From db5ebd6edd2627d7e81a031643cf43587f63e66c Mon Sep 17 00:00:00 2001 From: Ming Lei Date: Sun, 17 Mar 2019 18:01:04 +0800 Subject: block: avoid to break XEN by multi-page bvec XEN has special page merge requirement, see xen_biovec_phys_mergeable(). We can't merge pages into one bvec simply for XEN. So move XEN's specific check on page merge into __bio_try_merge_page(), then abvoid to break XEN by multi-page bvec. Cc: ris Ostrovsky Cc: xen-devel@lists.xenproject.org Cc: Omar Sandoval Cc: Christoph Hellwig Reviewed-by: Juergen Gross Signed-off-by: Ming Lei Signed-off-by: Jens Axboe --- block/bio.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'block/bio.c') diff --git a/block/bio.c b/block/bio.c index b64cedc7f87c..b2423e7aae08 100644 --- a/block/bio.c +++ b/block/bio.c @@ -776,6 +776,8 @@ bool __bio_try_merge_page(struct bio *bio, struct page *page, if (vec_end_addr + 1 != page_addr + off) return false; + if (xen_domain() && !xen_biovec_phys_mergeable(bv, page)) + return false; if (same_page && (vec_end_addr & PAGE_MASK) != page_addr) return false; -- cgit v1.2.3