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.

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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: head/sys/fs/devfs/devfs_vfsops.c 65132 2000-08-27 14:46:36Z phk $
35 */
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/kernel.h>
40#include <sys/proc.h>
41#include <sys/vnode.h>
42#include <sys/mount.h>

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62static int
63devfs_mount(mp, path, data, ndp, p)
64 struct mount *mp;
65 char *path;
66 caddr_t data;
67 struct nameidata *ndp;
68 struct proc *p;
69{
70 int error;
71 u_int size;
72 struct devfs_mount *fmp;
73 struct vnode *rvp;
74
75 error = 0;
76 /*
77 * XXX: flag changes.
78 */
79 if (mp->mnt_flag & MNT_UPDATE)
80 return (EOPNOTSUPP);
81
82 MALLOC(fmp, struct devfs_mount *, sizeof(struct devfs_mount),
83 M_DEVFS, M_WAITOK);
84 bzero(fmp, sizeof(*fmp));
85
86 mp->mnt_flag |= MNT_LOCAL;
87 mp->mnt_data = (qaddr_t) fmp;
88 vfs_getnewfsid(mp);
89
90 fmp->dm_inode = NDEVINO;
91
92 fmp->dm_rootdir = devfs_vmkdir("(root)", 6, NULL);
93 fmp->dm_rootdir->de_inode = 2;
94 fmp->dm_basedir = fmp->dm_rootdir;
95
96 error = devfs_root(mp, &rvp);
97 if (error) {
98 FREE(fmp, M_DEVFS);
99 return (error);
100 }
101 VOP_UNLOCK(rvp, 0, p);
102
103 if (path != NULL) {
104 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
105 } else {
106 strcpy(mp->mnt_stat.f_mntonname, "/");
107 size = 1;
108 }
109 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
110 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);

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118static int
119devfs_unmount(mp, mntflags, p)
120 struct mount *mp;
121 int mntflags;
122 struct proc *p;
123{
124 int error;
125 int flags = 0;
126 struct vnode *rootvp;
127 struct devfs_mount *fmp;
128
129 error = devfs_root(mp, &rootvp);
130 if (error)
131 return (error);
132 fmp = VFSTODEVFS(mp);
133 if (mntflags & MNT_FORCE)
134 flags |= FORCECLOSE;
135 if (rootvp->v_usecount > 2)
136 return (EBUSY);
137 devfs_purge(fmp->dm_rootdir);
138 error = vflush(mp, rootvp, flags);
139 if (error)
140 return (error);
141 vput(rootvp);
142 vrele(rootvp);
143 vgone(rootvp);
144 mp->mnt_data = 0;
145 free(fmp, M_DEVFS);
146 return 0;
147}
148
149/* Return locked reference to root. */
150
151static int
152devfs_root(mp, vpp)
153 struct mount *mp;
154 struct vnode **vpp;
155{
156 int error;
157 struct proc *p;
158 struct vnode *vp;
159 struct devfs_mount *dmp;
160
161 p = curproc; /* XXX */
162 dmp = VFSTODEVFS(mp);
163 error = devfs_allocv(dmp->dm_rootdir, mp, &vp, p);
164 if (error)
165 return (error);
166 vp->v_flag |= VROOT;
167 *vpp = vp;
168 return (0);
169}
170
171static int
172devfs_statfs(mp, sbp, p)
173 struct mount *mp;
174 struct statfs *sbp;

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