page_zero_new

Name: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.

Proto:void page_zero_new_buffers(struct page *page, unsigned from, unsigned to)

Type:void

Parameter:

Type	Parameter	Name
struct page *	page
unsigned	from
unsigned	to

1883

BUG_ON(!PageLocked(page))

1884

If Not page_has_buffers(page) Then Return

1887

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

1888

block_start = 0

1889

1890

block_end = block_start + size of mapping

1892

If buffer_new(bh) Then

1893

If block_end > from && block_start < to Then

1894

If Not PageUptodate(page) Then

1897

start = max - return maximum of two values of the same or compatible types*@x: first value*@y: second value(from, block_start)

1898

size = min - return minimum of two values of the same or compatible types*@x: first value*@y: second value(to, block_end) - 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 = block_end

1910

bh = circular list of page's buffers

1911

When bh != head cycle

**Caller**
Name	Describe
__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.

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