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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: fdesc_vfsops.c,v 1.2 1993/03/25 06:00:18 cgd Exp $
37: */
38:
39: /*
40: * /dev/fd 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 "resourcevar.h"
49: #include "filedesc.h"
50: #include "vnode.h"
51: #include "mount.h"
52: #include "namei.h"
53: #include "malloc.h"
54: #include "miscfs/fdesc/fdesc.h"
55:
56: static u_short fdesc_mntid;
57:
58: fdesc_init()
59: {
60: #ifdef FDESC_DIAGNOSTIC
61: printf("fdesc_init\n"); /* printed during system boot */
62: #endif
63: }
64:
65: /*
66: * Mount the per-process file descriptors (/dev/fd)
67: */
68: fdesc_mount(mp, path, data, ndp, p)
69: struct mount *mp;
70: char *path;
71: caddr_t data;
72: struct nameidata *ndp;
73: struct proc *p;
74: {
75: int error = 0;
76: u_int size;
77: struct fdescmount *fmp;
78: struct vnode *rvp;
79:
80: #ifdef FDESC_DIAGNOSTIC
81: printf("fdesc_mount(mp = %x)\n", mp);
82: #endif
83:
84: /*
85: * Update is a no-op
86: */
87: if (mp->mnt_flag & MNT_UPDATE)
88: return (EOPNOTSUPP);
89:
90: error = getnewvnode(VT_UFS, mp, &fdesc_vnodeops, &rvp); /* XXX */
91: if (error)
92: return (error);
93:
94: fmp = (struct fdescmount *) malloc(sizeof(struct fdescmount),
95: M_UFSMNT, M_WAITOK); /* XXX */
96: rvp->v_type = VDIR;
97: rvp->v_flag |= VROOT;
98: /*VTOFDESC(rvp)->f_isroot = 1;*/
99: #ifdef FDESC_DIAGNOSTIC
100: printf("fdesc_mount: root vp = %x\n", rvp);
101: #endif
102: fmp->f_root = rvp;
103: mp->mnt_flag |= MNT_LOCAL;
104: mp->mnt_data = (qaddr_t) fmp;
105: getnewfsid(mp, MOUNT_FDESC);
106:
107: (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
108: bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
109: bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
110: bcopy("fdesc", mp->mnt_stat.f_mntfromname, sizeof("fdesc"));
111: #ifdef FDESC_DIAGNOSTIC
112: printf("fdesc_mount: at %s\n", mp->mnt_stat.f_mntonname);
113: #endif
114: return (0);
115: }
116:
117: fdesc_start(mp, flags, p)
118: struct mount *mp;
119: int flags;
120: struct proc *p;
121: {
122: return (0);
123: }
124:
125: fdesc_unmount(mp, mntflags, p)
126: struct mount *mp;
127: int mntflags;
128: struct proc *p;
129: {
130: int error;
131: int flags = 0;
132: extern int doforce;
133: struct vnode *rootvp = VFSTOFDESC(mp)->f_root;
134:
135: #ifdef FDESC_DIAGNOSTIC
136: printf("fdesc_unmount(mp = %x)\n", mp);
137: #endif
138:
139: if (mntflags & MNT_FORCE) {
140: /* fdesc can never be rootfs so don't check for it */
141: if (!doforce)
142: return (EINVAL);
143: flags |= FORCECLOSE;
144: }
145:
146: /*
147: * Clear out buffer cache. I don't think we
148: * ever get anything cached at this level at the
149: * moment, but who knows...
150: */
151: #ifdef FDESC_DIAGNOSTIC
152: printf("fdesc_unmount: calling mntflushbuf\n");
153: #endif
154: mntflushbuf(mp, 0);
155: #ifdef FDESC_DIAGNOSTIC
156: printf("fdesc_unmount: calling mntinvalbuf\n");
157: #endif
158: if (mntinvalbuf(mp, 1))
159: return (EBUSY);
160: if (rootvp->v_usecount > 1)
161: return (EBUSY);
162: #ifdef FDESC_DIAGNOSTIC
163: printf("fdesc_unmount: calling vflush\n");
164: #endif
165: if (error = vflush(mp, rootvp, flags))
166: return (error);
167:
168: #ifdef FDESC_DIAGNOSTIC
169: vprint("fdesc root", rootvp);
170: #endif
171: /*
172: * Release reference on underlying root vnode
173: */
174: vrele(rootvp);
175: /*
176: * And blow it away for future re-use
177: */
178: vgone(rootvp);
179: /*
180: * Finally, throw away the fdescmount structure
181: */
182: free(mp->mnt_data, M_UFSMNT); /* XXX */
183: mp->mnt_data = 0;
184: return 0;
185: }
186:
187: fdesc_root(mp, vpp)
188: struct mount *mp;
189: struct vnode **vpp;
190: {
191: struct vnode *vp;
192: int error;
193:
194: #ifdef FDESC_DIAGNOSTIC
195: printf("fdesc_root(mp = %x)\n", mp);
196: #endif
197:
198: /*
199: * Return locked reference to root.
200: */
201: vp = VFSTOFDESC(mp)->f_root;
202: VREF(vp);
203: VOP_LOCK(vp);
204: *vpp = vp;
205: return (0);
206: }
207:
208: fdesc_quotactl(mp, cmd, uid, arg, p)
209: struct mount *mp;
210: int cmd;
211: uid_t uid;
212: caddr_t arg;
213: struct proc *p;
214: {
215: return (EOPNOTSUPP);
216: }
217:
218: fdesc_statfs(mp, sbp, p)
219: struct mount *mp;
220: struct statfs *sbp;
221: struct proc *p;
222: {
223: struct filedesc *fdp;
224: int lim;
225: int i;
226: int last;
227: int freefd;
228:
229: #ifdef FDESC_DIAGNOSTIC
230: printf("fdesc_statfs(mp = %x)\n", mp);
231: #endif
232:
233: /*
234: * Compute number of free file descriptors.
235: * [ Strange results will ensue if the open file
236: * limit is ever reduced below the current number
237: * of open files... ]
238: */
239: lim = p->p_rlimit[RLIMIT_OFILE].rlim_cur;
240: fdp = p->p_fd;
241: last = min(fdp->fd_nfiles, lim);
242: freefd = 0;
243: for (i = fdp->fd_freefile; i < last; i++)
244: if (fdp->fd_ofiles[i] == NULL)
245: freefd++;
246:
247: /*
248: * Adjust for the fact that the fdesc array may not
249: * have been fully allocated yet.
250: */
251: if (fdp->fd_nfiles < lim)
252: freefd += (lim - fdp->fd_nfiles);
253:
254: sbp->f_type = MOUNT_FDESC;
255: sbp->f_flags = 0;
256: sbp->f_fsize = DEV_BSIZE;
257: sbp->f_bsize = DEV_BSIZE;
258: sbp->f_blocks = 2; /* 1K to keep df happy */
259: sbp->f_bfree = 0;
260: sbp->f_bavail = 0;
261: sbp->f_files = lim + 1; /* Allow for "." */
262: sbp->f_ffree = freefd; /* See comments above */
263: if (sbp != &mp->mnt_stat) {
264: bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
265: bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
266: bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
267: }
268: return (0);
269: }
270:
271: fdesc_sync(mp, waitfor)
272: struct mount *mp;
273: int waitfor;
274: {
275: return (0);
276: }
277:
278: fdesc_fhtovp(mp, fhp, vpp)
279: struct mount *mp;
280: struct fid *fhp;
281: struct vnode **vpp;
282: {
283: return (EOPNOTSUPP);
284: }
285:
286: fdesc_vptofh(vp, fhp)
287: struct vnode *vp;
288: struct fid *fhp;
289: {
290: return (EOPNOTSUPP);
291: }
292:
293: struct vfsops fdesc_vfsops = {
294: fdesc_mount,
295: fdesc_start,
296: fdesc_unmount,
297: fdesc_root,
298: fdesc_quotactl,
299: fdesc_statfs,
300: fdesc_sync,
301: fdesc_fhtovp,
302: fdesc_vptofh,
303: fdesc_init,
304: };
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