From: Paolo Bonzini <pbonzini@redhat.com>
To: Peter Lieven <pl@kamp.de>
Cc: kwolf@redhat.com, ronniesahlberg@gmail.com,
qemu-devel@nongnu.org, stefanha@redhat.com
Subject: Re: [Qemu-devel] [PATCHv2 07/11] iscsi: let bdrv_create conditionally zero out the device
Date: Tue, 02 Jul 2013 13:04:45 +0200 [thread overview]
Message-ID: <51D2B3CD.6040001@redhat.com> (raw)
In-Reply-To: <A6465ECC-173D-4A04-BB87-3833A44989F9@kamp.de>
Il 02/07/2013 12:56, Peter Lieven ha scritto:
>
> Am 02.07.2013 um 12:49 schrieb Paolo Bonzini <pbonzini@redhat.com>:
>
>> Il 02/07/2013 12:36, Peter Lieven ha scritto:
>>>>>> Perhaps we can have a new "discard_zeroes" field in bdrv_get_info, and
>>>>>> the unmap functionality can be moved up to qemu-img convert?
>>>>>
>>>>> Is there any other storage protocol out there that could benefit from it?
>>>>
>>>> Definitely LVM. Perhaps in the future gluster too, though right now it
>>>> only supports discard on files, not block devices.
>>>
>>> Is discards on LVM sth that is already implemented in qemu?
>>
>> Yes, it supports BLKDISCARD (see handle_aiocb_discard in
>> block/raw-posix.c). Of course there is no way to query the host
>> discard_zeroes setting yet.
>
> No way in qemu or no way at all?
No way in QEMU. Linux has the BLKDISCARDZEROES ioctl, it takes an int*
as the third argument and puts 0/1 in it.
Paolo
next prev parent reply other threads:[~2013-07-02 11:19 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-27 13:11 [Qemu-devel] [PATCHv2 00/11] iscsi/qemu-img/block-migration enhancements Peter Lieven
2013-06-27 13:11 ` [Qemu-devel] [PATCHv2 01/11] iscsi: add logical block provisioning information to iscsilun Peter Lieven
2013-07-01 13:35 ` Stefan Hajnoczi
2013-07-01 16:08 ` Peter Lieven
2013-07-10 9:19 ` Kevin Wolf
2013-06-27 13:11 ` [Qemu-devel] [PATCHv2 02/11] iscsi: read unmap info from block limits vpd page Peter Lieven
2013-07-03 3:43 ` ronnie sahlberg
2013-07-03 21:23 ` Peter Lieven
2013-07-04 12:37 ` Paolo Bonzini
2013-07-04 21:07 ` Peter Lieven
2013-07-05 6:28 ` Paolo Bonzini
2013-07-05 7:11 ` ronnie sahlberg
2013-07-06 22:15 ` Peter Lieven
2013-07-06 23:23 ` ronnie sahlberg
2013-07-10 9:23 ` Kevin Wolf
2013-07-10 9:25 ` Kevin Wolf
2013-06-27 13:11 ` [Qemu-devel] [PATCHv2 03/11] iscsi: add bdrv_co_is_allocated Peter Lieven
2013-07-01 13:46 ` Stefan Hajnoczi
2013-07-01 16:00 ` Peter Lieven
2013-07-10 9:41 ` Kevin Wolf
2013-07-10 13:49 ` Peter Lieven
2013-07-10 14:43 ` Kevin Wolf
2013-07-10 14:49 ` Peter Lieven
2013-07-10 14:54 ` Kevin Wolf
2013-06-27 13:11 ` [Qemu-devel] [PATCHv2 04/11] iscsi: add bdrv_co_write_zeroes Peter Lieven
2013-07-10 9:54 ` Kevin Wolf
2013-06-27 13:11 ` [Qemu-devel] [PATCHv2 05/11] block: add bdrv_write_zeroes() Peter Lieven
2013-07-10 9:56 ` Kevin Wolf
2013-06-27 13:11 ` [Qemu-devel] [PATCHv2 06/11] block/raw: add bdrv_co_write_zeroes Peter Lieven
2013-07-10 9:57 ` Kevin Wolf
2013-06-27 13:11 ` [Qemu-devel] [PATCHv2 07/11] iscsi: let bdrv_create conditionally zero out the device Peter Lieven
2013-07-01 13:58 ` Stefan Hajnoczi
2013-07-01 20:20 ` Paolo Bonzini
2013-07-01 21:36 ` Peter Lieven
2013-07-02 9:22 ` Paolo Bonzini
2013-07-02 10:36 ` Peter Lieven
2013-07-02 10:49 ` Paolo Bonzini
2013-07-02 10:56 ` Peter Lieven
2013-07-02 11:04 ` Paolo Bonzini [this message]
2013-07-02 11:18 ` Peter Lieven
2013-07-10 10:14 ` Kevin Wolf
2013-07-10 13:52 ` Peter Lieven
2013-06-27 13:11 ` [Qemu-devel] [PATCHv2 08/11] block-migration: efficiently encode zero blocks Peter Lieven
2013-07-01 14:13 ` Stefan Hajnoczi
2013-07-01 15:55 ` Peter Lieven
2013-07-02 7:40 ` Stefan Hajnoczi
2013-07-02 10:51 ` Paolo Bonzini
2013-07-01 16:09 ` Peter Lieven
2013-07-02 7:36 ` Stefan Hajnoczi
2013-06-27 13:11 ` [Qemu-devel] [PATCHv2 09/11] iscsi: factor out sector conversions Peter Lieven
2013-07-10 11:29 ` Kevin Wolf
2013-07-10 14:07 ` Peter Lieven
2013-06-27 13:11 ` [Qemu-devel] [PATCHv2 10/11] iscsi: ignore aio_discard if unsupported Peter Lieven
2013-07-10 11:33 ` Kevin Wolf
2013-07-10 14:04 ` Peter Lieven
2013-07-10 14:28 ` Kevin Wolf
2013-07-10 14:49 ` Peter Lieven
2013-07-10 14:58 ` Kevin Wolf
2013-07-10 20:31 ` Peter Lieven
2013-06-27 13:11 ` [Qemu-devel] [PATCHv2 11/11] iscsi: assert that sectors are aligned to LUN blocksize Peter Lieven
2013-07-01 14:35 ` Stefan Hajnoczi
2013-07-01 15:59 ` Peter Lieven
2013-07-02 7:44 ` Stefan Hajnoczi
2013-07-02 8:28 ` Peter Lieven
2013-07-02 10:44 ` Paolo Bonzini
2013-07-02 10:49 ` Peter Lieven
2013-07-02 10:53 ` Paolo Bonzini
2013-07-10 11:38 ` Kevin Wolf
2013-07-10 14:02 ` Peter Lieven
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