1/*
2 * Copyright (c) 1992, 1993, 1995
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software donated to Berkeley by
6 * Jan-Simon Pendry.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. 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 * @(#)fdesc_vfsops.c 8.4 (Berkeley) 1/21/94
37 *
| 1/*
2 * Copyright (c) 1992, 1993, 1995
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software donated to Berkeley by
6 * Jan-Simon Pendry.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. 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 * @(#)fdesc_vfsops.c 8.4 (Berkeley) 1/21/94
37 *
|
39 */
40
41/*
42 * /dev/fd Filesystem
43 */
44
45#include <sys/param.h>
46#include <sys/systm.h>
47#include <sys/kernel.h>
48#include <sys/proc.h>
49#include <sys/resourcevar.h>
50#include <sys/filedesc.h>
51#include <sys/vnode.h>
52#include <sys/mount.h>
53#include <sys/malloc.h>
54#include <miscfs/fdesc/fdesc.h>
55
56static int fdesc_fhtovp __P((struct mount *mp, struct fid *fhp,
57 struct mbuf *nam, struct vnode **vpp,
58 int *exflagsp, struct ucred **credanonp));
59static int fdesc_mount __P((struct mount *mp, char *path, caddr_t data,
60 struct nameidata *ndp, struct proc *p));
61static int fdesc_quotactl __P((struct mount *mp, int cmd, uid_t uid,
62 caddr_t arg, struct proc *p));
63static int fdesc_start __P((struct mount *mp, int flags, struct proc *p));
64static int fdesc_unmount __P((struct mount *mp, int mntflags,
65 struct proc *p));
66static int fdesc_statfs __P((struct mount *mp, struct statfs *sbp,
67 struct proc *p));
68static int fdesc_sync __P((struct mount *mp, int waitfor,
69 struct ucred *cred, struct proc *p));
70static int fdesc_vget __P((struct mount *mp, ino_t ino,
71 struct vnode **vpp));
72static int fdesc_vptofh __P((struct vnode *vp, struct fid *fhp));
73
74/*
75 * Mount the per-process file descriptors (/dev/fd)
76 */
77static int
78fdesc_mount(mp, path, data, ndp, p)
79 struct mount *mp;
80 char *path;
81 caddr_t data;
82 struct nameidata *ndp;
83 struct proc *p;
84{
85 int error = 0;
86 u_int size;
87 struct fdescmount *fmp;
88 struct vnode *rvp;
89
90 /*
91 * Update is a no-op
92 */
93 if (mp->mnt_flag & MNT_UPDATE)
94 return (EOPNOTSUPP);
95
96 error = fdesc_allocvp(Froot, FD_ROOT, mp, &rvp);
97 if (error)
98 return (error);
99
100 MALLOC(fmp, struct fdescmount *, sizeof(struct fdescmount),
101 M_UFSMNT, M_WAITOK); /* XXX */
102 rvp->v_type = VDIR;
103 rvp->v_flag |= VROOT;
104 fmp->f_root = rvp;
105 /* XXX -- don't mark as local to work around fts() problems */
106 /*mp->mnt_flag |= MNT_LOCAL;*/
107 mp->mnt_data = (qaddr_t) fmp;
108 vfs_getnewfsid(mp);
109
110 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
111 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
112 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
113 bcopy("fdesc", mp->mnt_stat.f_mntfromname, sizeof("fdesc"));
114 (void)fdesc_statfs(mp, &mp->mnt_stat, p);
115 return (0);
116}
117
118static int
119fdesc_start(mp, flags, p)
120 struct mount *mp;
121 int flags;
122 struct proc *p;
123{
124 return (0);
125}
126
127static int
128fdesc_unmount(mp, mntflags, p)
129 struct mount *mp;
130 int mntflags;
131 struct proc *p;
132{
133 int error;
134 int flags = 0;
135 struct vnode *rootvp = VFSTOFDESC(mp)->f_root;
136
137 if (mntflags & MNT_FORCE)
138 flags |= FORCECLOSE;
139
140 /*
141 * Clear out buffer cache. I don't think we
142 * ever get anything cached at this level at the
143 * moment, but who knows...
144 */
145 if (rootvp->v_usecount > 1)
146 return (EBUSY);
147 if (error = vflush(mp, rootvp, flags))
148 return (error);
149
150 /*
151 * Release reference on underlying root vnode
152 */
153 vrele(rootvp);
154 /*
155 * And blow it away for future re-use
156 */
157 vgone(rootvp);
158 /*
159 * Finally, throw away the fdescmount structure
160 */
161 free(mp->mnt_data, M_UFSMNT); /* XXX */
162 mp->mnt_data = 0;
163
164 return (0);
165}
166
167int
168fdesc_root(mp, vpp)
169 struct mount *mp;
170 struct vnode **vpp;
171{
172 struct proc *p = curproc; /* XXX */
173 struct vnode *vp;
174
175 /*
176 * Return locked reference to root.
177 */
178 vp = VFSTOFDESC(mp)->f_root;
179 VREF(vp);
180 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
181 *vpp = vp;
182 return (0);
183}
184
185static int
186fdesc_statfs(mp, sbp, p)
187 struct mount *mp;
188 struct statfs *sbp;
189 struct proc *p;
190{
191 struct filedesc *fdp;
192 int lim;
193 int i;
194 int last;
195 int freefd;
196
197 /*
198 * Compute number of free file descriptors.
199 * [ Strange results will ensue if the open file
200 * limit is ever reduced below the current number
201 * of open files... ]
202 */
203 lim = p->p_rlimit[RLIMIT_NOFILE].rlim_cur;
204 fdp = p->p_fd;
205 last = min(fdp->fd_nfiles, lim);
206 freefd = 0;
207 for (i = fdp->fd_freefile; i < last; i++)
208 if (fdp->fd_ofiles[i] == NULL)
209 freefd++;
210
211 /*
212 * Adjust for the fact that the fdesc array may not
213 * have been fully allocated yet.
214 */
215 if (fdp->fd_nfiles < lim)
216 freefd += (lim - fdp->fd_nfiles);
217
218 sbp->f_flags = 0;
219 sbp->f_bsize = DEV_BSIZE;
220 sbp->f_iosize = DEV_BSIZE;
221 sbp->f_blocks = 2; /* 1K to keep df happy */
222 sbp->f_bfree = 0;
223 sbp->f_bavail = 0;
224 sbp->f_files = lim + 1; /* Allow for "." */
225 sbp->f_ffree = freefd; /* See comments above */
226 if (sbp != &mp->mnt_stat) {
227 sbp->f_type = mp->mnt_vfc->vfc_typenum;
228 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
229 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
230 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
231 }
232 return (0);
233}
234
235static int
236fdesc_sync(mp, waitfor, cred, p)
237 struct mount *mp;
238 int waitfor;
239 struct ucred *cred;
240 struct proc *p;
241{
242
243 return (0);
244}
245
246#define fdesc_fhtovp ((int (*) __P((struct mount *, struct fid *, \
| 39 */
40
41/*
42 * /dev/fd Filesystem
43 */
44
45#include <sys/param.h>
46#include <sys/systm.h>
47#include <sys/kernel.h>
48#include <sys/proc.h>
49#include <sys/resourcevar.h>
50#include <sys/filedesc.h>
51#include <sys/vnode.h>
52#include <sys/mount.h>
53#include <sys/malloc.h>
54#include <miscfs/fdesc/fdesc.h>
55
56static int fdesc_fhtovp __P((struct mount *mp, struct fid *fhp,
57 struct mbuf *nam, struct vnode **vpp,
58 int *exflagsp, struct ucred **credanonp));
59static int fdesc_mount __P((struct mount *mp, char *path, caddr_t data,
60 struct nameidata *ndp, struct proc *p));
61static int fdesc_quotactl __P((struct mount *mp, int cmd, uid_t uid,
62 caddr_t arg, struct proc *p));
63static int fdesc_start __P((struct mount *mp, int flags, struct proc *p));
64static int fdesc_unmount __P((struct mount *mp, int mntflags,
65 struct proc *p));
66static int fdesc_statfs __P((struct mount *mp, struct statfs *sbp,
67 struct proc *p));
68static int fdesc_sync __P((struct mount *mp, int waitfor,
69 struct ucred *cred, struct proc *p));
70static int fdesc_vget __P((struct mount *mp, ino_t ino,
71 struct vnode **vpp));
72static int fdesc_vptofh __P((struct vnode *vp, struct fid *fhp));
73
74/*
75 * Mount the per-process file descriptors (/dev/fd)
76 */
77static int
78fdesc_mount(mp, path, data, ndp, p)
79 struct mount *mp;
80 char *path;
81 caddr_t data;
82 struct nameidata *ndp;
83 struct proc *p;
84{
85 int error = 0;
86 u_int size;
87 struct fdescmount *fmp;
88 struct vnode *rvp;
89
90 /*
91 * Update is a no-op
92 */
93 if (mp->mnt_flag & MNT_UPDATE)
94 return (EOPNOTSUPP);
95
96 error = fdesc_allocvp(Froot, FD_ROOT, mp, &rvp);
97 if (error)
98 return (error);
99
100 MALLOC(fmp, struct fdescmount *, sizeof(struct fdescmount),
101 M_UFSMNT, M_WAITOK); /* XXX */
102 rvp->v_type = VDIR;
103 rvp->v_flag |= VROOT;
104 fmp->f_root = rvp;
105 /* XXX -- don't mark as local to work around fts() problems */
106 /*mp->mnt_flag |= MNT_LOCAL;*/
107 mp->mnt_data = (qaddr_t) fmp;
108 vfs_getnewfsid(mp);
109
110 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
111 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
112 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
113 bcopy("fdesc", mp->mnt_stat.f_mntfromname, sizeof("fdesc"));
114 (void)fdesc_statfs(mp, &mp->mnt_stat, p);
115 return (0);
116}
117
118static int
119fdesc_start(mp, flags, p)
120 struct mount *mp;
121 int flags;
122 struct proc *p;
123{
124 return (0);
125}
126
127static int
128fdesc_unmount(mp, mntflags, p)
129 struct mount *mp;
130 int mntflags;
131 struct proc *p;
132{
133 int error;
134 int flags = 0;
135 struct vnode *rootvp = VFSTOFDESC(mp)->f_root;
136
137 if (mntflags & MNT_FORCE)
138 flags |= FORCECLOSE;
139
140 /*
141 * Clear out buffer cache. I don't think we
142 * ever get anything cached at this level at the
143 * moment, but who knows...
144 */
145 if (rootvp->v_usecount > 1)
146 return (EBUSY);
147 if (error = vflush(mp, rootvp, flags))
148 return (error);
149
150 /*
151 * Release reference on underlying root vnode
152 */
153 vrele(rootvp);
154 /*
155 * And blow it away for future re-use
156 */
157 vgone(rootvp);
158 /*
159 * Finally, throw away the fdescmount structure
160 */
161 free(mp->mnt_data, M_UFSMNT); /* XXX */
162 mp->mnt_data = 0;
163
164 return (0);
165}
166
167int
168fdesc_root(mp, vpp)
169 struct mount *mp;
170 struct vnode **vpp;
171{
172 struct proc *p = curproc; /* XXX */
173 struct vnode *vp;
174
175 /*
176 * Return locked reference to root.
177 */
178 vp = VFSTOFDESC(mp)->f_root;
179 VREF(vp);
180 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
181 *vpp = vp;
182 return (0);
183}
184
185static int
186fdesc_statfs(mp, sbp, p)
187 struct mount *mp;
188 struct statfs *sbp;
189 struct proc *p;
190{
191 struct filedesc *fdp;
192 int lim;
193 int i;
194 int last;
195 int freefd;
196
197 /*
198 * Compute number of free file descriptors.
199 * [ Strange results will ensue if the open file
200 * limit is ever reduced below the current number
201 * of open files... ]
202 */
203 lim = p->p_rlimit[RLIMIT_NOFILE].rlim_cur;
204 fdp = p->p_fd;
205 last = min(fdp->fd_nfiles, lim);
206 freefd = 0;
207 for (i = fdp->fd_freefile; i < last; i++)
208 if (fdp->fd_ofiles[i] == NULL)
209 freefd++;
210
211 /*
212 * Adjust for the fact that the fdesc array may not
213 * have been fully allocated yet.
214 */
215 if (fdp->fd_nfiles < lim)
216 freefd += (lim - fdp->fd_nfiles);
217
218 sbp->f_flags = 0;
219 sbp->f_bsize = DEV_BSIZE;
220 sbp->f_iosize = DEV_BSIZE;
221 sbp->f_blocks = 2; /* 1K to keep df happy */
222 sbp->f_bfree = 0;
223 sbp->f_bavail = 0;
224 sbp->f_files = lim + 1; /* Allow for "." */
225 sbp->f_ffree = freefd; /* See comments above */
226 if (sbp != &mp->mnt_stat) {
227 sbp->f_type = mp->mnt_vfc->vfc_typenum;
228 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
229 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
230 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
231 }
232 return (0);
233}
234
235static int
236fdesc_sync(mp, waitfor, cred, p)
237 struct mount *mp;
238 int waitfor;
239 struct ucred *cred;
240 struct proc *p;
241{
242
243 return (0);
244}
245
246#define fdesc_fhtovp ((int (*) __P((struct mount *, struct fid *, \
|
248#define fdesc_quotactl ((int (*) __P((struct mount *, int, uid_t, caddr_t, \
249 struct proc *)))eopnotsupp)
250#define fdesc_sysctl ((int (*) __P((int *, u_int, void *, size_t *, void *, \
251 size_t, struct proc *)))eopnotsupp)
252#define fdesc_vget ((int (*) __P((struct mount *, ino_t, struct vnode **))) \
253 eopnotsupp)
254#define fdesc_vptofh ((int (*) __P((struct vnode *, struct fid *)))eopnotsupp)
255
256static struct vfsops fdesc_vfsops = {
257 fdesc_mount,
258 fdesc_start,
259 fdesc_unmount,
260 fdesc_root,
261 fdesc_quotactl,
262 fdesc_statfs,
263 fdesc_sync,
264 fdesc_vget,
265 fdesc_fhtovp,
266 fdesc_vptofh,
267 fdesc_init,
268};
269
270VFS_SET(fdesc_vfsops, fdesc, MOUNT_FDESC, VFCF_SYNTHETIC);
| 248#define fdesc_quotactl ((int (*) __P((struct mount *, int, uid_t, caddr_t, \
249 struct proc *)))eopnotsupp)
250#define fdesc_sysctl ((int (*) __P((int *, u_int, void *, size_t *, void *, \
251 size_t, struct proc *)))eopnotsupp)
252#define fdesc_vget ((int (*) __P((struct mount *, ino_t, struct vnode **))) \
253 eopnotsupp)
254#define fdesc_vptofh ((int (*) __P((struct vnode *, struct fid *)))eopnotsupp)
255
256static struct vfsops fdesc_vfsops = {
257 fdesc_mount,
258 fdesc_start,
259 fdesc_unmount,
260 fdesc_root,
261 fdesc_quotactl,
262 fdesc_statfs,
263 fdesc_sync,
264 fdesc_vget,
265 fdesc_fhtovp,
266 fdesc_vptofh,
267 fdesc_init,
268};
269
270VFS_SET(fdesc_vfsops, fdesc, MOUNT_FDESC, VFCF_SYNTHETIC);
|