xref: /illumos-gate/usr/src/uts/common/syscall/statfs.c (revision 7c478bd9)
1*7c478bd9Sstevel@tonic-gate /*
2*7c478bd9Sstevel@tonic-gate  * CDDL HEADER START
3*7c478bd9Sstevel@tonic-gate  *
4*7c478bd9Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5*7c478bd9Sstevel@tonic-gate  * Common Development and Distribution License, Version 1.0 only
6*7c478bd9Sstevel@tonic-gate  * (the "License").  You may not use this file except in compliance
7*7c478bd9Sstevel@tonic-gate  * with the License.
8*7c478bd9Sstevel@tonic-gate  *
9*7c478bd9Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*7c478bd9Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
11*7c478bd9Sstevel@tonic-gate  * See the License for the specific language governing permissions
12*7c478bd9Sstevel@tonic-gate  * and limitations under the License.
13*7c478bd9Sstevel@tonic-gate  *
14*7c478bd9Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
15*7c478bd9Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*7c478bd9Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
17*7c478bd9Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
18*7c478bd9Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
19*7c478bd9Sstevel@tonic-gate  *
20*7c478bd9Sstevel@tonic-gate  * CDDL HEADER END
21*7c478bd9Sstevel@tonic-gate  */
22*7c478bd9Sstevel@tonic-gate /*
23*7c478bd9Sstevel@tonic-gate  * Copyright 2001 Sun Microsystems, Inc.  All rights reserved.
24*7c478bd9Sstevel@tonic-gate  * Use is subject to license terms.
25*7c478bd9Sstevel@tonic-gate  */
26*7c478bd9Sstevel@tonic-gate 
27*7c478bd9Sstevel@tonic-gate /*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
28*7c478bd9Sstevel@tonic-gate /*	  All Rights Reserved  	*/
29*7c478bd9Sstevel@tonic-gate 
30*7c478bd9Sstevel@tonic-gate /*
31*7c478bd9Sstevel@tonic-gate  * Portions of this source code were derived from Berkeley 4.3 BSD
32*7c478bd9Sstevel@tonic-gate  * under license from the Regents of the University of California.
33*7c478bd9Sstevel@tonic-gate  */
34*7c478bd9Sstevel@tonic-gate 
35*7c478bd9Sstevel@tonic-gate #pragma ident	"%Z%%M%	%I%	%E% SMI"
36*7c478bd9Sstevel@tonic-gate 
37*7c478bd9Sstevel@tonic-gate #include <sys/inttypes.h>
38*7c478bd9Sstevel@tonic-gate #include <sys/types.h>
39*7c478bd9Sstevel@tonic-gate #include <sys/t_lock.h>
40*7c478bd9Sstevel@tonic-gate #include <sys/param.h>
41*7c478bd9Sstevel@tonic-gate #include <sys/errno.h>
42*7c478bd9Sstevel@tonic-gate #include <sys/fstyp.h>
43*7c478bd9Sstevel@tonic-gate #include <sys/systm.h>
44*7c478bd9Sstevel@tonic-gate #include <sys/vfs.h>
45*7c478bd9Sstevel@tonic-gate #include <sys/statfs.h>
46*7c478bd9Sstevel@tonic-gate #include <sys/vnode.h>
47*7c478bd9Sstevel@tonic-gate #include <sys/file.h>
48*7c478bd9Sstevel@tonic-gate #include <sys/cmn_err.h>
49*7c478bd9Sstevel@tonic-gate #include <sys/debug.h>
50*7c478bd9Sstevel@tonic-gate #include <sys/pathname.h>
51*7c478bd9Sstevel@tonic-gate 
52*7c478bd9Sstevel@tonic-gate #include <vm/page.h>
53*7c478bd9Sstevel@tonic-gate 
54*7c478bd9Sstevel@tonic-gate #if defined(_SYSCALL32_IMPL) || defined(_ILP32)
55*7c478bd9Sstevel@tonic-gate 
56*7c478bd9Sstevel@tonic-gate /*
57*7c478bd9Sstevel@tonic-gate  * statfs(2) and fstatfs(2) have been replaced by statvfs(2) and
58*7c478bd9Sstevel@tonic-gate  * fstatvfs(2) and will be removed from the system in a near-future
59*7c478bd9Sstevel@tonic-gate  * release.
60*7c478bd9Sstevel@tonic-gate  *
61*7c478bd9Sstevel@tonic-gate  * Supported here purely for 32-bit compatibility.
62*7c478bd9Sstevel@tonic-gate  */
63*7c478bd9Sstevel@tonic-gate 
64*7c478bd9Sstevel@tonic-gate static int cstatfs(struct vfs *, struct statfs32 *, int);
65*7c478bd9Sstevel@tonic-gate 
66*7c478bd9Sstevel@tonic-gate int
67*7c478bd9Sstevel@tonic-gate statfs32(char *fname, struct statfs32 *sbp, int32_t len, int32_t fstyp)
68*7c478bd9Sstevel@tonic-gate {
69*7c478bd9Sstevel@tonic-gate 	vnode_t *vp;
70*7c478bd9Sstevel@tonic-gate 	int error;
71*7c478bd9Sstevel@tonic-gate 
72*7c478bd9Sstevel@tonic-gate lookup:
73*7c478bd9Sstevel@tonic-gate 	if (error = lookupname(fname, UIO_USERSPACE, FOLLOW, NULLVPP, &vp)) {
74*7c478bd9Sstevel@tonic-gate 		if (error == ESTALE)
75*7c478bd9Sstevel@tonic-gate 			goto lookup;
76*7c478bd9Sstevel@tonic-gate 		return (set_errno(error));
77*7c478bd9Sstevel@tonic-gate 	}
78*7c478bd9Sstevel@tonic-gate 	if (fstyp != 0)
79*7c478bd9Sstevel@tonic-gate 		error = EINVAL;
80*7c478bd9Sstevel@tonic-gate 	else
81*7c478bd9Sstevel@tonic-gate 		error = cstatfs(vp->v_vfsp, sbp, len);
82*7c478bd9Sstevel@tonic-gate 	VN_RELE(vp);
83*7c478bd9Sstevel@tonic-gate 	if (error) {
84*7c478bd9Sstevel@tonic-gate 		if (error == ESTALE)
85*7c478bd9Sstevel@tonic-gate 			goto lookup;
86*7c478bd9Sstevel@tonic-gate 		return (set_errno(error));
87*7c478bd9Sstevel@tonic-gate 	}
88*7c478bd9Sstevel@tonic-gate 	return (0);
89*7c478bd9Sstevel@tonic-gate }
90*7c478bd9Sstevel@tonic-gate 
91*7c478bd9Sstevel@tonic-gate int
92*7c478bd9Sstevel@tonic-gate fstatfs32(int32_t fdes, struct statfs32 *sbp, int32_t len, int32_t fstyp)
93*7c478bd9Sstevel@tonic-gate {
94*7c478bd9Sstevel@tonic-gate 	struct file *fp;
95*7c478bd9Sstevel@tonic-gate 	int error;
96*7c478bd9Sstevel@tonic-gate 
97*7c478bd9Sstevel@tonic-gate 	if (fstyp != 0)
98*7c478bd9Sstevel@tonic-gate 		return (set_errno(EINVAL));
99*7c478bd9Sstevel@tonic-gate 	if ((fp = getf(fdes)) == NULL)
100*7c478bd9Sstevel@tonic-gate 		return (set_errno(EBADF));
101*7c478bd9Sstevel@tonic-gate 	error = cstatfs(fp->f_vnode->v_vfsp, sbp, len);
102*7c478bd9Sstevel@tonic-gate 	releasef(fdes);
103*7c478bd9Sstevel@tonic-gate 	if (error)
104*7c478bd9Sstevel@tonic-gate 		return (set_errno(error));
105*7c478bd9Sstevel@tonic-gate 	return (0);
106*7c478bd9Sstevel@tonic-gate }
107*7c478bd9Sstevel@tonic-gate 
108*7c478bd9Sstevel@tonic-gate /*
109*7c478bd9Sstevel@tonic-gate  * Common routine for fstatfs and statfs.
110*7c478bd9Sstevel@tonic-gate  */
111*7c478bd9Sstevel@tonic-gate static int
112*7c478bd9Sstevel@tonic-gate cstatfs(struct vfs *vfsp, struct statfs32 *sbp, int len)
113*7c478bd9Sstevel@tonic-gate {
114*7c478bd9Sstevel@tonic-gate 	struct statfs32 sfs;
115*7c478bd9Sstevel@tonic-gate 	struct statvfs64 svfs;
116*7c478bd9Sstevel@tonic-gate 	int error, i;
117*7c478bd9Sstevel@tonic-gate 	char *cp, *cp2;
118*7c478bd9Sstevel@tonic-gate 	struct vfssw *vswp;
119*7c478bd9Sstevel@tonic-gate 
120*7c478bd9Sstevel@tonic-gate 	if (len < 0 || len > sizeof (struct statfs))
121*7c478bd9Sstevel@tonic-gate 		return (EINVAL);
122*7c478bd9Sstevel@tonic-gate 	if (error = VFS_STATVFS(vfsp, &svfs))
123*7c478bd9Sstevel@tonic-gate 		return (error);
124*7c478bd9Sstevel@tonic-gate 
125*7c478bd9Sstevel@tonic-gate 	if (svfs.f_blocks > UINT32_MAX || svfs.f_bfree > UINT32_MAX ||
126*7c478bd9Sstevel@tonic-gate 	    svfs.f_files > UINT32_MAX || svfs.f_ffree > UINT32_MAX)
127*7c478bd9Sstevel@tonic-gate 	    return (EOVERFLOW);
128*7c478bd9Sstevel@tonic-gate 	/*
129*7c478bd9Sstevel@tonic-gate 	 * Map statvfs fields into the old statfs structure.
130*7c478bd9Sstevel@tonic-gate 	 */
131*7c478bd9Sstevel@tonic-gate 	bzero(&sfs, sizeof (sfs));
132*7c478bd9Sstevel@tonic-gate 	sfs.f_bsize = svfs.f_bsize;
133*7c478bd9Sstevel@tonic-gate 	sfs.f_frsize = (svfs.f_frsize == svfs.f_bsize) ? 0 : svfs.f_frsize;
134*7c478bd9Sstevel@tonic-gate 	sfs.f_blocks = svfs.f_blocks * (svfs.f_frsize / 512);
135*7c478bd9Sstevel@tonic-gate 	sfs.f_bfree = svfs.f_bfree * (svfs.f_frsize / 512);
136*7c478bd9Sstevel@tonic-gate 	sfs.f_files = svfs.f_files;
137*7c478bd9Sstevel@tonic-gate 	sfs.f_ffree = svfs.f_ffree;
138*7c478bd9Sstevel@tonic-gate 
139*7c478bd9Sstevel@tonic-gate 	cp = svfs.f_fstr;
140*7c478bd9Sstevel@tonic-gate 	cp2 = sfs.f_fname;
141*7c478bd9Sstevel@tonic-gate 	i = 0;
142*7c478bd9Sstevel@tonic-gate 	while (i++ < sizeof (sfs.f_fname))
143*7c478bd9Sstevel@tonic-gate 		if (*cp != '\0')
144*7c478bd9Sstevel@tonic-gate 			*cp2++ = *cp++;
145*7c478bd9Sstevel@tonic-gate 		else
146*7c478bd9Sstevel@tonic-gate 			*cp2++ = '\0';
147*7c478bd9Sstevel@tonic-gate 	while (*cp != '\0' &&
148*7c478bd9Sstevel@tonic-gate 	    i++ < (sizeof (svfs.f_fstr) - sizeof (sfs.f_fpack)))
149*7c478bd9Sstevel@tonic-gate 		cp++;
150*7c478bd9Sstevel@tonic-gate 	(void) strncpy(sfs.f_fpack, cp + 1, sizeof (sfs.f_fpack));
151*7c478bd9Sstevel@tonic-gate 	if ((vswp = vfs_getvfssw(svfs.f_basetype)) == NULL)
152*7c478bd9Sstevel@tonic-gate 		sfs.f_fstyp = 0;
153*7c478bd9Sstevel@tonic-gate 	else {
154*7c478bd9Sstevel@tonic-gate 		sfs.f_fstyp = vswp - vfssw;
155*7c478bd9Sstevel@tonic-gate 		vfs_unrefvfssw(vswp);
156*7c478bd9Sstevel@tonic-gate 	}
157*7c478bd9Sstevel@tonic-gate 
158*7c478bd9Sstevel@tonic-gate 	if (copyout(&sfs, sbp, len))
159*7c478bd9Sstevel@tonic-gate 		return (EFAULT);
160*7c478bd9Sstevel@tonic-gate 
161*7c478bd9Sstevel@tonic-gate 	return (0);
162*7c478bd9Sstevel@tonic-gate }
163*7c478bd9Sstevel@tonic-gate 
164*7c478bd9Sstevel@tonic-gate #endif	/* _SYSCALL32_IMPL || _ILP32 */
165