linux-kernel - Re: [PATCH] md: Partially revert 2f6db2a7, which broke raid5

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Message-ID: <20130530092243.52fa17c3@notabene.brown>
Date:	Thu, 30 May 2013 09:22:43 +1000
From:	NeilBrown <neilb@...e.de>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	"Richard W.M. Jones" <rjones@...hat.com>,
	Kent Overstreet <koverstreet@...gle.com>,
	Calvin Owens <jcalvinowens@...il.com>,
	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
	majianpeng@...il.com
Subject: Re: [PATCH] md: Partially revert 2f6db2a7, which broke raid5

On Wed, 29 May 2013 15:03:40 +0200 Jens Axboe <axboe@...nel.dk> wrote:

> On Wed, May 29 2013, Richard W.M. Jones wrote:
> > 
> > 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 <koverstreet@...gle.com>
> > > 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 <koverstreet@...gle.com>
> > >     Cc: NeilBrown <neilb@...e.de>
> > >     Cc: Jens Axboe <axboe@...nel.dk>
> > >     Cc: linux-raid@...r.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.
> 
> I'm assuming both Kent and I are waiting for Neil to pick it up. Neil, I
> can include this in my next round going upstream, just let me know. It
> should have been sent upstream a while back, sorry guys.
> 

Seems you were waiting for me, and I was waiting for you :-)

Yes: please include it with your next round.  Thanks!

NeilBrown

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