On 13/04/16 14:22, Bob Liu wrote:
>
> On 04/07/2016 06:00 PM, Bob Liu wrote:
>> * What's data integrity extension and why?
>> Modern filesystems feature checksumming of data and metadata to protect
>> against
>> data corruption. However, the detection of the corruption is done at read
>> time
>
Bob Liu writes ("Re: [RFC PATCH] Data integrity extension support for
xen-block"):
> A simpler possible solution:
As a syntax this is certainly simpler and quite probably preferable.
But NB that I regard your email as simply a sketch of the syntax. We
also need (as discussed) a statement of the
On 04/07/2016 06:00 PM, Bob Liu wrote:
> * What's data integrity extension and why?
> Modern filesystems feature checksumming of data and metadata to protect
> against
> data corruption. However, the detection of the corruption is done at read
> time
> which could potentially be months after th
> * A filesystem in Guest that is integrity-aware can prepare I/Os with
> metadata attached.
> * Filesystems in Guest are capable of transferring metadata from user space.
> Those metadata get lost if we don't pass them through in blkfront.
>
> You may have a look at:
> [1] http://lwn.net/Article
On 04/08/2016 10:32 PM, David Vrabel wrote:
> On 08/04/16 15:20, Ian Jackson wrote:
>> David Vrabel writes ("Re: [RFC PATCH] Data integrity extension support for
>> xen-block"):
>>> You need to read the relevant SCSI specification and find out what
>>> interfaces and behaviour the hardware has so
On 08/04/16 15:20, Ian Jackson wrote:
> David Vrabel writes ("Re: [RFC PATCH] Data integrity extension support for
> xen-block"):
>> You need to read the relevant SCSI specification and find out what
>> interfaces and behaviour the hardware has so you can specify compatible
>> interfaces in blkif.
David Vrabel writes ("Re: [RFC PATCH] Data integrity extension support for
xen-block"):
> You need to read the relevant SCSI specification and find out what
> interfaces and behaviour the hardware has so you can specify compatible
> interfaces in blkif.
>
> My (brief) reading around this suggests
On 07/04/16 11:00, Bob Liu wrote:
> * What's data integrity extension and why?
> Modern filesystems feature checksumming of data and metadata to protect
> against
> data corruption. However, the detection of the corruption is done at read
> time
> which could potentially be months after the data
FYI I have things I want to say in this conversation but today I am
concentrating on committing for the 4.7 freeze.
Ian.
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On 04/08/2016 05:44 PM, Roger Pau Monné wrote:
> On Fri, 8 Apr 2016, Bob Liu wrote:
>>
>> On 04/07/2016 11:55 PM, Juergen Gross wrote:
>>> On 07/04/16 12:00, Bob Liu wrote:
* What's data integrity extension and why?
Modern filesystems feature checksumming of data and metadata to protect
On Fri, 8 Apr 2016, Bob Liu wrote:
>
> On 04/07/2016 11:55 PM, Juergen Gross wrote:
> > On 07/04/16 12:00, Bob Liu wrote:
> >> * What's data integrity extension and why?
> >> Modern filesystems feature checksumming of data and metadata to protect
> >> against
> >> data corruption. However, the d
On 08/04/16 03:24, Bob Liu wrote:
>
> On 04/07/2016 11:55 PM, Juergen Gross wrote:
>> On 07/04/16 12:00, Bob Liu wrote:
>>> * What's data integrity extension and why?
>>> Modern filesystems feature checksumming of data and metadata to protect
>>> against
>>> data corruption. However, the detecti
On 04/07/2016 11:55 PM, Juergen Gross wrote:
> On 07/04/16 12:00, Bob Liu wrote:
>> * What's data integrity extension and why?
>> Modern filesystems feature checksumming of data and metadata to protect
>> against
>> data corruption. However, the detection of the corruption is done at read
>> ti
On 07/04/16 12:00, Bob Liu wrote:
> * What's data integrity extension and why?
> Modern filesystems feature checksumming of data and metadata to protect
> against
> data corruption. However, the detection of the corruption is done at read
> time
> which could potentially be months after the data
Bob Liu writes ("[RFC PATCH] Data integrity extension support for xen-block"):
> +/*
> + * Extra request, must follow a normal-request and a normal-request can
> + * only be followed by one extra request.
> + */
I don't myself have (yet) an opinion about the syntax of this. I'd
like to hear from
* What's data integrity extension and why?
Modern filesystems feature checksumming of data and metadata to protect against
data corruption. However, the detection of the corruption is done at read time
which could potentially be months after the data was written. At that point the
original data t
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