1 /* $NetBSD: vfs_syscalls_20.c,v 1.46 2020/06/28 14:37:53 christos Exp $ */
2
3 /*
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)vfs_syscalls.c 8.42 (Berkeley) 7/31/95
37 */
38
39 #include <sys/cdefs.h>
40 __KERNEL_RCSID(0, "$NetBSD: vfs_syscalls_20.c,v 1.46 2020/06/28 14:37:53 christos Exp $");
41
42 #ifdef _KERNEL_OPT
43 #include "opt_compat_netbsd.h"
44 #endif
45
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/namei.h>
49 #include <sys/filedesc.h>
50 #include <sys/kernel.h>
51 #include <sys/file.h>
52 #include <sys/stat.h>
53 #include <sys/vnode.h>
54 #include <sys/mount.h>
55 #include <sys/proc.h>
56 #include <sys/uio.h>
57 #include <sys/dirent.h>
58 #include <sys/sysctl.h>
59 #include <sys/syscall.h>
60 #include <sys/syscallvar.h>
61 #include <sys/syscallargs.h>
62 #include <sys/kauth.h>
63 #include <sys/vfs_syscalls.h>
64
65 #include <compat/common/compat_mod.h>
66
67 #include <compat/sys/mount.h>
68 #include <compat/sys/statvfs.h>
69
70 static const struct syscall_package vfs_syscalls_20_syscalls[] = {
71 { SYS_compat_20_fhstatfs, 0, (sy_call_t *)compat_20_sys_fhstatfs },
72 { SYS_compat_20_fstatfs, 0, (sy_call_t *)compat_20_sys_fstatfs },
73 { SYS_compat_20_getfsstat, 0, (sy_call_t *)compat_20_sys_getfsstat },
74 { SYS_compat_20_statfs, 0, (sy_call_t *)compat_20_sys_statfs },
75 { 0, 0, NULL }
76 };
77
78 /*
79 * Get filesystem statistics.
80 */
81 /* ARGSUSED */
82 int
compat_20_sys_statfs(struct lwp * l,const struct compat_20_sys_statfs_args * uap,register_t * retval)83 compat_20_sys_statfs(struct lwp *l, const struct compat_20_sys_statfs_args *uap, register_t *retval)
84 {
85 /* {
86 syscallarg(const char *) path;
87 syscallarg(struct statfs12 *) buf;
88 } */
89 struct mount *mp;
90 struct statvfs *sbuf;
91 int error;
92 struct vnode *vp;
93
94 error = namei_simple_user(SCARG(uap, path),
95 NSM_FOLLOW_TRYEMULROOT, &vp);
96 if (error != 0)
97 return error;
98
99 mp = vp->v_mount;
100
101 sbuf = STATVFSBUF_GET();
102 if ((error = dostatvfs(mp, sbuf, l, 0, 1)) != 0)
103 goto done;
104
105 error = statvfs_to_statfs12_copy(sbuf, SCARG(uap, buf), 0);
106 done:
107 vrele(vp);
108 STATVFSBUF_PUT(sbuf);
109 return error;
110 }
111
112 /*
113 * Get filesystem statistics.
114 */
115 /* ARGSUSED */
116 int
compat_20_sys_fstatfs(struct lwp * l,const struct compat_20_sys_fstatfs_args * uap,register_t * retval)117 compat_20_sys_fstatfs(struct lwp *l, const struct compat_20_sys_fstatfs_args *uap, register_t *retval)
118 {
119 /* {
120 syscallarg(int) fd;
121 syscallarg(struct statfs12 *) buf;
122 } */
123 struct file *fp;
124 struct mount *mp;
125 struct statvfs *sbuf;
126 int error;
127
128 /* fd_getvnode() will use the descriptor for us */
129 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0)
130 return (error);
131 mp = fp->f_vnode->v_mount;
132 sbuf = STATVFSBUF_GET();
133 if ((error = dostatvfs(mp, sbuf, l, 0, 1)) != 0)
134 goto out;
135 error = statvfs_to_statfs12_copy(sbuf, SCARG(uap, buf), 0);
136 out:
137 fd_putfile(SCARG(uap, fd));
138 STATVFSBUF_PUT(sbuf);
139 return error;
140 }
141
142
143 /*
144 * Get statistics on all filesystems.
145 */
146 int
compat_20_sys_getfsstat(struct lwp * l,const struct compat_20_sys_getfsstat_args * uap,register_t * retval)147 compat_20_sys_getfsstat(struct lwp *l, const struct compat_20_sys_getfsstat_args *uap, register_t *retval)
148 {
149 /* {
150 syscallarg(struct statfs12 *) buf;
151 syscallarg(long) bufsize;
152 syscallarg(int) flags;
153 } */
154 return do_sys_getvfsstat(l, SCARG(uap, buf), SCARG(uap, bufsize),
155 SCARG(uap, flags), statvfs_to_statfs12_copy,
156 sizeof(struct statfs12), retval);
157 }
158
159 int
compat_20_sys_fhstatfs(struct lwp * l,const struct compat_20_sys_fhstatfs_args * uap,register_t * retval)160 compat_20_sys_fhstatfs(struct lwp *l, const struct compat_20_sys_fhstatfs_args *uap, register_t *retval)
161 {
162 /* {
163 syscallarg(const struct compat_30_fhandle *) fhp;
164 syscallarg(struct statfs12 *) buf;
165 } */
166 struct statvfs *sbuf;
167 struct compat_30_fhandle fh;
168 struct mount *mp;
169 struct vnode *vp;
170 int error;
171
172 /*
173 * Must be super user
174 */
175 if ((error = kauth_authorize_system(l->l_cred,
176 KAUTH_SYSTEM_FILEHANDLE, 0, NULL, NULL, NULL)))
177 return (error);
178
179 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fh))) != 0)
180 return (error);
181
182 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
183 return (ESTALE);
184 error = VFS_FHTOVP(mp, (struct fid*)&fh.fh_fid, LK_EXCLUSIVE, &vp);
185 if (error != 0)
186 return (error);
187 mp = vp->v_mount;
188 VOP_UNLOCK(vp);
189 sbuf = STATVFSBUF_GET();
190 if ((error = VFS_STATVFS(mp, sbuf)) != 0)
191 goto out;
192 error = statvfs_to_statfs12_copy(sbuf, SCARG(uap, buf), 0);
193 out:
194 vrele(vp);
195 STATVFSBUF_PUT(sbuf);
196 return error;
197 }
198
199 int
vfs_syscalls_20_init(void)200 vfs_syscalls_20_init(void)
201 {
202
203 return syscall_establish(NULL, vfs_syscalls_20_syscalls);
204 }
205
206 int
vfs_syscalls_20_fini(void)207 vfs_syscalls_20_fini(void)
208 {
209
210 return syscall_disestablish(NULL, vfs_syscalls_20_syscalls);
211 }
212