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[PATCH] truncate: dirty memory accounting fix

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Only (un)account for IO and page-dirtying for devices which have real backing
store (ie: not tmpfs or ramdisks).

Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andrew Morton 2006-12-22 01:04:48 -08:00 committed by Linus Torvalds
parent bb4067e341
commit 5f2a105d5e
1 changed files with 2 additions and 1 deletions
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mm/truncate.c
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@ -60,7 +60,8 @@ void cancel_dirty_page(struct page *page, unsigned int account_size)
WARN_ON(++warncount < 5); WARN_ON(++warncount < 5);
} }
if (TestClearPageDirty(page) && account_size) { if (TestClearPageDirty(page) && account_size &&
mapping_cap_account_dirty(page->mapping)) {
dec_zone_page_state(page, NR_FILE_DIRTY); dec_zone_page_state(page, NR_FILE_DIRTY);
task_io_account_cancelled_write(account_size); task_io_account_cancelled_write(account_size);
} }