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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: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
23: /*
24: * Copyright (c) 1992, 1993, 1995
25: * The Regents of the University of California. All rights reserved.
26: *
27: * This code is derived from software donated to Berkeley by
28: * Jan-Simon Pendry.
29: *
30: * Redistribution and use in source and binary forms, with or without
31: * modification, are permitted provided that the following conditions
32: * are met:
33: * 1. Redistributions of source code must retain the above copyright
34: * notice, this list of conditions and the following disclaimer.
35: * 2. Redistributions in binary form must reproduce the above copyright
36: * notice, this list of conditions and the following disclaimer in the
37: * documentation and/or other materials provided with the distribution.
38: * 3. All advertising materials mentioning features or use of this software
39: * must display the following acknowledgement:
40: * This product includes software developed by the University of
41: * California, Berkeley and its contributors.
42: * 4. Neither the name of the University nor the names of its contributors
43: * may be used to endorse or promote products derived from this software
44: * without specific prior written permission.
45: *
46: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
47: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
48: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
49: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
50: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
51: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
52: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
53: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
54: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
55: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
56: * SUCH DAMAGE.
57: *
58: * @(#)fdesc_vfsops.c 8.10 (Berkeley) 5/14/95
59: *
60: */
61:
62: /*
63: * /dev/fd Filesystem
64: */
65:
66: #include <sys/param.h>
67: #include <sys/systm.h>
68: #include <sys/time.h>
69: #include <sys/types.h>
70: #include <sys/proc.h>
71: #include <sys/resourcevar.h>
72: #include <sys/filedesc.h>
73: #include <sys/vnode.h>
74: #include <sys/mount.h>
75: #include <sys/namei.h>
76: #include <sys/malloc.h>
77: #include <miscfs/fdesc/fdesc.h>
78:
79: /*
80: * Mount the per-process file descriptors (/dev/fd)
81: */
82: int
83: fdesc_mount(mp, path, data, ndp, p)
84: struct mount *mp;
85: char *path;
86: caddr_t data;
87: struct nameidata *ndp;
88: struct proc *p;
89: {
90: int error = 0;
91: u_int size;
92: struct fdescmount *fmp;
93: struct vnode *rvp;
94:
95: /*
96: * Update is a no-op
97: */
98: if (mp->mnt_flag & MNT_UPDATE)
99: return (EOPNOTSUPP);
100:
101: error = fdesc_allocvp(Froot, FD_ROOT, mp, &rvp);
102: if (error)
103: return (error);
104:
105: MALLOC(fmp, struct fdescmount *, sizeof(struct fdescmount),
106: M_UFSMNT, M_WAITOK); /* XXX */
107: rvp->v_type = VDIR;
108: rvp->v_flag |= VROOT;
109: fmp->f_root = rvp;
110: /* XXX -- don't mark as local to work around fts() problems */
111: /*mp->mnt_flag |= MNT_LOCAL;*/
112: mp->mnt_data = (qaddr_t) fmp;
113: vfs_getnewfsid(mp);
114:
115: (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
116: bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
117: bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
118: bcopy("fdesc", mp->mnt_stat.f_mntfromname, sizeof("fdesc"));
119: return (0);
120: }
121:
122: int
123: fdesc_start(mp, flags, p)
124: struct mount *mp;
125: int flags;
126: struct proc *p;
127: {
128: return (0);
129: }
130:
131: int
132: fdesc_unmount(mp, mntflags, p)
133: struct mount *mp;
134: int mntflags;
135: struct proc *p;
136: {
137: int error;
138: int flags = 0;
139: struct vnode *rootvp = VFSTOFDESC(mp)->f_root;
140:
141: if (mntflags & MNT_FORCE)
142: flags |= FORCECLOSE;
143:
144: /*
145: * Clear out buffer cache. I don't think we
146: * ever get anything cached at this level at the
147: * moment, but who knows...
148: */
149: if (rootvp->v_usecount > 1)
150: return (EBUSY);
151: if (error = vflush(mp, rootvp, flags))
152: return (error);
153:
154: /*
155: * Release reference on underlying root vnode
156: */
157: vrele(rootvp);
158: /*
159: * And blow it away for future re-use
160: */
161: vgone(rootvp);
162: /*
163: * Finally, throw away the fdescmount structure
164: */
165: _FREE(mp->mnt_data, M_UFSMNT); /* XXX */
166: mp->mnt_data = 0;
167:
168: return (0);
169: }
170:
171: int
172: fdesc_root(mp, vpp)
173: struct mount *mp;
174: struct vnode **vpp;
175: {
176: struct proc *p = current_proc(); /* XXX */
177: struct vnode *vp;
178:
179: /*
180: * Return locked reference to root.
181: */
182: vp = VFSTOFDESC(mp)->f_root;
183: VREF(vp);
184: vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
185: *vpp = vp;
186: return (0);
187: }
188:
189: int
190: fdesc_statfs(mp, sbp, p)
191: struct mount *mp;
192: struct statfs *sbp;
193: struct proc *p;
194: {
195: struct filedesc *fdp;
196: int lim;
197: int i;
198: int last;
199: int freefd;
200:
201: /*
202: * Compute number of free file descriptors.
203: * [ Strange results will ensue if the open file
204: * limit is ever reduced below the current number
205: * of open files... ]
206: */
207: lim = p->p_rlimit[RLIMIT_NOFILE].rlim_cur;
208: fdp = p->p_fd;
209: last = min(fdp->fd_nfiles, lim);
210: freefd = 0;
211: for (i = fdp->fd_freefile; i < last; i++)
212: if (fdp->fd_ofiles[i] == NULL &&
213: !(fdp->fd_ofileflags[i] & UF_RESERVED))
214: freefd++;
215:
216: /*
217: * Adjust for the fact that the fdesc array may not
218: * have been fully allocated yet.
219: */
220: if (fdp->fd_nfiles < lim)
221: freefd += (lim - fdp->fd_nfiles);
222:
223: sbp->f_flags = 0;
224: sbp->f_bsize = DEV_BSIZE;
225: sbp->f_iosize = DEV_BSIZE;
226: sbp->f_blocks = 2; /* 1K to keep df happy */
227: sbp->f_bfree = 0;
228: sbp->f_bavail = 0;
229: sbp->f_files = lim + 1; /* Allow for "." */
230: sbp->f_ffree = freefd; /* See comments above */
231: if (sbp != &mp->mnt_stat) {
232: sbp->f_type = mp->mnt_vfc->vfc_typenum;
233: bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
234: bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
235: bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
236: }
237: return (0);
238: }
239:
240: int
241: fdesc_sync(mp, waitfor)
242: struct mount *mp;
243: int waitfor;
244: {
245:
246: return (0);
247: }
248:
249: #define fdesc_fhtovp ((int (*) __P((struct mount *, struct fid *, \
250: struct mbuf *, struct vnode **, int *, struct ucred **)))eopnotsupp)
251: #define fdesc_quotactl ((int (*) __P((struct mount *, int, uid_t, caddr_t, \
252: struct proc *)))eopnotsupp)
253: #define fdesc_sysctl ((int (*) __P((int *, u_int, void *, size_t *, void *, \
254: size_t, struct proc *)))eopnotsupp)
255: #define fdesc_vget ((int (*) __P((struct mount *, ino_t, struct vnode **))) \
256: eopnotsupp)
257: #define fdesc_vptofh ((int (*) __P((struct vnode *, struct fid *)))eopnotsupp)
258:
259: struct vfsops fdesc_vfsops = {
260: fdesc_mount,
261: fdesc_start,
262: fdesc_unmount,
263: fdesc_root,
264: fdesc_quotactl,
265: fdesc_statfs,
266: fdesc_sync,
267: fdesc_vget,
268: fdesc_fhtovp,
269: fdesc_vptofh,
270: fdesc_init,
271: fdesc_sysctl,
272: };
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