linux-kernel - Re: [PATCH 006 of 6] md: Add support for reshape of a raid6

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Date:	Thu, 22 Feb 2007 00:36:22 +0100
From:	Oleg Verych <olecom@...wer.upol.cz>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	NeilBrown <neilb@...e.de>
Cc:	linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 006 of 6] md: Add support for reshape of a raid6

> From: Andrew Morton
> Newsgroups: gmane.linux.raid,gmane.linux.kernel
> Subject: Re: [PATCH 006 of 6] md: Add support for reshape of a raid6
> Date: Wed, 21 Feb 2007 14:48:06 -0800

Hallo.

> On Tue, 20 Feb 2007 17:35:16 +1100
> NeilBrown <neilb@...e.de> wrote:
>
>> +		for (i = conf->raid_disks ; i-- ;  ) {
>
> That statement should be dragged out, shot, stomped on then ceremonially
> incinerated.
>
> What's wrong with doing
>
> 	for (i = 0; i < conf->raid_disks; i++) {
>
> in a manner which can be understood without alcoholic fortification?
>
> ho hum.

In case someone likes to do job, GCC usually ought to do, i would
suggest something like this instead:

       if (expanded && test_bit(STRIPE_EXPANDING, &sh->state)) {
               /* Need to write out all blocks after computing P&Q */
-               sh->disks = conf->raid_disks;
+	       	i = conf->raid_disks;
+		sh->disks = i;
-               sh->pd_idx = stripe_to_pdidx(sh->sector, conf,
-                                            conf->raid_disks);
+               sh->pd_idx = stripe_to_pdidx(sh->sector, conf, i);

               compute_parity6(sh, RECONSTRUCT_WRITE);
-               for (i = conf->raid_disks ; i-- ;  ) {
+		do {
                       set_bit(R5_LOCKED, &sh->dev[i].flags);
                       locked++;
                       set_bit(R5_Wantwrite, &sh->dev[i].flags);
-               }
+		} while (--i);

               clear_bit(STRIPE_EXPANDING, &sh->state);
       } else if (expanded) {

In any case this is subject of scripts/bloat-o-meter.
____
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