simple_write

函数名称：simple_write_begin

函数原型：int simple_write_begin(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned flags, struct page **pagep, void **fsdata)

返回类型：int

参数：

类型	参数	名称
struct file *	file
struct address_space *	mapping
loff_t	pos
unsigned	len
unsigned	flags
struct page **	pagep
void **	fsdata

457

index等于pos右移PAGE_SHIFT determines the page size 位

459

page等于Find or create a page at the given pagecache position. Return the locked* page. This function is specifically for buffered writes.

460

如果非page则返回:负ENOMEM

463

pagep等于page

465

如果非PageUptodate(page)且len不等于PAGE_SIZE则

466

from等于pos按位与PAGE_SIZE减1

468

zero_user_segments(page, 0, from, from + len, PAGE_SIZE)

470

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