Home | History | Annotate | Download | only in syscall
      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License, Version 1.0 only
      6  * (the "License").  You may not use this file except in compliance
      7  * with the License.
      8  *
      9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
     10  * or http://www.opensolaris.org/os/licensing.
     11  * See the License for the specific language governing permissions
     12  * and limitations under the License.
     13  *
     14  * When distributing Covered Code, include this CDDL HEADER in each
     15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     16  * If applicable, add the following below this CDDL HEADER, with the
     17  * fields enclosed by brackets "[]" replaced with your own identifying
     18  * information: Portions Copyright [yyyy] [name of copyright owner]
     19  *
     20  * CDDL HEADER END
     21  */
     22 /*
     23  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 /*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
     28 /*	  All Rights Reserved  	*/
     29 
     30 /*
     31  * Portions of this source code were derived from Berkeley 4.3 BSD
     32  * under license from the Regents of the University of California.
     33  */
     34 
     35 #pragma ident	"@(#)mount.c	1.18	05/06/08 SMI"
     36 
     37 #include <sys/types.h>
     38 #include <sys/t_lock.h>
     39 #include <sys/param.h>
     40 #include <sys/errno.h>
     41 #include <sys/user.h>
     42 #include <sys/fstyp.h>
     43 #include <sys/kmem.h>
     44 #include <sys/systm.h>
     45 #include <sys/mount.h>
     46 #include <sys/vfs.h>
     47 #include <sys/cred.h>
     48 #include <sys/vnode.h>
     49 #include <sys/dnlc.h>
     50 #include <sys/file.h>
     51 #include <sys/time.h>
     52 #include <sys/cmn_err.h>
     53 #include <sys/swap.h>
     54 #include <sys/debug.h>
     55 #include <sys/pathname.h>
     56 #include <sys/cladm.h>
     57 
     58 /*
     59  * System calls.
     60  */
     61 
     62 /*
     63  * "struct mounta" defined in sys/vfs.h.
     64  */
     65 
     66 /* ARGSUSED */
     67 int
     68 mount(long *lp, rval_t *rp)
     69 {
     70 	vnode_t *vp = NULL;
     71 	struct vfs *vfsp;	/* dummy argument */
     72 	int error;
     73 	struct mounta *uap;
     74 #if defined(_LP64)
     75 	struct mounta native;
     76 
     77 	/*
     78 	 * Make a struct mounta if we are DATAMODEL_LP64
     79 	 */
     80 	uap = &native;
     81 	uap->spec = (char *)*lp++;
     82 	uap->dir = (char *)*lp++;
     83 	uap->flags = (int)*lp++;
     84 	uap->fstype = (char *)*lp++;
     85 	uap->dataptr = (char *)*lp++;
     86 	uap->datalen = (int)*lp++;
     87 	uap->optptr = (char *)*lp++;
     88 	uap->optlen = (int)*lp++;
     89 #else	/* !defined(_LP64) */
     90 	/*
     91 	 * 32 bit kernels can take a shortcut and just cast
     92 	 * the args array to the structure.
     93 	 */
     94 	uap = (struct mounta *)lp;
     95 #endif	/* _LP64 */
     96 	/*
     97 	 * Resolve second path name (mount point).
     98 	 */
     99 	if (error = lookupname(uap->dir, UIO_USERSPACE, FOLLOW, NULLVPP, &vp))
    100 		return (set_errno(error));
    101 
    102 	/*
    103 	 * Some mount flags are disallowed through the system call interface.
    104 	 */
    105 	uap->flags &= MS_MASK;
    106 
    107 	if ((vp->v_flag & VPXFS) && ((uap->flags & MS_GLOBAL) != MS_GLOBAL)) {
    108 		/*
    109 		 * Clustering: if we're doing a mount onto the global
    110 		 * namespace, and the mount is not a global mount, return
    111 		 * an error.
    112 		 */
    113 		error = ENOTSUP;
    114 	} else if (uap->flags & MS_GLOBAL) {
    115 		/*
    116 		 * Clustering: global mount specified.
    117 		 */
    118 		if ((cluster_bootflags & CLUSTER_BOOTED) == 0) {
    119 			/*
    120 			 * If we're not booted as a cluster,
    121 			 * global mounts are not allowed.
    122 			 */
    123 			error = ENOTSUP;
    124 		} else {
    125 			error = domount("pxfs", uap, vp, CRED(), &vfsp);
    126 			if (!error)
    127 				VFS_RELE(vfsp);
    128 		}
    129 	} else {
    130 		error = domount(NULL, uap, vp, CRED(), &vfsp);
    131 		if (!error)
    132 			VFS_RELE(vfsp);
    133 	}
    134 	VN_RELE(vp);
    135 	rp->r_val2 = error;
    136 	return (error ? set_errno(error) : 0);
    137 }
    138