2 * Copyright (c) 2002 Poul-Henning Kamp
3 * Copyright (c) 2002 Networks Associates Technology, Inc.
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.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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
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
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/kernel.h>
42 #include <sys/eventhandler.h>
43 #include <sys/malloc.h>
45 #include <sys/sysctl.h>
47 #include <sys/kthread.h>
49 #include <sys/mutex.h>
51 #include <sys/sched.h>
53 #include <geom/geom.h>
54 #include <geom/geom_int.h>
56 MALLOC_DEFINE(M_GEOM, "GEOM", "Geom data structures");
58 struct sx topology_lock;
60 static struct proc *g_up_proc;
63 int g_collectstats = 1;
67 * G_UP and G_DOWN are the two threads which push I/O through the
70 * Things are procesed in a FIFO order, but these threads could be
71 * part of I/O prioritization by deciding which bios/bioqs to service
74 * We have only one thread in each direction, it is belived that until
75 * a very non-trivial workload in the UP/DOWN path this will be enough,
76 * but more than one can actually be run without problems.
78 * Holding the "mymutex" is a debugging feature: It prevents people
79 * from sleeping in the UP/DOWN I/O path by mistake or design (doing
80 * so almost invariably result in deadlocks since it stalls all I/O
81 * processing in the given direction.
87 struct proc *p = g_up_proc;
88 struct thread *tp = FIRST_THREAD_IN_PROC(p);
90 mtx_assert(&Giant, MA_NOTOWNED);
92 sched_prio(tp, PRIBIO);
99 static struct kproc_desc g_up_kp = {
105 static struct proc *g_down_proc;
108 g_down_procbody(void)
110 struct proc *p = g_down_proc;
111 struct thread *tp = FIRST_THREAD_IN_PROC(p);
113 mtx_assert(&Giant, MA_NOTOWNED);
115 sched_prio(tp, PRIBIO);
118 g_io_schedule_down(tp);
122 static struct kproc_desc g_down_kp = {
128 static struct proc *g_event_proc;
131 g_event_procbody(void)
133 struct proc *p = g_event_proc;
134 struct thread *tp = FIRST_THREAD_IN_PROC(p);
136 mtx_assert(&Giant, MA_NOTOWNED);
138 sched_prio(tp, PRIBIO);
144 static struct kproc_desc g_event_kp = {
151 geom_shutdown(void *foo __unused)
161 g_trace(G_T_TOPOLOGY, "g_ignition");
162 sx_init(&topology_lock, "GEOM topology");
167 kproc_start(&g_event_kp);
168 kproc_start(&g_up_kp);
169 kproc_start(&g_down_kp);
171 EVENTHANDLER_REGISTER(shutdown_pre_sync, geom_shutdown, NULL,
176 sysctl_kern_geom_conftxt(SYSCTL_HANDLER_ARGS)
181 sb = sbuf_new_auto();
182 g_waitfor_event(g_conftxt, sb, M_WAITOK, NULL);
183 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
189 sysctl_kern_geom_confdot(SYSCTL_HANDLER_ARGS)
194 sb = sbuf_new_auto();
195 g_waitfor_event(g_confdot, sb, M_WAITOK, NULL);
196 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
202 sysctl_kern_geom_confxml(SYSCTL_HANDLER_ARGS)
207 sb = sbuf_new_auto();
208 g_waitfor_event(g_confxml, sb, M_WAITOK, NULL);
209 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
214 SYSCTL_NODE(_kern, OID_AUTO, geom, CTLFLAG_RW, 0, "GEOMetry management");
216 SYSCTL_PROC(_kern_geom, OID_AUTO, confxml, CTLTYPE_STRING|CTLFLAG_RD,
217 0, 0, sysctl_kern_geom_confxml, "",
218 "Dump the GEOM config in XML");
220 SYSCTL_PROC(_kern_geom, OID_AUTO, confdot, CTLTYPE_STRING|CTLFLAG_RD,
221 0, 0, sysctl_kern_geom_confdot, "",
222 "Dump the GEOM config in dot");
224 SYSCTL_PROC(_kern_geom, OID_AUTO, conftxt, CTLTYPE_STRING|CTLFLAG_RD,
225 0, 0, sysctl_kern_geom_conftxt, "",
226 "Dump the GEOM config in txt");
228 TUNABLE_INT("kern.geom.debugflags", &g_debugflags);
229 SYSCTL_INT(_kern_geom, OID_AUTO, debugflags, CTLFLAG_RW,
230 &g_debugflags, 0, "Set various trace levels for GEOM debugging");
232 SYSCTL_INT(_kern_geom, OID_AUTO, collectstats, CTLFLAG_RW,
234 "Control statistics collection on GEOM providers and consumers");
236 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_class, CTLFLAG_RD,
237 0, sizeof(struct g_class), "sizeof(struct g_class)");
238 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_geom, CTLFLAG_RD,
239 0, sizeof(struct g_geom), "sizeof(struct g_geom)");
240 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_provider, CTLFLAG_RD,
241 0, sizeof(struct g_provider), "sizeof(struct g_provider)");
242 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_consumer, CTLFLAG_RD,
243 0, sizeof(struct g_consumer), "sizeof(struct g_consumer)");
244 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_bioq, CTLFLAG_RD,
245 0, sizeof(struct g_bioq), "sizeof(struct g_bioq)");