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fix unbalanced page refcounting in bio_map_user_iov
bio_map_user_iov and bio_unmap_user do unbalanced pages refcounting if IO vector has small consecutive buffers belonging to the same page. bio_add_pc_page merges them into one, but the page reference is never dropped. Cc: email@example.com Signed-off-by: Vitaly Mayatskikh <firstname.lastname@example.org> Signed-off-by: Al Viro <email@example.com>
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