[pso] [tema3 windows]test

[Florin Antonescu]

FILE_DEVICE_DISK implica folosirea DIRECT IO deci bufferul il vei primi in irp->MdlAddress si il accesezi cu MmGetSystemAddressForMdlSafe(irp->MdlAddress, NormalPagePriority)

 
Alexandru Florian Antonescu 344C2




----- Original Message ----
From: Mihai Borobocea <mihaiborobocea at gmail.com>
To: Proiectarea Sistemelor de Operare <pso at cursuri.cs.pub.ro>
Sent: Monday, June 9, 2008 6:08:07 PM
Subject: Re: [pso] [tema3 windows]test

La tema3 pe Windows, daca folosesc FILE_DEVICE_DISK in loc de
FILE_DEVICE_UNKNOWN, atunci la operatiile de read si write primesc
buffer-ul NULL.

Buffer-ul il obtin asa (la fel ca la tema cu portul serial):
pIrpStack = IoGetCurrentIrpStackLocation(irp);
destBuf = irp->AssociatedIrp.SystemBuffer;

S-a mai confruntat cineva cu problema asta?

Mersi,
Mihai

2008/5/17 Cristian Gratie <cgratie at yahoo.com>:
> Dupa multe ore in care m-am confruntat cu aceeasi problema, am gasit solutia: in IoCreateDevice trebuie specificat tipul FILE_DEVICE_DISK, in loc de FILE_DEVICE_UNKNOWN.
>
> Explicatia ar fi (presupun) ca daca nu se stie despre ce tip de dispozitiv e vorba, nu se va actualiza file pointer-ul asociat.
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