iomap_is_partially

函数名称：map_is_partially_uptodate checks whether blocks within a page are* uptodate or not.* Returns true if all blocks which correspond to a file portion* we want to read within the page are uptodate.

函数原型：int iomap_is_partially_uptodate(struct page *page, unsigned long from, unsigned long count)

返回类型：int

参数：

类型	参数	名称
struct page *	page
unsigned long	from
unsigned long	count

480

iop等于to_iomap_page(page)

481

inode等于host

486

len等于min_t - return minimum of two values, using the specified type*@type: data type to use*@x: first value*@y: second value(unsigned, PAGE_SIZE - from, count)

489

first等于from右移i_blkbits位

490

last等于from加len减1右移i_blkbits位

492

如果iop则

493

以i小于等于last 循环如果非st_bit - Determine whether a bit is set*@nr: bit number to test*@addr: Address to start counting from则

495

返回:0

496

返回:1

499

返回:0

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码

函数逻辑报告