The generic storage class driver (classpnp.sys) exposes an I/O control (IOCTL) interface for issuing Persistent Reserve Out commands. The behavior of the storage device when a Persistent Reserve Out command is received is described in the SCSI Primary Commands - 2 (SPC-2) specification. The IOCTL interface requires the caller to have read/write access to the physical device for Persistent Reserve Out commands. User-mode applications, services, and kernel-mode drivers can use this IOCTL to control persistent reservations. If called from a driver, this IOCTL must be called from a thread running at IRQL < DISPATCH_LEVEL. This IOCTL is defined with FILE_READ_ACCESS and FILE_WRITE_ACCESS, requiring a device handle to have both read and write permissions to issue the Persistent Reserve Out command.
The buffer at Irp->AssociatedIrp.SystemBuffer contains a PERSISTENT_RESERVE_COMMAND structure. You must allocate the buffer from nonpaged pool and must align it correctly for the target device and adapter.
PR_OUT.ServiceAction can be one of the following:
Input Buffer Length
The length of a PERSISTENT_RESERVE_COMMAND structure.
Output Buffer Length
The Information field is set to zero.
The Status field is set to one of the following:
|Header||ntddstor.h (include Ntddstor.h)|