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Clean up and export cancel_dirty_page() to modules

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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: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Linus Torvalds 2006-12-23 09:25:04 -08:00
parent 18ed1c0513
commit 8368e328df
1 changed files with 8 additions and 4 deletions
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12
mm/truncate.c
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@ -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)) {
dec_zone_page_state(page, NR_FILE_DIRTY);
task_io_account_cancelled_write(account_size);
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