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/* $OpenBSD: diskmap.c,v 1.27 2023/04/13 02:19:05 jsg 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/systm.h>
#include <sys/device.h>
#include <sys/errno.h>
#include <sys/conf.h>
#include <sys/dkio.h>
#include <sys/disk.h>
#include <sys/disklabel.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/pledge.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 = p->p_fd;
struct file *fp0 = NULL, *fp = NULL;
struct vnode *vp = NULL;
char *devname, flags;
int error, fd;
if (cmd != DIOCMAP)
return ENOTTY;
/*
* 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 ((error = copyinstr(dm->device, devname, PATH_MAX, NULL)) != 0)
goto invalid;
if (disk_map(devname, devname, PATH_MAX, dm->flags) == 0) {
error = copyoutstr(devname, dm->device, PATH_MAX, NULL);
if (error != 0)
goto invalid;
}
/* Attempt to open actual device. */
if ((error = getvnode(p, fd, &fp0)) != 0)
goto invalid;
NDINIT(&ndp, 0, 0, UIO_SYSSPACE, devname, p);
ndp.ni_pledge = PLEDGE_RPATH;
ndp.ni_unveil = UNVEIL_READ;
if ((error = vn_open(&ndp, fp0->f_flag, 0)) != 0)
goto invalid;
vp = ndp.ni_vp;
VOP_UNLOCK(vp);
fdplock(fdp);
/*
* Stop here if the 'struct file *' has been replaced,
* for example by another thread calling dup2(2), while
* this thread was sleeping in vn_open().
*
* Note that this would not happen for correct usages of
* "/dev/diskmap".
*/
if (fdp->fd_ofiles[fd] != fp0) {
error = EAGAIN;
goto bad;
}
fp = fnew(p);
if (fp == NULL) {
error = ENFILE;
goto bad;
}
/* Zap old file. */
mtx_enter(&fdp->fd_fplock);
KASSERT(fdp->fd_ofiles[fd] == fp0);
flags = fdp->fd_ofileflags[fd];
fdp->fd_ofiles[fd] = NULL;
fdp->fd_ofileflags[fd] = 0;
mtx_leave(&fdp->fd_fplock);
/* Insert new file. */
fp->f_flag = fp0->f_flag;
fp->f_type = DTYPE_VNODE;
fp->f_ops = &vnops;
fp->f_data = (caddr_t)vp;
fdinsert(fdp, fd, flags, fp);
fdpunlock(fdp);
closef(fp0, p);
free(devname, M_DEVBUF, PATH_MAX);
return 0;
bad:
fdpunlock(fdp);
(void)vn_close(vp, fp0->f_flag, p->p_ucred, p);
invalid:
if (fp0)
FRELE(fp0, p);
free(devname, M_DEVBUF, PATH_MAX);
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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