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1.1 root 1: /*
2: * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * The contents of this file constitute Original Code as defined in and
7: * are subject to the Apple Public Source License Version 1.1 (the
8: * "License"). You may not use this file except in compliance with the
9: * License. Please obtain a copy of the License at
10: * http://www.apple.com/publicsource and read it before using this file.
11: *
12: * This Original Code and all software distributed under the License are
13: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17: * License for the specific language governing rights and limitations
18: * under the License.
19: *
20: * @APPLE_LICENSE_HEADER_END@
21: */
22: /* $NetBSD: kernfs_vfsops.c,v 1.23 1995/03/09 12:05:52 mycroft Exp $ */
23:
24: /*
25: * Copyright (c) 1992, 1993
26: * The Regents of the University of California. All rights reserved.
27: *
28: * This code is derived from software donated to Berkeley by
29: * Jan-Simon Pendry.
30: *
31: * Redistribution and use in source and binary forms, with or without
32: * modification, are permitted provided that the following conditions
33: * are met:
34: * 1. Redistributions of source code must retain the above copyright
35: * notice, this list of conditions and the following disclaimer.
36: * 2. Redistributions in binary form must reproduce the above copyright
37: * notice, this list of conditions and the following disclaimer in the
38: * documentation and/or other materials provided with the distribution.
39: * 3. All advertising materials mentioning features or use of this software
40: * must display the following acknowledgement:
41: * This product includes software developed by the University of
42: * California, Berkeley and its contributors.
43: * 4. Neither the name of the University nor the names of its contributors
44: * may be used to endorse or promote products derived from this software
45: * without specific prior written permission.
46: *
47: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
48: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
49: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
50: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
51: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
52: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
53: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
54: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
55: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
56: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
57: * SUCH DAMAGE.
58: *
59: * @(#)kernfs_vfsops.c 8.5 (Berkeley) 6/15/94
60: */
61:
62: /*
63: * Kernel params Filesystem
64: */
65:
66: #include <sys/param.h>
67: #include <sys/systm.h>
68: #include <sys/conf.h>
69: #include <sys/types.h>
70: #include <sys/proc.h>
71: #include <sys/vnode.h>
72: #include <sys/mount.h>
73: #include <sys/namei.h>
74: #include <sys/malloc.h>
75:
76: #include <miscfs/specfs/specdev.h>
77: #include <miscfs/kernfs/kernfs.h>
78:
79: dev_t rrootdev = NODEV;
80:
81: kernfs_init()
82: {
83:
84: }
85:
86: void
87: kernfs_get_rrootdev()
88: {
89: static int tried = 0;
90: int cmaj;
91:
92: if (tried) {
93: /* Already did it once. */
94: return;
95: }
96: tried = 1;
97:
98: if (rootdev == NODEV)
99: return;
100: for (cmaj = 0; cmaj < nchrdev; cmaj++) {
101: rrootdev = makedev(cmaj, minor(rootdev));
102: if (chrtoblk(rrootdev) == rootdev)
103: return;
104: }
105: rrootdev = NODEV;
106: printf("kernfs_get_rrootdev: no raw root device\n");
107: }
108:
109: /*
110: * Mount the Kernel params filesystem
111: */
112: kernfs_mount(mp, path, data, ndp, p)
113: struct mount *mp;
114: char *path;
115: caddr_t data;
116: struct nameidata *ndp;
117: struct proc *p;
118: {
119: int error = 0;
120: size_t size;
121: struct kernfs_mount *fmp;
122: struct vnode *rvp;
123:
124: #ifdef KERNFS_DIAGNOSTIC
125: printf("kernfs_mount(mp = %x)\n", mp);
126: #endif
127:
128: /*
129: * Update is a no-op
130: */
131: if (mp->mnt_flag & MNT_UPDATE)
132: return (EOPNOTSUPP);
133:
134: MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount),
135: M_MISCFSMNT, M_WAITOK);
136: if (error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp)) {
137: FREE(fmp, M_MISCFSMNT);
138: return (error);
139: }
140:
141: rvp->v_type = VDIR;
142: rvp->v_flag |= VROOT;
143: #ifdef KERNFS_DIAGNOSTIC
144: printf("kernfs_mount: root vp = %x\n", rvp);
145: #endif
146: fmp->kf_root = rvp;
147: mp->mnt_flag |= MNT_LOCAL;
148: mp->mnt_data = (qaddr_t)fmp;
149: getnewfsid(mp, makefstype(MOUNT_KERNFS));
150:
151: (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
152: bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
153: bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
154: bcopy("kernfs", mp->mnt_stat.f_mntfromname, sizeof("kernfs"));
155: #ifdef KERNFS_DIAGNOSTIC
156: printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname);
157: #endif
158:
159: kernfs_get_rrootdev();
160: return (0);
161: }
162:
163: kernfs_start(mp, flags, p)
164: struct mount *mp;
165: int flags;
166: struct proc *p;
167: {
168:
169: return (0);
170: }
171:
172: kernfs_unmount(mp, mntflags, p)
173: struct mount *mp;
174: int mntflags;
175: struct proc *p;
176: {
177: int error;
178: int flags = 0;
179: extern int doforce;
180: struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root;
181:
182: #ifdef KERNFS_DIAGNOSTIC
183: printf("kernfs_unmount(mp = %x)\n", mp);
184: #endif
185:
186: if (mntflags & MNT_FORCE) {
187: /* kernfs can never be rootfs so don't check for it */
188: if (!doforce)
189: return (EINVAL);
190: flags |= FORCECLOSE;
191: }
192:
193: /*
194: * Clear out buffer cache. I don't think we
195: * ever get anything cached at this level at the
196: * moment, but who knows...
197: */
198: if (rootvp->v_usecount > 1)
199: return (EBUSY);
200: #ifdef KERNFS_DIAGNOSTIC
201: printf("kernfs_unmount: calling vflush\n");
202: #endif
203: if (error = vflush(mp, rootvp, flags))
204: return (error);
205:
206: #ifdef KERNFS_DIAGNOSTIC
207: vprint("kernfs root", rootvp);
208: #endif
209: /*
210: * Clean out the old root vnode for reuse.
211: */
212: vrele(rootvp);
213: vgone(rootvp);
214: /*
215: * Finally, throw away the kernfs_mount structure
216: */
217: free(mp->mnt_data, M_MISCFSMNT);
218: mp->mnt_data = 0;
219: return (0);
220: }
221:
222: kernfs_root(mp, vpp)
223: struct mount *mp;
224: struct vnode **vpp;
225: {
226: struct vnode *vp;
227:
228: #ifdef KERNFS_DIAGNOSTIC
229: printf("kernfs_root(mp = %x)\n", mp);
230: #endif
231:
232: /*
233: * Return locked reference to root.
234: */
235: vp = VFSTOKERNFS(mp)->kf_root;
236: VREF(vp);
237: VOP_LOCK(vp);
238: *vpp = vp;
239: return (0);
240: }
241:
242: kernfs_quotactl(mp, cmd, uid, arg, p)
243: struct mount *mp;
244: int cmd;
245: uid_t uid;
246: caddr_t arg;
247: struct proc *p;
248: {
249:
250: return (EOPNOTSUPP);
251: }
252:
253: kernfs_statfs(mp, sbp, p)
254: struct mount *mp;
255: struct statfs *sbp;
256: struct proc *p;
257: {
258:
259: #ifdef KERNFS_DIAGNOSTIC
260: printf("kernfs_statfs(mp = %x)\n", mp);
261: #endif
262:
263: #ifdef COMPAT_09
264: sbp->f_type = 7;
265: #else
266: sbp->f_type = 0;
267: #endif
268: sbp->f_bsize = DEV_BSIZE;
269: sbp->f_iosize = DEV_BSIZE;
270: sbp->f_blocks = 2; /* 1K to keep df happy */
271: sbp->f_bfree = 0;
272: sbp->f_bavail = 0;
273: sbp->f_files = 0;
274: sbp->f_ffree = 0;
275: if (sbp != &mp->mnt_stat) {
276: bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
277: bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
278: bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
279: }
280: strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN);
281: sbp->f_fstypename[MFSNAMELEN] = '\0';
282: return (0);
283: }
284:
285: kernfs_sync(mp, waitfor)
286: struct mount *mp;
287: int waitfor;
288: {
289:
290: return (0);
291: }
292:
293: /*
294: * Kernfs flat namespace lookup.
295: * Currently unsupported.
296: */
297: kernfs_vget(mp, ino, vpp)
298: struct mount *mp;
299: ino_t ino;
300: struct vnode **vpp;
301: {
302:
303: return (EOPNOTSUPP);
304: }
305:
306:
307: kernfs_fhtovp(mp, fhp, setgen, vpp)
308: struct mount *mp;
309: struct fid *fhp;
310: int setgen;
311: struct vnode **vpp;
312: {
313:
314: return (EOPNOTSUPP);
315: }
316:
317: kernfs_vptofh(vp, fhp)
318: struct vnode *vp;
319: struct fid *fhp;
320: {
321:
322: return (EOPNOTSUPP);
323: }
324:
325: struct vfsops kernfs_vfsops = {
326: MOUNT_KERNFS,
327: kernfs_mount,
328: kernfs_start,
329: kernfs_unmount,
330: kernfs_root,
331: kernfs_quotactl,
332: kernfs_statfs,
333: kernfs_sync,
334: kernfs_vget,
335: kernfs_fhtovp,
336: kernfs_vptofh,
337: kernfs_init,
338: };
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