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 <[email protected]>
>>
>> --- 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
On 07/13/2015 06:33 PM, Joseph Salisbury wrote:
> 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?
I think it was superseded by later Mike's approach to reverse the logic
- disable write same for all targets and require to explicitly allow it.
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/md/dm-table.c?id=c1a94672a830e01d58c7c7e8de530c3f136d6ff2
(+later patches)
So I think we do no need this patch upstream anymore.
Mike, am I right here?
Milan
(sorry, resending again, not sure if it was sent correctly)
On 07/13/2015 06:33 PM, Joseph Salisbury wrote:
> 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?
I think it was superseded by later Mike's approach to reverse the logic
- disable write same for all targets and require to explicitly allow it.
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/md/dm-table.c?id=c1a94672a830e01d58c7c7e8de530c3f136d6ff2
(+later patches)
So I think we do no need this patch upstream anymore.
Mike, am I right here?
Milan
On Mon, Jul 13 2015 at 1:01pm -0400,
Milan Broz <[email protected]> wrote:
> (sorry, resending again, not sure if it was sent correctly)
>
> On 07/13/2015 06:33 PM, Joseph Salisbury wrote:
> > 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?
>
> I think it was superseded by later Mike's approach to reverse the logic
> - disable write same for all targets and require to explicitly allow it.
>
> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/md/dm-table.c?id=c1a94672a830e01d58c7c7e8de530c3f136d6ff2
> (+later patches)
>
> So I think we do no need this patch upstream anymore.
>
> Mike, am I right here?
Yeah, a DM target needs to opt-in by setting ti->num_write_same_bios
(only linear, stripe and mpath do at this time).