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 "%Z%%M% %I% %E% 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
mount(long * lp,rval_t * rp)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