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1.1 root 1: /*
2: * Copyright (c) 1990, 1992 Jan-Simon Pendry
3: * All rights reserved.
4: *
5: * This code is derived from software contributed 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: * $Id: kernfs_vfsops.c,v 1.4 1993/03/27 02:00:45 cgd Exp $
37: */
38:
39: /*
40: * Kernel params Filesystem
41: */
42:
43: #include "param.h"
44: #include "systm.h"
45: #include "time.h"
46: #include "types.h"
47: #include "proc.h"
48: #include "vnode.h"
49: #include "mount.h"
50: #include "namei.h"
51: #include "malloc.h"
52: #include "conf.h"
53: #include "miscfs/kernfs/kernfs.h"
54:
55: /* bring in the spec vnodeops for cdevvp */
56: extern struct vnodeops spec_vnodeops;
57:
58: struct vnode *rrootdevvp;
59:
60: /*
61: * cdevvp:
62: * get a character device node.
63: * this is used a few places in the miscfs routines.
64: *
65: * copied from the bdevvp in kern/vfs_subr.c
66: */
67: cdevvp(dev, vpp)
68: dev_t dev;
69: struct vnode **vpp;
70: {
71: register struct vnode *vp;
72: struct vnode *nvp;
73: int error;
74:
75: if (dev == NODEV)
76: return (0);
77: error = getnewvnode(VT_NON, (struct mount *)0, &spec_vnodeops, &nvp);
78: if (error) {
79: *vpp = 0;
80: return (error);
81: }
82: vp = nvp;
83: vp->v_type = VCHR;
84: if (nvp = checkalias(vp, dev, (struct mount *)0)) {
85: vput(vp);
86: vp = nvp;
87: }
88: *vpp = vp;
89: return (0);
90: }
91:
92: kernfs_init()
93: {
94: int error, bmaj, cmaj;
95:
96: #ifdef KERNFS_DIAGNOSTIC
97: printf("kernfs_init\n"); /* printed during system boot */
98: #endif
99:
100: bmaj = major(rootdev);
101:
102: /* hunt for the raw root device by looking in cdevsw for a matching
103: * open routine...
104: */
105: for (cmaj = 0; cmaj < nchrdev; cmaj++) {
106: if (cdevsw[cmaj].d_open == bdevsw[bmaj].d_open) {
107: dev_t cdev = makedev(cmaj, minor(rootdev));
108: error = cdevvp(cdev, &rrootdevvp);
109: if (error == 0)
110: break;
111: }
112: }
113:
114: /* this isn't fatal... */
115: if (error) {
116: printf("kernfs: no raw boot device\n");
117: rrootdevvp = 0;
118: }
119: }
120:
121: /*
122: * Mount the kernel parameter filesystem
123: */
124: kernfs_mount(mp, path, data, ndp, p)
125: struct mount *mp;
126: char *path;
127: caddr_t data;
128: struct nameidata *ndp;
129: struct proc *p;
130: {
131: int error = 0;
132: u_int size;
133: struct kernfs_mount *fmp;
134: struct vnode *rvp;
135:
136: #ifdef KERNFS_DIAGNOSTIC
137: printf("kernfs_mount(mp = %x)\n", mp);
138: #endif
139:
140: /*
141: * Update is a no-op
142: */
143: if (mp->mnt_flag & MNT_UPDATE)
144: return (EOPNOTSUPP);
145:
146: error = getnewvnode(VT_UFS, mp, &kernfs_vnodeops, &rvp); /* XXX */
147: if (error)
148: return (error);
149:
150: fmp = (struct kernfs_mount *) malloc(sizeof(struct kernfs_mount),
151: M_UFSMNT, M_WAITOK); /* XXX */
152: rvp->v_type = VDIR;
153: rvp->v_flag |= VROOT;
154: #ifdef KERNFS_DIAGNOSTIC
155: printf("kernfs_mount: root vp = %x\n", rvp);
156: #endif
157: fmp->kf_root = rvp;
158: mp->mnt_flag |= MNT_LOCAL;
159: mp->mnt_data = (qaddr_t) fmp;
160: getnewfsid(mp, MOUNT_KERNFS);
161:
162: (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
163: bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
164: bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
165: bcopy("kernfs", mp->mnt_stat.f_mntfromname, sizeof("kernfs"));
166: #ifdef KERNFS_DIAGNOSTIC
167: printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname);
168: #endif
169: return (0);
170: }
171:
172: kernfs_start(mp, flags, p)
173: struct mount *mp;
174: int flags;
175: struct proc *p;
176: {
177: return (0);
178: }
179:
180: kernfs_unmount(mp, mntflags, p)
181: struct mount *mp;
182: int mntflags;
183: struct proc *p;
184: {
185: int error;
186: int flags = 0;
187: extern int doforce;
188: struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root;
189:
190: #ifdef KERNFS_DIAGNOSTIC
191: printf("kernfs_unmount(mp = %x)\n", mp);
192: #endif
193:
194: if (mntflags & MNT_FORCE) {
195: /* kernfs can never be rootfs so don't check for it */
196: if (!doforce)
197: return (EINVAL);
198: flags |= FORCECLOSE;
199: }
200:
201: /*
202: * Clear out buffer cache. I don't think we
203: * ever get anything cached at this level at the
204: * moment, but who knows...
205: */
206: #ifdef KERNFS_DIAGNOSTIC
207: printf("kernfs_unmount: calling mntflushbuf\n");
208: #endif
209: mntflushbuf(mp, 0);
210: #ifdef KERNFS_DIAGNOSTIC
211: printf("kernfs_unmount: calling mntinvalbuf\n");
212: #endif
213: if (mntinvalbuf(mp, 1))
214: return (EBUSY);
215: if (rootvp->v_usecount > 1)
216: return (EBUSY);
217: #ifdef KERNFS_DIAGNOSTIC
218: printf("kernfs_unmount: calling vflush\n");
219: #endif
220: if (error = vflush(mp, rootvp, flags))
221: return (error);
222:
223: #ifdef KERNFS_DIAGNOSTIC
224: vprint("kernfs root", rootvp);
225: #endif
226: /*
227: * Release reference on underlying root vnode
228: */
229: vrele(rootvp);
230: /*
231: * And blow it away for future re-use
232: */
233: vgone(rootvp);
234: /*
235: * Finally, throw away the kernfs_mount structure
236: */
237: free(mp->mnt_data, M_UFSMNT); /* XXX */
238: mp->mnt_data = 0;
239: return 0;
240: }
241:
242: kernfs_root(mp, vpp)
243: struct mount *mp;
244: struct vnode **vpp;
245: {
246: struct vnode *vp;
247: int error;
248:
249: #ifdef KERNFS_DIAGNOSTIC
250: printf("kernfs_root(mp = %x)\n", mp);
251: #endif
252:
253: /*
254: * Return locked reference to root.
255: */
256: vp = VFSTOKERNFS(mp)->kf_root;
257: VREF(vp);
258: VOP_LOCK(vp);
259: *vpp = vp;
260: return (0);
261: }
262:
263: kernfs_quotactl(mp, cmd, uid, arg, p)
264: struct mount *mp;
265: int cmd;
266: uid_t uid;
267: caddr_t arg;
268: struct proc *p;
269: {
270: return (EOPNOTSUPP);
271: }
272:
273: kernfs_statfs(mp, sbp, p)
274: struct mount *mp;
275: struct statfs *sbp;
276: struct proc *p;
277: {
278: struct filedesc *fdp;
279: int lim;
280: int i;
281: int last;
282: int freefd;
283:
284: #ifdef KERNFS_DIAGNOSTIC
285: printf("kernfs_statfs(mp = %x)\n", mp);
286: #endif
287:
288: sbp->f_type = MOUNT_KERNFS;
289: sbp->f_flags = 0;
290: sbp->f_fsize = DEV_BSIZE;
291: sbp->f_bsize = DEV_BSIZE;
292: sbp->f_blocks = 2; /* 1K to keep df happy */
293: sbp->f_bfree = 0;
294: sbp->f_bavail = 0;
295: sbp->f_files = 0; /* Allow for "." */
296: sbp->f_ffree = 0; /* See comments above */
297: if (sbp != &mp->mnt_stat) {
298: bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
299: bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
300: bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
301: }
302: return (0);
303: }
304:
305: kernfs_sync(mp, waitfor)
306: struct mount *mp;
307: int waitfor;
308: {
309: return (0);
310: }
311:
312: kernfs_fhtovp(mp, fhp, vpp)
313: struct mount *mp;
314: struct fid *fhp;
315: struct vnode **vpp;
316: {
317: return (EOPNOTSUPP);
318: }
319:
320: kernfs_vptofh(vp, fhp)
321: struct vnode *vp;
322: struct fid *fhp;
323: {
324: return (EOPNOTSUPP);
325: }
326:
327: struct vfsops kernfs_vfsops = {
328: kernfs_mount,
329: kernfs_start,
330: kernfs_unmount,
331: kernfs_root,
332: kernfs_quotactl,
333: kernfs_statfs,
334: kernfs_sync,
335: kernfs_fhtovp,
336: kernfs_vptofh,
337: kernfs_init,
338: };
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