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Commit f66ee697 authored by Lars Ellenberg's avatar Lars Ellenberg Committed by Philipp Reisner
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drbd: bm_page_async_io: properly initialize page->private 



If bm_page_async_io is advised to use a new page for I/O
(BM_AIO_COPY_PAGES is set), it will get it from a mempool.
Once the mempool has to dip into its reserves the page is
not reinitialized, i.e. page->private contains garbage, which
will lead to various problems once the I/O completes (dereferences
of NULL pointers, the submitting thread getting stuck in D-state,
 ...).

Signed-off-by: default avatarArne Redlich <arne.redlich@googlemail.com>
Signed-off-by: default avatarLars Ellenberg <lars.ellenberg@linbit.com>
parent a220d291

drivers/block/drbd/drbd_bitmap.c

+1 −1
Original line number Diff line number Diff line
@@ -200,7 +200,7 @@ void drbd_bm_unlock(struct drbd_conf *mdev) 
static void bm_store_page_idx(struct page *page, unsigned long idx)

{

	BUG_ON(0 != (idx & ~BM_PAGE_IDX_MASK));

	page_private(page) |= idx;

	set_page_private(page, idx);

}



static unsigned long bm_page_to_idx(struct page *page)