I am writing a filter driver where I have implemented all possible IRPs like IRP_MJ_CREATE IRP_MJ_READ etc. I started implementing fast io routines also in this driver. I am required to fetch the details of disk offset where the writes are targeted to. With irps, I could get the details from irp parameter in the routines. But when implementing fastio , I am stuck at finding the disk offset. Any reads or pointers in this directions would be helpful.
Sorry, I’m confused…
Are you writing a file system filter, a disk filter, or a volume filter? The file system uses Fast I/O for reads/writes and the file offset is a parameter. There’s no concept of fast I/O read/write at the disk or volume levels.
Right! I am writing a volume filter driver and was thinking fast I/O concepts come in volume level too. Now its clear to me. Thanks for the lead.
1 Like