linux-kernel - Re: [PATCH] dm-crypt: never use write same (was Re: [v3.7 Regression] [SCSI] sd: Implement support for WRITE SAME)

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Date:	Mon, 13 Jul 2015 12:33:07 -0400
From:	Joseph Salisbury <joseph.salisbury@...onical.com>
To:	Milan Broz <mbroz@...hat.com>
CC:	Mike Snitzer <snitzer@...hat.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	linux-kernel@...r.kernel.org, JBottomley@...allels.com,
	Kernel Team <kernel-team@...ts.ubuntu.com>, jgarzik@...hat.com
Subject: Re: [PATCH] dm-crypt: never use write same (was Re: [v3.7 Regression]
 [SCSI] sd: Implement support for WRITE SAME)

On 12/19/2012 05:20 PM, Joseph Salisbury wrote:
> On 12/19/2012 04:07 PM, Milan Broz wrote:
>> Does this help?
>>
>> dm-crypt: never use write same
>>
>> Ciphertext device is not compatible with WRITE SAME,
>> disable it for all dmcrypt devices.
>>
>> Signed-off-by: Milan Broz <mbroz@...hat.com>
>>
>> --- a/drivers/md/dm-crypt.c
>> +++ b/drivers/md/dm-crypt.c
>> @@ -1844,6 +1844,12 @@ static int crypt_iterate_devices(struct
>> dm_target *ti,
>>       return fn(ti, cc->dev, cc->start, ti->len, data);
>>   }
>>   +static void crypt_io_hints(struct dm_target *ti,
>> +                struct queue_limits *limits)
>> +{
>> +    limits->max_write_same_sectors = 0;
>> +}
>> +
>>   static struct target_type crypt_target = {
>>       .name   = "crypt",
>>       .version = {1, 11, 0},
>> @@ -1858,6 +1864,7 @@ static struct target_type crypt_target = {
>>       .message = crypt_message,
>>       .merge  = crypt_merge,
>>       .iterate_devices = crypt_iterate_devices,
>> +    .io_hints = crypt_io_hints,
>>   };
>>     static int __init dm_crypt_init(void)
>>
> Great work, Milan.  Your patch fixes the bug, stops the panic and
> allows dm-crypt to function properly.
>
> Will you be requesting this in v3.8 ?
>
> Thanks again,
>
> Joe
>
Hi Milan,

The Ubuntu kernel has been carrying this patch since the discussion[0]
we were having about the bug.  I don't see that patch was ever included
in mainline.  Do you happen to know if this patch is still needed or was
the bug we were seeing fixed in some other way?

Thanks,

Joe 


[0] https://lists.ubuntu.com/archives/kernel-team/2012-December/023524.html
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