745 lines
18 KiB
C
745 lines
18 KiB
C
/* $OpenBSD: spec_vnops.c,v 1.112 2024/02/03 18:51:58 beck Exp $ */
|
|
/* $NetBSD: spec_vnops.c,v 1.29 1996/04/22 01:42:38 christos Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1989, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)spec_vnops.c 8.8 (Berkeley) 11/21/94
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/fcntl.h>
|
|
#include <sys/disklabel.h>
|
|
#include <sys/lockf.h>
|
|
#include <sys/dkio.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/specdev.h>
|
|
#include <sys/unistd.h>
|
|
|
|
#define v_lastr v_specinfo->si_lastr
|
|
|
|
int spec_open_clone(struct vop_open_args *);
|
|
|
|
struct vnodechain speclisth[SPECHSZ];
|
|
|
|
const struct vops spec_vops = {
|
|
.vop_lookup = vop_generic_lookup,
|
|
.vop_create = vop_generic_badop,
|
|
.vop_mknod = vop_generic_badop,
|
|
.vop_open = spec_open,
|
|
.vop_close = spec_close,
|
|
.vop_access = spec_access,
|
|
.vop_getattr = spec_getattr,
|
|
.vop_setattr = spec_setattr,
|
|
.vop_read = spec_read,
|
|
.vop_write = spec_write,
|
|
.vop_ioctl = spec_ioctl,
|
|
.vop_kqfilter = spec_kqfilter,
|
|
.vop_revoke = vop_generic_revoke,
|
|
.vop_fsync = spec_fsync,
|
|
.vop_remove = vop_generic_badop,
|
|
.vop_link = vop_generic_badop,
|
|
.vop_rename = vop_generic_badop,
|
|
.vop_mkdir = vop_generic_badop,
|
|
.vop_rmdir = vop_generic_badop,
|
|
.vop_symlink = vop_generic_badop,
|
|
.vop_readdir = vop_generic_badop,
|
|
.vop_readlink = vop_generic_badop,
|
|
.vop_abortop = vop_generic_badop,
|
|
.vop_inactive = spec_inactive,
|
|
.vop_reclaim = nullop,
|
|
.vop_lock = nullop,
|
|
.vop_unlock = nullop,
|
|
.vop_islocked = nullop,
|
|
.vop_bmap = vop_generic_bmap,
|
|
.vop_strategy = spec_strategy,
|
|
.vop_print = spec_print,
|
|
.vop_pathconf = spec_pathconf,
|
|
.vop_advlock = spec_advlock,
|
|
.vop_bwrite = vop_generic_bwrite,
|
|
};
|
|
|
|
/*
|
|
* Open a special file.
|
|
*/
|
|
int
|
|
spec_open(void *v)
|
|
{
|
|
struct vop_open_args *ap = v;
|
|
struct proc *p = ap->a_p;
|
|
struct vnode *vp = ap->a_vp;
|
|
struct vnode *bvp;
|
|
dev_t bdev;
|
|
dev_t dev = (dev_t)vp->v_rdev;
|
|
int maj = major(dev);
|
|
int error;
|
|
|
|
/*
|
|
* Don't allow open if fs is mounted -nodev.
|
|
*/
|
|
if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_NODEV))
|
|
return (ENXIO);
|
|
|
|
switch (vp->v_type) {
|
|
|
|
case VCHR:
|
|
if ((u_int)maj >= nchrdev)
|
|
return (ENXIO);
|
|
if (ap->a_cred != FSCRED && (ap->a_mode & FWRITE)) {
|
|
/*
|
|
* When running in very secure mode, do not allow
|
|
* opens for writing of any disk character devices.
|
|
*/
|
|
if (securelevel >= 2 && cdevsw[maj].d_type == D_DISK)
|
|
return (EPERM);
|
|
/*
|
|
* When running in secure mode, do not allow opens
|
|
* for writing of /dev/mem, /dev/kmem, or character
|
|
* devices whose corresponding block devices are
|
|
* currently mounted.
|
|
*/
|
|
if (securelevel >= 1) {
|
|
if ((bdev = chrtoblk(dev)) != NODEV &&
|
|
vfinddev(bdev, VBLK, &bvp) &&
|
|
bvp->v_usecount > 0 &&
|
|
(error = vfs_mountedon(bvp)))
|
|
return (error);
|
|
if (iskmemdev(dev))
|
|
return (EPERM);
|
|
}
|
|
}
|
|
if (cdevsw[maj].d_type == D_TTY)
|
|
vp->v_flag |= VISTTY;
|
|
if (cdevsw[maj].d_flags & D_CLONE)
|
|
return (spec_open_clone(ap));
|
|
VOP_UNLOCK(vp);
|
|
error = (*cdevsw[maj].d_open)(dev, ap->a_mode, S_IFCHR, p);
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
return (error);
|
|
|
|
case VBLK:
|
|
if ((u_int)maj >= nblkdev)
|
|
return (ENXIO);
|
|
/*
|
|
* When running in very secure mode, do not allow
|
|
* opens for writing of any disk block devices.
|
|
*/
|
|
if (securelevel >= 2 && ap->a_cred != FSCRED &&
|
|
(ap->a_mode & FWRITE) && bdevsw[maj].d_type == D_DISK)
|
|
return (EPERM);
|
|
/*
|
|
* Do not allow opens of block devices that are
|
|
* currently mounted.
|
|
*/
|
|
if ((error = vfs_mountedon(vp)) != 0)
|
|
return (error);
|
|
return ((*bdevsw[maj].d_open)(dev, ap->a_mode, S_IFBLK, p));
|
|
case VNON:
|
|
case VLNK:
|
|
case VDIR:
|
|
case VREG:
|
|
case VBAD:
|
|
case VFIFO:
|
|
case VSOCK:
|
|
break;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Vnode op for read
|
|
*/
|
|
int
|
|
spec_read(void *v)
|
|
{
|
|
struct vop_read_args *ap = v;
|
|
struct vnode *vp = ap->a_vp;
|
|
struct uio *uio = ap->a_uio;
|
|
struct proc *p = uio->uio_procp;
|
|
struct buf *bp;
|
|
daddr_t bn, nextbn, bscale;
|
|
int bsize;
|
|
struct partinfo dpart;
|
|
size_t n;
|
|
int on, majordev;
|
|
int (*ioctl)(dev_t, u_long, caddr_t, int, struct proc *);
|
|
int error = 0;
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (uio->uio_rw != UIO_READ)
|
|
panic("spec_read mode");
|
|
if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc)
|
|
panic("spec_read proc");
|
|
#endif
|
|
if (uio->uio_resid == 0)
|
|
return (0);
|
|
|
|
switch (vp->v_type) {
|
|
|
|
case VCHR:
|
|
VOP_UNLOCK(vp);
|
|
error = (*cdevsw[major(vp->v_rdev)].d_read)
|
|
(vp->v_rdev, uio, ap->a_ioflag);
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
return (error);
|
|
|
|
case VBLK:
|
|
if (uio->uio_offset < 0)
|
|
return (EINVAL);
|
|
bsize = BLKDEV_IOSIZE;
|
|
if ((majordev = major(vp->v_rdev)) < nblkdev &&
|
|
(ioctl = bdevsw[majordev].d_ioctl) != NULL &&
|
|
(*ioctl)(vp->v_rdev, DIOCGPART, (caddr_t)&dpart, FREAD, p) == 0) {
|
|
u_int32_t frag =
|
|
DISKLABELV1_FFS_FRAG(dpart.part->p_fragblock);
|
|
u_int32_t fsize =
|
|
DISKLABELV1_FFS_FSIZE(dpart.part->p_fragblock);
|
|
if (dpart.part->p_fstype == FS_BSDFFS && frag != 0 &&
|
|
fsize != 0)
|
|
bsize = frag * fsize;
|
|
}
|
|
bscale = btodb(bsize);
|
|
do {
|
|
bn = btodb(uio->uio_offset) & ~(bscale - 1);
|
|
on = uio->uio_offset % bsize;
|
|
n = ulmin((bsize - on), uio->uio_resid);
|
|
if (vp->v_lastr + bscale == bn) {
|
|
nextbn = bn + bscale;
|
|
error = breadn(vp, bn, bsize, &nextbn, &bsize,
|
|
1, &bp);
|
|
} else
|
|
error = bread(vp, bn, bsize, &bp);
|
|
vp->v_lastr = bn;
|
|
n = ulmin(n, bsize - bp->b_resid);
|
|
if (error) {
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
error = uiomove((char *)bp->b_data + on, n, uio);
|
|
brelse(bp);
|
|
} while (error == 0 && uio->uio_resid > 0 && n != 0);
|
|
return (error);
|
|
|
|
default:
|
|
panic("spec_read type");
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
int
|
|
spec_inactive(void *v)
|
|
{
|
|
struct vop_inactive_args *ap = v;
|
|
|
|
VOP_UNLOCK(ap->a_vp);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Vnode op for write
|
|
*/
|
|
int
|
|
spec_write(void *v)
|
|
{
|
|
struct vop_write_args *ap = v;
|
|
struct vnode *vp = ap->a_vp;
|
|
struct uio *uio = ap->a_uio;
|
|
struct proc *p = uio->uio_procp;
|
|
struct buf *bp;
|
|
daddr_t bn, bscale;
|
|
int bsize;
|
|
struct partinfo dpart;
|
|
size_t n;
|
|
int on, majordev;
|
|
int (*ioctl)(dev_t, u_long, caddr_t, int, struct proc *);
|
|
int error = 0;
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (uio->uio_rw != UIO_WRITE)
|
|
panic("spec_write mode");
|
|
if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc)
|
|
panic("spec_write proc");
|
|
#endif
|
|
|
|
switch (vp->v_type) {
|
|
|
|
case VCHR:
|
|
VOP_UNLOCK(vp);
|
|
error = (*cdevsw[major(vp->v_rdev)].d_write)
|
|
(vp->v_rdev, uio, ap->a_ioflag);
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
return (error);
|
|
|
|
case VBLK:
|
|
if (uio->uio_resid == 0)
|
|
return (0);
|
|
if (uio->uio_offset < 0)
|
|
return (EINVAL);
|
|
bsize = BLKDEV_IOSIZE;
|
|
if ((majordev = major(vp->v_rdev)) < nblkdev &&
|
|
(ioctl = bdevsw[majordev].d_ioctl) != NULL &&
|
|
(*ioctl)(vp->v_rdev, DIOCGPART, (caddr_t)&dpart, FREAD, p) == 0) {
|
|
u_int32_t frag =
|
|
DISKLABELV1_FFS_FRAG(dpart.part->p_fragblock);
|
|
u_int32_t fsize =
|
|
DISKLABELV1_FFS_FSIZE(dpart.part->p_fragblock);
|
|
if (dpart.part->p_fstype == FS_BSDFFS && frag != 0 &&
|
|
fsize != 0)
|
|
bsize = frag * fsize;
|
|
}
|
|
bscale = btodb(bsize);
|
|
do {
|
|
bn = btodb(uio->uio_offset) & ~(bscale - 1);
|
|
on = uio->uio_offset % bsize;
|
|
n = ulmin((bsize - on), uio->uio_resid);
|
|
error = bread(vp, bn, bsize, &bp);
|
|
n = ulmin(n, bsize - bp->b_resid);
|
|
if (error) {
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
error = uiomove((char *)bp->b_data + on, n, uio);
|
|
if (n + on == bsize)
|
|
bawrite(bp);
|
|
else
|
|
bdwrite(bp);
|
|
} while (error == 0 && uio->uio_resid > 0 && n != 0);
|
|
return (error);
|
|
|
|
default:
|
|
panic("spec_write type");
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* Device ioctl operation.
|
|
*/
|
|
int
|
|
spec_ioctl(void *v)
|
|
{
|
|
struct vop_ioctl_args *ap = v;
|
|
dev_t dev = ap->a_vp->v_rdev;
|
|
int maj = major(dev);
|
|
|
|
switch (ap->a_vp->v_type) {
|
|
|
|
case VCHR:
|
|
return ((*cdevsw[maj].d_ioctl)(dev, ap->a_command, ap->a_data,
|
|
ap->a_fflag, ap->a_p));
|
|
|
|
case VBLK:
|
|
return ((*bdevsw[maj].d_ioctl)(dev, ap->a_command, ap->a_data,
|
|
ap->a_fflag, ap->a_p));
|
|
|
|
default:
|
|
panic("spec_ioctl");
|
|
/* NOTREACHED */
|
|
}
|
|
}
|
|
|
|
int
|
|
spec_kqfilter(void *v)
|
|
{
|
|
struct vop_kqfilter_args *ap = v;
|
|
dev_t dev;
|
|
|
|
dev = ap->a_vp->v_rdev;
|
|
|
|
switch (ap->a_vp->v_type) {
|
|
default:
|
|
if (ap->a_kn->kn_flags & (__EV_POLL | __EV_SELECT))
|
|
return seltrue_kqfilter(dev, ap->a_kn);
|
|
break;
|
|
case VCHR:
|
|
if (cdevsw[major(dev)].d_kqfilter)
|
|
return (*cdevsw[major(dev)].d_kqfilter)(dev, ap->a_kn);
|
|
}
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
/*
|
|
* Synch buffers associated with a block device
|
|
*/
|
|
int
|
|
spec_fsync(void *v)
|
|
{
|
|
struct vop_fsync_args *ap = v;
|
|
struct vnode *vp = ap->a_vp;
|
|
struct buf *bp;
|
|
struct buf *nbp;
|
|
int s;
|
|
|
|
if (vp->v_type == VCHR)
|
|
return (0);
|
|
/*
|
|
* Flush all dirty buffers associated with a block device.
|
|
*/
|
|
loop:
|
|
s = splbio();
|
|
LIST_FOREACH_SAFE(bp, &vp->v_dirtyblkhd, b_vnbufs, nbp) {
|
|
if ((bp->b_flags & B_BUSY))
|
|
continue;
|
|
if ((bp->b_flags & B_DELWRI) == 0)
|
|
panic("spec_fsync: not dirty");
|
|
bremfree(bp);
|
|
buf_acquire(bp);
|
|
splx(s);
|
|
bawrite(bp);
|
|
goto loop;
|
|
}
|
|
if (ap->a_waitfor == MNT_WAIT) {
|
|
vwaitforio (vp, 0, "spec_fsync", INFSLP);
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (!LIST_EMPTY(&vp->v_dirtyblkhd)) {
|
|
splx(s);
|
|
vprint("spec_fsync: dirty", vp);
|
|
goto loop;
|
|
}
|
|
#endif
|
|
}
|
|
splx(s);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
spec_strategy(void *v)
|
|
{
|
|
struct vop_strategy_args *ap = v;
|
|
struct buf *bp = ap->a_bp;
|
|
int maj = major(bp->b_dev);
|
|
|
|
(*bdevsw[maj].d_strategy)(bp);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Device close routine
|
|
*/
|
|
int
|
|
spec_close(void *v)
|
|
{
|
|
struct vop_close_args *ap = v;
|
|
struct proc *p = ap->a_p;
|
|
struct vnode *vp = ap->a_vp;
|
|
dev_t dev = vp->v_rdev;
|
|
int (*devclose)(dev_t, int, int, struct proc *);
|
|
int mode, relock, xlocked, error;
|
|
int clone = 0;
|
|
|
|
mtx_enter(&vnode_mtx);
|
|
xlocked = (vp->v_lflag & VXLOCK);
|
|
mtx_leave(&vnode_mtx);
|
|
|
|
switch (vp->v_type) {
|
|
case VCHR:
|
|
/*
|
|
* Hack: a tty device that is a controlling terminal
|
|
* has a reference from the session structure.
|
|
* We cannot easily tell that a character device is
|
|
* a controlling terminal, unless it is the closing
|
|
* process' controlling terminal. In that case,
|
|
* if the reference count is 2 (this last descriptor
|
|
* plus the session), release the reference from the session.
|
|
*/
|
|
if (vcount(vp) == 2 && p != NULL && p->p_p->ps_pgrp &&
|
|
vp == p->p_p->ps_pgrp->pg_session->s_ttyvp) {
|
|
vrele(vp);
|
|
p->p_p->ps_pgrp->pg_session->s_ttyvp = NULL;
|
|
}
|
|
if (cdevsw[major(dev)].d_flags & D_CLONE) {
|
|
clone = 1;
|
|
} else {
|
|
/*
|
|
* If the vnode is locked, then we are in the midst
|
|
* of forcibly closing the device, otherwise we only
|
|
* close on last reference.
|
|
*/
|
|
if (vcount(vp) > 1 && !xlocked)
|
|
return (0);
|
|
}
|
|
devclose = cdevsw[major(dev)].d_close;
|
|
mode = S_IFCHR;
|
|
break;
|
|
|
|
case VBLK:
|
|
/*
|
|
* On last close of a block device (that isn't mounted)
|
|
* we must invalidate any in core blocks, so that
|
|
* we can, for instance, change floppy disks. In order to do
|
|
* that, we must lock the vnode. If we are coming from
|
|
* vclean(), the vnode is already locked.
|
|
*/
|
|
if (!xlocked)
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
error = vinvalbuf(vp, V_SAVE, ap->a_cred, p, 0, INFSLP);
|
|
if (!xlocked)
|
|
VOP_UNLOCK(vp);
|
|
if (error)
|
|
return (error);
|
|
/*
|
|
* We do not want to really close the device if it
|
|
* is still in use unless we are trying to close it
|
|
* forcibly. Since every use (buffer, vnode, swap, cmap)
|
|
* holds a reference to the vnode, and because we mark
|
|
* any other vnodes that alias this device, when the
|
|
* sum of the reference counts on all the aliased
|
|
* vnodes descends to one, we are on last close.
|
|
*/
|
|
if (vcount(vp) > 1 && !xlocked)
|
|
return (0);
|
|
devclose = bdevsw[major(dev)].d_close;
|
|
mode = S_IFBLK;
|
|
break;
|
|
|
|
default:
|
|
panic("spec_close: not special");
|
|
}
|
|
|
|
/* release lock if held and this isn't coming from vclean() */
|
|
relock = VOP_ISLOCKED(vp) && !xlocked;
|
|
if (relock)
|
|
VOP_UNLOCK(vp);
|
|
error = (*devclose)(dev, ap->a_fflag, mode, p);
|
|
if (relock)
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
|
|
if (error == 0 && clone) {
|
|
struct vnode *pvp;
|
|
|
|
pvp = vp->v_specparent; /* get parent device */
|
|
clrbit(pvp->v_specbitmap, minor(dev) >> CLONE_SHIFT);
|
|
vrele(pvp);
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
spec_getattr(void *v)
|
|
{
|
|
struct vop_getattr_args *ap = v;
|
|
struct vnode *vp = ap->a_vp;
|
|
int error;
|
|
|
|
if (!(vp->v_flag & VCLONE))
|
|
return (EBADF);
|
|
|
|
vn_lock(vp->v_specparent, LK_EXCLUSIVE|LK_RETRY);
|
|
error = VOP_GETATTR(vp->v_specparent, ap->a_vap, ap->a_cred, ap->a_p);
|
|
VOP_UNLOCK(vp->v_specparent);
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
spec_setattr(void *v)
|
|
{
|
|
struct vop_getattr_args *ap = v;
|
|
struct proc *p = ap->a_p;
|
|
struct vnode *vp = ap->a_vp;
|
|
int error;
|
|
|
|
if (!(vp->v_flag & VCLONE))
|
|
return (EBADF);
|
|
|
|
vn_lock(vp->v_specparent, LK_EXCLUSIVE|LK_RETRY);
|
|
error = VOP_SETATTR(vp->v_specparent, ap->a_vap, ap->a_cred, p);
|
|
VOP_UNLOCK(vp->v_specparent);
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
spec_access(void *v)
|
|
{
|
|
struct vop_access_args *ap = v;
|
|
struct vnode *vp = ap->a_vp;
|
|
int error;
|
|
|
|
if (!(vp->v_flag & VCLONE))
|
|
return (EBADF);
|
|
|
|
vn_lock(vp->v_specparent, LK_EXCLUSIVE|LK_RETRY);
|
|
error = VOP_ACCESS(vp->v_specparent, ap->a_mode, ap->a_cred, ap->a_p);
|
|
VOP_UNLOCK(vp->v_specparent);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Print out the contents of a special device vnode.
|
|
*/
|
|
int
|
|
spec_print(void *v)
|
|
{
|
|
struct vop_print_args *ap = v;
|
|
|
|
printf("tag VT_NON, dev %d, %d\n", major(ap->a_vp->v_rdev),
|
|
minor(ap->a_vp->v_rdev));
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Return POSIX pathconf information applicable to special devices.
|
|
*/
|
|
int
|
|
spec_pathconf(void *v)
|
|
{
|
|
struct vop_pathconf_args *ap = v;
|
|
int error = 0;
|
|
|
|
switch (ap->a_name) {
|
|
case _PC_LINK_MAX:
|
|
*ap->a_retval = LINK_MAX;
|
|
break;
|
|
case _PC_MAX_CANON:
|
|
*ap->a_retval = MAX_CANON;
|
|
break;
|
|
case _PC_MAX_INPUT:
|
|
*ap->a_retval = MAX_INPUT;
|
|
break;
|
|
case _PC_CHOWN_RESTRICTED:
|
|
*ap->a_retval = 1;
|
|
break;
|
|
case _PC_VDISABLE:
|
|
*ap->a_retval = _POSIX_VDISABLE;
|
|
break;
|
|
case _PC_TIMESTAMP_RESOLUTION:
|
|
*ap->a_retval = 1;
|
|
break;
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Special device advisory byte-level locks.
|
|
*/
|
|
int
|
|
spec_advlock(void *v)
|
|
{
|
|
struct vop_advlock_args *ap = v;
|
|
struct vnode *vp = ap->a_vp;
|
|
|
|
return (lf_advlock(&vp->v_speclockf, (off_t)0, ap->a_id,
|
|
ap->a_op, ap->a_fl, ap->a_flags));
|
|
}
|
|
|
|
/*
|
|
* Copyright (c) 2006 Pedro Martelletto <pedro@ambientworks.net>
|
|
* Copyright (c) 2006 Thordur Bjornsson <thib@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.
|
|
*/
|
|
|
|
#ifdef CLONE_DEBUG
|
|
#define DNPRINTF(m...) do { printf(m); } while (0)
|
|
#else
|
|
#define DNPRINTF(m...) /* nothing */
|
|
#endif
|
|
|
|
int
|
|
spec_open_clone(struct vop_open_args *ap)
|
|
{
|
|
struct vnode *cvp, *vp = ap->a_vp;
|
|
struct cloneinfo *cip;
|
|
int error, i;
|
|
|
|
DNPRINTF("cloning vnode\n");
|
|
|
|
if (minor(vp->v_rdev) >= (1 << CLONE_SHIFT))
|
|
return (ENXIO);
|
|
|
|
for (i = 1; i < CLONE_MAPSZ * NBBY; i++)
|
|
if (isclr(vp->v_specbitmap, i)) {
|
|
setbit(vp->v_specbitmap, i);
|
|
break;
|
|
}
|
|
|
|
if (i == CLONE_MAPSZ * NBBY)
|
|
return (EBUSY); /* too many open instances */
|
|
|
|
error = cdevvp(makedev(major(vp->v_rdev),
|
|
(i << CLONE_SHIFT) | minor(vp->v_rdev)), &cvp);
|
|
if (error) {
|
|
clrbit(vp->v_specbitmap, i);
|
|
return (error); /* out of vnodes */
|
|
}
|
|
|
|
VOP_UNLOCK(vp);
|
|
|
|
error = cdevsw[major(vp->v_rdev)].d_open(cvp->v_rdev, ap->a_mode,
|
|
S_IFCHR, ap->a_p);
|
|
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
|
|
if (error) {
|
|
vput(cvp);
|
|
clrbit(vp->v_specbitmap, i);
|
|
return (error); /* device open failed */
|
|
}
|
|
|
|
cvp->v_flag |= VCLONE;
|
|
|
|
cip = malloc(sizeof(struct cloneinfo), M_TEMP, M_WAITOK);
|
|
cip->ci_data = vp->v_data;
|
|
cip->ci_vp = cvp;
|
|
|
|
cvp->v_specparent = vp;
|
|
vp->v_flag |= VCLONED;
|
|
vp->v_data = cip;
|
|
|
|
DNPRINTF("clone of vnode %p is vnode %p\n", vp, cvp);
|
|
|
|
return (0); /* device cloned */
|
|
}
|