linux-kernel - Re: Boot failure with ext2 and initrds

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Message-ID: <Pine.LNX.4.64.0611202031370.5912@blonde.wat.veritas.com>
Date:	Mon, 20 Nov 2006 20:54:14 +0000 (GMT)
From:	Hugh Dickins <hugh@...itas.com>
To:	Andrew Morton <akpm@...l.org>
cc:	cmm@...ibm.com, Mel Gorman <mel@...net.ie>,
	"Martin J. Bligh" <mbligh@...igh.org>,
	linux-kernel@...r.kernel.org,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: Boot failure with ext2 and initrds

On Mon, 20 Nov 2006, Hugh Dickins wrote:
> 
> I'll do a little staring at the code myself: I'm unlikely to notice
> anything you've missed, but there's just a chance staring at it will
> direct me to some detail I've jotted down from before.

Not found anything relevant, but I keep noticing these lines
in ext2_try_to_allocate_with_rsv(), ext3 and ext4 similar:

		} else if (grp_goal > 0 &&
				(my_rsv->rsv_end - grp_goal + 1) < *count)
			try_to_extend_reservation(my_rsv, sb,
					*count-my_rsv->rsv_end + grp_goal - 1);

They're wrong, a no-op in most groups, aren't they?  rsv_end is an
absolute block number, whereas grp_goal is group-relative, so the
calculation ought to bring in group_first_block?  Or I'm confused.

(Whereas in my hang the grp_goal to ext2_try_to_allocate was -1
when I looked, with group 0 and num 1.)

Hugh
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