proc->thread stage 4: rework the VFS and DEVICE subsystems to take thread
[dragonfly.git] / sys / vfs / portal / portal_vfsops.c
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1/*
2 * Copyright (c) 1992, 1993, 1995
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software donated 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 * @(#)portal_vfsops.c 8.11 (Berkeley) 5/14/95
37 *
38 * $FreeBSD: src/sys/miscfs/portal/portal_vfsops.c,v 1.26.2.2 2001/07/26 20:37:16 iedowse Exp $
dadab5e9 39 * $DragonFly: src/sys/vfs/portal/portal_vfsops.c,v 1.3 2003/06/25 03:55:59 dillon Exp $
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40 */
41
42/*
43 * Portal Filesystem
44 */
45
46#include <sys/param.h>
47#include <sys/systm.h>
48#include <sys/kernel.h>
49#include <sys/proc.h>
50#include <sys/filedesc.h>
51#include <sys/file.h>
52#include <sys/vnode.h>
53#include <sys/mount.h>
54#include <sys/malloc.h>
55#include <sys/socket.h>
56#include <sys/socketvar.h>
57#include <sys/protosw.h>
58#include <sys/domain.h>
59#include <miscfs/portal/portal.h>
60
61static MALLOC_DEFINE(M_PORTALFSMNT, "PORTAL mount", "PORTAL mount structure");
62
63static int portal_mount __P((struct mount *mp, char *path, caddr_t data,
dadab5e9 64 struct nameidata *ndp, struct thread *td));
984263bc 65static int portal_unmount __P((struct mount *mp, int mntflags,
dadab5e9 66 struct thread *td));
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67static int portal_root __P((struct mount *mp, struct vnode **vpp));
68static int portal_statfs __P((struct mount *mp, struct statfs *sbp,
dadab5e9 69 struct thread *td));
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70
71/*
72 * Mount the per-process file descriptors (/dev/fd)
73 */
74static int
dadab5e9 75portal_mount(mp, path, data, ndp, td)
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76 struct mount *mp;
77 char *path;
78 caddr_t data;
79 struct nameidata *ndp;
dadab5e9 80 struct thread *td;
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81{
82 struct file *fp;
83 struct portal_args args;
84 struct portalmount *fmp;
85 struct socket *so;
86 struct vnode *rvp;
87 struct portalnode *pn;
88 u_int size;
89 int error;
90
91 /*
92 * Update is a no-op
93 */
94 if (mp->mnt_flag & MNT_UPDATE)
95 return (EOPNOTSUPP);
96
97 error = copyin(data, (caddr_t) &args, sizeof(struct portal_args));
98 if (error)
99 return (error);
100
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101 KKASSERT(td->td_proc);
102 error = holdsock(td->td_proc->p_fd, args.pa_socket, &fp);
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103 if (error)
104 return (error);
105 so = (struct socket *) fp->f_data;
106 if (so->so_proto->pr_domain->dom_family != AF_UNIX) {
dadab5e9 107 fdrop(fp, td);
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108 return (ESOCKTNOSUPPORT);
109 }
110
111 MALLOC(pn, struct portalnode *, sizeof(struct portalnode),
112 M_TEMP, M_WAITOK);
113
114 MALLOC(fmp, struct portalmount *, sizeof(struct portalmount),
115 M_PORTALFSMNT, M_WAITOK); /* XXX */
116
117 error = getnewvnode(VT_PORTAL, mp, portal_vnodeop_p, &rvp); /* XXX */
118 if (error) {
119 FREE(fmp, M_PORTALFSMNT);
120 FREE(pn, M_TEMP);
dadab5e9 121 fdrop(fp, td);
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122 return (error);
123 }
124
125 rvp->v_data = pn;
126 rvp->v_type = VDIR;
127 rvp->v_flag |= VROOT;
128 VTOPORTAL(rvp)->pt_arg = 0;
129 VTOPORTAL(rvp)->pt_size = 0;
130 VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID;
131 fmp->pm_root = rvp;
132 fmp->pm_server = fp; fp->f_count++;
133
134 mp->mnt_flag |= MNT_LOCAL;
135 mp->mnt_data = (qaddr_t) fmp;
136 vfs_getnewfsid(mp);
137
138 (void)copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
139 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
140 (void)copyinstr(args.pa_config,
141 mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
142 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
143
144#ifdef notdef
145 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
146 bcopy("portal", mp->mnt_stat.f_mntfromname, sizeof("portal"));
147#endif
148
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149 (void)portal_statfs(mp, &mp->mnt_stat, td);
150 fdrop(fp, td);
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151 return (0);
152}
153
154static int
dadab5e9 155portal_unmount(mp, mntflags, td)
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156 struct mount *mp;
157 int mntflags;
dadab5e9 158 struct thread *td;
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159{
160 int error, flags = 0;
161
162
163 if (mntflags & MNT_FORCE)
164 flags |= FORCECLOSE;
165
166 /*
167 * Clear out buffer cache. I don't think we
168 * ever get anything cached at this level at the
169 * moment, but who knows...
170 */
171#ifdef notyet
172 mntflushbuf(mp, 0);
173 if (mntinvalbuf(mp, 1))
174 return (EBUSY);
175#endif
176 /* There is 1 extra root vnode reference (pm_root). */
177 error = vflush(mp, 1, flags);
178 if (error)
179 return (error);
180
181 /*
182 * Shutdown the socket. This will cause the select in the
183 * daemon to wake up, and then the accept will get ECONNABORTED
184 * which it interprets as a request to go and bury itself.
185 */
186 soshutdown((struct socket *) VFSTOPORTAL(mp)->pm_server->f_data, 2);
187 /*
188 * Discard reference to underlying file. Must call closef because
189 * this may be the last reference.
190 */
dadab5e9 191 closef(VFSTOPORTAL(mp)->pm_server, (struct thread *) 0);
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192 /*
193 * Finally, throw away the portalmount structure
194 */
195 free(mp->mnt_data, M_PORTALFSMNT); /* XXX */
196 mp->mnt_data = 0;
197 return (0);
198}
199
200static int
201portal_root(mp, vpp)
202 struct mount *mp;
203 struct vnode **vpp;
204{
dadab5e9 205 struct thread *td = curthread; /* XXX */
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206 struct vnode *vp;
207
208 /*
209 * Return locked reference to root.
210 */
211 vp = VFSTOPORTAL(mp)->pm_root;
212 VREF(vp);
dadab5e9 213 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
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214 *vpp = vp;
215 return (0);
216}
217
218static int
dadab5e9 219portal_statfs(mp, sbp, td)
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220 struct mount *mp;
221 struct statfs *sbp;
dadab5e9 222 struct thread *td;
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223{
224
225 sbp->f_flags = 0;
226 sbp->f_bsize = DEV_BSIZE;
227 sbp->f_iosize = DEV_BSIZE;
228 sbp->f_blocks = 2; /* 1K to keep df happy */
229 sbp->f_bfree = 0;
230 sbp->f_bavail = 0;
231 sbp->f_files = 1; /* Allow for "." */
232 sbp->f_ffree = 0; /* See comments above */
233 if (sbp != &mp->mnt_stat) {
234 sbp->f_type = mp->mnt_vfc->vfc_typenum;
235 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
236 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
237 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
238 }
239 return (0);
240}
241
242static struct vfsops portal_vfsops = {
243 portal_mount,
244 vfs_stdstart,
245 portal_unmount,
246 portal_root,
247 vfs_stdquotactl,
248 portal_statfs,
249 vfs_stdsync,
250 vfs_stdvget,
251 vfs_stdfhtovp,
252 vfs_stdcheckexp,
253 vfs_stdvptofh,
254 vfs_stdinit,
255 vfs_stduninit,
256 vfs_stdextattrctl,
257};
258
259VFS_SET(portal_vfsops, portal, VFCF_SYNTHETIC);