Copyright (c) 2008 David Gwynne <dlg@openbsd.org>
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.Dd $Mdocdate$ .Dt VSCSI 4 .Os .Sh NAME .Nm vscsi .Nd Virtual SCSI controller .Sh SYNOPSIS .Cd "vscsi0 at root" .Cd "scsibus* at vscsi?"
p .Fd #include <sys/types.h> .Fd #include <sys/ioctl.h> .Fd #include <sys/scsi/scsi_all.h> .Fd #include <sys/dev/vscsivar.h> .Sh DESCRIPTION The .Nm device takes commands from the kernel SCSI midlayer and makes them available to userland for handling. Using this interface it is possible to implement virtual SCSI devices that are usable by the kernel. .Sh IOCTLS The following .Xr ioctl 2 commands are provided to allow userland to dequeue SCSI commands and reply to them: l -tag -width Ds t VSCSI_I2T (struct vscsi_ioc_i2t *) Dequeue a SCSI command. d -literal struct vscsi_ioc_i2t { int tag; u_int target; u_int lun; struct scsi_generic cmd; size_t cmdlen; size_t datalen; int direction; #define VSCSI_DIR_NONE 0 #define VSCSI_DIR_READ 1 #define VSCSI_DIR_WRITE 2 }; .Ed t VSCSI_DATA_READ (struct vscsi_ioc_data *) t VSCSI_DATA_WRITE (struct vscsi_ioc_data *) Read or write data in response to a SCSI command identified by tag. d -literal struct vscsi_ioc_data { int tag; void * data; size_t datalen; }; .Ed t VSCSI_T2I (struct vscsi_ioc_t2i *) Signal completion of a SCSI command identified by tag. d -literal struct vscsi_ioc_t2i { int tag; int status; #define VSCSI_STAT_DONE 0 #define VSCSI_STAT_SENSE 1 #define VSCSI_STAT_ERR 2 struct scsi_sense_data sense; size_t senselen; }; .Ed .Sh FILES l -tag -width /dev/vscsi0 t Pa /dev/vscsi0 .El .Sh SEE ALSO .Xr ioctl 2 , .Xr intro 4 , .Xr scsi 4 , .Xr MAKEDEV 8 .Sh HISTORY The .Nm driver first appeared in .Ox 4.5 . .Sh AUTHORS .An David Gwynne Aq dlg@openbsd.org .