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/kthread.h> 48 #include <sys/lock.h> 49 #include <sys/mutex.h> 50 #include <sys/sbuf.h> 51 #include <sys/sched.h> 52 #include <sys/sx.h> 53 #include <geom/geom.h> 54 #include <geom/geom_int.h> 55 56 MALLOC_DEFINE(M_GEOM, "GEOM", "Geom data structures"); 57 58 struct sx topology_lock; 59 60 static struct proc *g_up_proc; 61 62 int g_debugflags; 63 int g_collectstats = 1; 64 int g_shutdown; 65 66 /* 67 * G_UP and G_DOWN are the two threads which push I/O through the 68 * stack. 69 * 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 72 * in what order. 73 * 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. 77 * 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. 82 */ 83 84 static void 85 g_up_procbody(void) 86 { 87 struct proc *p = g_up_proc; 88 struct thread *tp = FIRST_THREAD_IN_PROC(p); 89 90 mtx_assert(&Giant, MA_NOTOWNED); 91 thread_lock(tp); 92 sched_prio(tp, PRIBIO); 93 thread_unlock(tp); 94 for(;;) { 95 g_io_schedule_up(tp); 96 } 97 } 98 99 static struct kproc_desc g_up_kp = { 100 "g_up", 101 g_up_procbody, 102 &g_up_proc, 103 }; 104 105 static struct proc *g_down_proc; 106 107 static void 108 g_down_procbody(void) 109 { 110 struct proc *p = g_down_proc; 111 struct thread *tp = FIRST_THREAD_IN_PROC(p); 112 113 mtx_assert(&Giant, MA_NOTOWNED); 114 thread_lock(tp); 115 sched_prio(tp, PRIBIO); 116 thread_unlock(tp); 117 for(;;) { 118 g_io_schedule_down(tp); 119 } 120 } 121 122 static struct kproc_desc g_down_kp = { 123 "g_down", 124 g_down_procbody, 125 &g_down_proc, 126 }; 127 128 static struct proc *g_event_proc; 129 130 static void 131 g_event_procbody(void) 132 { 133 struct proc *p = g_event_proc; 134 struct thread *tp = FIRST_THREAD_IN_PROC(p); 135 136 mtx_assert(&Giant, MA_NOTOWNED); 137 thread_lock(tp); 138 sched_prio(tp, PRIBIO); 139 thread_unlock(tp); 140 for(;;) { 141 g_run_events(); 142 tsleep(&g_wait_event, PRIBIO, "-", hz/10); 143 } 144 } 145 146 static struct kproc_desc g_event_kp = { 147 "g_event", 148 g_event_procbody, 149 &g_event_proc, 150 }; 151 152 static void 153 geom_shutdown(void *foo __unused) 154 { 155 156 g_shutdown = 1; 157 } 158 159 void 160 g_init(void) 161 { 162 163 g_trace(G_T_TOPOLOGY, "g_ignition"); 164 sx_init(&topology_lock, "GEOM topology"); 165 g_io_init(); 166 g_event_init(); 167 g_ctl_init(); 168 mtx_lock(&Giant); 169 kproc_start(&g_event_kp); 170 kproc_start(&g_up_kp); 171 kproc_start(&g_down_kp); 172 mtx_unlock(&Giant); 173 EVENTHANDLER_REGISTER(shutdown_pre_sync, geom_shutdown, NULL, 174 SHUTDOWN_PRI_FIRST); 175 } 176 177 static int 178 sysctl_kern_geom_conftxt(SYSCTL_HANDLER_ARGS) 179 { 180 int error; 181 struct sbuf *sb; 182 183 sb = sbuf_new_auto(); 184 g_waitfor_event(g_conftxt, sb, M_WAITOK, NULL); 185 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 186 sbuf_delete(sb); 187 return error; 188 } 189 190 static int 191 sysctl_kern_geom_confdot(SYSCTL_HANDLER_ARGS) 192 { 193 int error; 194 struct sbuf *sb; 195 196 sb = sbuf_new_auto(); 197 g_waitfor_event(g_confdot, sb, M_WAITOK, NULL); 198 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 199 sbuf_delete(sb); 200 return error; 201 } 202 203 static int 204 sysctl_kern_geom_confxml(SYSCTL_HANDLER_ARGS) 205 { 206 int error; 207 struct sbuf *sb; 208 209 sb = sbuf_new_auto(); 210 g_waitfor_event(g_confxml, sb, M_WAITOK, NULL); 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 TUNABLE_INT("kern.geom.debugflags", &g_debugflags); 231 SYSCTL_INT(_kern_geom, OID_AUTO, debugflags, CTLFLAG_RW, 232 &g_debugflags, 0, "Set various trace levels for GEOM debugging"); 233 234 SYSCTL_INT(_kern_geom, OID_AUTO, collectstats, CTLFLAG_RW, 235 &g_collectstats, 0, 236 "Control statistics collection on GEOM providers and consumers"); 237 238 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_class, CTLFLAG_RD, 239 0, sizeof(struct g_class), "sizeof(struct g_class)"); 240 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_geom, CTLFLAG_RD, 241 0, sizeof(struct g_geom), "sizeof(struct g_geom)"); 242 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_provider, CTLFLAG_RD, 243 0, sizeof(struct g_provider), "sizeof(struct g_provider)"); 244 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_consumer, CTLFLAG_RD, 245 0, sizeof(struct g_consumer), "sizeof(struct g_consumer)"); 246 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_bioq, CTLFLAG_RD, 247 0, sizeof(struct g_bioq), "sizeof(struct g_bioq)"); 248