[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [PATCH v2 3/3] scsi-disk: Add support for the GET LBA STATUS 16 comm
|
From: |
Paolo Bonzini |
|
Subject: |
Re: [PATCH v2 3/3] scsi-disk: Add support for the GET LBA STATUS 16 command |
|
Date: |
Tue, 30 Jun 2020 17:40:49 +0200 |
|
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 |
On 29/06/20 18:02, Eric Blake wrote:
> - allocation implies that data comes from this layer of a backing chain,
> rather than deferring to a backing image
>
> - allocation implies that storage is reserved (that is, not sparse)
>
> It sounds like we are trying to represent the second question for scsi
> (namely, the same question that gets answered by lseek(SEEK_HOLE) for
> POSIX files), and not the first (namely, the question answered for qcow2
> images).
>
Yes, SCSI does not know about layers.
Paolo