1 /* $NetBSD: vfs.c,v 1.9 2021/09/05 11:43:22 mlelstv Exp $ */
2
3 /*-
4 * Copyright (c) 2006-2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 #ifdef __FreeBSD__
31 __FBSDID("$FreeBSD: head/sys/cddl/compat/opensolaris/kern/opensolaris_lookup.c 314194 2017-02-24 07:53:56Z avg $");
32 #endif
33
34 #include <sys/param.h>
35 #include <sys/kernel.h>
36 #include <sys/systm.h>
37 #include <sys/mount.h>
38 #include <sys/cred.h>
39 #include <sys/vfs.h>
40 #include <sys/pathname.h>
41 #include <lib/libkern/libkern.h>
42
43 int
lookupname(char * dirname,enum uio_seg seg,enum symfollow follow,vnode_t ** dirvpp,vnode_t ** compvpp)44 lookupname(char *dirname, enum uio_seg seg, enum symfollow follow,
45 vnode_t **dirvpp, vnode_t **compvpp)
46 {
47 int error;
48
49 KASSERT(seg == UIO_SYSSPACE);
50 KASSERT(dirvpp == NULL);
51
52 *compvpp = NULL;
53 error = namei_simple_kernel(dirname,
54 follow == FOLLOW ? NSM_FOLLOW_NOEMULROOT : NSM_NOFOLLOW_NOEMULROOT,
55 compvpp);
56
57 KASSERT(error == 0 || *compvpp == NULL);
58
59 return error;
60 }
61
62 void
vfs_setmntopt(vfs_t * vfsp,const char * name,const char * arg,int flags)63 vfs_setmntopt(vfs_t *vfsp, const char *name, const char *arg,
64 int flags)
65 {
66
67 if (strcmp("ro", name) == 0)
68 vfsp->mnt_flag |= MNT_RDONLY;
69
70 if (strcmp("rw", name) == 0)
71 vfsp->mnt_flag &= ~MNT_RDONLY;
72
73 if (strcmp("nodevices", name) == 0)
74 vfsp->mnt_flag |= MNT_NODEV;
75
76 if (strcmp("noatime", name) == 0)
77 vfsp->mnt_flag |= MNT_NOATIME;
78
79 if (strcmp("atime", name) == 0)
80 vfsp->mnt_flag &= ~MNT_NOATIME;
81
82 if (strcmp("nosuid", name) == 0)
83 vfsp->mnt_flag |= MNT_NOSUID;
84
85 if (strcmp("suid", name) == 0)
86 vfsp->mnt_flag &= ~MNT_NOSUID;
87
88 if (strcmp("noexec", name) == 0)
89 vfsp->mnt_flag |= MNT_NOEXEC;
90
91 if (strcmp("exec", name) == 0)
92 vfsp->mnt_flag &= ~MNT_NOEXEC;
93
94 vfsp->mnt_flag |= MNT_LOCAL;
95 }
96
97 void
vfs_clearmntopt(vfs_t * vfsp,const char * name)98 vfs_clearmntopt(vfs_t *vfsp, const char *name)
99 {
100
101 if (strcmp("ro", name) == 0)
102 vfsp->mnt_flag |= MNT_RDONLY;
103
104 if (strcmp("rw", name) == 0)
105 vfsp->mnt_flag &= ~MNT_RDONLY;
106
107 if (strcmp("nodevices", name) == 0)
108 vfsp->mnt_flag &= ~MNT_NODEV;
109
110 if (strcmp("noatime", name) == 0)
111 vfsp->mnt_flag &= ~MNT_NOATIME;
112
113 if (strcmp("atime", name) == 0)
114 vfsp->mnt_flag |= MNT_NOATIME;
115
116 if (strcmp("nosuid", name) == 0)
117 vfsp->mnt_flag &= ~MNT_NOSUID;
118
119 if (strcmp("suid", name) == 0)
120 vfsp->mnt_flag |= MNT_NOSUID;
121
122 if (strcmp("noexec", name) == 0)
123 vfsp->mnt_flag &= ~MNT_NOEXEC;
124
125 if (strcmp("exec", name) == 0)
126 vfsp->mnt_flag |= MNT_NOEXEC;
127 }
128
129 int
vfs_optionisset(const vfs_t * vfsp,const char * name,char ** argp)130 vfs_optionisset(const vfs_t *vfsp, const char *name, char **argp)
131 {
132
133 if (strcmp("ro", name) == 0)
134 return (vfsp->mnt_flag & MNT_RDONLY) != 0;
135
136 if (strcmp("rw", name) == 0)
137 return (vfsp->mnt_flag & MNT_RDONLY) == 0;
138
139 if (strcmp("nodevices", name) == 0)
140 return (vfsp->mnt_flag & MNT_NODEV) != 0;
141
142 if (strcmp("noatime", name) == 0)
143 return (vfsp->mnt_flag & MNT_NOATIME) != 0;
144
145 if (strcmp("atime", name) == 0)
146 return (vfsp->mnt_flag & MNT_NOATIME) == 0;
147
148 if (strcmp("nosuid", name) == 0)
149 return (vfsp->mnt_flag & MNT_NOSUID) != 0;
150
151 if (strcmp("suid", name) == 0)
152 return (vfsp->mnt_flag & MNT_NOSUID) == 0;
153
154 if (strcmp("noexec", name) == 0)
155 return (vfsp->mnt_flag & MNT_NOEXEC) != 0;
156
157 if (strcmp("exec", name) == 0)
158 return (vfsp->mnt_flag & MNT_NOEXEC) == 0;
159
160 return 0;
161 }
162