page_zero_new

函数名称：If a page has any new buffers, zero them out here, and mark them uptodate* and dirty so they'll be written out (in order to prevent uninitialised* block data from leaking). And clear the new bit.

函数原型：void page_zero_new_buffers(struct page *page, unsigned from, unsigned to)

返回类型：void

参数：

类型	参数	名称
struct page *	page
unsigned	from
unsigned	to

1883

BUG_ON(!PageLocked(page))

1884

如果非page_has_buffers(page)则返回

1887

bh等于head等于If we *know* page->private refers to buffer_heads (page)

1888

block_start等于0

1889

循环

1890

block_end等于block_start加 size of mapping

1892

如果buffer_new(bh)则

1893

如果block_end大于from且block_start小于to则

1894

如果非PageUptodate(page)则

1897

start等于两数取大(from, block_start)

1898

size等于两数取小(to, block_end)减start

1900

zero_user(page, start, size)

1901

Emit the buffer bitops functions. Note that there are also functions* of the form "mark_buffer_foo()". These are higher-level functions which* do something in addition to setting a b_state bit.

1904

clear_buffer_new(bh)

1905

mark_buffer_dirty - mark a buffer_head as needing writeout*@bh: the buffer_head to mark dirty* mark_buffer_dirty() will set the dirty bit against the buffer, then set* its backing page dirty, then tag the page as dirty in the page cache* and then attach

1909

block_start等于block_end

1910

bh等于 circular list of page's buffers

1911

当bh不等于head 循环

**调用者**
名称	描述
__block_write_begin_int
block_write_end
nobh_write_begin	On entry, the page is fully not uptodate.* On exit the page is fully uptodate in the areas outside (from,to)* The filesystem needs to handle block truncation upon failure.

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