geom_kern.c revision 92108 
1/*-
2 * Copyright (c) 2002 Poul-Henning Kamp
3 * Copyright (c) 2002 Networks Associates Technology, Inc.
4 * All rights reserved.
5 *
6 * This software was developed for the FreeBSD Project by Poul-Henning Kamp
7 * and NAI Labs, the Security Research Division of Network Associates, Inc.
8 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
9 * DARPA CHATS research program.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. The names of the authors may not be used to endorse or promote
20 *    products derived from this software without specific prior written
21 *    permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * $FreeBSD: head/sys/geom/geom_kern.c 92108 2002-03-11 21:42:35Z phk $
36 */
37
38#include <sys/param.h>
39#include <sys/systm.h>
40#include <sys/kernel.h>
41#include <sys/malloc.h>
42#include <sys/bio.h>
43#include <sys/sysctl.h>
44#include <sys/proc.h>
45#include <sys/kthread.h>
46#include <sys/lock.h>
47#include <sys/mutex.h>
48#include <sys/sx.h>
49#include <sys/sbuf.h>
50#include <sys/errno.h>
51#include <geom/geom.h>
52
53MALLOC_DEFINE(M_GEOM, "GEOM", "Geom data structures");
54
55struct sx topology_lock;
56
57static struct proc *g_up_proc;
58
59int g_debugflags;
60
61static void
62g_up_procbody(void)
63{
64	struct proc *p = g_up_proc;
65	struct thread *tp = &p->p_xxthread;
66
67	curthread->td_base_pri = PRIBIO;
68	for(;;) {
69		g_io_schedule_up(tp);
70		mtx_lock(&Giant);
71		tsleep(&g_wait_up, PRIBIO, "g_up", hz/10);
72		mtx_unlock(&Giant);
73	}
74}
75
76struct kproc_desc g_up_kp = {
77	"g_up",
78	g_up_procbody,
79	&g_up_proc,
80};
81
82static struct proc *g_down_proc;
83
84static void
85g_down_procbody(void)
86{
87	struct proc *p = g_down_proc;
88	struct thread *tp = &p->p_xxthread;
89
90	curthread->td_base_pri = PRIBIO;
91	for(;;) {
92		g_io_schedule_down(tp);
93		mtx_lock(&Giant);
94		tsleep(&g_wait_down, PRIBIO, "g_down", hz/10);
95		mtx_unlock(&Giant);
96	}
97}
98
99struct kproc_desc g_down_kp = {
100	"g_down",
101	g_down_procbody,
102	&g_down_proc,
103};
104
105static struct proc *g_event_proc;
106
107static void
108g_event_procbody(void)
109{
110	struct proc *p = g_event_proc;
111	struct thread *tp = &p->p_xxthread;
112
113	curthread->td_base_pri = PRIBIO;
114	for(;;) {
115		g_run_events(tp);
116		mtx_lock(&Giant);
117		tsleep(&g_wait_event, PRIBIO, "g_events", hz/10);
118		mtx_unlock(&Giant);
119	}
120}
121
122struct kproc_desc g_event_kp = {
123	"g_event",
124	g_event_procbody,
125	&g_event_proc,
126};
127
128void
129g_init(void)
130{
131	printf("Initializing GEOMetry subsystem\n");
132	if (bootverbose)
133		g_debugflags |= G_T_TOPOLOGY;
134	sx_init(&topology_lock, "GEOM topology");
135	g_io_init();
136	g_event_init();
137	mtx_lock(&Giant);
138	kproc_start(&g_event_kp);
139	kproc_start(&g_up_kp);
140	kproc_start(&g_down_kp);
141	mtx_unlock(&Giant);
142}
143
144static int
145sysctl_debug_geomdot(SYSCTL_HANDLER_ARGS)
146{
147	int i, error;
148	struct sbuf *sb;
149
150	i = 0;
151	sb = g_confdot();
152	error = sysctl_handle_opaque(oidp, sbuf_data(sb), sbuf_len(sb), req);
153	sbuf_delete(sb);
154	return (error);
155}
156
157SYSCTL_PROC(_debug, OID_AUTO, geomdot, CTLTYPE_STRING|CTLFLAG_RD,
158	0, 0, sysctl_debug_geomdot, "A",
159	"Dump the GEOM config");
160
161static int
162sysctl_debug_geomconf(SYSCTL_HANDLER_ARGS)
163{
164	int i, error;
165	struct sbuf *sb;
166
167	i = 0;
168	sb = g_conf();
169	error = sysctl_handle_opaque(oidp, sbuf_data(sb), sbuf_len(sb), req);
170	sbuf_delete(sb);
171	return (error);
172}
173
174SYSCTL_PROC(_debug, OID_AUTO, geomconf, CTLTYPE_STRING|CTLFLAG_RD,
175	0, 0, sysctl_debug_geomconf, "A",
176	"Dump the GEOM config");
177
178SYSCTL_INT(_debug, OID_AUTO, geomdebugflags, CTLTYPE_INT|CTLFLAG_RW,
179	&g_debugflags, 0, "");
180
181SYSCTL_INT(_debug_sizeof, OID_AUTO, g_method, CTLTYPE_INT|CTLFLAG_RD,
182	0, sizeof(struct g_method), "");
183SYSCTL_INT(_debug_sizeof, OID_AUTO, g_geom, CTLTYPE_INT|CTLFLAG_RD,
184	0, sizeof(struct g_geom), "");
185SYSCTL_INT(_debug_sizeof, OID_AUTO, g_provider, CTLTYPE_INT|CTLFLAG_RD,
186	0, sizeof(struct g_provider), "");
187SYSCTL_INT(_debug_sizeof, OID_AUTO, g_consumer, CTLTYPE_INT|CTLFLAG_RD,
188	0, sizeof(struct g_consumer), "");
189SYSCTL_INT(_debug_sizeof, OID_AUTO, g_bioq, CTLTYPE_INT|CTLFLAG_RD,
190	0, sizeof(struct g_bioq), "");
191SYSCTL_INT(_debug_sizeof, OID_AUTO, g_event, CTLTYPE_INT|CTLFLAG_RD,
192	0, sizeof(struct g_event), "");
193