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freebsd-dev/sys/fs/devfs/devfs_vnops.c
Ed Schouten 8dc9b4cf04 Let access overriding to TTYs depend on the cdev_priv, not the vnode. 
Basically this commit changes two things, which improves access to TTYs
in exceptional conditions. Basically the problem was that when you ran
jexec(8) to attach to a jail, you couldn't use /dev/tty (well, also the
node of the actual TTY, e.g. /dev/pts/X). This is very inconvenient if
you want to attach to screens quickly, use ssh(1), etc.

The fixes:

- Cache the cdev_priv of the controlling TTY in struct session. Change
  devfs_access() to compare against the cdev_priv instead of the vnode.
  This allows you to bypass UNIX permissions, even across different
  mounts of devfs.

- Extend devfs_prison_check() to unconditionally expose the device node
  of the controlling TTY, even if normal prison nesting rules normally
  don't allow this. This actually allows you to interact with this
  device node.

To be honest, I'm not really happy with this solution. We now have to
store three pointers to a controlling TTY (s_ttyp, s_ttyvp, s_ttydp).
In an ideal world, we should just get rid of the latter two and only use
s_ttyp, but this makes certian pieces of code very impractical (e.g.
devfs, kern_exit.c).

Reported by:	Many people
2009-12-19 18:42:12 +00:00

1623 lines
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/*-
* Copyright (c) 2000-2004
* Poul-Henning Kamp. All rights reserved.
* Copyright (c) 1989, 1992-1993, 1995
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software donated to Berkeley by
* Jan-Simon Pendry.
*
* 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. 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.
*
* @(#)kernfs_vnops.c 8.15 (Berkeley) 5/21/95
* From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vnops.c 1.43
*
* $FreeBSD$
*/
/*
* TODO:
* remove empty directories
* mkdir: want it ?
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/dirent.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/filio.h>
#include <sys/jail.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/stat.h>
#include <sys/sx.h>
#include <sys/time.h>
#include <sys/ttycom.h>
#include <sys/unistd.h>
#include <sys/vnode.h>
static struct vop_vector devfs_vnodeops;
static struct vop_vector devfs_specops;
static struct fileops devfs_ops_f;
#include <fs/devfs/devfs.h>
#include <fs/devfs/devfs_int.h>
#include <security/mac/mac_framework.h>
static MALLOC_DEFINE(M_CDEVPDATA, "DEVFSP", "Metainfo for cdev-fp data");
struct mtx devfs_de_interlock;
MTX_SYSINIT(devfs_de_interlock, &devfs_de_interlock, "devfs interlock", MTX_DEF);
struct sx clone_drain_lock;
SX_SYSINIT(clone_drain_lock, &clone_drain_lock, "clone events drain lock");
struct mtx cdevpriv_mtx;
MTX_SYSINIT(cdevpriv_mtx, &cdevpriv_mtx, "cdevpriv lock", MTX_DEF);
static int
devfs_fp_check(struct file *fp, struct cdev **devp, struct cdevsw **dswp)
{
*dswp = devvn_refthread(fp->f_vnode, devp);
if (*devp != fp->f_data) {
if (*dswp != NULL)
dev_relthread(*devp);
return (ENXIO);
}
KASSERT((*devp)->si_refcount > 0,
("devfs: un-referenced struct cdev *(%s)", devtoname(*devp)));
if (*dswp == NULL)
return (ENXIO);
curthread->td_fpop = fp;
return (0);
}
int
devfs_get_cdevpriv(void **datap)
{
struct file *fp;
struct cdev_privdata *p;
int error;
fp = curthread->td_fpop;
if (fp == NULL)
return (EBADF);
p = fp->f_cdevpriv;
if (p != NULL) {
error = 0;
*datap = p->cdpd_data;
} else
error = ENOENT;
return (error);
}
int
devfs_set_cdevpriv(void *priv, cdevpriv_dtr_t priv_dtr)
{
struct file *fp;
struct cdev_priv *cdp;
struct cdev_privdata *p;
int error;
fp = curthread->td_fpop;
if (fp == NULL)
return (ENOENT);
cdp = cdev2priv((struct cdev *)fp->f_data);
p = malloc(sizeof(struct cdev_privdata), M_CDEVPDATA, M_WAITOK);
p->cdpd_data = priv;
p->cdpd_dtr = priv_dtr;
p->cdpd_fp = fp;
mtx_lock(&cdevpriv_mtx);
if (fp->f_cdevpriv == NULL) {
LIST_INSERT_HEAD(&cdp->cdp_fdpriv, p, cdpd_list);
fp->f_cdevpriv = p;
mtx_unlock(&cdevpriv_mtx);
error = 0;
} else {
mtx_unlock(&cdevpriv_mtx);
free(p, M_CDEVPDATA);
error = EBUSY;
}
return (error);
}
void
devfs_destroy_cdevpriv(struct cdev_privdata *p)
{
mtx_assert(&cdevpriv_mtx, MA_OWNED);
p->cdpd_fp->f_cdevpriv = NULL;
LIST_REMOVE(p, cdpd_list);
mtx_unlock(&cdevpriv_mtx);
(p->cdpd_dtr)(p->cdpd_data);
free(p, M_CDEVPDATA);
}
void
devfs_fpdrop(struct file *fp)
{
struct cdev_privdata *p;
mtx_lock(&cdevpriv_mtx);
if ((p = fp->f_cdevpriv) == NULL) {
mtx_unlock(&cdevpriv_mtx);
return;
}
devfs_destroy_cdevpriv(p);
}
void
devfs_clear_cdevpriv(void)
{
struct file *fp;
fp = curthread->td_fpop;
if (fp == NULL)
return;
devfs_fpdrop(fp);
}
static int
devfs_vptocnp(struct vop_vptocnp_args *ap)
{
struct vnode *vp = ap->a_vp;
struct vnode **dvp = ap->a_vpp;
struct devfs_mount *dmp;
char *buf = ap->a_buf;
int *buflen = ap->a_buflen;
struct devfs_dirent *dd, *de;
int i, error;
dmp = VFSTODEVFS(vp->v_mount);
i = *buflen;
dd = vp->v_data;
error = 0;
sx_xlock(&dmp->dm_lock);
if (vp->v_type == VCHR) {
i -= strlen(dd->de_cdp->cdp_c.si_name);
if (i < 0) {
error = ENOMEM;
goto finished;
}
bcopy(dd->de_cdp->cdp_c.si_name, buf + i,
strlen(dd->de_cdp->cdp_c.si_name));
de = dd->de_dir;
} else if (vp->v_type == VDIR) {
if (dd == dmp->dm_rootdir) {
*dvp = vp;
vhold(*dvp);
goto finished;
}
i -= dd->de_dirent->d_namlen;
if (i < 0) {
error = ENOMEM;
goto finished;
}
bcopy(dd->de_dirent->d_name, buf + i,
dd->de_dirent->d_namlen);
de = dd;
} else {
error = ENOENT;
goto finished;
}
*buflen = i;
de = TAILQ_FIRST(&de->de_dlist); /* "." */
de = TAILQ_NEXT(de, de_list); /* ".." */
de = de->de_dir;
mtx_lock(&devfs_de_interlock);
*dvp = de->de_vnode;
if (*dvp != NULL) {
VI_LOCK(*dvp);
mtx_unlock(&devfs_de_interlock);
vholdl(*dvp);
VI_UNLOCK(*dvp);
} else {
mtx_unlock(&devfs_de_interlock);
error = ENOENT;
}
finished:
sx_xunlock(&dmp->dm_lock);
return (error);
}
/*
* Construct the fully qualified path name relative to the mountpoint
*/
static char *
devfs_fqpn(char *buf, struct vnode *dvp, struct componentname *cnp)
{
int i;
struct devfs_dirent *de, *dd;
struct devfs_mount *dmp;
dmp = VFSTODEVFS(dvp->v_mount);
dd = dvp->v_data;
i = SPECNAMELEN;
buf[i] = '\0';
i -= cnp->cn_namelen;
if (i < 0)
return (NULL);
bcopy(cnp->cn_nameptr, buf + i, cnp->cn_namelen);
de = dd;
while (de != dmp->dm_rootdir) {
i--;
if (i < 0)
return (NULL);
buf[i] = '/';
i -= de->de_dirent->d_namlen;
if (i < 0)
return (NULL);
bcopy(de->de_dirent->d_name, buf + i,
de->de_dirent->d_namlen);
de = TAILQ_FIRST(&de->de_dlist); /* "." */
de = TAILQ_NEXT(de, de_list); /* ".." */
de = de->de_dir;
}
return (buf + i);
}
static int
devfs_allocv_drop_refs(int drop_dm_lock, struct devfs_mount *dmp,
struct devfs_dirent *de)
{
int not_found;
not_found = 0;
if (de->de_flags & DE_DOOMED)
not_found = 1;
if (DEVFS_DE_DROP(de)) {
KASSERT(not_found == 1, ("DEVFS de dropped but not doomed"));
devfs_dirent_free(de);
}
if (DEVFS_DMP_DROP(dmp)) {
KASSERT(not_found == 1,
("DEVFS mount struct freed before dirent"));
not_found = 2;
sx_xunlock(&dmp->dm_lock);
devfs_unmount_final(dmp);
}
if (not_found == 1 || (drop_dm_lock && not_found != 2))
sx_unlock(&dmp->dm_lock);
return (not_found);
}
static void
devfs_insmntque_dtr(struct vnode *vp, void *arg)
{
struct devfs_dirent *de;
de = (struct devfs_dirent *)arg;
mtx_lock(&devfs_de_interlock);
vp->v_data = NULL;
de->de_vnode = NULL;
mtx_unlock(&devfs_de_interlock);
vgone(vp);
vput(vp);
}
/*
* devfs_allocv shall be entered with dmp->dm_lock held, and it drops
* it on return.
*/
int
devfs_allocv(struct devfs_dirent *de, struct mount *mp, struct vnode **vpp)
{
int error;
struct vnode *vp;
struct cdev *dev;
struct devfs_mount *dmp;
dmp = VFSTODEVFS(mp);
if (de->de_flags & DE_DOOMED) {
sx_xunlock(&dmp->dm_lock);
return (ENOENT);
}
DEVFS_DE_HOLD(de);
DEVFS_DMP_HOLD(dmp);
mtx_lock(&devfs_de_interlock);
vp = de->de_vnode;
if (vp != NULL) {
VI_LOCK(vp);
mtx_unlock(&devfs_de_interlock);
sx_xunlock(&dmp->dm_lock);
error = vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, curthread);
sx_xlock(&dmp->dm_lock);
if (devfs_allocv_drop_refs(0, dmp, de)) {
if (error == 0)
vput(vp);
return (ENOENT);
}
else if (error) {
sx_xunlock(&dmp->dm_lock);
return (error);
}
sx_xunlock(&dmp->dm_lock);
*vpp = vp;
return (0);
}
mtx_unlock(&devfs_de_interlock);
if (de->de_dirent->d_type == DT_CHR) {
if (!(de->de_cdp->cdp_flags & CDP_ACTIVE)) {
devfs_allocv_drop_refs(1, dmp, de);
return (ENOENT);
}
dev = &de->de_cdp->cdp_c;
} else {
dev = NULL;
}
error = getnewvnode("devfs", mp, &devfs_vnodeops, &vp);
if (error != 0) {
devfs_allocv_drop_refs(1, dmp, de);
printf("devfs_allocv: failed to allocate new vnode\n");
return (error);
}
if (de->de_dirent->d_type == DT_CHR) {
vp->v_type = VCHR;
VI_LOCK(vp);
dev_lock();
dev_refl(dev);
/* XXX: v_rdev should be protect by vnode lock */
vp->v_rdev = dev;
KASSERT(vp->v_usecount == 1,
("%s %d (%d)\n", __func__, __LINE__, vp->v_usecount));
dev->si_usecount += vp->v_usecount;
dev_unlock();
VI_UNLOCK(vp);
vp->v_op = &devfs_specops;
} else if (de->de_dirent->d_type == DT_DIR) {
vp->v_type = VDIR;
} else if (de->de_dirent->d_type == DT_LNK) {
vp->v_type = VLNK;
} else {
vp->v_type = VBAD;
}
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_NOWITNESS);
mtx_lock(&devfs_de_interlock);
vp->v_data = de;
de->de_vnode = vp;
mtx_unlock(&devfs_de_interlock);
error = insmntque1(vp, mp, devfs_insmntque_dtr, de);
if (error != 0) {
(void) devfs_allocv_drop_refs(1, dmp, de);
return (error);
}
if (devfs_allocv_drop_refs(0, dmp, de)) {
vput(vp);
return (ENOENT);
}
#ifdef MAC
mac_devfs_vnode_associate(mp, de, vp);
#endif
sx_xunlock(&dmp->dm_lock);
*vpp = vp;
return (0);
}
static int
devfs_access(struct vop_access_args *ap)
{
struct vnode *vp = ap->a_vp;
struct devfs_dirent *de;
int error;
de = vp->v_data;
if (vp->v_type == VDIR)
de = de->de_dir;
error = vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid,
ap->a_accmode, ap->a_cred, NULL);
if (error == 0)
return (0);
if (error != EACCES)
return (error);
/* We do, however, allow access to the controlling terminal */
if (!(ap->a_td->td_proc->p_flag & P_CONTROLT))
return (error);
if (ap->a_td->td_proc->p_session->s_ttydp == de->de_cdp)
return (0);
return (error);
}
/* ARGSUSED */
static int
devfs_close(struct vop_close_args *ap)
{
struct vnode *vp = ap->a_vp, *oldvp;
struct thread *td = ap->a_td;
struct cdev *dev = vp->v_rdev;
struct cdevsw *dsw;
int vp_locked, error;
/*
* 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.
*/
oldvp = NULL;
sx_xlock(&proctree_lock);
if (td && vp == td->td_proc->p_session->s_ttyvp) {
SESS_LOCK(td->td_proc->p_session);
VI_LOCK(vp);
if (count_dev(dev) == 2 && (vp->v_iflag & VI_DOOMED) == 0) {
td->td_proc->p_session->s_ttyvp = NULL;
td->td_proc->p_session->s_ttydp = NULL;
oldvp = vp;
}
VI_UNLOCK(vp);
SESS_UNLOCK(td->td_proc->p_session);
}
sx_xunlock(&proctree_lock);
if (oldvp != NULL)
vrele(oldvp);
/*
* 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.
*/
dsw = dev_refthread(dev);
if (dsw == NULL)
return (ENXIO);
VI_LOCK(vp);
if (vp->v_iflag & VI_DOOMED) {
/* Forced close. */
} else if (dsw->d_flags & D_TRACKCLOSE) {
/* Keep device updated on status. */
} else if (count_dev(dev) > 1) {
VI_UNLOCK(vp);
dev_relthread(dev);
return (0);
}
vholdl(vp);
VI_UNLOCK(vp);
vp_locked = VOP_ISLOCKED(vp);
VOP_UNLOCK(vp, 0);
KASSERT(dev->si_refcount > 0,
("devfs_close() on un-referenced struct cdev *(%s)", devtoname(dev)));
error = dsw->d_close(dev, ap->a_fflag, S_IFCHR, td);
dev_relthread(dev);
vn_lock(vp, vp_locked | LK_RETRY);
vdrop(vp);
return (error);
}
static int
devfs_close_f(struct file *fp, struct thread *td)
{
int error;
struct file *fpop;
fpop = td->td_fpop;
td->td_fpop = fp;
error = vnops.fo_close(fp, td);
td->td_fpop = fpop;
return (error);
}
static int
devfs_fsync(struct vop_fsync_args *ap)
{
int error;
struct bufobj *bo;
struct devfs_dirent *de;
if (!vn_isdisk(ap->a_vp, &error)) {
bo = &ap->a_vp->v_bufobj;
de = ap->a_vp->v_data;
if (error == ENXIO && bo->bo_dirty.bv_cnt > 0) {
printf("Device %s went missing before all of the data "
"could be written to it; expect data loss.\n",
de->de_dirent->d_name);
error = vop_stdfsync(ap);
if (bo->bo_dirty.bv_cnt != 0 || error != 0)
panic("devfs_fsync: vop_stdfsync failed.");
}
return (0);
}
return (vop_stdfsync(ap));
}
static int
devfs_getattr(struct vop_getattr_args *ap)
{
struct vnode *vp = ap->a_vp;
struct vattr *vap = ap->a_vap;
int error = 0;
struct devfs_dirent *de;
struct cdev *dev;
de = vp->v_data;
KASSERT(de != NULL, ("Null dirent in devfs_getattr vp=%p", vp));
if (vp->v_type == VDIR) {
de = de->de_dir;
KASSERT(de != NULL,
("Null dir dirent in devfs_getattr vp=%p", vp));
}
vap->va_uid = de->de_uid;
vap->va_gid = de->de_gid;
vap->va_mode = de->de_mode;
if (vp->v_type == VLNK)
vap->va_size = strlen(de->de_symlink);
else if (vp->v_type == VDIR)
vap->va_size = vap->va_bytes = DEV_BSIZE;
else
vap->va_size = 0;
if (vp->v_type != VDIR)
vap->va_bytes = 0;
vap->va_blocksize = DEV_BSIZE;
vap->va_type = vp->v_type;
#define fix(aa) \
do { \
if ((aa).tv_sec <= 3600) { \
(aa).tv_sec = boottime.tv_sec; \
(aa).tv_nsec = boottime.tv_usec * 1000; \
} \
} while (0)
if (vp->v_type != VCHR) {
fix(de->de_atime);
vap->va_atime = de->de_atime;
fix(de->de_mtime);
vap->va_mtime = de->de_mtime;
fix(de->de_ctime);
vap->va_ctime = de->de_ctime;
} else {
dev = vp->v_rdev;
fix(dev->si_atime);
vap->va_atime = dev->si_atime;
fix(dev->si_mtime);
vap->va_mtime = dev->si_mtime;
fix(dev->si_ctime);
vap->va_ctime = dev->si_ctime;
vap->va_rdev = cdev2priv(dev)->cdp_inode;
}
vap->va_gen = 0;
vap->va_flags = 0;
vap->va_filerev = 0;
vap->va_nlink = de->de_links;
vap->va_fileid = de->de_inode;
return (error);
}
/* ARGSUSED */
static int
devfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struct thread *td)
{
struct cdev *dev;
struct cdevsw *dsw;
struct vnode *vp;
struct vnode *vpold;
int error, i;
const char *p;
struct fiodgname_arg *fgn;
struct file *fpop;
fpop = td->td_fpop;
error = devfs_fp_check(fp, &dev, &dsw);
if (error)
return (error);
if (com == FIODTYPE) {
*(int *)data = dsw->d_flags & D_TYPEMASK;
td->td_fpop = fpop;
dev_relthread(dev);
return (0);
} else if (com == FIODGNAME) {
fgn = data;
p = devtoname(dev);
i = strlen(p) + 1;
if (i > fgn->len)
error = EINVAL;
else
error = copyout(p, fgn->buf, i);
td->td_fpop = fpop;
dev_relthread(dev);
return (error);
}
error = dsw->d_ioctl(dev, com, data, fp->f_flag, td);
td->td_fpop = NULL;
dev_relthread(dev);
if (error == ENOIOCTL)
error = ENOTTY;
if (error == 0 && com == TIOCSCTTY) {
vp = fp->f_vnode;
/* Do nothing if reassigning same control tty */
sx_slock(&proctree_lock);
if (td->td_proc->p_session->s_ttyvp == vp) {
sx_sunlock(&proctree_lock);
return (0);
}
vpold = td->td_proc->p_session->s_ttyvp;
VREF(vp);
SESS_LOCK(td->td_proc->p_session);
td->td_proc->p_session->s_ttyvp = vp;
td->td_proc->p_session->s_ttydp = cdev2priv(dev);
SESS_UNLOCK(td->td_proc->p_session);
sx_sunlock(&proctree_lock);
/* Get rid of reference to old control tty */
if (vpold)
vrele(vpold);
}
return (error);
}
/* ARGSUSED */
static int
devfs_kqfilter_f(struct file *fp, struct knote *kn)
{
struct cdev *dev;
struct cdevsw *dsw;
int error;
struct file *fpop;
struct thread *td;
td = curthread;
fpop = td->td_fpop;
error = devfs_fp_check(fp, &dev, &dsw);
if (error)
return (error);
error = dsw->d_kqfilter(dev, kn);
td->td_fpop = fpop;
dev_relthread(dev);
return (error);
}
static inline int
devfs_prison_check(struct devfs_dirent *de, struct thread *td)
{
struct cdev_priv *cdp;
struct ucred *dcr;
int error;
cdp = de->de_cdp;
if (cdp == NULL)
return (0);
dcr = cdp->cdp_c.si_cred;
if (dcr == NULL)
return (0);
error = prison_check(td->td_ucred, dcr);
if (error == 0)
return (0);
/* We do, however, allow access to the controlling terminal */
if (!(td->td_proc->p_flag & P_CONTROLT))
return (error);
if (td->td_proc->p_session->s_ttydp == cdp)
return (0);
return (error);
}
static int
devfs_lookupx(struct vop_lookup_args *ap, int *dm_unlock)
{
struct componentname *cnp;
struct vnode *dvp, **vpp;
struct thread *td;
struct devfs_dirent *de, *dd;
struct devfs_dirent **dde;
struct devfs_mount *dmp;
struct cdev *cdev;
int error, flags, nameiop;
char specname[SPECNAMELEN + 1], *pname;
cnp = ap->a_cnp;
vpp = ap->a_vpp;
dvp = ap->a_dvp;
pname = cnp->cn_nameptr;
td = cnp->cn_thread;
flags = cnp->cn_flags;
nameiop = cnp->cn_nameiop;
dmp = VFSTODEVFS(dvp->v_mount);
dd = dvp->v_data;
*vpp = NULLVP;
if ((flags & ISLASTCN) && nameiop == RENAME)
return (EOPNOTSUPP);
if (dvp->v_type != VDIR)
return (ENOTDIR);
if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT))
return (EIO);
error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td);
if (error)
return (error);
if (cnp->cn_namelen == 1 && *pname == '.') {
if ((flags & ISLASTCN) && nameiop != LOOKUP)
return (EINVAL);
*vpp = dvp;
VREF(dvp);
return (0);
}
if (flags & ISDOTDOT) {
if ((flags & ISLASTCN) && nameiop != LOOKUP)
return (EINVAL);
VOP_UNLOCK(dvp, 0);
de = TAILQ_FIRST(&dd->de_dlist); /* "." */
de = TAILQ_NEXT(de, de_list); /* ".." */
de = de->de_dir;
error = devfs_allocv(de, dvp->v_mount, vpp);
*dm_unlock = 0;
vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
return (error);
}
DEVFS_DMP_HOLD(dmp);
devfs_populate(dmp);
if (DEVFS_DMP_DROP(dmp)) {
*dm_unlock = 0;
sx_xunlock(&dmp->dm_lock);
devfs_unmount_final(dmp);
return (ENOENT);
}
dd = dvp->v_data;
de = devfs_find(dd, cnp->cn_nameptr, cnp->cn_namelen);
while (de == NULL) { /* While(...) so we can use break */
if (nameiop == DELETE)
return (ENOENT);
/*
* OK, we didn't have an entry for the name we were asked for
* so we try to see if anybody can create it on demand.
*/
pname = devfs_fqpn(specname, dvp, cnp);
if (pname == NULL)
break;
cdev = NULL;
DEVFS_DMP_HOLD(dmp);
sx_xunlock(&dmp->dm_lock);
sx_slock(&clone_drain_lock);
EVENTHANDLER_INVOKE(dev_clone,
td->td_ucred, pname, strlen(pname), &cdev);
sx_sunlock(&clone_drain_lock);
sx_xlock(&dmp->dm_lock);
if (DEVFS_DMP_DROP(dmp)) {
*dm_unlock = 0;
sx_xunlock(&dmp->dm_lock);
devfs_unmount_final(dmp);
return (ENOENT);
}
if (cdev == NULL)
break;
DEVFS_DMP_HOLD(dmp);
devfs_populate(dmp);
if (DEVFS_DMP_DROP(dmp)) {
*dm_unlock = 0;
sx_xunlock(&dmp->dm_lock);
devfs_unmount_final(dmp);
return (ENOENT);
}
dev_lock();
dde = &cdev2priv(cdev)->cdp_dirents[dmp->dm_idx];
if (dde != NULL && *dde != NULL)
de = *dde;
dev_unlock();
dev_rel(cdev);
break;
}
if (de == NULL || de->de_flags & DE_WHITEOUT) {
if ((nameiop == CREATE || nameiop == RENAME) &&
(flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) {
cnp->cn_flags |= SAVENAME;
return (EJUSTRETURN);
}
return (ENOENT);
}
if (devfs_prison_check(de, td))
return (ENOENT);
if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) {
error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
if (error)
return (error);
if (*vpp == dvp) {
VREF(dvp);
*vpp = dvp;
return (0);
}
}
error = devfs_allocv(de, dvp->v_mount, vpp);
*dm_unlock = 0;
return (error);
}
static int
devfs_lookup(struct vop_lookup_args *ap)
{
int j;
struct devfs_mount *dmp;
int dm_unlock;
dmp = VFSTODEVFS(ap->a_dvp->v_mount);
dm_unlock = 1;
sx_xlock(&dmp->dm_lock);
j = devfs_lookupx(ap, &dm_unlock);
if (dm_unlock == 1)
sx_xunlock(&dmp->dm_lock);
return (j);
}
static int
devfs_mknod(struct vop_mknod_args *ap)
{
struct componentname *cnp;
struct vnode *dvp, **vpp;
struct devfs_dirent *dd, *de;
struct devfs_mount *dmp;
int error;
/*
* The only type of node we should be creating here is a
* character device, for anything else return EOPNOTSUPP.
*/
if (ap->a_vap->va_type != VCHR)
return (EOPNOTSUPP);
dvp = ap->a_dvp;
dmp = VFSTODEVFS(dvp->v_mount);
cnp = ap->a_cnp;
vpp = ap->a_vpp;
dd = dvp->v_data;
error = ENOENT;
sx_xlock(&dmp->dm_lock);
TAILQ_FOREACH(de, &dd->de_dlist, de_list) {
if (cnp->cn_namelen != de->de_dirent->d_namlen)
continue;
if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name,
de->de_dirent->d_namlen) != 0)
continue;
if (de->de_flags & DE_WHITEOUT)
break;
goto notfound;
}
if (de == NULL)
goto notfound;
de->de_flags &= ~DE_WHITEOUT;
error = devfs_allocv(de, dvp->v_mount, vpp);
return (error);
notfound:
sx_xunlock(&dmp->dm_lock);
return (error);
}
/* ARGSUSED */
static int
devfs_open(struct vop_open_args *ap)
{
struct thread *td = ap->a_td;
struct vnode *vp = ap->a_vp;
struct cdev *dev = vp->v_rdev;
struct file *fp = ap->a_fp;
int error;
struct cdevsw *dsw;
struct file *fpop;
if (vp->v_type == VBLK)
return (ENXIO);
if (dev == NULL)
return (ENXIO);
/* Make this field valid before any I/O in d_open. */
if (dev->si_iosize_max == 0)
dev->si_iosize_max = DFLTPHYS;
dsw = dev_refthread(dev);
if (dsw == NULL)
return (ENXIO);
/* XXX: Special casing of ttys for deadfs. Probably redundant. */
if (dsw->d_flags & D_TTY)
vp->v_vflag |= VV_ISTTY;
VOP_UNLOCK(vp, 0);
fpop = td->td_fpop;
td->td_fpop = fp;
if (fp != NULL) {
fp->f_data = dev;
fp->f_vnode = vp;
}
if (dsw->d_fdopen != NULL)
error = dsw->d_fdopen(dev, ap->a_mode, td, fp);
else
error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td);
td->td_fpop = fpop;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
dev_relthread(dev);
if (error)
return (error);
#if 0 /* /dev/console */
KASSERT(fp != NULL,
("Could not vnode bypass device on NULL fp"));
#else
if(fp == NULL)
return (error);
#endif
if (fp->f_ops == &badfileops)
finit(fp, fp->f_flag, DTYPE_VNODE, dev, &devfs_ops_f);
return (error);
}
static int
devfs_pathconf(struct vop_pathconf_args *ap)
{
switch (ap->a_name) {
case _PC_MAC_PRESENT:
#ifdef MAC
/*
* If MAC is enabled, devfs automatically supports
* trivial non-persistant label storage.
*/
*ap->a_retval = 1;
#else
*ap->a_retval = 0;
#endif
return (0);
default:
return (vop_stdpathconf(ap));
}
/* NOTREACHED */
}
/* ARGSUSED */
static int
devfs_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td)
{
struct cdev *dev;
struct cdevsw *dsw;
int error;
struct file *fpop;
fpop = td->td_fpop;
error = devfs_fp_check(fp, &dev, &dsw);
if (error)
return (poll_no_poll(events));
error = dsw->d_poll(dev, events, td);
td->td_fpop = fpop;
dev_relthread(dev);
return(error);
}
/*
* Print out the contents of a special device vnode.
*/
static int
devfs_print(struct vop_print_args *ap)
{
printf("\tdev %s\n", devtoname(ap->a_vp->v_rdev));
return (0);
}
/* ARGSUSED */
static int
devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td)
{
struct cdev *dev;
int ioflag, error, resid;
struct cdevsw *dsw;
struct file *fpop;
fpop = td->td_fpop;
error = devfs_fp_check(fp, &dev, &dsw);
if (error)
return (error);
resid = uio->uio_resid;
ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT);
if (ioflag & O_DIRECT)
ioflag |= IO_DIRECT;
if ((flags & FOF_OFFSET) == 0)
uio->uio_offset = fp->f_offset;
error = dsw->d_read(dev, uio, ioflag);
if (uio->uio_resid != resid || (error == 0 && resid != 0))
vfs_timestamp(&dev->si_atime);
td->td_fpop = fpop;
dev_relthread(dev);
if ((flags & FOF_OFFSET) == 0)
fp->f_offset = uio->uio_offset;
fp->f_nextoff = uio->uio_offset;
return (error);
}
static int
devfs_readdir(struct vop_readdir_args *ap)
{
int error;
struct uio *uio;
struct dirent *dp;
struct devfs_dirent *dd;
struct devfs_dirent *de;
struct devfs_mount *dmp;
off_t off;
int *tmp_ncookies = NULL;
if (ap->a_vp->v_type != VDIR)
return (ENOTDIR);
uio = ap->a_uio;
if (uio->uio_offset < 0)
return (EINVAL);
/*
* XXX: This is a temporary hack to get around this filesystem not
* supporting cookies. We store the location of the ncookies pointer
* in a temporary variable before calling vfs_subr.c:vfs_read_dirent()
* and set the number of cookies to 0. We then set the pointer to
* NULL so that vfs_read_dirent doesn't try to call realloc() on
* ap->a_cookies. Later in this function, we restore the ap->a_ncookies
* pointer to its original location before returning to the caller.
*/
if (ap->a_ncookies != NULL) {
tmp_ncookies = ap->a_ncookies;
*ap->a_ncookies = 0;
ap->a_ncookies = NULL;
}
dmp = VFSTODEVFS(ap->a_vp->v_mount);
sx_xlock(&dmp->dm_lock);
DEVFS_DMP_HOLD(dmp);
devfs_populate(dmp);
if (DEVFS_DMP_DROP(dmp)) {
sx_xunlock(&dmp->dm_lock);
devfs_unmount_final(dmp);
if (tmp_ncookies != NULL)
ap->a_ncookies = tmp_ncookies;
return (EIO);
}
error = 0;
de = ap->a_vp->v_data;
off = 0;
TAILQ_FOREACH(dd, &de->de_dlist, de_list) {
KASSERT(dd->de_cdp != (void *)0xdeadc0de, ("%s %d\n", __func__, __LINE__));
if (dd->de_flags & DE_WHITEOUT)
continue;
if (devfs_prison_check(dd, uio->uio_td))
continue;
if (dd->de_dirent->d_type == DT_DIR)
de = dd->de_dir;
else
de = dd;
dp = dd->de_dirent;
if (dp->d_reclen > uio->uio_resid)
break;
dp->d_fileno = de->de_inode;
if (off >= uio->uio_offset) {
error = vfs_read_dirent(ap, dp, off);
if (error)
break;
}
off += dp->d_reclen;
}
sx_xunlock(&dmp->dm_lock);
uio->uio_offset = off;
/*
* Restore ap->a_ncookies if it wasn't originally NULL in the first
* place.
*/
if (tmp_ncookies != NULL)
ap->a_ncookies = tmp_ncookies;
return (error);
}
static int
devfs_readlink(struct vop_readlink_args *ap)
{
struct devfs_dirent *de;
de = ap->a_vp->v_data;
return (uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio));
}
static int
devfs_reclaim(struct vop_reclaim_args *ap)
{
struct vnode *vp = ap->a_vp;
struct devfs_dirent *de;
struct cdev *dev;
mtx_lock(&devfs_de_interlock);
de = vp->v_data;
if (de != NULL) {
de->de_vnode = NULL;
vp->v_data = NULL;
}
mtx_unlock(&devfs_de_interlock);
vnode_destroy_vobject(vp);
VI_LOCK(vp);
dev_lock();
dev = vp->v_rdev;
vp->v_rdev = NULL;
if (dev == NULL) {
dev_unlock();
VI_UNLOCK(vp);
return (0);
}
dev->si_usecount -= vp->v_usecount;
dev_unlock();
VI_UNLOCK(vp);
dev_rel(dev);
return (0);
}
static int
devfs_remove(struct vop_remove_args *ap)
{
struct vnode *vp = ap->a_vp;
struct devfs_dirent *dd;
struct devfs_dirent *de;
struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount);
sx_xlock(&dmp->dm_lock);
dd = ap->a_dvp->v_data;
de = vp->v_data;
if (de->de_cdp == NULL) {
TAILQ_REMOVE(&dd->de_dlist, de, de_list);
devfs_delete(dmp, de, 1);
} else {
de->de_flags |= DE_WHITEOUT;
}
sx_xunlock(&dmp->dm_lock);
return (0);
}
/*
* Revoke is called on a tty when a terminal session ends. The vnode
* is orphaned by setting v_op to deadfs so we need to let go of it
* as well so that we create a new one next time around.
*
*/
static int
devfs_revoke(struct vop_revoke_args *ap)
{
struct vnode *vp = ap->a_vp, *vp2;
struct cdev *dev;
struct cdev_priv *cdp;
struct devfs_dirent *de;
int i;
KASSERT((ap->a_flags & REVOKEALL) != 0, ("devfs_revoke !REVOKEALL"));
dev = vp->v_rdev;
cdp = cdev2priv(dev);
dev_lock();
cdp->cdp_inuse++;
dev_unlock();
vhold(vp);
vgone(vp);
vdrop(vp);
VOP_UNLOCK(vp,0);
loop:
for (;;) {
mtx_lock(&devfs_de_interlock);
dev_lock();
vp2 = NULL;
for (i = 0; i <= cdp->cdp_maxdirent; i++) {
de = cdp->cdp_dirents[i];
if (de == NULL)
continue;
vp2 = de->de_vnode;
if (vp2 != NULL) {
dev_unlock();
VI_LOCK(vp2);
mtx_unlock(&devfs_de_interlock);
if (vget(vp2, LK_EXCLUSIVE | LK_INTERLOCK,
curthread))
goto loop;
vhold(vp2);
vgone(vp2);
vdrop(vp2);
vput(vp2);
break;
}
}
if (vp2 != NULL) {
continue;
}
dev_unlock();
mtx_unlock(&devfs_de_interlock);
break;
}
dev_lock();
cdp->cdp_inuse--;
if (!(cdp->cdp_flags & CDP_ACTIVE) && cdp->cdp_inuse == 0) {
TAILQ_REMOVE(&cdevp_list, cdp, cdp_list);
dev_unlock();
dev_rel(&cdp->cdp_c);
} else
dev_unlock();
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
return (0);
}
static int
devfs_rioctl(struct vop_ioctl_args *ap)
{
struct vnode *vp;
struct devfs_mount *dmp;
int error;
vp = ap->a_vp;
vn_lock(vp, LK_SHARED | LK_RETRY);
if (vp->v_iflag & VI_DOOMED) {
VOP_UNLOCK(vp, 0);
return (EBADF);
}
dmp = VFSTODEVFS(vp->v_mount);
sx_xlock(&dmp->dm_lock);
VOP_UNLOCK(vp, 0);
DEVFS_DMP_HOLD(dmp);
devfs_populate(dmp);
if (DEVFS_DMP_DROP(dmp)) {
sx_xunlock(&dmp->dm_lock);
devfs_unmount_final(dmp);
return (ENOENT);
}
error = devfs_rules_ioctl(dmp, ap->a_command, ap->a_data, ap->a_td);
sx_xunlock(&dmp->dm_lock);
return (error);
}
static int
devfs_rread(struct vop_read_args *ap)
{
if (ap->a_vp->v_type != VDIR)
return (EINVAL);
return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL));
}
static int
devfs_setattr(struct vop_setattr_args *ap)
{
struct devfs_dirent *de;
struct vattr *vap;
struct vnode *vp;
struct thread *td;
int c, error;
uid_t uid;
gid_t gid;
vap = ap->a_vap;
vp = ap->a_vp;
td = curthread;
if ((vap->va_type != VNON) ||
(vap->va_nlink != VNOVAL) ||
(vap->va_fsid != VNOVAL) ||
(vap->va_fileid != VNOVAL) ||
(vap->va_blocksize != VNOVAL) ||
(vap->va_flags != VNOVAL && vap->va_flags != 0) ||
(vap->va_rdev != VNOVAL) ||
((int)vap->va_bytes != VNOVAL) ||
(vap->va_gen != VNOVAL)) {
return (EINVAL);
}
de = vp->v_data;
if (vp->v_type == VDIR)
de = de->de_dir;
error = c = 0;
if (vap->va_uid == (uid_t)VNOVAL)
uid = de->de_uid;
else
uid = vap->va_uid;
if (vap->va_gid == (gid_t)VNOVAL)
gid = de->de_gid;
else
gid = vap->va_gid;
if (uid != de->de_uid || gid != de->de_gid) {
if ((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid ||
(gid != de->de_gid && !groupmember(gid, ap->a_cred))) {
error = priv_check(td, PRIV_VFS_CHOWN);
if (error)
return (error);
}
de->de_uid = uid;
de->de_gid = gid;
c = 1;
}
if (vap->va_mode != (mode_t)VNOVAL) {
if (ap->a_cred->cr_uid != de->de_uid) {
error = priv_check(td, PRIV_VFS_ADMIN);
if (error)
return (error);
}
de->de_mode = vap->va_mode;
c = 1;
}
if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
/* See the comment in ufs_vnops::ufs_setattr(). */
if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, td)) &&
((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
(error = VOP_ACCESS(vp, VWRITE, ap->a_cred, td))))
return (error);
if (vap->va_atime.tv_sec != VNOVAL) {
if (vp->v_type == VCHR)
vp->v_rdev->si_atime = vap->va_atime;
else
de->de_atime = vap->va_atime;
}
if (vap->va_mtime.tv_sec != VNOVAL) {
if (vp->v_type == VCHR)
vp->v_rdev->si_mtime = vap->va_mtime;
else
de->de_mtime = vap->va_mtime;
}
c = 1;
}
if (c) {
if (vp->v_type == VCHR)
vfs_timestamp(&vp->v_rdev->si_ctime);
else
vfs_timestamp(&de->de_mtime);
}
return (0);
}
#ifdef MAC
static int
devfs_setlabel(struct vop_setlabel_args *ap)
{
struct vnode *vp;
struct devfs_dirent *de;
vp = ap->a_vp;
de = vp->v_data;
mac_vnode_relabel(ap->a_cred, vp, ap->a_label);
mac_devfs_update(vp->v_mount, de, vp);
return (0);
}
#endif
static int
devfs_stat_f(struct file *fp, struct stat *sb, struct ucred *cred, struct thread *td)
{
return (vnops.fo_stat(fp, sb, cred, td));
}
static int
devfs_symlink(struct vop_symlink_args *ap)
{
int i, error;
struct devfs_dirent *dd;
struct devfs_dirent *de;
struct devfs_mount *dmp;
error = priv_check(curthread, PRIV_DEVFS_SYMLINK);
if (error)
return(error);
dmp = VFSTODEVFS(ap->a_dvp->v_mount);
dd = ap->a_dvp->v_data;
de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen);
de->de_uid = 0;
de->de_gid = 0;
de->de_mode = 0755;
de->de_inode = alloc_unr(devfs_inos);
de->de_dirent->d_type = DT_LNK;
i = strlen(ap->a_target) + 1;
de->de_symlink = malloc(i, M_DEVFS, M_WAITOK);
bcopy(ap->a_target, de->de_symlink, i);
sx_xlock(&dmp->dm_lock);
#ifdef MAC
mac_devfs_create_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de);
#endif
TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list);
return (devfs_allocv(de, ap->a_dvp->v_mount, ap->a_vpp));
}
static int
devfs_truncate_f(struct file *fp, off_t length, struct ucred *cred, struct thread *td)
{
return (vnops.fo_truncate(fp, length, cred, td));
}
/* ARGSUSED */
static int
devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct thread *td)
{
struct cdev *dev;
int error, ioflag, resid;
struct cdevsw *dsw;
struct file *fpop;
fpop = td->td_fpop;
error = devfs_fp_check(fp, &dev, &dsw);
if (error)
return (error);
KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", uio->uio_td, td));
ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT | O_FSYNC);
if (ioflag & O_DIRECT)
ioflag |= IO_DIRECT;
if ((flags & FOF_OFFSET) == 0)
uio->uio_offset = fp->f_offset;
resid = uio->uio_resid;
error = dsw->d_write(dev, uio, ioflag);
if (uio->uio_resid != resid || (error == 0 && resid != 0)) {
vfs_timestamp(&dev->si_ctime);
dev->si_mtime = dev->si_ctime;
}
td->td_fpop = fpop;
dev_relthread(dev);
if ((flags & FOF_OFFSET) == 0)
fp->f_offset = uio->uio_offset;
fp->f_nextoff = uio->uio_offset;
return (error);
}
dev_t
dev2udev(struct cdev *x)
{
if (x == NULL)
return (NODEV);
return (cdev2priv(x)->cdp_inode);
}
static struct fileops devfs_ops_f = {
.fo_read = devfs_read_f,
.fo_write = devfs_write_f,
.fo_truncate = devfs_truncate_f,
.fo_ioctl = devfs_ioctl_f,
.fo_poll = devfs_poll_f,
.fo_kqfilter = devfs_kqfilter_f,
.fo_stat = devfs_stat_f,
.fo_close = devfs_close_f,
.fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE
};
static struct vop_vector devfs_vnodeops = {
.vop_default = &default_vnodeops,
.vop_access = devfs_access,
.vop_getattr = devfs_getattr,
.vop_ioctl = devfs_rioctl,
.vop_lookup = devfs_lookup,
.vop_mknod = devfs_mknod,
.vop_pathconf = devfs_pathconf,
.vop_read = devfs_rread,
.vop_readdir = devfs_readdir,
.vop_readlink = devfs_readlink,
.vop_reclaim = devfs_reclaim,
.vop_remove = devfs_remove,
.vop_revoke = devfs_revoke,
.vop_setattr = devfs_setattr,
#ifdef MAC
.vop_setlabel = devfs_setlabel,
#endif
.vop_symlink = devfs_symlink,
.vop_vptocnp = devfs_vptocnp,
};
static struct vop_vector devfs_specops = {
.vop_default = &default_vnodeops,
.vop_access = devfs_access,
.vop_bmap = VOP_PANIC,
.vop_close = devfs_close,
.vop_create = VOP_PANIC,
.vop_fsync = devfs_fsync,
.vop_getattr = devfs_getattr,
.vop_link = VOP_PANIC,
.vop_mkdir = VOP_PANIC,
.vop_mknod = VOP_PANIC,
.vop_open = devfs_open,
.vop_pathconf = devfs_pathconf,
.vop_print = devfs_print,
.vop_read = VOP_PANIC,
.vop_readdir = VOP_PANIC,
.vop_readlink = VOP_PANIC,
.vop_reallocblks = VOP_PANIC,
.vop_reclaim = devfs_reclaim,
.vop_remove = devfs_remove,
.vop_rename = VOP_PANIC,
.vop_revoke = devfs_revoke,
.vop_rmdir = VOP_PANIC,
.vop_setattr = devfs_setattr,
#ifdef MAC
.vop_setlabel = devfs_setlabel,
#endif
.vop_strategy = VOP_PANIC,
.vop_symlink = VOP_PANIC,
.vop_vptocnp = devfs_vptocnp,
.vop_write = VOP_PANIC,
};
/*
* Our calling convention to the device drivers used to be that we passed
* vnode.h IO_* flags to read()/write(), but we're moving to fcntl.h O_
* flags instead since that's what open(), close() and ioctl() takes and
* we don't really want vnode.h in device drivers.
* We solved the source compatibility by redefining some vnode flags to
* be the same as the fcntl ones and by sending down the bitwise OR of
* the respective fcntl/vnode flags. These CTASSERTS make sure nobody
* pulls the rug out under this.
*/
CTASSERT(O_NONBLOCK == IO_NDELAY);
CTASSERT(O_FSYNC == IO_SYNC);
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