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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: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
26: /*
27: * Copyright (c) 1992, 1993, 1995
28: * The Regents of the University of California. All rights reserved.
29: *
30: * This code is derived from software donated to Berkeley by
31: * Jan-Simon Pendry.
32: *
33: * Redistribution and use in source and binary forms, with or without
34: * modification, are permitted provided that the following conditions
35: * are met:
36: * 1. Redistributions of source code must retain the above copyright
37: * notice, this list of conditions and the following disclaimer.
38: * 2. Redistributions in binary form must reproduce the above copyright
39: * notice, this list of conditions and the following disclaimer in the
40: * documentation and/or other materials provided with the distribution.
41: * 3. All advertising materials mentioning features or use of this software
42: * must display the following acknowledgement:
43: * This product includes software developed by the University of
44: * California, Berkeley and its contributors.
45: * 4. Neither the name of the University nor the names of its contributors
46: * may be used to endorse or promote products derived from this software
47: * without specific prior written permission.
48: *
49: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
50: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
53: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
54: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
56: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
57: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
58: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
59: * SUCH DAMAGE.
60: *
61: * @(#)fdesc_vfsops.c 8.10 (Berkeley) 5/14/95
62: *
63: */
64:
65: /*
66: * /dev/fd Filesystem
67: */
68:
69: #include <sys/param.h>
70: #include <sys/systm.h>
71: #include <sys/time.h>
72: #include <sys/types.h>
73: #include <sys/proc.h>
74: #include <sys/resourcevar.h>
75: #include <sys/filedesc.h>
76: #include <sys/vnode.h>
77: #include <sys/mount.h>
78: #include <sys/namei.h>
79: #include <sys/malloc.h>
80: #include <miscfs/fdesc/fdesc.h>
81:
82: /*
83: * Mount the per-process file descriptors (/dev/fd)
84: */
85: int
86: fdesc_mount(mp, path, data, ndp, p)
87: struct mount *mp;
88: char *path;
89: caddr_t data;
90: struct nameidata *ndp;
91: struct proc *p;
92: {
93: int error = 0;
94: u_int size;
95: struct fdescmount *fmp;
96: struct vnode *rvp;
97:
98: /*
99: * Update is a no-op
100: */
101: if (mp->mnt_flag & MNT_UPDATE)
102: return (EOPNOTSUPP);
103:
104: error = fdesc_allocvp(Froot, FD_ROOT, mp, &rvp);
105: if (error)
106: return (error);
107:
108: MALLOC(fmp, struct fdescmount *, sizeof(struct fdescmount),
109: M_UFSMNT, M_WAITOK); /* XXX */
110: rvp->v_type = VDIR;
111: rvp->v_flag |= VROOT;
112: fmp->f_root = rvp;
113: /* XXX -- don't mark as local to work around fts() problems */
114: /*mp->mnt_flag |= MNT_LOCAL;*/
115: mp->mnt_data = (qaddr_t) fmp;
116: vfs_getnewfsid(mp);
117:
118: (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
119: bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
120: bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
121: bcopy("fdesc", mp->mnt_stat.f_mntfromname, sizeof("fdesc"));
122: return (0);
123: }
124:
125: int
126: fdesc_start(mp, flags, p)
127: struct mount *mp;
128: int flags;
129: struct proc *p;
130: {
131: return (0);
132: }
133:
134: int
135: fdesc_unmount(mp, mntflags, p)
136: struct mount *mp;
137: int mntflags;
138: struct proc *p;
139: {
140: int error;
141: int flags = 0;
142: struct vnode *rootvp = VFSTOFDESC(mp)->f_root;
143:
144: if (mntflags & MNT_FORCE)
145: flags |= FORCECLOSE;
146:
147: /*
148: * Clear out buffer cache. I don't think we
149: * ever get anything cached at this level at the
150: * moment, but who knows...
151: */
152: if (rootvp->v_usecount > 1)
153: return (EBUSY);
154: if (error = vflush(mp, rootvp, flags))
155: return (error);
156:
157: /*
158: * Release reference on underlying root vnode
159: */
160: vrele(rootvp);
161: /*
162: * And blow it away for future re-use
163: */
164: vgone(rootvp);
165: /*
166: * Finally, throw away the fdescmount structure
167: */
168: _FREE(mp->mnt_data, M_UFSMNT); /* XXX */
169: mp->mnt_data = 0;
170:
171: return (0);
172: }
173:
174: int
175: fdesc_root(mp, vpp)
176: struct mount *mp;
177: struct vnode **vpp;
178: {
179: struct proc *p = current_proc(); /* XXX */
180: struct vnode *vp;
181:
182: /*
183: * Return locked reference to root.
184: */
185: vp = VFSTOFDESC(mp)->f_root;
186: VREF(vp);
187: vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
188: *vpp = vp;
189: return (0);
190: }
191:
192: int
193: fdesc_statfs(mp, sbp, p)
194: struct mount *mp;
195: struct statfs *sbp;
196: struct proc *p;
197: {
198: struct filedesc *fdp;
199: int lim;
200: int i;
201: int last;
202: int freefd;
203:
204: /*
205: * Compute number of free file descriptors.
206: * [ Strange results will ensue if the open file
207: * limit is ever reduced below the current number
208: * of open files... ]
209: */
210: lim = p->p_rlimit[RLIMIT_NOFILE].rlim_cur;
211: fdp = p->p_fd;
212: last = min(fdp->fd_nfiles, lim);
213: freefd = 0;
214: for (i = fdp->fd_freefile; i < last; i++)
215: if (fdp->fd_ofiles[i] == NULL &&
216: !(fdp->fd_ofileflags[i] & UF_RESERVED))
217: freefd++;
218:
219: /*
220: * Adjust for the fact that the fdesc array may not
221: * have been fully allocated yet.
222: */
223: if (fdp->fd_nfiles < lim)
224: freefd += (lim - fdp->fd_nfiles);
225:
226: sbp->f_flags = 0;
227: sbp->f_bsize = DEV_BSIZE;
228: sbp->f_iosize = DEV_BSIZE;
229: sbp->f_blocks = 2; /* 1K to keep df happy */
230: sbp->f_bfree = 0;
231: sbp->f_bavail = 0;
232: sbp->f_files = lim + 1; /* Allow for "." */
233: sbp->f_ffree = freefd; /* See comments above */
234: if (sbp != &mp->mnt_stat) {
235: sbp->f_type = mp->mnt_vfc->vfc_typenum;
236: bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
237: bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
238: bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
239: }
240: return (0);
241: }
242:
243: int
244: fdesc_sync(mp, waitfor)
245: struct mount *mp;
246: int waitfor;
247: {
248:
249: return (0);
250: }
251:
252: #define fdesc_fhtovp ((int (*) __P((struct mount *, struct fid *, \
253: struct mbuf *, struct vnode **, int *, struct ucred **)))eopnotsupp)
254: #define fdesc_quotactl ((int (*) __P((struct mount *, int, uid_t, caddr_t, \
255: struct proc *)))eopnotsupp)
256: #define fdesc_sysctl ((int (*) __P((int *, u_int, void *, size_t *, void *, \
257: size_t, struct proc *)))eopnotsupp)
258: #define fdesc_vget ((int (*) __P((struct mount *, ino_t, struct vnode **))) \
259: eopnotsupp)
260: #define fdesc_vptofh ((int (*) __P((struct vnode *, struct fid *)))eopnotsupp)
261:
262: struct vfsops fdesc_vfsops = {
263: fdesc_mount,
264: fdesc_start,
265: fdesc_unmount,
266: fdesc_root,
267: fdesc_quotactl,
268: fdesc_statfs,
269: fdesc_sync,
270: fdesc_vget,
271: fdesc_fhtovp,
272: fdesc_vptofh,
273: fdesc_init,
274: fdesc_sysctl,
275: };
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