping->a_ops->commit_write(NULL, page, from, to);
if (IS_DIRSYNC(dir))
err = write_one_page(page, 1);
else
unlock_page(page);
return err;
}
int btrfs_write_marked_extents(struct btrfs_root *root,
struct extent_io_tree *dirty_pages, int mark)
{
int ret;
int err = 0;
int werr = 0;
struct page *page;
struct inode *btree_inode = root->fs_info->btree_inode;
u64 start = 0;
u64 end;
unsigned long index;
while (1) {
ret = find_first_extent_bit(dirty_pages, start, &start, &end,
mark);
if (ret)
break;
while (start <= end) {
cond_resched();
index = start >> PAGE_CACHE_SHIFT;
start = (u64)(index + 1) << PAGE_CACHE_SHIFT;
page = find_get_page(btree_inode->i_mapping, index);
if (!page)
continue;
btree_lock_page_hook(page);
if (!page->mapping) {
unlock_page(page);
page_cache_release(page);
continue;
}
if (PageWriteback(page)) {
if (PageDirty(page))
wait_on_page_writeback(page);
else {
unlock_page(page);
page_cache_release(page);
continue;
}
}
err = write_one_page(page, 0);
if (err)
werr = err;
page_cache_release(page);
}
}
if (err)
werr = err;
return werr;
}
static int dir_commit_chunk(struct page *page, loff_t pos, unsigned len)
{
struct address_space *mapping = page->mapping;
struct inode *dir = mapping->host;
int err = 0;
block_write_end(NULL, mapping, pos, len, len, page, NULL);
if (pos+len > dir->i_size) {
i_size_write(dir, pos+len);
mark_inode_dirty(dir);
}
if (IS_DIRSYNC(dir))
err = write_one_page(page, 1);
else
unlock_page(page);
return err;
}
/*
* write out a page to a file
*/
static int write_page(struct bitmap *bitmap, struct page *page, int wait)
{
int ret = -ENOMEM;
if (bitmap->file == NULL)
return write_sb_page(bitmap->mddev, bitmap->offset, page, wait);
flush_dcache_page(page); /* make sure visible to anyone reading the file */
if (wait)
lock_page(page);
else {
if (TestSetPageLocked(page))
return -EAGAIN; /* already locked */
if (PageWriteback(page)) {
unlock_page(page);
return -EAGAIN;
}
}
ret = page->mapping->a_ops->prepare_write(bitmap->file, page, 0, PAGE_SIZE);
if (!ret)
ret = page->mapping->a_ops->commit_write(bitmap->file, page, 0,
PAGE_SIZE);
if (ret) {
unlock_page(page);
return ret;
}
set_page_dirty(page); /* force it to be written out */
if (!wait) {
/* add to list to be waited for by daemon */
struct page_list *item = mempool_alloc(bitmap->write_pool, GFP_NOIO);
item->page = page;
get_page(page);
spin_lock(&bitmap->write_lock);
list_add(&item->list, &bitmap->complete_pages);
spin_unlock(&bitmap->write_lock);
md_wakeup_thread(bitmap->writeback_daemon);
}
return write_one_page(page, wait);
}
//主程序
void main(void)
{
uint i = 0;
uint timercount = 0;
uchar packNO = 1;
uint bufferPoint = 0;
uint crc;
#ifdef UPDATE_USB
uchar s;
uint j;
unsigned long UpdateSize = 0;
uint LabCount = 0,lastdatanum = 0;
uchar string[50] = {0};
#endif
//初始化M128的USART0
UBRR0L = BAUD_L; //Set baud rate
UBRR0H = BAUD_H;
UCSR0B = ((1<<RXEN0)|(1<<TXEN0)); //接收器与发送器使能；
UCSR0C = (1<<USBS0)|(3<<UCSZ00); //设置帧格式: 8 个数据位, 1 个停止位；
#ifdef UPDATE_USB
//初始化M128的USART1
UBRR1L = 8;
UBRR1H = 0;
UCSR1B = ((1<<RXEN1)|(1<<TXEN1)); //接收器与发送器使能；
UCSR1C = (1<<USBS1)|(3<<UCSZ10); //设置帧格式: 8 个数据位, 1 个停止位；
#endif
//初始化M128的T/C0，15ms自动重载
OCR0 = 0x75;
TCCR0 = 0x0F;
TCNT0 = 0;
DDRB.0 = 1;
PORTB.0 = 1;
/*
USART_Send_string(a4String1);
while(uart_getchar()!='O');
while(uart_getchar()!='K');
USART_Send_string(a4String2);
while(uart_getchar()!='O');
while(uart_getchar()!='K');
*/
USART_Send_string(startupString);//向PC机发送开始提示信息
while(1)
{
if(uart_getchar()=='d')break;
if(TIFR&0x02)
{
if(++timercount>500) //若没有进入串口升级模式，则进入U盘升级模式 200*15ms=3s
{
#ifdef UPDATE_USB
sprintf((char*)string,"Enter the USB_Disk Update!\n",UpdateSize);
USART_Send_string(string);
//++++++++++++++++初始化CH376S++++++++++++++++++++++++
//CH376_PORT_INIT( ); /* 接口硬件初始化 */
xWriteCH376Cmd(CMD11_CHECK_EXIST); /* 测试单片机与CH376之间的通讯接口 */
xWriteCH376Data(0x65);
s = xReadCH376Data( );
if (s != 0x9A)
uart_putchar(ERR_USB_UNKNOWN); /* 通讯接口不正常,可能原因有:接口连接异常,其它设备影响(片选不唯一),串口波特率,一直在复位,晶振不工作 */
xWriteCH376Cmd(CMD11_SET_USB_MODE); /* 设备USB工作模式 */
xWriteCH376Data(0x06);
s = xReadCH376Data( );
if (s != CMD_RET_SUCCESS)
{
sprintf((char*)string,"USB_Disk is wrong init!\n",UpdateSize);
USART_Send_string(string);
quit();
}
//++++++++++++++++++++++END+++++++++++++++++++++++++++++++++
//检查U盘是否连接好
i = 0;
while(CH376DiskConnect() != USB_INT_SUCCESS)
{
if(++i > 5)
{
sprintf((char*)string,"USB_Disk is not Connection!\n",UpdateSize);
USART_Send_string(string);
quit();
}
delay_ms(100);
}
i = 0;
// 对于检测到USB设备的,最多等待10*50mS
if(CH376DiskMount() != USB_INT_SUCCESS)
{
if(++i > 5)
{
sprintf((char*)string,"USB_Disk Test Wrong!\n",UpdateSize);
USART_Send_string(string);
quit();
}
delay_ms(100);
}
//打开升级文件
s = CH376FileOpen("J8A-1.U");//每台机子，对应升级文件。
if (s == ERR_MISS_FILE) //没有找到升级文件则退出
{
CH376FileClose(TRUE);
sprintf((char*)string,"I can't fined the Update_File!\n",UpdateSize);
USART_Send_string(string);
quit();
}
UpdateSize = CH376GetFileSize();
sprintf((char*)string,"The Update_File size is :%dl\n",UpdateSize);
USART_Send_string(string);
LabCount = UpdateSize/SPM_PAGESIZE;
lastdatanum = UpdateSize%SPM_PAGESIZE;
if(lastdatanum)
LabCount++;
if(LabCount > (512-32))//mega128的flash页数
{
sprintf((char*)string,"The Update_File size is too big!",UpdateSize);
USART_Send_string(string);
CH376FileClose(FALSE);
quit();
}
//读取升级文件数据
for(i = 0; i < LabCount; i++)
{
if(lastdatanum && (i == (LabCount - 1)))
{
CH376ByteRead(data, lastdatanum, NULL);
for(j = lastdatanum; j < SPM_PAGESIZE; j++)
data[j] = 0xFF;
}
else
CH376ByteRead(data, SPM_PAGESIZE, NULL);
write_one_page();
address = address + SPM_PAGESIZE; //Flash页加1
}
//write_one_page(); //收到256字节写入一页Flash中
//address = address + SPM_PAGESIZE; //Flash页加1
//关闭文件
CH376FileClose(FALSE);
#endif
quit();
}
TIFR=TIFR|0x02;
}
}
//每秒向PC机发送一个控制字符"C"，等待控制字〈soh〉
while(uart_getchar()!= XMODEM_SOH) //receive the start of Xmodem
{
if(TIFR & 0x02) //timer0 over flow
{
if(++timercount > 100) //wait about 1 second
{
uart_putchar(XMODEM_RECIEVING_WAIT_CHAR); //send a "C"
timercount = 0;
}
TIFR = TIFR&0x02;
}
}
//开始接收数据块
do
{
if ((packNO == uart_waitchar()) && (packNO ==(~uart_waitchar())))
{ //核对数据块编号正确
for(i=0;i<128;i++) //接收128个字节数据
{
data[bufferPoint]= uart_waitchar();
bufferPoint++;
}
crc = (uint)(uart_waitchar())<<8;
crc = crc | uart_waitchar(); //接收2个字节的CRC效验字
if(calcrc(&data[bufferPoint-128],128) == crc) //CRC校验验证
{ //正确接收128个字节数据
while(bufferPoint >= SPM_PAGESIZE)
{ //正确接受256个字节的数据
write_one_page(); //收到256字节写入一页Flash中
address = address + SPM_PAGESIZE; //Flash页加1
bufferPoint = 0;
}
uart_putchar(XMODEM_ACK); //正确收到一个数据块
packNO++; //数据块编号加1
}
else
{
uart_putchar(XMODEM_NAK); //要求重发数据块
}
}
else
{
uart_putchar(XMODEM_NAK); //要求重发数据块
}
}while(uart_waitchar()!=XMODEM_EOT); //循环接收，直到全部发完
uart_putchar(XMODEM_ACK); //通知PC机全部收到
if(bufferPoint) write_one_page(); //把剩余的数据写入Flash中
quit(); //退出Bootloader程序，从0x0000处执行应用程序
}
/*
* prepare to perform part of a write to a page
*/
int afs_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
{
struct afs_vnode *vnode = AFS_FS_I(file_inode(file));
struct page *page;
struct key *key = afs_file_key(file);
unsigned long priv;
unsigned f, from = pos & (PAGE_SIZE - 1);
unsigned t, to = from + len;
pgoff_t index = pos >> PAGE_SHIFT;
int ret;
_enter("{%x:%u},{%lx},%u,%u",
vnode->fid.vid, vnode->fid.vnode, index, from, to);
/* We want to store information about how much of a page is altered in
* page->private.
*/
BUILD_BUG_ON(PAGE_SIZE > 32768 && sizeof(page->private) < 8);
page = grab_cache_page_write_begin(mapping, index, flags);
if (!page)
return -ENOMEM;
if (!PageUptodate(page) && len != PAGE_SIZE) {
ret = afs_fill_page(vnode, key, pos & PAGE_MASK, PAGE_SIZE, page);
if (ret < 0) {
unlock_page(page);
put_page(page);
_leave(" = %d [prep]", ret);
return ret;
}
SetPageUptodate(page);
}
/* page won't leak in error case: it eventually gets cleaned off LRU */
*pagep = page;
try_again:
/* See if this page is already partially written in a way that we can
* merge the new write with.
*/
t = f = 0;
if (PagePrivate(page)) {
priv = page_private(page);
f = priv & AFS_PRIV_MAX;
t = priv >> AFS_PRIV_SHIFT;
ASSERTCMP(f, <=, t);
}
if (f != t) {
if (PageWriteback(page)) {
trace_afs_page_dirty(vnode, tracepoint_string("alrdy"),
page->index, priv);
goto flush_conflicting_write;
}
/* If the file is being filled locally, allow inter-write
* spaces to be merged into writes. If it's not, only write
* back what the user gives us.
*/
if (!test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags) &&
(to < f || from > t))
goto flush_conflicting_write;
if (from < f)
f = from;
if (to > t)
t = to;
} else {
f = from;
t = to;
}
priv = (unsigned long)t << AFS_PRIV_SHIFT;
priv |= f;
trace_afs_page_dirty(vnode, tracepoint_string("begin"),
page->index, priv);
SetPagePrivate(page);
set_page_private(page, priv);
_leave(" = 0");
return 0;
/* The previous write and this write aren't adjacent or overlapping, so
* flush the page out.
*/
flush_conflicting_write:
_debug("flush conflict");
ret = write_one_page(page);
if (ret < 0) {
_leave(" = %d", ret);
return ret;
}
ret = lock_page_killable(page);
if (ret < 0) {
_leave(" = %d", ret);
return ret;
}
goto try_again;
}
