Simplify vn_lock(), VOP_LOCK(), and VOP_UNLOCK() by removing the thread_t
[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 $
ca466bae 39 * $DragonFly: src/sys/vfs/portal/portal_vfsops.c,v 1.18 2006/05/05 21:15:10 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>
1f2de5d4 59#include "portal.h"
984263bc 60
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61extern struct vnodeopv_entry_desc portal_vnodeop_entries[];
62
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63static MALLOC_DEFINE(M_PORTALFSMNT, "PORTAL mount", "PORTAL mount structure");
64
a6ee311a 65static int portal_mount (struct mount *mp, char *path, caddr_t data,
21739618 66 struct thread *td);
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67static int portal_unmount (struct mount *mp, int mntflags,
68 struct thread *td);
69static int portal_root (struct mount *mp, struct vnode **vpp);
70static int portal_statfs (struct mount *mp, struct statfs *sbp,
71 struct thread *td);
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72
73/*
74 * Mount the per-process file descriptors (/dev/fd)
75 */
76static int
21739618 77portal_mount(struct mount *mp, char *path, caddr_t data, struct thread *td)
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78{
79 struct file *fp;
80 struct portal_args args;
81 struct portalmount *fmp;
82 struct socket *so;
83 struct vnode *rvp;
84 struct portalnode *pn;
85 u_int size;
86 int error;
87
88 /*
89 * Update is a no-op
90 */
91 if (mp->mnt_flag & MNT_UPDATE)
92 return (EOPNOTSUPP);
93
94 error = copyin(data, (caddr_t) &args, sizeof(struct portal_args));
95 if (error)
96 return (error);
97
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98 KKASSERT(td->td_proc);
99 error = holdsock(td->td_proc->p_fd, args.pa_socket, &fp);
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100 if (error)
101 return (error);
102 so = (struct socket *) fp->f_data;
103 if (so->so_proto->pr_domain->dom_family != AF_UNIX) {
dadab5e9 104 fdrop(fp, td);
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105 return (ESOCKTNOSUPPORT);
106 }
107
108 MALLOC(pn, struct portalnode *, sizeof(struct portalnode),
109 M_TEMP, M_WAITOK);
110
111 MALLOC(fmp, struct portalmount *, sizeof(struct portalmount),
112 M_PORTALFSMNT, M_WAITOK); /* XXX */
113
0961aa92 114
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115 vfs_add_vnodeops(mp, &mp->mnt_vn_norm_ops,
116 portal_vnodeop_entries, 0);
0961aa92 117
6ddb7618 118 error = getnewvnode(VT_PORTAL, mp, &rvp, 0, 0);
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119 if (error) {
120 FREE(fmp, M_PORTALFSMNT);
121 FREE(pn, M_TEMP);
dadab5e9 122 fdrop(fp, td);
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123 return (error);
124 }
125
126 rvp->v_data = pn;
127 rvp->v_type = VDIR;
128 rvp->v_flag |= VROOT;
129 VTOPORTAL(rvp)->pt_arg = 0;
130 VTOPORTAL(rvp)->pt_size = 0;
131 VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID;
132 fmp->pm_root = rvp;
133 fmp->pm_server = fp; fp->f_count++;
134
135 mp->mnt_flag |= MNT_LOCAL;
136 mp->mnt_data = (qaddr_t) fmp;
137 vfs_getnewfsid(mp);
138
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139 (void)copyinstr(args.pa_config,
140 mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
141 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
142
143#ifdef notdef
144 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
145 bcopy("portal", mp->mnt_stat.f_mntfromname, sizeof("portal"));
146#endif
5fd012e0 147 vx_unlock(rvp);
984263bc 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
1f03da75 155portal_unmount(struct mount *mp, int mntflags, struct thread *td)
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156{
157 int error, flags = 0;
158
159
160 if (mntflags & MNT_FORCE)
161 flags |= FORCECLOSE;
162
163 /*
164 * Clear out buffer cache. I don't think we
165 * ever get anything cached at this level at the
166 * moment, but who knows...
167 */
168#ifdef notyet
169 mntflushbuf(mp, 0);
170 if (mntinvalbuf(mp, 1))
171 return (EBUSY);
172#endif
173 /* There is 1 extra root vnode reference (pm_root). */
174 error = vflush(mp, 1, flags);
175 if (error)
176 return (error);
177
178 /*
179 * Shutdown the socket. This will cause the select in the
180 * daemon to wake up, and then the accept will get ECONNABORTED
181 * which it interprets as a request to go and bury itself.
182 */
183 soshutdown((struct socket *) VFSTOPORTAL(mp)->pm_server->f_data, 2);
184 /*
185 * Discard reference to underlying file. Must call closef because
186 * this may be the last reference.
187 */
dadab5e9 188 closef(VFSTOPORTAL(mp)->pm_server, (struct thread *) 0);
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189 /*
190 * Finally, throw away the portalmount structure
191 */
192 free(mp->mnt_data, M_PORTALFSMNT); /* XXX */
193 mp->mnt_data = 0;
194 return (0);
195}
196
197static int
1f03da75 198portal_root(struct mount *mp, struct vnode **vpp)
984263bc 199{
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200 struct vnode *vp;
201
202 /*
203 * Return locked reference to root.
204 */
205 vp = VFSTOPORTAL(mp)->pm_root;
597aea93 206 vref(vp);
ca466bae 207 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
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208 *vpp = vp;
209 return (0);
210}
211
212static int
1f03da75 213portal_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
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214{
215
216 sbp->f_flags = 0;
217 sbp->f_bsize = DEV_BSIZE;
218 sbp->f_iosize = DEV_BSIZE;
219 sbp->f_blocks = 2; /* 1K to keep df happy */
220 sbp->f_bfree = 0;
221 sbp->f_bavail = 0;
222 sbp->f_files = 1; /* Allow for "." */
223 sbp->f_ffree = 0; /* See comments above */
224 if (sbp != &mp->mnt_stat) {
225 sbp->f_type = mp->mnt_vfc->vfc_typenum;
226 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
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227 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
228 }
229 return (0);
230}
231
232static struct vfsops portal_vfsops = {
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233 .vfs_mount = portal_mount,
234 .vfs_unmount = portal_unmount,
235 .vfs_root = portal_root,
236 .vfs_statfs = portal_statfs,
237 .vfs_sync = vfs_stdsync
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238};
239
240VFS_SET(portal_vfsops, portal, VFCF_SYNTHETIC);