On 4/22/11 11:08 AM, Keith Mannthey wrote:
> On Fri, 2011-04-22 at 09:44 +0200, Lukas Czerner wrote:
...
>> Actually you can query that with hdparm -I /path/to/the/device and you
>> should see something like
>>
>> * Data Set Management TRIM supported
>>
>> in the output.
>
> I see
>
> * Data Set Management TRIM supported
> ...
> * Deterministic read after TRIM
>
> set on my devices.
>
> Thanks,
> Keith
So the way you get your message is:
ret = ext4_issue_discard(sb, entry->group,
entry->start_blk, entry->count);
if (unlikely(ret == -EOPNOTSUPP)) {
ext4_warning(sb, "discard not supported, "
"disabling");
clear_opt(sb, DISCARD);
}
which returns the error message from the calls below it:
ext4_issue_discard
sb_issue_discard
blkdev_issue_discard
and EOPNOTSUPP is pretty clear... I wonder if it could be that a discard request
on a particular boundary is causing it to be rejected?
-Eric
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