Exemple #1
0
boolean_t
zfsctl_is_node(vnode_t *vp)
{
	return (vn_matchops(vp, zfsctl_ops_root) ||
	    vn_matchops(vp, zfsctl_ops_snapdir) ||
	    vn_matchops(vp, zfsctl_ops_snapshot) ||
	    vn_matchops(vp, zfsctl_ops_shares_dir));

}
Exemple #2
0
boolean_t
zfsctl_is_node(vnode_t *vp)
{
#if sun
	return (vn_matchops(vp, zfsctl_ops_root) ||
	    vn_matchops(vp, zfsctl_ops_snapdir) ||
	    vn_matchops(vp, zfsctl_ops_snapshot) ||
	    vn_matchops(vp, zfsctl_ops_shares) ||
	    vn_matchops(vp, zfsctl_ops_shares_dir));
#endif
    return 0;
}
Exemple #3
0
static int
auto_link(
	vnode_t *tdvp,
	vnode_t *svp,
	char *nm,
	cred_t *cred,
	caller_context_t *ct,
	int flags)
{
	vnode_t *newvp;
	int error;

	AUTOFS_DPRINT((4, "auto_link tdvp %p svp %p nm %s\n", (void *)tdvp,
	    (void *)svp, nm));

	if (error = auto_trigger_mount(tdvp, cred, &newvp))
		goto done;

	if (newvp == NULL) {
		/*
		 * an autonode can not be a link to another node
		 */
		error = ENOSYS;
		goto done;
	}

	if (vn_is_readonly(newvp)) {
		error = EROFS;
		VN_RELE(newvp);
		goto done;
	}

	if (vn_matchops(svp, auto_vnodeops)) {
		/*
		 * source vp can't be an autonode
		 */
		error = ENOSYS;
		VN_RELE(newvp);
		goto done;
	}

	error = VOP_LINK(newvp, svp, nm, cred, ct, flags);
	VN_RELE(newvp);

done:
	AUTOFS_DPRINT((5, "auto_link error=%d\n", error));
	return (error);
}
Exemple #4
0
static void
fnode_destructor(void *buf, void *cdrarg)
{
	fifodata_t *fdp = buf;
	fifolock_t *flp = &fdp->fifo_lock;
	fifonode_t *fnp = &fdp->fifo_fnode[0];
	size_t size = (uintptr_t)cdrarg;

	mutex_destroy(&flp->flk_lock);
	cv_destroy(&flp->flk_wait_cv);
	ASSERT(flp->flk_ocsync == 0);

	while ((char *)fnp < (char *)buf + size) {

		vnode_t *vp = FTOV(fnp);

		if (vp == NULL) {
			return; /* constructor failed here */
		}

		ASSERT(fnp->fn_mp == NULL);
		ASSERT(fnp->fn_count == 0);
		ASSERT(fnp->fn_lock == flp);
		ASSERT(fnp->fn_open == 0);
		ASSERT(fnp->fn_insync == 0);
		ASSERT(fnp->fn_rsynccnt == 0 && fnp->fn_wsynccnt == 0);
		ASSERT(fnp->fn_wwaitcnt == 0);
		ASSERT(fnp->fn_pcredp == NULL);
		ASSERT(vn_matchops(vp, fifo_vnodeops));
		ASSERT(vp->v_stream == NULL);
		ASSERT(vp->v_type == VFIFO);
		ASSERT(vp->v_data == (caddr_t)fnp);
		ASSERT((vp->v_flag & (VNOMAP|VNOSWAP)) == (VNOMAP|VNOSWAP));

		cv_destroy(&fnp->fn_wait_cv);
		vn_invalid(vp);
		vn_free(vp);

		fnp++;
	}
}
Exemple #5
0
/*
 * wput(9E) is symmetric for master and slave sides, so this handles both
 * without splitting the codepath.  (The only exception to this is the
 * processing of zcons ioctls, which is restricted to the master side.)
 *
 * zc_wput() looks at the other side; if there is no process holding that
 * side open, it frees the message.  This prevents processes from hanging
 * if no one is holding open the console.  Otherwise, it putnext's high
 * priority messages, putnext's normal messages if possible, and otherwise
 * enqueues the messages; in the case that something is enqueued, wsrv(9E)
 * will take care of eventually shuttling I/O to the other side.
 */
static void
zc_wput(queue_t *qp, mblk_t *mp)
{
	unsigned char type = mp->b_datap->db_type;
	zc_state_t *zcs;
	struct iocblk *iocbp;
	file_t *slave_filep;
	struct snode *slave_snodep;
	int slave_fd;

	ASSERT(qp->q_ptr);

	DBG1("entering zc_wput, %s side", zc_side(qp));

	/*
	 * Process zcons ioctl messages if qp is the master console's write
	 * queue.
	 */
	zcs = (zc_state_t *)qp->q_ptr;
	if (zcs->zc_master_rdq != NULL && qp == WR(zcs->zc_master_rdq) &&
	    type == M_IOCTL) {
		iocbp = (struct iocblk *)(void *)mp->b_rptr;
		switch (iocbp->ioc_cmd) {
		case ZC_HOLDSLAVE:
			/*
			 * Hold the slave's vnode and increment the refcount
			 * of the snode.  If the vnode is already held, then
			 * indicate success.
			 */
			if (iocbp->ioc_count != TRANSPARENT) {
				miocack(qp, mp, 0, EINVAL);
				return;
			}
			if (zcs->zc_slave_vnode != NULL) {
				miocack(qp, mp, 0, 0);
				return;
			}

			/*
			 * The process that passed the ioctl must be running in
			 * the global zone.
			 */
			if (curzone != global_zone) {
				miocack(qp, mp, 0, EINVAL);
				return;
			}

			/*
			 * The calling process must pass a file descriptor for
			 * the slave device.
			 */
			slave_fd =
			    (int)(intptr_t)*(caddr_t *)(void *)mp->b_cont->
			    b_rptr;
			slave_filep = getf(slave_fd);
			if (slave_filep == NULL) {
				miocack(qp, mp, 0, EINVAL);
				return;
			}
			if (ZC_STATE_TO_SLAVEDEV(zcs) !=
			    slave_filep->f_vnode->v_rdev) {
				releasef(slave_fd);
				miocack(qp, mp, 0, EINVAL);
				return;
			}

			/*
			 * Get a reference to the slave's vnode.  Also bump the
			 * reference count on the associated snode.
			 */
			ASSERT(vn_matchops(slave_filep->f_vnode,
			    spec_getvnodeops()));
			zcs->zc_slave_vnode = slave_filep->f_vnode;
			VN_HOLD(zcs->zc_slave_vnode);
			slave_snodep = VTOCS(zcs->zc_slave_vnode);
			mutex_enter(&slave_snodep->s_lock);
			++slave_snodep->s_count;
			mutex_exit(&slave_snodep->s_lock);
			releasef(slave_fd);
			miocack(qp, mp, 0, 0);
			return;
		case ZC_RELEASESLAVE:
			/*
			 * Release the master's handle on the slave's vnode.
			 * If there isn't a handle for the vnode, then indicate
			 * success.
			 */
			if (iocbp->ioc_count != TRANSPARENT) {
				miocack(qp, mp, 0, EINVAL);
				return;
			}
			if (zcs->zc_slave_vnode == NULL) {
				miocack(qp, mp, 0, 0);
				return;
			}

			/*
			 * The process that passed the ioctl must be running in
			 * the global zone.
			 */
			if (curzone != global_zone) {
				miocack(qp, mp, 0, EINVAL);
				return;
			}

			/*
			 * The process that passed the ioctl must have provided
			 * a file descriptor for the slave device.  Make sure
			 * this is correct.
			 */
			slave_fd =
			    (int)(intptr_t)*(caddr_t *)(void *)mp->b_cont->
			    b_rptr;
			slave_filep = getf(slave_fd);
			if (slave_filep == NULL) {
				miocack(qp, mp, 0, EINVAL);
				return;
			}
			if (zcs->zc_slave_vnode->v_rdev !=
			    slave_filep->f_vnode->v_rdev) {
				releasef(slave_fd);
				miocack(qp, mp, 0, EINVAL);
				return;
			}

			/*
			 * Decrement the snode's reference count and release the
			 * vnode.
			 */
			ASSERT(vn_matchops(slave_filep->f_vnode,
			    spec_getvnodeops()));
			slave_snodep = VTOCS(zcs->zc_slave_vnode);
			mutex_enter(&slave_snodep->s_lock);
			--slave_snodep->s_count;
			mutex_exit(&slave_snodep->s_lock);
			VN_RELE(zcs->zc_slave_vnode);
			zcs->zc_slave_vnode = NULL;
			releasef(slave_fd);
			miocack(qp, mp, 0, 0);
			return;
		default:
			break;
		}
	}

	if (zc_switch(RD(qp)) == NULL) {
		DBG1("wput to %s side (no one listening)", zc_side(qp));
		switch (type) {
		case M_FLUSH:
			handle_mflush(qp, mp);
			break;
		case M_IOCTL:
			miocnak(qp, mp, 0, 0);
			break;
		default:
			freemsg(mp);
			break;
		}
		return;
	}

	if (type >= QPCTL) {
		DBG1("(hipri) wput, %s side", zc_side(qp));
		switch (type) {
		case M_READ:		/* supposedly from ldterm? */
			DBG("zc_wput: tossing M_READ\n");
			freemsg(mp);
			break;
		case M_FLUSH:
			handle_mflush(qp, mp);
			break;
		default:
			/*
			 * Put this to the other side.
			 */
			ASSERT(zc_switch(RD(qp)) != NULL);
			putnext(zc_switch(RD(qp)), mp);
			break;
		}
		DBG1("done (hipri) wput, %s side", zc_side(qp));
		return;
	}

	/*
	 * Only putnext if there isn't already something in the queue.
	 * otherwise things would wind up out of order.
	 */
	if (qp->q_first == NULL && bcanputnext(RD(zc_switch(qp)), mp->b_band)) {
		DBG("wput: putting message to other side\n");
		putnext(RD(zc_switch(qp)), mp);
	} else {
		DBG("wput: putting msg onto queue\n");
		(void) putq(qp, mp);
	}
	DBG1("done wput, %s side", zc_side(qp));
}
Exemple #6
0
static int
auto_rename(
	vnode_t *odvp,
	char *onm,
	vnode_t *ndvp,
	char *nnm,
	cred_t *cr,
	caller_context_t *ct,
	int flags)
{
	vnode_t *o_newvp, *n_newvp;
	int error;

	AUTOFS_DPRINT((4, "auto_rename odvp %p onm %s to ndvp %p nnm %s\n",
	    (void *)odvp, onm, (void *)ndvp, nnm));

	/*
	 * we know odvp is an autonode, otherwise this function
	 * could not have ever been called.
	 */
	ASSERT(vn_matchops(odvp, auto_vnodeops));

	if (error = auto_trigger_mount(odvp, cr, &o_newvp))
		goto done;

	if (o_newvp == NULL) {
		/*
		 * can't rename an autonode
		 */
		error = ENOSYS;
		goto done;
	}

	if (vn_matchops(ndvp, auto_vnodeops)) {
		/*
		 * directory is AUTOFS, need to trigger the
		 * mount of the real filesystem.
		 */
		if (error = auto_trigger_mount(ndvp, cr, &n_newvp)) {
			VN_RELE(o_newvp);
			goto done;
		}

		if (n_newvp == NULL) {
			/*
			 * target can't be an autonode
			 */
			error = ENOSYS;
			VN_RELE(o_newvp);
			goto done;
		}
	} else {
		/*
		 * destination directory mount had been
		 * triggered prior to the call to this function.
		 */
		n_newvp = ndvp;
	}

	ASSERT(!vn_matchops(n_newvp, auto_vnodeops));

	if (vn_is_readonly(n_newvp)) {
		error = EROFS;
		VN_RELE(o_newvp);
		if (n_newvp != ndvp)
			VN_RELE(n_newvp);
		goto done;
	}

	error = VOP_RENAME(o_newvp, onm, n_newvp, nnm, cr, ct, flags);
	VN_RELE(o_newvp);
	if (n_newvp != ndvp)
		VN_RELE(n_newvp);

done:
	AUTOFS_DPRINT((5, "auto_rename error=%d\n", error));
	return (error);
}
Exemple #7
0
static int
auto_lookup(
	vnode_t *dvp,
	char *nm,
	vnode_t **vpp,
	pathname_t *pnp,
	int flags,
	vnode_t *rdir,
	cred_t *cred,
	caller_context_t *ct,
	int *direntflags,
	pathname_t *realpnp)
{
	int error = 0;
	vnode_t *newvp = NULL;
	vfs_t *vfsp;
	fninfo_t *dfnip;
	fnnode_t *dfnp = NULL;
	fnnode_t *fnp = NULL;
	char *searchnm;
	int operation;		/* either AUTOFS_LOOKUP or AUTOFS_MOUNT */

	dfnip = vfstofni(dvp->v_vfsp);
	AUTOFS_DPRINT((3, "auto_lookup: dvp=%p (%s) name=%s\n",
	    (void *)dvp, dfnip->fi_map, nm));

	if (nm[0] == 0) {
		VN_HOLD(dvp);
		*vpp = dvp;
		return (0);
	}

	if (error = VOP_ACCESS(dvp, VEXEC, 0, cred, ct))
		return (error);

	if (nm[0] == '.' && nm[1] == 0) {
		VN_HOLD(dvp);
		*vpp = dvp;
		return (0);
	}

	if (nm[0] == '.' && nm[1] == '.' && nm[2] == 0) {
		fnnode_t *pdfnp;

		pdfnp = (vntofn(dvp))->fn_parent;
		ASSERT(pdfnp != NULL);

		/*
		 * Since it is legitimate to have the VROOT flag set for the
		 * subdirectories of the indirect map in autofs filesystem,
		 * rootfnnodep is checked against fnnode of dvp instead of
		 * just checking whether VROOT flag is set in dvp
		 */

		if (pdfnp == pdfnp->fn_globals->fng_rootfnnodep) {
			vnode_t *vp;

			vfs_rlock_wait(dvp->v_vfsp);
			if (dvp->v_vfsp->vfs_flag & VFS_UNMOUNTED) {
				vfs_unlock(dvp->v_vfsp);
				return (EIO);
			}
			vp = dvp->v_vfsp->vfs_vnodecovered;
			VN_HOLD(vp);
			vfs_unlock(dvp->v_vfsp);
			error = VOP_LOOKUP(vp, nm, vpp, pnp, flags, rdir, cred,
			    ct, direntflags, realpnp);
			VN_RELE(vp);
			return (error);
		} else {
			*vpp = fntovn(pdfnp);
			VN_HOLD(*vpp);
			return (0);
		}
	}

top:
	dfnp = vntofn(dvp);
	searchnm = nm;
	operation = 0;

	ASSERT(vn_matchops(dvp, auto_vnodeops));

	AUTOFS_DPRINT((3, "auto_lookup: dvp=%p dfnp=%p\n", (void *)dvp,
	    (void *)dfnp));

	/*
	 * If a lookup or mount of this node is in progress, wait for it
	 * to finish, and return whatever result it got.
	 */
	mutex_enter(&dfnp->fn_lock);
	if (dfnp->fn_flags & (MF_LOOKUP | MF_INPROG)) {
		mutex_exit(&dfnp->fn_lock);
		error = auto_wait4mount(dfnp);
		if (error == AUTOFS_SHUTDOWN)
			error = ENOENT;
		if (error == EAGAIN)
			goto top;
		if (error)
			return (error);
	} else
		mutex_exit(&dfnp->fn_lock);


	error = vn_vfsrlock_wait(dvp);
	if (error)
		return (error);
	vfsp = vn_mountedvfs(dvp);
	if (vfsp != NULL) {
		error = VFS_ROOT(vfsp, &newvp);
		vn_vfsunlock(dvp);
		if (!error) {
			error = VOP_LOOKUP(newvp, nm, vpp, pnp,
			    flags, rdir, cred, ct, direntflags, realpnp);
			VN_RELE(newvp);
		}
		return (error);
	}
	vn_vfsunlock(dvp);

	rw_enter(&dfnp->fn_rwlock, RW_READER);
	error = auto_search(dfnp, nm, &fnp, cred);
	if (error) {
		if (dfnip->fi_flags & MF_DIRECT) {
			/*
			 * direct map.
			 */
			if (dfnp->fn_dirents) {
				/*
				 * Mount previously triggered.
				 * 'nm' not found
				 */
				error = ENOENT;
			} else {
				/*
				 * I need to contact the daemon to trigger
				 * the mount. 'dfnp' will be the mountpoint.
				 */
				operation = AUTOFS_MOUNT;
				VN_HOLD(fntovn(dfnp));
				fnp = dfnp;
				error = 0;
			}
		} else if (dvp == dfnip->fi_rootvp) {
			/*
			 * 'dfnp' is the root of the indirect AUTOFS.
			 */
			if (rw_tryupgrade(&dfnp->fn_rwlock) == 0) {
				/*
				 * Could not acquire writer lock, release
				 * reader, and wait until available. We
				 * need to search for 'nm' again, since we
				 * had to release the lock before reacquiring
				 * it.
				 */
				rw_exit(&dfnp->fn_rwlock);
				rw_enter(&dfnp->fn_rwlock, RW_WRITER);
				error = auto_search(dfnp, nm, &fnp, cred);
			}

			ASSERT(RW_WRITE_HELD(&dfnp->fn_rwlock));
			if (error) {
				/*
				 * create node being looked-up and request
				 * mount on it.
				 */
				error = auto_enter(dfnp, nm, &fnp, kcred);
				if (!error)
					operation = AUTOFS_LOOKUP;
			}
		} else if ((dfnp->fn_dirents == NULL) &&
		    ((dvp->v_flag & VROOT) == 0) &&
		    ((fntovn(dfnp->fn_parent))->v_flag & VROOT)) {
			/*
			 * dfnp is the actual 'mountpoint' of indirect map,
			 * it is the equivalent of a direct mount,
			 * ie, /home/'user1'
			 */
			operation = AUTOFS_MOUNT;
			VN_HOLD(fntovn(dfnp));
			fnp = dfnp;
			error = 0;
			searchnm = dfnp->fn_name;
		}
	}

	if (error == EAGAIN) {
		rw_exit(&dfnp->fn_rwlock);
		goto top;
	}
	if (error) {
		rw_exit(&dfnp->fn_rwlock);
		return (error);
	}

	/*
	 * We now have the actual fnnode we're interested in.
	 * The 'MF_LOOKUP' indicates another thread is currently
	 * performing a daemon lookup of this node, therefore we
	 * wait for its completion.
	 * The 'MF_INPROG' indicates another thread is currently
	 * performing a daemon mount of this node, we wait for it
	 * to be done if we are performing a MOUNT. We don't
	 * wait for it if we are performing a LOOKUP.
	 * We can release the reader/writer lock as soon as we acquire
	 * the mutex, since the state of the lock can only change by
	 * first acquiring the mutex.
	 */
	mutex_enter(&fnp->fn_lock);
	rw_exit(&dfnp->fn_rwlock);
	if ((fnp->fn_flags & MF_LOOKUP) ||
	    ((operation == AUTOFS_MOUNT) && (fnp->fn_flags & MF_INPROG))) {
		mutex_exit(&fnp->fn_lock);
		error = auto_wait4mount(fnp);
		VN_RELE(fntovn(fnp));
		if (error == AUTOFS_SHUTDOWN)
			error = ENOENT;
		if (error && error != EAGAIN)
			return (error);
		goto top;
	}

	if (operation == 0) {
		/*
		 * got the fnnode, check for any errors
		 * on the previous operation on that node.
		 */
		error = fnp->fn_error;
		if ((error == EINTR) || (error == EAGAIN)) {
			/*
			 * previous operation on this node was
			 * not completed, do a lookup now.
			 */
			operation = AUTOFS_LOOKUP;
		} else {
			/*
			 * previous operation completed. Return
			 * a pointer to the node only if there was
			 * no error.
			 */
			mutex_exit(&fnp->fn_lock);
			if (!error)
				*vpp = fntovn(fnp);
			else
				VN_RELE(fntovn(fnp));
			return (error);
		}
	}

	/*
	 * Since I got to this point, it means I'm the one
	 * responsible for triggering the mount/look-up of this node.
	 */
	switch (operation) {
	case AUTOFS_LOOKUP:
		AUTOFS_BLOCK_OTHERS(fnp, MF_LOOKUP);
		fnp->fn_error = 0;
		mutex_exit(&fnp->fn_lock);
		error = auto_lookup_aux(fnp, searchnm, cred);
		if (!error) {
			/*
			 * Return this vnode
			 */
			*vpp = fntovn(fnp);
		} else {
			/*
			 * release our reference to this vnode
			 * and return error
			 */
			VN_RELE(fntovn(fnp));
		}
		break;
	case AUTOFS_MOUNT:
		AUTOFS_BLOCK_OTHERS(fnp, MF_INPROG);
		fnp->fn_error = 0;
		mutex_exit(&fnp->fn_lock);
		/*
		 * auto_new_mount_thread fires up a new thread which
		 * calls automountd finishing up the work
		 */
		auto_new_mount_thread(fnp, searchnm, cred);

		/*
		 * At this point, we are simply another thread
		 * waiting for the mount to complete
		 */
		error = auto_wait4mount(fnp);
		if (error == AUTOFS_SHUTDOWN)
			error = ENOENT;

		/*
		 * now release our reference to this vnode
		 */
		VN_RELE(fntovn(fnp));
		if (!error)
			goto top;
		break;
	default:
		auto_log(dfnp->fn_globals->fng_verbose,
		    dfnp->fn_globals->fng_zoneid, CE_WARN,
		    "auto_lookup: unknown operation %d",
		    operation);
	}

	AUTOFS_DPRINT((5, "auto_lookup: name=%s *vpp=%p return=%d\n",
	    nm, (void *)*vpp, error));

	return (error);
}
/*
 * Mount a file descriptor onto the node in the file system.
 * Create a new vnode, update the attributes with info from the
 * file descriptor and the mount point.  The mask, mode, uid, gid,
 * atime, mtime and ctime are taken from the mountpt.  Link count is
 * set to one, the file system id is namedev and nodeid is unique
 * for each mounted object.  Other attributes are taken from mount point.
 * Make sure user is owner (or root) with write permissions on mount point.
 * Hash the new vnode and return 0.
 * Upon entry to this routine, the file descriptor is in the
 * fd field of a struct namefd.  Copy that structure from user
 * space and retrieve the file descriptor.
 */
static int
nm_mount(vfs_t *vfsp, vnode_t *mvp, struct mounta *uap, cred_t *crp)
{
	struct namefd namefdp;
	struct vnode *filevp;		/* file descriptor vnode */
	struct file *fp;
	struct vnode *newvp;		/* vnode representing this mount */
	struct vnode *rvp;		/* realvp (if any) for the mountpt */
	struct namenode *nodep;		/* namenode for this mount */
	struct vattr filevattr;		/* attributes of file dec.  */
	struct vattr *vattrp;		/* attributes of this mount */
	char *resource_name;
	char *resource_nodetype;
	statvfs64_t *svfsp;
	int error = 0;

	/*
	 * Get the file descriptor from user space.
	 * Make sure the file descriptor is valid and has an
	 * associated file pointer.
	 * If so, extract the vnode from the file pointer.
	 */
	if (uap->datalen != sizeof (struct namefd))
		return (EINVAL);

	if (copyin(uap->dataptr, &namefdp, uap->datalen))
		return (EFAULT);

	if ((fp = getf(namefdp.fd)) == NULL)
		return (EBADF);

	/*
	 * If the mount point already has something mounted
	 * on it, disallow this mount.  (This restriction may
	 * be removed in a later release).
	 * Or unmount has completed but the namefs ROOT vnode
	 * count has not decremented to zero, disallow this mount.
	 */

	mutex_enter(&mvp->v_lock);
	if ((mvp->v_flag & VROOT) ||
	    vfs_matchops(mvp->v_vfsp, namefs_vfsops)) {
		mutex_exit(&mvp->v_lock);
		releasef(namefdp.fd);
		return (EBUSY);
	}
	mutex_exit(&mvp->v_lock);

	/*
	 * Cannot allow users to fattach() in /dev/pts.
	 * First, there is no need for doing so and secondly
	 * we cannot allow arbitrary users to park on a node in
	 * /dev/pts or /dev/vt.
	 */
	rvp = NULLVP;
	if (vn_matchops(mvp, spec_getvnodeops()) &&
	    VOP_REALVP(mvp, &rvp, NULL) == 0 && rvp &&
	    (vn_matchops(rvp, devpts_getvnodeops()) ||
	    vn_matchops(rvp, devvt_getvnodeops()))) {
		releasef(namefdp.fd);
		return (ENOTSUP);
	}

	filevp = fp->f_vnode;
	if (filevp->v_type == VDIR || filevp->v_type == VPORT) {
		releasef(namefdp.fd);
		return (EINVAL);
	}

	/*
	 * If the fd being mounted refers to neither a door nor a stream,
	 * make sure the caller is privileged.
	 */
	if (filevp->v_type != VDOOR && filevp->v_stream == NULL) {
		if (secpolicy_fs_mount(crp, filevp, vfsp) != 0) {
			/* fd is neither a stream nor a door */
			releasef(namefdp.fd);
			return (EINVAL);
		}
	}

	/*
	 * Make sure the file descriptor is not the root of some
	 * file system.
	 * If it's not, create a reference and allocate a namenode
	 * to represent this mount request.
	 */
	if (filevp->v_flag & VROOT) {
		releasef(namefdp.fd);
		return (EBUSY);
	}

	nodep = kmem_zalloc(sizeof (struct namenode), KM_SLEEP);

	mutex_init(&nodep->nm_lock, NULL, MUTEX_DEFAULT, NULL);
	vattrp = &nodep->nm_vattr;
	vattrp->va_mask = AT_ALL;
	if (error = VOP_GETATTR(mvp, vattrp, 0, crp, NULL))
		goto out;

	filevattr.va_mask = AT_ALL;
	if (error = VOP_GETATTR(filevp, &filevattr, 0, crp, NULL))
		goto out;
	/*
	 * Make sure the user is the owner of the mount point
	 * or has sufficient privileges.
	 */
	if (error = secpolicy_vnode_owner(crp, vattrp->va_uid))
		goto out;

	/*
	 * Make sure the user has write permissions on the
	 * mount point (or has sufficient privileges).
	 */
	if (!(vattrp->va_mode & VWRITE) &&
	    secpolicy_vnode_access(crp, mvp, vattrp->va_uid, VWRITE) != 0) {
		error = EACCES;
		goto out;
	}

	/*
	 * If the file descriptor has file/record locking, don't
	 * allow the mount to succeed.
	 */
	if (vn_has_flocks(filevp)) {
		error = EACCES;
		goto out;
	}

	/*
	 * Initialize the namenode.
	 */
	if (filevp->v_stream) {
		struct stdata *stp = filevp->v_stream;
		mutex_enter(&stp->sd_lock);
		stp->sd_flag |= STRMOUNT;
		mutex_exit(&stp->sd_lock);
	}
	nodep->nm_filevp = filevp;
	mutex_enter(&fp->f_tlock);
	fp->f_count++;
	mutex_exit(&fp->f_tlock);

	releasef(namefdp.fd);
	nodep->nm_filep = fp;
	nodep->nm_mountpt = mvp;

	/*
	 * The attributes for the mounted file descriptor were initialized
	 * above by applying VOP_GETATTR to the mount point.  Some of
	 * the fields of the attributes structure will be overwritten
	 * by the attributes from the file descriptor.
	 */
	vattrp->va_type    = filevattr.va_type;
	vattrp->va_fsid    = namedev;
	vattrp->va_nodeid  = namenodeno_alloc();
	vattrp->va_nlink   = 1;
	vattrp->va_size    = filevattr.va_size;
	vattrp->va_rdev    = filevattr.va_rdev;
	vattrp->va_blksize = filevattr.va_blksize;
	vattrp->va_nblocks = filevattr.va_nblocks;
	vattrp->va_seq	   = 0;

	/*
	 * Initialize new vnode structure for the mounted file descriptor.
	 */
	nodep->nm_vnode = vn_alloc(KM_SLEEP);
	newvp = NMTOV(nodep);

	newvp->v_flag = filevp->v_flag | VROOT | VNOMAP | VNOSWAP;
	vn_setops(newvp, nm_vnodeops);
	newvp->v_vfsp = vfsp;
	newvp->v_stream = filevp->v_stream;
	newvp->v_type = filevp->v_type;
	newvp->v_rdev = filevp->v_rdev;
	newvp->v_data = (caddr_t)nodep;
	VFS_HOLD(vfsp);
	vn_exists(newvp);

	/*
	 * Initialize the vfs structure.
	 */
	vfsp->vfs_vnodecovered = NULL;
	vfsp->vfs_flag |= VFS_UNLINKABLE;
	vfsp->vfs_bsize = 1024;
	vfsp->vfs_fstype = namefstype;
	vfs_make_fsid(&vfsp->vfs_fsid, namedev, namefstype);
	vfsp->vfs_data = (caddr_t)nodep;
	vfsp->vfs_dev = namedev;
	vfsp->vfs_bcount = 0;

	/*
	 * Set the name we mounted from.
	 */
	switch (filevp->v_type) {
	case VPROC:	/* VOP_GETATTR() translates this to VREG */
	case VREG:	resource_nodetype = "file"; break;
	case VDIR:	resource_nodetype = "directory"; break;
	case VBLK:	resource_nodetype = "device"; break;
	case VCHR:	resource_nodetype = "device"; break;
	case VLNK:	resource_nodetype = "link"; break;
	case VFIFO:	resource_nodetype = "fifo"; break;
	case VDOOR:	resource_nodetype = "door"; break;
	case VSOCK:	resource_nodetype = "socket"; break;
	default:	resource_nodetype = "resource"; break;
	}

#define	RESOURCE_NAME_SZ 128 /* Maximum length of the resource name */
	resource_name = kmem_alloc(RESOURCE_NAME_SZ, KM_SLEEP);
	svfsp = kmem_alloc(sizeof (statvfs64_t), KM_SLEEP);

	error = VFS_STATVFS(filevp->v_vfsp, svfsp);
	if (error == 0) {
		(void) snprintf(resource_name, RESOURCE_NAME_SZ,
		    "unspecified_%s_%s", svfsp->f_basetype, resource_nodetype);
	} else {
		(void) snprintf(resource_name, RESOURCE_NAME_SZ,
		    "unspecified_%s", resource_nodetype);
	}

	vfs_setresource(vfsp, resource_name);

	kmem_free(svfsp, sizeof (statvfs64_t));
	kmem_free(resource_name, RESOURCE_NAME_SZ);
#undef RESOURCE_NAME_SZ

	/*
	 * Insert the namenode.
	 */
	mutex_enter(&ntable_lock);
	nameinsert(nodep);
	mutex_exit(&ntable_lock);
	return (0);
out:
	releasef(namefdp.fd);
	kmem_free(nodep, sizeof (struct namenode));
	return (error);
}