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1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.1 (the "License"). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License.
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
24:
25: /* $NetBSD: kernfs_vfsops.c,v 1.23 1995/03/09 12:05:52 mycroft Exp $ */
26:
27: /*
28: * Copyright (c) 1992, 1993
29: * The Regents of the University of California. All rights reserved.
30: *
31: * This code is derived from software donated to Berkeley by
32: * Jan-Simon Pendry.
33: *
34: * Redistribution and use in source and binary forms, with or without
35: * modification, are permitted provided that the following conditions
36: * are met:
37: * 1. Redistributions of source code must retain the above copyright
38: * notice, this list of conditions and the following disclaimer.
39: * 2. Redistributions in binary form must reproduce the above copyright
40: * notice, this list of conditions and the following disclaimer in the
41: * documentation and/or other materials provided with the distribution.
42: * 3. All advertising materials mentioning features or use of this software
43: * must display the following acknowledgement:
44: * This product includes software developed by the University of
45: * California, Berkeley and its contributors.
46: * 4. Neither the name of the University nor the names of its contributors
47: * may be used to endorse or promote products derived from this software
48: * without specific prior written permission.
49: *
50: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
51: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
54: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60: * SUCH DAMAGE.
61: *
62: * @(#)kernfs_vfsops.c 8.5 (Berkeley) 6/15/94
63: */
64:
65: /*
66: * Kernel params Filesystem
67: */
68:
69: #include <sys/param.h>
70: #include <sys/systm.h>
71: #include <sys/conf.h>
72: #include <sys/types.h>
73: #include <sys/proc.h>
74: #include <sys/vnode.h>
75: #include <sys/mount.h>
76: #include <sys/namei.h>
77: #include <sys/malloc.h>
78:
79: #include <miscfs/specfs/specdev.h>
80: #include <miscfs/kernfs/kernfs.h>
81:
82: dev_t rrootdev = NODEV;
83:
84: kernfs_init()
85: {
86:
87: }
88:
89: void
90: kernfs_get_rrootdev()
91: {
92: static int tried = 0;
93: int cmaj;
94:
95: if (tried) {
96: /* Already did it once. */
97: return;
98: }
99: tried = 1;
100:
101: if (rootdev == NODEV)
102: return;
103: for (cmaj = 0; cmaj < nchrdev; cmaj++) {
104: rrootdev = makedev(cmaj, minor(rootdev));
105: if (chrtoblk(rrootdev) == rootdev)
106: return;
107: }
108: rrootdev = NODEV;
109: printf("kernfs_get_rrootdev: no raw root device\n");
110: }
111:
112: /*
113: * Mount the Kernel params filesystem
114: */
115: kernfs_mount(mp, path, data, ndp, p)
116: struct mount *mp;
117: char *path;
118: caddr_t data;
119: struct nameidata *ndp;
120: struct proc *p;
121: {
122: int error = 0;
123: size_t size;
124: struct kernfs_mount *fmp;
125: struct vnode *rvp;
126:
127: #ifdef KERNFS_DIAGNOSTIC
128: printf("kernfs_mount(mp = %x)\n", mp);
129: #endif
130:
131: /*
132: * Update is a no-op
133: */
134: if (mp->mnt_flag & MNT_UPDATE)
135: return (EOPNOTSUPP);
136:
137: if (error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp))
138: return (error);
139:
140: MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount),
141: M_MISCFSMNT, M_WAITOK);
142: rvp->v_type = VDIR;
143: rvp->v_flag |= VROOT;
144: #ifdef KERNFS_DIAGNOSTIC
145: printf("kernfs_mount: root vp = %x\n", rvp);
146: #endif
147: fmp->kf_root = rvp;
148: mp->mnt_flag |= MNT_LOCAL;
149: mp->mnt_data = (qaddr_t)fmp;
150: getnewfsid(mp, makefstype(MOUNT_KERNFS));
151:
152: (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
153: bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
154: bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
155: bcopy("kernfs", mp->mnt_stat.f_mntfromname, sizeof("kernfs"));
156: #ifdef KERNFS_DIAGNOSTIC
157: printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname);
158: #endif
159:
160: kernfs_get_rrootdev();
161: return (0);
162: }
163:
164: kernfs_start(mp, flags, p)
165: struct mount *mp;
166: int flags;
167: struct proc *p;
168: {
169:
170: return (0);
171: }
172:
173: kernfs_unmount(mp, mntflags, p)
174: struct mount *mp;
175: int mntflags;
176: struct proc *p;
177: {
178: int error;
179: int flags = 0;
180: extern int doforce;
181: struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root;
182:
183: #ifdef KERNFS_DIAGNOSTIC
184: printf("kernfs_unmount(mp = %x)\n", mp);
185: #endif
186:
187: if (mntflags & MNT_FORCE) {
188: /* kernfs can never be rootfs so don't check for it */
189: if (!doforce)
190: return (EINVAL);
191: flags |= FORCECLOSE;
192: }
193:
194: /*
195: * Clear out buffer cache. I don't think we
196: * ever get anything cached at this level at the
197: * moment, but who knows...
198: */
199: if (rootvp->v_usecount > 1)
200: return (EBUSY);
201: #ifdef KERNFS_DIAGNOSTIC
202: printf("kernfs_unmount: calling vflush\n");
203: #endif
204: if (error = vflush(mp, rootvp, flags))
205: return (error);
206:
207: #ifdef KERNFS_DIAGNOSTIC
208: vprint("kernfs root", rootvp);
209: #endif
210: /*
211: * Clean out the old root vnode for reuse.
212: */
213: vrele(rootvp);
214: vgone(rootvp);
215: /*
216: * Finally, throw away the kernfs_mount structure
217: */
218: free(mp->mnt_data, M_MISCFSMNT);
219: mp->mnt_data = 0;
220: return (0);
221: }
222:
223: kernfs_root(mp, vpp)
224: struct mount *mp;
225: struct vnode **vpp;
226: {
227: struct vnode *vp;
228:
229: #ifdef KERNFS_DIAGNOSTIC
230: printf("kernfs_root(mp = %x)\n", mp);
231: #endif
232:
233: /*
234: * Return locked reference to root.
235: */
236: vp = VFSTOKERNFS(mp)->kf_root;
237: VREF(vp);
238: VOP_LOCK(vp);
239: *vpp = vp;
240: return (0);
241: }
242:
243: kernfs_quotactl(mp, cmd, uid, arg, p)
244: struct mount *mp;
245: int cmd;
246: uid_t uid;
247: caddr_t arg;
248: struct proc *p;
249: {
250:
251: return (EOPNOTSUPP);
252: }
253:
254: kernfs_statfs(mp, sbp, p)
255: struct mount *mp;
256: struct statfs *sbp;
257: struct proc *p;
258: {
259:
260: #ifdef KERNFS_DIAGNOSTIC
261: printf("kernfs_statfs(mp = %x)\n", mp);
262: #endif
263:
264: #ifdef COMPAT_09
265: sbp->f_type = 7;
266: #else
267: sbp->f_type = 0;
268: #endif
269: sbp->f_bsize = DEV_BSIZE;
270: sbp->f_iosize = DEV_BSIZE;
271: sbp->f_blocks = 2; /* 1K to keep df happy */
272: sbp->f_bfree = 0;
273: sbp->f_bavail = 0;
274: sbp->f_files = 0;
275: sbp->f_ffree = 0;
276: if (sbp != &mp->mnt_stat) {
277: bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
278: bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
279: bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
280: }
281: strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN);
282: sbp->f_fstypename[MFSNAMELEN] = '\0';
283: return (0);
284: }
285:
286: kernfs_sync(mp, waitfor)
287: struct mount *mp;
288: int waitfor;
289: {
290:
291: return (0);
292: }
293:
294: /*
295: * Kernfs flat namespace lookup.
296: * Currently unsupported.
297: */
298: kernfs_vget(mp, ino, vpp)
299: struct mount *mp;
300: ino_t ino;
301: struct vnode **vpp;
302: {
303:
304: return (EOPNOTSUPP);
305: }
306:
307:
308: kernfs_fhtovp(mp, fhp, setgen, vpp)
309: struct mount *mp;
310: struct fid *fhp;
311: int setgen;
312: struct vnode **vpp;
313: {
314:
315: return (EOPNOTSUPP);
316: }
317:
318: kernfs_vptofh(vp, fhp)
319: struct vnode *vp;
320: struct fid *fhp;
321: {
322:
323: return (EOPNOTSUPP);
324: }
325:
326: struct vfsops kernfs_vfsops = {
327: MOUNT_KERNFS,
328: kernfs_mount,
329: kernfs_start,
330: kernfs_unmount,
331: kernfs_root,
332: kernfs_quotactl,
333: kernfs_statfs,
334: kernfs_sync,
335: kernfs_vget,
336: kernfs_fhtovp,
337: kernfs_vptofh,
338: kernfs_init,
339: };
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