[vbox-dev] No more supports DrvStorageFilter Sample ?

Klaus Espenlaub klaus.espenlaub at oracle.com
Mon Sep 1 17:30:03 UTC 2014


Hi Woof,

the DrvStorageFilter sample apparently became somewhat broken due to the 
introduction of new optional functionality. Minor bit rot, will be fixed 
in the next 4.3 release. If you're impatient, 
https://www.virtualbox.org/changeset/52547/vbox shows what changes are 
needed to get it working.

On 29.08.2014 10:21, Woof wrote:
> Sorry about separated Questions.
>
> How can i figure out pfnTranserCompleteNotify callback from read or
> write? and its buffers information.
>
> i wanna write encryption/decryption filter for HDD Image. am i right way??

Not really... for such functionality we introduced filter support at the 
VD layer level (which has the necessary means to implement this, a 
generic storage filter driver has far less possibilities) - and the fact 
that we're introducing such support should be a clear enough hint that 
we're working on such functionality already.

BTW, if you have trouble with 4.3.14, try the latest test build in 
https://www.virtualbox.org/ticket/13187 and let us know if it addresses 
your problems (or what's the exact error you're getting).

Klaus
>
> Thanks..
>
>
>
>
> 2014-08-29 14:44 GMT+09:00 Woof <he1.woof at gmail.com
> <mailto:he1.woof at gmail.com>>:
>
>     Hm..
>
>     I fixed crash, it was in below interface.
>
>     these code could not get pfnDiscard and pfnStartDiscard members.
>     pThis->pIMediaBelow      = PDMIBASE_QUERY_INTERFACE(pIBaseBelow,
>     PDMIMEDIA);
>     pThis->pIMediaAsyncBelow = PDMIBASE_QUERY_INTERFACE(pIBaseBelow,
>     PDMIMEDIAASYNC);
>
>     Actually, below is DrvVD. it has allocated drvvdDiskcard(),
>     drvvdStartDiscard(). but members are NULL.
>
>     so.. I tried to assign these functions using debugger, it does not
>     make crash but does not work.
>
>     finally, i modified when it call below driver interface member, if
>     the interface member is null, just return success(0). it seems like
>     no problem.
>
>     *If this sample is still valid, should be fixed these point.*
>     ** it needs pfnGetSectorsize member in iMedia*
>     ** Checks below interface functions pointer*
>
>     thanks~
>
>
>     ps.. I do not know when that members are ignored.. ;(
>
>
>
>
>
>
>
>     2014-08-29 11:33 GMT+09:00 Woof <he1.woof at gmail.com
>     <mailto:he1.woof at gmail.com>>:
>
>
>         I treid DrvStoregeFilter sample, but it makes crash. because
>         PDMIMEDIA does not have pfnGetSectorSize member.
>
>         so add that function but still occur access violation on running
>         time. ;(
>
>         I wanna to know this sample is not supported now?
>
>         working on 4.3.12 (4.3.14 makes crash with A/Vs..)
>
>         I hope just not updated problem.. :|
>
>         Thanks. :D
>



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