From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Richard W.M. Jones" Subject: Re: [PATCH] md: Partially revert 2f6db2a7, which broke raid5 Date: Wed, 29 May 2013 13:43:57 +0100 Message-ID: <20130529124357.GA15210@redhat.com> References: <20130517213223.GA2530@gmail.com> <20130518070515.GL19781@kernel.dk> <20130519175145.GC19194@moria.home.lan> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20130519175145.GC19194@moria.home.lan> Sender: linux-kernel-owner@vger.kernel.org To: Kent Overstreet Cc: Jens Axboe , Calvin Owens , linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, NeilBrown , majianpeng@gmail.com List-Id: linux-raid.ids On Sun, May 19, 2013 at 10:51:45AM -0700, Kent Overstreet wrote: > Sorry for the delay - been vacationing. Reproduced the original bug, > here's a patch that fixes it: > > > commit 402f5db3708b2062795a384a3d8397cf702e27bc > Author: Kent Overstreet > Date: Sun May 19 10:27:07 2013 -0700 > > raid5: Initialize bi_vcnt > > The patch that converted raid5 to use bio_reset() forgot to initialize > bi_vcnt. > > Signed-off-by: Kent Overstreet > Cc: NeilBrown > Cc: Jens Axboe > Cc: linux-raid@vger.kernel.org > > diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c > index 9359828..753f318 100644 > --- a/drivers/md/raid5.c > +++ b/drivers/md/raid5.c > @@ -664,6 +664,7 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s) > if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) > bi->bi_rw |= REQ_FLUSH; > > + bi->bi_vcnt = 1; > bi->bi_io_vec[0].bv_len = STRIPE_SIZE; > bi->bi_io_vec[0].bv_offset = 0; > bi->bi_size = STRIPE_SIZE; > @@ -701,6 +702,7 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s) > else > rbi->bi_sector = (sh->sector > + rrdev->data_offset); > + rbi->bi_vcnt = 1; > rbi->bi_io_vec[0].bv_len = STRIPE_SIZE; > rbi->bi_io_vec[0].bv_offset = 0; > rbi->bi_size = STRIPE_SIZE; Ditto to the previous follow up. We've been tracking this bug for nearly a month: https://bugzilla.redhat.com/show_bug.cgi?id=962079 Please include this (or the other) patch to fix it. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones virt-top is 'top' for virtual machines. Tiny program with many powerful monitoring features, net stats, disk stats, logging, etc. http://people.redhat.com/~rjones/virt-top