1 /*-
2 * Copyright (c) 1992, 1993, 1995
3 * The Regents of the University of California. All rights reserved.
4 * Copyright (c) 2000
5 * Poul-Henning Kamp. All rights reserved.
6 *
7 * This code is derived from software donated to Berkeley by
8 * Jan-Simon Pendry.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)kernfs_vfsops.c 8.10 (Berkeley) 5/14/95
32 * From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vfsops.c 1.36
33 *
34 * $FreeBSD$
35 */
36
37 #include "opt_devfs.h"
38 #include "opt_mac.h"
39
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/kernel.h>
43 #include <sys/lock.h>
44 #include <sys/mac.h>
45 #include <sys/malloc.h>
46 #include <sys/mount.h>
47 #include <sys/proc.h>
48 #include <sys/vnode.h>
49
50 #include <fs/devfs/devfs.h>
51
52 MALLOC_DEFINE(M_DEVFS, "DEVFS", "DEVFS data");
53
54 static vfs_mount_t devfs_mount;
55 static vfs_unmount_t devfs_unmount;
56 static vfs_root_t devfs_root;
57 static vfs_statfs_t devfs_statfs;
58
59 /*
60 * Mount the filesystem
61 */
62 static int
63 devfs_mount(struct mount *mp, struct thread *td)
64 {
65 int error;
66 struct devfs_mount *fmp;
67 struct vnode *rvp;
68
69 error = 0;
70 /*
71 * XXX: flag changes.
72 */
73 if (mp->mnt_flag & MNT_UPDATE)
74 return (EOPNOTSUPP);
75
76 MALLOC(fmp, struct devfs_mount *, sizeof(struct devfs_mount),
77 M_DEVFS, M_WAITOK | M_ZERO);
78 MALLOC(fmp->dm_dirent, struct devfs_dirent **,
79 sizeof(struct devfs_dirent *) * NDEVFSINO,
80 M_DEVFS, M_WAITOK | M_ZERO);
81 lockinit(&fmp->dm_lock, PVFS, "devfs", 0, LK_NOPAUSE);
82
83 mp->mnt_flag |= MNT_LOCAL;
84 #ifdef MAC
85 mp->mnt_flag |= MNT_MULTILABEL;
86 #endif
87 fmp->dm_mount = mp;
88 mp->mnt_data = (qaddr_t) fmp;
89 vfs_getnewfsid(mp);
90
91 fmp->dm_inode = DEVFSINOMOUNT;
92
93 fmp->dm_rootdir = devfs_vmkdir("(root)", 6, NULL);
94 fmp->dm_rootdir->de_inode = 2;
95 #ifdef MAC
96 mac_create_devfs_directory(mp, "", 0, fmp->dm_rootdir);
97 #endif
98 fmp->dm_basedir = fmp->dm_rootdir;
99 devfs_rules_newmount(fmp, td);
100
101 error = devfs_root(mp, &rvp, td);
102 if (error) {
103 lockdestroy(&fmp->dm_lock);
104 FREE(fmp, M_DEVFS);
105 return (error);
106 }
107 VOP_UNLOCK(rvp, 0, td);
108
109 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
110 bcopy("devfs", mp->mnt_stat.f_mntfromname, sizeof("devfs"));
111 (void)devfs_statfs(mp, &mp->mnt_stat, td);
112
113 return (0);
114 }
115
116 static int
117 devfs_unmount(mp, mntflags, td)
118 struct mount *mp;
119 int mntflags;
120 struct thread *td;
121 {
122 int error;
123 int flags = 0;
124 struct devfs_mount *fmp;
125
126 fmp = VFSTODEVFS(mp);
127 if (mntflags & MNT_FORCE)
128 flags |= FORCECLOSE;
129 /* There is 1 extra root vnode reference from devfs_mount(). */
130 error = vflush(mp, 1, flags, td);
131 if (error)
132 return (error);
133 devfs_purge(fmp->dm_rootdir);
134 mp->mnt_data = 0;
135 lockdestroy(&fmp->dm_lock);
136 free(fmp->dm_dirent, M_DEVFS);
137 free(fmp, M_DEVFS);
138 return 0;
139 }
140
141 /* Return locked reference to root. */
142
143 static int
144 devfs_root(mp, vpp, td)
145 struct mount *mp;
146 struct vnode **vpp;
147 struct thread *td;
148 {
149 int error;
150 struct vnode *vp;
151 struct devfs_mount *dmp;
152
153 dmp = VFSTODEVFS(mp);
154 error = devfs_allocv(dmp->dm_rootdir, mp, &vp, td);
155 if (error)
156 return (error);
157 vp->v_vflag |= VV_ROOT;
158 *vpp = vp;
159 return (0);
160 }
161
162 static int
163 devfs_statfs(mp, sbp, td)
164 struct mount *mp;
165 struct statfs *sbp;
166 struct thread *td;
167 {
168
169 sbp->f_flags = 0;
170 sbp->f_bsize = DEV_BSIZE;
171 sbp->f_iosize = DEV_BSIZE;
172 sbp->f_blocks = 2; /* 1K to keep df happy */
173 sbp->f_bfree = 0;
174 sbp->f_bavail = 0;
175 sbp->f_files = 0;
176 sbp->f_ffree = 0;
177 if (sbp != &mp->mnt_stat) {
178 sbp->f_type = mp->mnt_vfc->vfc_typenum;
179 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
180 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
181 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
182 }
183 return (0);
184 }
185
186 static struct vfsops devfs_vfsops = {
187 .vfs_mount = devfs_mount,
188 .vfs_root = devfs_root,
189 .vfs_statfs = devfs_statfs,
190 .vfs_unmount = devfs_unmount,
191 };
192
193 VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC);
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