linux-kernel - [PATCH next] bio: zero inlined bio

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Date:	Tue, 23 Dec 2008 01:08:27 +0000 (GMT)
From:	Hugh Dickins <hugh@...itas.com>
To:	Jens Axboe <jens.axboe@...cle.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-kernel@...r.kernel.org
Subject: [PATCH next] bio: zero inlined bio_vec

bvec_alloc_bs() zeroes its bio_vec, and at least __blk_queue_bounce()
relies upon that: therefore bio_alloc_bioset() must zero the inlined
bio_vec - without that, lots of nastiness occurs in bounce_end_io and
blk_rq_map_sg and other places when booting up my PAE box.

Signed-off-by: Hugh Dickins <hugh@...itas.com>
---

 fs/bio.c |    2 ++
 1 file changed, 2 insertions(+)

--- linux-next/fs/bio.c	2008-12-21 20:49:25.000000000 +0000
+++ fixed/fs/bio.c	2008-12-22 21:10:06.000000000 +0000
@@ -324,6 +324,8 @@ struct bio *bio_alloc_bioset(gfp_t gfp_m
 			if (nr_iovecs <= BIO_INLINE_VECS) {
 				idx = 0;
 				bvl = bio->bi_inline_vecs;
+				memset(bvl, 0, BIO_INLINE_VECS *
+							sizeof(struct bio_vec));
 				nr_iovecs = BIO_INLINE_VECS;
 			} else {
 				bvl = bvec_alloc_bs(gfp_mask, nr_iovecs, &idx,
--
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