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: Arne Redlich <arne.redlich@googlemail.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com> Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
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@ -205,7 +205,7 @@ void drbd_bm_unlock(struct drbd_conf *mdev)
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static void bm_store_page_idx(struct page *page, unsigned long idx)
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{
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BUG_ON(0 != (idx & ~BM_PAGE_IDX_MASK));
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page_private(page) |= idx;
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set_page_private(page, idx);
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}
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static unsigned long bm_page_to_idx(struct page *page)
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