#include <vrp.h>
typedef struct _VRP {
ULONG VRP_demand_flags; // demand flags; see below
ULONG VRP_event_flags; // event flags; see below
USHORT VRP_max_sgd; // max # of scatter/gather descriptors
USHORT VRP_max_req_size; // max size of request packet
ULONG VRP_delta_to_ior; // delta from IOP to IOR
ULONG VRP_block_size; // block size of volume
ULONG VRP_fsd_hvol; // FSD's volume handle
ULONG VRP_fsd_entry; // file system request routine
ULONG VRP_device_handle; // address of handle for device
ULONG VRP_partition_offset; // partition bias for logical volumes
ULONG VRP_next_vrp; // link to next VRP
ULONG VRP_logical_handle; // pointer to logical device handle
ULONG VRP_reserved; // reserved; must be zero
} VRP, *PVRP;
VRP_dmd_small_memory | Data buffers must reside in the lower 16 Mb of memory. |
VRP_dmd_word_align | Data buffers must be word aligned. |
VRP_dmd_dword_align | Data buffers must be double word aligned. |
VRP_dmd_phys_sgd | Scatter/gather descriptors must contain physical addresses. If this value is not given, descriptors contain linear addresses. |
VRP_dmd_phys_sgd_ptr | Address to the first scatter/gather descriptor (IOR_sgd_lin_phys) must be a physical address. If this value is not given, the first address must be a linear address. |
VRP_dmd_do_a_b_toggling | Enable toggling between floppy drives A and B. When this value is set for a single floppy drive system, the volume tracker the toggles between the A and B drives when accessed. |
VRP_dmd_removable_supp | Device is removable. |
VRP_dmd_lock_unlock_media | Media supports software locking. |
VRP_dmd_load_eject_media | Media supports electronic eject. |
VRP_dmd_clear_media_chg | Media supports command to clear media change. |
VRP_dmd_no_xcl_required | Media allows absolute read/writes without an exclusive lock. |
VRP_dmd_pageability | Indicates that access to this volume can cause paging. |
VRP_ef_media_changed | The media containing this volume indicated change since most recent I/O operation. |
VRP_ef_media_uncertain | The media containing this volume may have been changed since the most recent I/O operation. |
VRP_ef_prompting | The media containing this volume is currently being prompted for. |
VRP_ef_input_share | The input stream of a character device is sharable. |
VRP_ef_output_share | The output stream of a character device is sharable. |
VRP_ef_user_canceled | The user has hit CANCEL on a request for reinserting this volume. |
VRP_ef_write_protected | This volume is currently write protected. |
VRP_ef_real_mode_mapped | This volume is currently accessed through the real mode mapper. |
VRP_ef_ios_locked | Device containing given volume is locked. |
IOP, IOR, IRS