On Tue, May 12, 2015 at 11:09 AM, Wido den Hollander <wido@xxxxxxxx> wrote:
> On 05/12/2015 09:48 AM, Edgaras Lukoševičius wrote:
>> Resending commands I’m using to everyone.
>>
>> # rbd-fuse -p pool -r image /mnt/trim/
>> # losetup /dev/loop0 /mnt/trim/image
>> # kpartx -av /dev/loop0
>> # mount /dev/mapper/loop0p1 /mnt/fstrim/
>> # fstrim -v /mnt/fstrim/
>> /mnt/fstrim/: 1.1 TiB (1167710830592 bytes) trimmed
>>
>> I don’t use qemu, kvm.
>>
>
> I think that kernel 3.10 doesn't support TRIM yet. Afaik it was
> implemented in kernel 3.18 of 3.19
>
> Wido
>
>> Anyone can help with this?
This is rbd-fuse, not kernel client. I wanted to take a look, but
haven't had a chance yet. rbd-fuse probably just doesn't support
trimming. AFAIR discard requests to a loop device are translated into
hole punches on the underlying file, and rbd-fuse doesn't seem to
provide ->fallocate() callback. It wouldn't be hard to add though,
I can take a shot at it later.
Thanks,
Ilya
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