FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_kern.c
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: releng/5.0/sys/geom/geom_kern.c 108563 2003-01-02 19:59:57Z 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 <geom/geom.h>
51 #include <geom/geom_int.h>
52
53 MALLOC_DEFINE(M_GEOM, "GEOM", "Geom data structures");
54
55 struct sx topology_lock;
56
57 static struct proc *g_up_proc;
58
59 int g_debugflags;
60
61 /*
62 * G_UP and G_DOWN are the two threads which push I/O through the
63 * stack.
64 *
65 * Things are procesed in a FIFO order, but these threads could be
66 * part of I/O prioritization by deciding which bios/bioqs to service
67 * in what order.
68 *
69 * We have only one thread in each direction, it is belived that until
70 * a very non-trivial workload in the UP/DOWN path this will be enough,
71 * but more than one can actually be run without problems.
72 *
73 * Holding the "mymutex" is a debugging feature: It prevents people
74 * from sleeping in the UP/DOWN I/O path by mistake or design (doing
75 * so almost invariably result in deadlocks since it stalls all I/O
76 * processing in the given direction.
77 */
78
79 static void
80 g_up_procbody(void)
81 {
82 struct proc *p = g_up_proc;
83 struct thread *tp = FIRST_THREAD_IN_PROC(p);
84 struct mtx mymutex;
85
86 mtx_assert(&Giant, MA_NOTOWNED);
87 bzero(&mymutex, sizeof mymutex);
88 mtx_init(&mymutex, "g_up", MTX_DEF, 0);
89 mtx_lock(&mymutex);
90 tp->td_base_pri = PRIBIO;
91 for(;;) {
92 g_io_schedule_up(tp);
93 msleep(&g_wait_up, &mymutex, PRIBIO, "g_up", hz/10);
94 }
95 }
96
97 struct kproc_desc g_up_kp = {
98 "g_up",
99 g_up_procbody,
100 &g_up_proc,
101 };
102
103 static struct proc *g_down_proc;
104
105 static void
106 g_down_procbody(void)
107 {
108 struct proc *p = g_down_proc;
109 struct thread *tp = FIRST_THREAD_IN_PROC(p);
110 struct mtx mymutex;
111
112 mtx_assert(&Giant, MA_NOTOWNED);
113 bzero(&mymutex, sizeof mymutex);
114 mtx_init(&mymutex, "g_down", MTX_DEF, 0);
115 mtx_lock(&mymutex);
116 tp->td_base_pri = PRIBIO;
117 for(;;) {
118 g_io_schedule_down(tp);
119 msleep(&g_wait_down, &mymutex, PRIBIO, "g_down", hz/10);
120 }
121 }
122
123 struct kproc_desc g_down_kp = {
124 "g_down",
125 g_down_procbody,
126 &g_down_proc,
127 };
128
129 static struct proc *g_event_proc;
130
131 static void
132 g_event_procbody(void)
133 {
134 struct proc *p = g_event_proc;
135 struct thread *tp = FIRST_THREAD_IN_PROC(p);
136
137 mtx_assert(&Giant, MA_NOTOWNED);
138 tp->td_base_pri = PRIBIO;
139 for(;;) {
140 g_run_events();
141 tsleep(&g_wait_event, PRIBIO, "g_events", hz/10);
142 }
143 }
144
145 struct kproc_desc g_event_kp = {
146 "g_event",
147 g_event_procbody,
148 &g_event_proc,
149 };
150
151 void
152 g_init(void)
153 {
154 printf("Initializing GEOMetry subsystem\n");
155 sx_init(&topology_lock, "GEOM topology");
156 g_io_init();
157 g_event_init();
158 mtx_lock(&Giant);
159 kproc_start(&g_event_kp);
160 kproc_start(&g_up_kp);
161 kproc_start(&g_down_kp);
162 mtx_unlock(&Giant);
163 }
164
165 static int
166 sysctl_kern_geom_conftxt(SYSCTL_HANDLER_ARGS)
167 {
168 int error;
169 struct sbuf *sb;
170
171 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND);
172 sbuf_clear(sb);
173 g_call_me(g_conftxt, sb);
174 do {
175 tsleep(sb, PZERO, "g_dot", hz);
176 } while(!sbuf_done(sb));
177 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
178 sbuf_delete(sb);
179 return error;
180 }
181
182 static int
183 sysctl_kern_geom_confdot(SYSCTL_HANDLER_ARGS)
184 {
185 int error;
186 struct sbuf *sb;
187
188 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND);
189 sbuf_clear(sb);
190 g_call_me(g_confdot, sb);
191 do {
192 tsleep(sb, PZERO, "g_dot", hz);
193 } while(!sbuf_done(sb));
194 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
195 sbuf_delete(sb);
196 return error;
197 }
198
199 static int
200 sysctl_kern_geom_confxml(SYSCTL_HANDLER_ARGS)
201 {
202 int error;
203 struct sbuf *sb;
204
205 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND);
206 sbuf_clear(sb);
207 g_call_me(g_confxml, sb);
208 do {
209 tsleep(sb, PZERO, "g_xml", hz);
210 } while(!sbuf_done(sb));
211 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
212 sbuf_delete(sb);
213 return error;
214 }
215
216 SYSCTL_NODE(_kern, OID_AUTO, geom, CTLFLAG_RW, 0, "GEOMetry management");
217
218 SYSCTL_PROC(_kern_geom, OID_AUTO, confxml, CTLTYPE_STRING|CTLFLAG_RD,
219 0, 0, sysctl_kern_geom_confxml, "",
220 "Dump the GEOM config in XML");
221
222 SYSCTL_PROC(_kern_geom, OID_AUTO, confdot, CTLTYPE_STRING|CTLFLAG_RD,
223 0, 0, sysctl_kern_geom_confdot, "",
224 "Dump the GEOM config in dot");
225
226 SYSCTL_PROC(_kern_geom, OID_AUTO, conftxt, CTLTYPE_STRING|CTLFLAG_RD,
227 0, 0, sysctl_kern_geom_conftxt, "",
228 "Dump the GEOM config in txt");
229
230 SYSCTL_INT(_kern_geom, OID_AUTO, debugflags, CTLFLAG_RW,
231 &g_debugflags, 0, "");
232
233 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_class, CTLFLAG_RD,
234 0, sizeof(struct g_class), "");
235 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_geom, CTLFLAG_RD,
236 0, sizeof(struct g_geom), "");
237 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_provider, CTLFLAG_RD,
238 0, sizeof(struct g_provider), "");
239 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_consumer, CTLFLAG_RD,
240 0, sizeof(struct g_consumer), "");
241 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_bioq, CTLFLAG_RD,
242 0, sizeof(struct g_bioq), "");
243 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_event, CTLFLAG_RD,
244 0, sizeof(struct g_event), "");
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