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Commit 8368e328 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Clean up and export cancel_dirty_page() to modules 



Make cancel_dirty_page() act more like all the other dirty and writeback
accounting functions: test for "mapping" being NULL, and do the
NR_FILE_DIRY accounting purely based on mapping_cap_account_dirty()).

Also, add it to the exports, so that modular filesystems can use it.

Acked-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 18ed1c05

mm/truncate.c

+8 −4
Original line number Diff line number Diff line
@@ -60,12 +60,16 @@ void cancel_dirty_page(struct page *page, unsigned int account_size) 
		WARN_ON(++warncount < 5);

	}

		

	if (TestClearPageDirty(page) && account_size &&

			mapping_cap_account_dirty(page->mapping)) {

	if (TestClearPageDirty(page)) {

		struct address_space *mapping = page->mapping;

		if (mapping && mapping_cap_account_dirty(mapping)) {

			dec_zone_page_state(page, NR_FILE_DIRTY);

			if (account_size)

				task_io_account_cancelled_write(account_size);

		}

	}

}

EXPORT_SYMBOL(cancel_dirty_page);



/*

 * If truncate cannot remove the fs-private metadata from the page, the page