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mm: add end_buffer_read helper function

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Move duplicated code from end_buffer_read_XXX methods to separate helper
function.

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dmitry Monakhov 2007-10-16 01:24:47 -07:00 committed by Linus Torvalds
parent ef8b4520bd
commit 68671f35fe
1 changed files with 17 additions and 15 deletions
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32
fs/buffer.c
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@ -110,10 +110,14 @@ static void buffer_io_error(struct buffer_head *bh)
}
/*
* Default synchronous end-of-IO handler.. Just mark it up-to-date and
* unlock the buffer. This is what ll_rw_block uses too.
* End-of-IO handler helper function which does not touch the bh after
* unlocking it.
* Note: unlock_buffer() sort-of does touch the bh after unlocking it, but
* a race there is benign: unlock_buffer() only use the bh's address for
* hashing after unlocking the buffer, so it doesn't actually touch the bh
* itself.
*/
void end_buffer_read_sync(struct buffer_head *bh, int uptodate)
static void __end_buffer_read_notouch(struct buffer_head *bh, int uptodate)
{
if (uptodate) {
set_buffer_uptodate(bh);
@ -122,6 +126,15 @@ void end_buffer_read_sync(struct buffer_head *bh, int uptodate)
clear_buffer_uptodate(bh);
}
unlock_buffer(bh);
}
/*
* Default synchronous end-of-IO handler.. Just mark it up-to-date and
* unlock the buffer. This is what ll_rw_block uses too.
*/
void end_buffer_read_sync(struct buffer_head *bh, int uptodate)
{
__end_buffer_read_notouch(bh, uptodate);
put_bh(bh);
}
@ -2245,21 +2258,10 @@ block_page_mkwrite(struct vm_area_struct *vma, struct page *page,
* nobh_prepare_write()'s prereads are special: the buffer_heads are freed
* immediately, while under the page lock. So it needs a special end_io
* handler which does not touch the bh after unlocking it.
*
* Note: unlock_buffer() sort-of does touch the bh after unlocking it, but
* a race there is benign: unlock_buffer() only use the bh's address for
* hashing after unlocking the buffer, so it doesn't actually touch the bh
* itself.
*/
static void end_buffer_read_nobh(struct buffer_head *bh, int uptodate)
{
if (uptodate) {
set_buffer_uptodate(bh);
} else {
/* This happens, due to failed READA attempts. */
clear_buffer_uptodate(bh);
}
unlock_buffer(bh);
__end_buffer_read_notouch(bh, uptodate);
}
/*