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mm: write_cache_pages cleanups

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Get rid of some complex expressions from flow control statements, add a
comment, remove some duplicate code.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Dave Chinner <david@fromorbit.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nick Piggin 2009-01-06 14:39:09 -08:00 committed by Linus Torvalds
parent 05fe478dd0
commit 5a3d5c9813
1 changed files with 22 additions and 12 deletions
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34
mm/page-writeback.c
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@ -899,11 +899,14 @@ int write_cache_pages(struct address_space *mapping,
}
retry:
done_index = index;
while (!done && (index <= end) &&
(nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
PAGECACHE_TAG_DIRTY,
min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) {
unsigned i;
while (!done && (index <= end)) {
int i;
nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
PAGECACHE_TAG_DIRTY,
min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
if (nr_pages == 0)
break;
for (i = 0; i < nr_pages; i++) {
struct page *page = pvec.pages[i];
@ -919,7 +922,16 @@ int write_cache_pages(struct address_space *mapping,
*/
lock_page(page);
/*
* Page truncated or invalidated. We can freely skip it
* then, even for data integrity operations: the page
* has disappeared concurrently, so there could be no
* real expectation of this data interity operation
* even if there is now a new, dirty page at the same
* pagecache address.
*/
if (unlikely(page->mapping != mapping)) {
continue_unlock:
unlock_page(page);
continue;
}
@ -930,18 +942,15 @@ int write_cache_pages(struct address_space *mapping,
* end == -1 in that case.
*/
done = 1;
unlock_page(page);
continue;
goto continue_unlock;
}
if (wbc->sync_mode != WB_SYNC_NONE)
wait_on_page_writeback(page);
if (PageWriteback(page) ||
!clear_page_dirty_for_io(page)) {
unlock_page(page);
continue;
}
!clear_page_dirty_for_io(page))
goto continue_unlock;
ret = (*writepage)(page, wbc, data);
if (unlikely(ret)) {
@ -964,7 +973,8 @@ int write_cache_pages(struct address_space *mapping,
}
if (wbc->sync_mode == WB_SYNC_NONE) {
if (--wbc->nr_to_write <= 0)
wbc->nr_to_write--;
if (wbc->nr_to_write <= 0)
done = 1;
}
if (wbc->nonblocking && bdi_write_congested(bdi)) {