FreeBSD/Linux Kernel Cross Reference
sys/coda/coda_fbsd.c
1 /*
2 *
3 * Coda: an Experimental Distributed File System
4 * Release 3.1
5 *
6 * Copyright (c) 1987-1998 Carnegie Mellon University
7 * All Rights Reserved
8 *
9 * Permission to use, copy, modify and distribute this software and its
10 * documentation is hereby granted, provided that both the copyright
11 * notice and this permission notice appear in all copies of the
12 * software, derivative works or modified versions, and any portions
13 * thereof, and that both notices appear in supporting documentation, and
14 * that credit is given to Carnegie Mellon University in all documents
15 * and publicity pertaining to direct or indirect use of this code or its
16 * derivatives.
17 *
18 * CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS,
19 * SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS
20 * FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON
21 * DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER
22 * RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF
23 * ANY DERIVATIVE WORK.
24 *
25 * Carnegie Mellon encourages users of this software to return any
26 * improvements or extensions that they make, and to grant Carnegie
27 * Mellon the rights to redistribute these changes without encumbrance.
28 *
29 * @(#) src/sys/coda/coda_fbsd.cr,v 1.1.1.1 1998/08/29 21:14:52 rvb Exp $
30 * $FreeBSD: releng/5.0/sys/coda/coda_fbsd.c 92755 2002-03-20 05:00:21Z alfred $
31 *
32 */
33
34 #include "vcoda.h"
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/conf.h>
39 #include <sys/fcntl.h>
40 #include <sys/kernel.h>
41 #include <sys/lock.h>
42 #include <sys/malloc.h>
43 #include <sys/ucred.h>
44 #include <sys/vnode.h>
45
46 #include <vm/vm.h>
47 #include <vm/vnode_pager.h>
48
49 #include <coda/coda.h>
50 #include <coda/cnode.h>
51 #include <coda/coda_vnops.h>
52 #include <coda/coda_psdev.h>
53
54 /*
55 From: "Jordan K. Hubbard" <jkh@time.cdrom.com>
56 Subject: Re: New 3.0 SNAPshot CDROM about ready for production..
57 To: "Robert.V.Baron" <rvb@GLUCK.CODA.CS.CMU.EDU>
58 Date: Fri, 20 Feb 1998 15:57:01 -0800
59
60 > Also I need a character device major number. (and might want to reserve
61 > a block of 10 syscalls.)
62
63 Just one char device number? No block devices? Very well, cdev 93 is yours!
64 */
65
66 #define VC_DEV_NO 93
67
68 static struct cdevsw codadevsw = {
69 /* open */ vc_nb_open,
70 /* close */ vc_nb_close,
71 /* read */ vc_nb_read,
72 /* write */ vc_nb_write,
73 /* ioctl */ vc_nb_ioctl,
74 /* poll */ vc_nb_poll,
75 /* mmap */ nommap,
76 /* strategy */ nostrategy,
77 /* name */ "Coda",
78 /* maj */ VC_DEV_NO,
79 /* dump */ nodump,
80 /* psize */ nopsize,
81 /* flags */ 0,
82 };
83
84 int vcdebug = 1;
85 #define VCDEBUG if (vcdebug) printf
86
87 static int
88 codadev_modevent(module_t mod, int type, void *data)
89 {
90
91 switch (type) {
92 case MOD_LOAD:
93 break;
94 case MOD_UNLOAD:
95 break;
96 default:
97 break;
98 }
99 return 0;
100 }
101 static moduledata_t codadev_mod = {
102 "codadev",
103 codadev_modevent,
104 NULL
105 };
106 DECLARE_MODULE(codadev, codadev_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE+VC_DEV_NO);
107
108 int
109 coda_fbsd_getpages(v)
110 void *v;
111 {
112 struct vop_getpages_args *ap = v;
113
114 #if 1
115 return vop_stdgetpages(ap);
116 #else
117 {
118 struct vnode *vp = ap->a_vp;
119 struct cnode *cp = VTOC(vp);
120 struct vnode *cfvp = cp->c_ovp;
121 int opened_internally = 0;
122 struct ucred *cred = (struct ucred *) 0;
123 struct proc *p = curproc;
124 int error = 0;
125
126 if (IS_CTL_VP(vp)) {
127 return(EINVAL);
128 }
129
130 /* Redirect the request to UFS. */
131
132 if (cfvp == NULL) {
133 opened_internally = 1;
134
135 error = VOP_OPEN(vp, FREAD, cred, p);
136 printf("coda_getp: Internally Opening %p\n", vp);
137
138 if (error) {
139 printf("coda_getpage: VOP_OPEN on container failed %d\n", error);
140 return (error);
141 }
142 if (vp->v_type == VREG) {
143 error = vfs_object_create(vp, p, cred);
144 if (error != 0) {
145 printf("coda_getpage: vfs_object_create() returns %d\n", error);
146 vput(vp);
147 return(error);
148 }
149 }
150
151 cfvp = cp->c_ovp;
152 } else {
153 printf("coda_getp: has container %p\n", cfvp);
154 }
155
156 printf("coda_fbsd_getpages: using container ");
157 /*
158 error = vnode_pager_generic_getpages(cfvp, ap->a_m, ap->a_count,
159 ap->a_reqpage);
160 */
161 error = VOP_GETPAGES(cfvp, ap->a_m, ap->a_count,
162 ap->a_reqpage, ap->a_offset);
163 printf("error = %d\n", error);
164
165 /* Do an internal close if necessary. */
166 if (opened_internally) {
167 (void)VOP_CLOSE(vp, FREAD, cred, p);
168 }
169
170 return(error);
171 }
172 #endif
173 }
174
175
176 /* for DEVFS, using bpf & tun drivers as examples*/
177 static void coda_fbsd_drvinit(void *unused);
178 static void coda_fbsd_drvuninit(void *unused);
179 static void coda_fbsd_clone(void *arg, char *name, int namelen, dev_t *dev);
180
181 static void coda_fbsd_clone(arg, name, namelen, dev)
182 void *arg;
183 char *name;
184 int namelen;
185 dev_t *dev;
186 {
187 int u;
188
189 if (*dev != NODEV)
190 return;
191 if (dev_stdclone(name,NULL,"cfs",&u) != 1)
192 return;
193
194 *dev = make_dev(&codadevsw,unit2minor(u),UID_ROOT,GID_WHEEL,0600,"cfs%d",u);
195 coda_mnttbl[unit2minor(u)].dev = *dev;
196
197 }
198
199 static void coda_fbsd_drvinit(unused)
200 void *unused;
201 {
202 int i;
203
204 EVENTHANDLER_REGISTER(dev_clone,coda_fbsd_clone,0,1000);
205 cdevsw_add(&codadevsw);
206 for(i=0;i<NVCODA;i++)
207 coda_mnttbl[i].dev = NULL;
208 }
209
210 static void coda_fbsd_drvuninit(unused)
211 void *unused;
212 {
213 int i;
214
215 EVENTHANDLER_DEREGISTER(dev_clone,NULL);
216 for(i=0;i<NVCODA;i++)
217 if(coda_mnttbl[i].dev)
218 destroy_dev(coda_mnttbl[i].dev);
219 cdevsw_remove(&codadevsw);
220 }
221
222 SYSINIT(coda_fbsd_dev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+VC_DEV_NO,coda_fbsd_drvinit,NULL);
223
224 SYSUNINIT(coda_fbsd_dev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+VC_DEV_NO,coda_fbsd_drvuninit,NULL);
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