1/* $NetBSD: vfs_syscalls_20.c,v 1.39 2015/07/24 13:02:52 maxv 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 1.39 2015/07/24 13:02:52 maxv 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/malloc.h>
58#include <sys/dirent.h>
59#include <sys/sysctl.h>
60#include <sys/syscallargs.h>
61#include <sys/kauth.h>
62
63#include <compat/sys/mount.h>
64
65#define MOUNTNO_NONE 0
66#define MOUNTNO_UFS 1 /* UNIX "Fast" Filesystem */
67#define MOUNTNO_NFS 2 /* Network Filesystem */
68#define MOUNTNO_MFS 3 /* Memory Filesystem */
69#define MOUNTNO_MSDOS 4 /* MSDOS Filesystem */
70#define MOUNTNO_CD9660 5 /* iso9660 cdrom */
71#define MOUNTNO_FDESC 6 /* /dev/fd filesystem */
72#define MOUNTNO_KERNFS 7 /* kernel variable filesystem */
73#define MOUNTNO_DEVFS 8 /* device node filesystem */
74#define MOUNTNO_AFS 9 /* AFS 3.x */
75static const struct {
76 const char *name;
77 const int value;
78} nv[] = {
79 { MOUNT_UFS, MOUNTNO_UFS },
80 { MOUNT_NFS, MOUNTNO_NFS },
81 { MOUNT_MFS, MOUNTNO_MFS },
82 { MOUNT_MSDOS, MOUNTNO_MSDOS },
83 { MOUNT_CD9660, MOUNTNO_CD9660 },
84 { MOUNT_FDESC, MOUNTNO_FDESC },
85 { MOUNT_KERNFS, MOUNTNO_KERNFS },
86 { MOUNT_AFS, MOUNTNO_AFS },
87};
88
89static int
90vfs2fs(struct statfs12 *bfs, const struct statvfs *fs)
91{
92 struct statfs12 ofs;
93 int i;
94 ofs.f_type = 0;
95 ofs.f_oflags = (short)fs->f_flag;
96
97 for (i = 0; i < sizeof(nv) / sizeof(nv[0]); i++) {
98 if (strcmp(nv[i].name, fs->f_fstypename) == 0) {
99 ofs.f_type = nv[i].value;
100 break;
101 }
102 }
103#define CLAMP(a) (long)(((a) & ~LONG_MAX) ? LONG_MAX : (a))
104 ofs.f_bsize = CLAMP(fs->f_frsize);
105 ofs.f_iosize = CLAMP(fs->f_iosize);
106 ofs.f_blocks = CLAMP(fs->f_blocks);
107 ofs.f_bfree = CLAMP(fs->f_bfree);
108 if (fs->f_bfree > fs->f_bresvd)
109 ofs.f_bavail = CLAMP(fs->f_bfree - fs->f_bresvd);
110 else
111 ofs.f_bavail = -CLAMP(fs->f_bresvd - fs->f_bfree);
112 ofs.f_files = CLAMP(fs->f_files);
113 ofs.f_ffree = CLAMP(fs->f_ffree);
114 ofs.f_fsid = fs->f_fsidx;
115 ofs.f_owner = fs->f_owner;
116 ofs.f_flags = (long)fs->f_flag;
117 ofs.f_syncwrites = CLAMP(fs->f_syncwrites);
118 ofs.f_asyncwrites = CLAMP(fs->f_asyncwrites);
119 (void)strncpy(ofs.f_fstypename, fs->f_fstypename,
120 sizeof(ofs.f_fstypename));
121 (void)strncpy(ofs.f_mntonname, fs->f_mntonname,
122 sizeof(ofs.f_mntonname));
123 (void)strncpy(ofs.f_mntfromname, fs->f_mntfromname,
124 sizeof(ofs.f_mntfromname));
125
126 return copyout(&ofs, bfs, sizeof(ofs));
127}
128
129/*
130 * Get filesystem statistics.
131 */
132/* ARGSUSED */
133int
134compat_20_sys_statfs(struct lwp *l, const struct compat_20_sys_statfs_args *uap, register_t *retval)
135{
136 /* {
137 syscallarg(const char *) path;
138 syscallarg(struct statfs12 *) buf;
139 } */
140 struct mount *mp;
141 struct statvfs *sbuf;
142 int error;
143 struct vnode *vp;
144
145 error = namei_simple_user(SCARG(uap, path),
146 NSM_FOLLOW_TRYEMULROOT, &vp);
147 if (error != 0)
148 return error;
149
150 mp = vp->v_mount;
151
152 sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK);
153 if ((error = dostatvfs(mp, sbuf, l, 0, 1)) != 0)
154 goto done;
155
156 error = vfs2fs(SCARG(uap, buf), sbuf);
157done:
158 vrele(vp);
159 free(sbuf, M_TEMP);
160 return error;
161}
162
163/*
164 * Get filesystem statistics.
165 */
166/* ARGSUSED */
167int
168compat_20_sys_fstatfs(struct lwp *l, const struct compat_20_sys_fstatfs_args *uap, register_t *retval)
169{
170 /* {
171 syscallarg(int) fd;
172 syscallarg(struct statfs12 *) buf;
173 } */
174 struct file *fp;
175 struct mount *mp;
176 struct statvfs *sbuf;
177 int error;
178
179 /* fd_getvnode() will use the descriptor for us */
180 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0)
181 return (error);
182 mp = fp->f_vnode->v_mount;
183 sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK);
184 if ((error = dostatvfs(mp, sbuf, l, 0, 1)) != 0)
185 goto out;
186 error = vfs2fs(SCARG(uap, buf), sbuf);
187 out:
188 fd_putfile(SCARG(uap, fd));
189 free(sbuf, M_TEMP);
190 return error;
191}
192
193
194/*
195 * Get statistics on all filesystems.
196 */
197int
198compat_20_sys_getfsstat(struct lwp *l, const struct compat_20_sys_getfsstat_args *uap, register_t *retval)
199{
200 /* {
201 syscallarg(struct statfs12 *) buf;
202 syscallarg(long) bufsize;
203 syscallarg(int) flags;
204 } */
205 int root = 0;
206 struct mount *mp, *nmp;
207 struct statvfs *sbuf;
208 struct statfs12 *sfsp;
209 size_t count, maxcount;
210 int error = 0;
211
212 sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK);
213 maxcount = (size_t)SCARG(uap, bufsize) / sizeof(struct statfs12);
214 sfsp = SCARG(uap, buf);
215 mutex_enter(&mountlist_lock);
216 count = 0;
217 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) {
218 if (vfs_busy(mp, &nmp)) {
219 continue;
220 }
221 if (sfsp && count < maxcount) {
222 error = dostatvfs(mp, sbuf, l, SCARG(uap, flags), 0);
223 if (error) {
224 vfs_unbusy(mp, false, &nmp);
225 continue;
226 }
227 error = vfs2fs(sfsp, sbuf);
228 if (error) {
229 vfs_unbusy(mp, false, NULL);
230 goto out;
231 }
232 sfsp++;
233 root |= strcmp(sbuf->f_mntonname, "/") == 0;
234 }
235 count++;
236 vfs_unbusy(mp, false, &nmp);
237 }
238 mutex_exit(&mountlist_lock);
239 if (root == 0 && l->l_proc->p_cwdi->cwdi_rdir) {
240 /*
241 * fake a root entry
242 */
243 if ((error = dostatvfs(l->l_proc->p_cwdi->cwdi_rdir->v_mount,
244 sbuf, l, SCARG(uap, flags), 1)) != 0)
245 goto out;
246 if (sfsp)
247 error = vfs2fs(sfsp, sbuf);
248 count++;
249 }
250 if (sfsp && count > maxcount)
251 *retval = maxcount;
252 else
253 *retval = count;
254out:
255 free(sbuf, M_TEMP);
256 return error;
257}
258
259int
260compat_20_sys_fhstatfs(struct lwp *l, const struct compat_20_sys_fhstatfs_args *uap, register_t *retval)
261{
262 /* {
263 syscallarg(const struct compat_30_fhandle *) fhp;
264 syscallarg(struct statfs12 *) buf;
265 } */
266 struct statvfs *sbuf;
267 struct compat_30_fhandle fh;
268 struct mount *mp;
269 struct vnode *vp;
270 int error;
271
272 /*
273 * Must be super user
274 */
275 if ((error = kauth_authorize_system(l->l_cred,
276 KAUTH_SYSTEM_FILEHANDLE, 0, NULL, NULL, NULL)))
277 return (error);
278
279 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fh))) != 0)
280 return (error);
281
282 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
283 return (ESTALE);
284 if ((error = VFS_FHTOVP(mp, (struct fid*)&fh.fh_fid, &vp)))
285 return (error);
286 mp = vp->v_mount;
287 VOP_UNLOCK(vp);
288 sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK);
289 if ((error = VFS_STATVFS(mp, sbuf)) != 0)
290 goto out;
291 error = vfs2fs(SCARG(uap, buf), sbuf);
292out:
293 vrele(vp);
294 free(sbuf, M_TEMP);
295 return error;
296}
297