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/* $OpenBSD: diskmap.c,v 1.2 2010/06/14 16:51:55 thib Exp $ */
/*
* Copyright (c) 2009, 2010 Joel Sing <jsing@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Disk mapper.
*/
#include <sys/param.h>
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/errno.h>
#include <sys/buf.h>
#include <sys/conf.h>
#include <sys/dkio.h>
#include <sys/disk.h>
#include <sys/disklabel.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/malloc.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/vnode.h>
int
diskmapopen(dev_t dev, int flag, int fmt, struct proc *p)
{
return 0;
}
int
diskmapclose(dev_t dev, int flag, int fmt, struct proc *p)
{
return 0;
}
int
diskmapioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p)
{
struct dk_diskmap *dm;
struct nameidata ndp;
struct filedesc *fdp;
struct file *fp;
struct vnode *vp = NULL, *ovp;
char *devname;
int fd, error = EINVAL;
if (cmd != DIOCMAP)
return EINVAL;
/*
* Map a request for a disk to the correct device. We should be
* supplied with either a diskname or a disklabel UID.
*/
dm = (struct dk_diskmap *)addr;
fd = dm->fd;
devname = malloc(PATH_MAX, M_DEVBUF, M_WAITOK);
if (copyinstr(dm->device, devname, PATH_MAX, NULL))
goto invalid;
if (disk_map(devname, devname, PATH_MAX, dm->flags) == 0)
if (copyoutstr(devname, dm->device, PATH_MAX, NULL))
goto invalid;
/* Attempt to open actual device. */
fdp = p->p_fd;
fdplock(fdp);
if ((u_int)fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL) {
error = EINVAL;
goto bad;
}
if (FILE_IS_USABLE(fp) == NULL) {
error = EINVAL;
goto bad;
}
NDINIT(&ndp, LOOKUP, NOFOLLOW | LOCKLEAF | SAVENAME, UIO_SYSSPACE,
devname, p);
if ((error = vn_open(&ndp, fp->f_flag, 0)) != 0)
goto bad;
vp = ndp.ni_vp;
/* Close the original vnode. */
ovp = (struct vnode *)fp->f_data;
if (fp->f_flag & FWRITE)
ovp->v_writecount--;
if (ovp->v_writecount == 0) {
vn_lock(ovp, LK_EXCLUSIVE | LK_RETRY, p);
VOP_CLOSE(ovp, fp->f_flag, p->p_ucred, p);
vput(ovp);
}
fp->f_type = DTYPE_VNODE;
fp->f_ops = &vnops;
fp->f_data = (caddr_t)vp;
fp->f_offset = 0;
fp->f_rxfer = 0;
fp->f_wxfer = 0;
fp->f_seek = 0;
fp->f_rbytes = 0;
fp->f_wbytes = 0;
VOP_UNLOCK(vp, 0, p);
free(devname, M_DEVBUF);
fdpunlock(fdp);
return 0;
bad:
if (vp)
vput(vp);
fdpunlock(fdp);
invalid:
free(devname, M_DEVBUF);
return (error);
}
int
diskmapread(dev_t dev, struct uio *uio, int flag)
{
return ENXIO;
}
int
diskmapwrite(dev_t dev, struct uio *uio, int flag)
{
return ENXIO;
}
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