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 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 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> 44 #include <sys/bio.h> 45 #include <sys/sysctl.h> 46 #include <sys/proc.h> 47 #include <sys/unistd.h> 48 #include <sys/kthread.h> 49 #include <sys/lock.h> 50 #include <sys/mutex.h> 51 #include <sys/sbuf.h> 52 #include <sys/sched.h> 53 #include <sys/sx.h> 54 #include <geom/geom.h> 55 #include <geom/geom_int.h> 56 57 MALLOC_DEFINE(M_GEOM, "GEOM", "Geom data structures"); 58 59 struct sx topology_lock; 60 61 static struct proc *g_proc; 62 static struct thread *g_up_td; 63 static struct thread *g_down_td; 64 static struct thread *g_event_td; 65 66 int g_debugflags; 67 int g_collectstats = 1; 68 int g_shutdown; 69 int g_notaste; 70 71 /* 72 * G_UP and G_DOWN are the two threads which push I/O through the 73 * stack. 74 * 75 * Things are procesed in a FIFO order, but these threads could be 76 * part of I/O prioritization by deciding which bios/bioqs to service 77 * in what order. 78 * 79 * We have only one thread in each direction, it is belived that until 80 * a very non-trivial workload in the UP/DOWN path this will be enough, 81 * but more than one can actually be run without problems. 82 * 83 * Holding the "mymutex" is a debugging feature: It prevents people 84 * from sleeping in the UP/DOWN I/O path by mistake or design (doing 85 * so almost invariably result in deadlocks since it stalls all I/O 86 * processing in the given direction. 87 */ 88 89 static void 90 g_up_procbody(void *arg) 91 { 92 93 mtx_assert(&Giant, MA_NOTOWNED); 94 thread_lock(g_up_td); 95 sched_prio(g_up_td, PRIBIO); 96 thread_unlock(g_up_td); 97 for(;;) { 98 g_io_schedule_up(g_up_td); 99 } 100 } 101 102 static void 103 g_down_procbody(void *arg) 104 { 105 106 mtx_assert(&Giant, MA_NOTOWNED); 107 thread_lock(g_down_td); 108 sched_prio(g_down_td, PRIBIO); 109 thread_unlock(g_down_td); 110 for(;;) { 111 g_io_schedule_down(g_down_td); 112 } 113 } 114 115 static void 116 g_event_procbody(void *arg) 117 { 118 119 mtx_assert(&Giant, MA_NOTOWNED); 120 thread_lock(g_event_td); 121 sched_prio(g_event_td, PRIBIO); 122 thread_unlock(g_event_td); 123 g_run_events(); 124 /* NOTREACHED */ 125 } 126 127 static void 128 geom_shutdown(void *foo __unused) 129 { 130 131 g_shutdown = 1; 132 } 133 134 void 135 g_init(void) 136 { 137 138 g_trace(G_T_TOPOLOGY, "g_ignition"); 139 sx_init(&topology_lock, "GEOM topology"); 140 g_io_init(); 141 g_event_init(); 142 g_ctl_init(); 143 mtx_lock(&Giant); 144 kproc_kthread_add(g_event_procbody, NULL, &g_proc, &g_event_td, 145 RFHIGHPID, 0, "geom", "g_event"); 146 kproc_kthread_add(g_up_procbody, NULL, &g_proc, &g_up_td, 147 RFHIGHPID, 0, "geom", "g_up"); 148 kproc_kthread_add(g_down_procbody, NULL, &g_proc, &g_down_td, 149 RFHIGHPID, 0, "geom", "g_down"); 150 mtx_unlock(&Giant); 151 EVENTHANDLER_REGISTER(shutdown_pre_sync, geom_shutdown, NULL, 152 SHUTDOWN_PRI_FIRST); 153 } 154 155 static int 156 sysctl_kern_geom_conftxt(SYSCTL_HANDLER_ARGS) 157 { 158 int error; 159 struct sbuf *sb; 160 161 sb = sbuf_new_auto(); 162 g_waitfor_event(g_conftxt, sb, M_WAITOK, NULL); 163 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 164 sbuf_delete(sb); 165 return error; 166 } 167 168 static int 169 sysctl_kern_geom_confdot(SYSCTL_HANDLER_ARGS) 170 { 171 int error; 172 struct sbuf *sb; 173 174 sb = sbuf_new_auto(); 175 g_waitfor_event(g_confdot, sb, M_WAITOK, NULL); 176 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 177 sbuf_delete(sb); 178 return error; 179 } 180 181 static int 182 sysctl_kern_geom_confxml(SYSCTL_HANDLER_ARGS) 183 { 184 int error; 185 struct sbuf *sb; 186 187 sb = sbuf_new_auto(); 188 g_waitfor_event(g_confxml, sb, M_WAITOK, NULL); 189 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 190 sbuf_delete(sb); 191 return error; 192 } 193 194 SYSCTL_NODE(_kern, OID_AUTO, geom, CTLFLAG_RW, 0, "GEOMetry management"); 195 196 SYSCTL_PROC(_kern_geom, OID_AUTO, confxml, CTLTYPE_STRING|CTLFLAG_RD, 197 0, 0, sysctl_kern_geom_confxml, "", 198 "Dump the GEOM config in XML"); 199 200 SYSCTL_PROC(_kern_geom, OID_AUTO, confdot, CTLTYPE_STRING|CTLFLAG_RD, 201 0, 0, sysctl_kern_geom_confdot, "", 202 "Dump the GEOM config in dot"); 203 204 SYSCTL_PROC(_kern_geom, OID_AUTO, conftxt, CTLTYPE_STRING|CTLFLAG_RD, 205 0, 0, sysctl_kern_geom_conftxt, "", 206 "Dump the GEOM config in txt"); 207 208 TUNABLE_INT("kern.geom.debugflags", &g_debugflags); 209 SYSCTL_INT(_kern_geom, OID_AUTO, debugflags, CTLFLAG_RW, 210 &g_debugflags, 0, "Set various trace levels for GEOM debugging"); 211 212 SYSCTL_INT(_kern_geom, OID_AUTO, notaste, CTLFLAG_RW, 213 &g_notaste, 0, "Prevent GEOM tasting"); 214 215 SYSCTL_INT(_kern_geom, OID_AUTO, collectstats, CTLFLAG_RW, 216 &g_collectstats, 0, 217 "Control statistics collection on GEOM providers and consumers"); 218 219 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_class, CTLFLAG_RD, 220 0, sizeof(struct g_class), "sizeof(struct g_class)"); 221 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_geom, CTLFLAG_RD, 222 0, sizeof(struct g_geom), "sizeof(struct g_geom)"); 223 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_provider, CTLFLAG_RD, 224 0, sizeof(struct g_provider), "sizeof(struct g_provider)"); 225 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_consumer, CTLFLAG_RD, 226 0, sizeof(struct g_consumer), "sizeof(struct g_consumer)"); 227 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_bioq, CTLFLAG_RD, 228 0, sizeof(struct g_bioq), "sizeof(struct g_bioq)"); 229