linux-kernel - Re: [PATCH] md: dm-verity: Fix to avoid a deadlock in dm-bufio

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Date:	Mon, 4 Mar 2013 13:23:54 -0800
From:	Paul Taysom <taysom@...gle.com>
To:	Paul Taysom <taysom@...omium.org>, agk@...hat.com,
	dm-devel@...hat.com, neilb@...e.de, linux-raid@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Mandeep Singh Baines <msb@...omium.org>,
	Mikulas Patocka <mpatocka@...hat.com>,
	Olof Johansson <olofj@...omium.org>
Subject: Re: [PATCH] md: dm-verity: Fix to avoid a deadlock in dm-bufio

On Mon, Mar 4, 2013 at 9:42 AM, Alasdair G Kergon <agk@...hat.com> wrote:
> On Mon, Mar 04, 2013 at 08:45:48AM -0800, Paul Taysom wrote:
>> @@ -449,8 +468,14 @@ static void verity_prefetch_io(struct dm_verity *v, struct dm_verity_io *io)
>>                               hash_block_end = v->hash_blocks - 1;
>>               }
>>  no_prefetch_cluster:
>> -             dm_bufio_prefetch(v->bufio, hash_block_start,
>> -                               hash_block_end - hash_block_start + 1);
>> +             vw = kmalloc(sizeof(*vw), GFP_KERNEL);
>
> kmalloc?  mempool? ...
>
> Alasdair
>
The use of mempool would be a separate patch that would have to be
measured for performance impact.
-Paul
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