1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2002 Poul-Henning Kamp 5 * Copyright (c) 2002 Networks Associates Technology, Inc. 6 * All rights reserved. 7 * 8 * This software was developed for the FreeBSD Project by Poul-Henning Kamp 9 * and NAI Labs, the Security Research Division of Network Associates, Inc. 10 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 11 * DARPA CHATS research program. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. The names of the authors may not be used to endorse or promote 22 * products derived from this software without specific prior written 23 * permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/kernel.h> 44 #include <sys/eventhandler.h> 45 #include <sys/malloc.h> 46 #include <sys/bio.h> 47 #include <sys/sysctl.h> 48 #include <sys/proc.h> 49 #include <sys/unistd.h> 50 #include <sys/kthread.h> 51 #include <sys/lock.h> 52 #include <sys/mutex.h> 53 #include <sys/sbuf.h> 54 #include <sys/sched.h> 55 #include <sys/sx.h> 56 #include <geom/geom.h> 57 #include <geom/geom_int.h> 58 59 MALLOC_DEFINE(M_GEOM, "GEOM", "Geom data structures"); 60 61 struct sx topology_lock; 62 63 static struct proc *g_proc; 64 static struct thread *g_up_td; 65 static struct thread *g_down_td; 66 static struct thread *g_event_td; 67 68 int g_debugflags; 69 int g_collectstats = 1; 70 int g_shutdown; 71 int g_notaste; 72 73 /* 74 * G_UP and G_DOWN are the two threads which push I/O through the 75 * stack. 76 * 77 * Things are procesed in a FIFO order, but these threads could be 78 * part of I/O prioritization by deciding which bios/bioqs to service 79 * in what order. 80 * 81 * We have only one thread in each direction, it is believed that until 82 * a very non-trivial workload in the UP/DOWN path this will be enough, 83 * but more than one can actually be run without problems. 84 * 85 * Holding the "mymutex" is a debugging feature: It prevents people 86 * from sleeping in the UP/DOWN I/O path by mistake or design (doing 87 * so almost invariably result in deadlocks since it stalls all I/O 88 * processing in the given direction. 89 */ 90 91 static void 92 g_up_procbody(void *arg) 93 { 94 95 thread_lock(g_up_td); 96 sched_prio(g_up_td, PRIBIO); 97 thread_unlock(g_up_td); 98 for(;;) { 99 g_io_schedule_up(g_up_td); 100 } 101 } 102 103 static void 104 g_down_procbody(void *arg) 105 { 106 107 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 thread_lock(g_event_td); 120 sched_prio(g_event_td, PRIBIO); 121 thread_unlock(g_event_td); 122 g_run_events(); 123 /* NOTREACHED */ 124 } 125 126 int 127 g_is_geom_thread(struct thread *td) 128 { 129 130 return (td == g_up_td || td == g_down_td || td == g_event_td); 131 } 132 133 static void 134 geom_shutdown(void *foo __unused) 135 { 136 137 g_shutdown = 1; 138 } 139 140 void 141 g_init(void) 142 { 143 144 g_trace(G_T_TOPOLOGY, "g_ignition"); 145 sx_init(&topology_lock, "GEOM topology"); 146 g_io_init(); 147 g_event_init(); 148 g_ctl_init(); 149 kproc_kthread_add(g_event_procbody, NULL, &g_proc, &g_event_td, 150 RFHIGHPID, 0, "geom", "g_event"); 151 kproc_kthread_add(g_up_procbody, NULL, &g_proc, &g_up_td, 152 RFHIGHPID, 0, "geom", "g_up"); 153 kproc_kthread_add(g_down_procbody, NULL, &g_proc, &g_down_td, 154 RFHIGHPID, 0, "geom", "g_down"); 155 EVENTHANDLER_REGISTER(shutdown_pre_sync, geom_shutdown, NULL, 156 SHUTDOWN_PRI_FIRST); 157 } 158 159 static int 160 sysctl_kern_geom_conftxt(SYSCTL_HANDLER_ARGS) 161 { 162 int error; 163 struct sbuf *sb; 164 165 sb = sbuf_new_auto(); 166 g_waitfor_event(g_conftxt, sb, M_WAITOK, NULL); 167 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 168 sbuf_delete(sb); 169 return error; 170 } 171 172 static int 173 sysctl_kern_geom_confdot(SYSCTL_HANDLER_ARGS) 174 { 175 int error; 176 struct sbuf *sb; 177 178 sb = sbuf_new_auto(); 179 g_waitfor_event(g_confdot, sb, M_WAITOK, NULL); 180 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 181 sbuf_delete(sb); 182 return error; 183 } 184 185 static int 186 sysctl_kern_geom_confxml(SYSCTL_HANDLER_ARGS) 187 { 188 int error; 189 struct sbuf *sb; 190 191 sb = sbuf_new_auto(); 192 g_waitfor_event(g_confxml, sb, M_WAITOK, NULL); 193 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 194 sbuf_delete(sb); 195 return error; 196 } 197 198 SYSCTL_NODE(_kern, OID_AUTO, geom, CTLFLAG_RW, 0, "GEOMetry management"); 199 200 SYSCTL_PROC(_kern_geom, OID_AUTO, confxml, CTLTYPE_STRING|CTLFLAG_RD, 201 0, 0, sysctl_kern_geom_confxml, "", 202 "Dump the GEOM config in XML"); 203 204 SYSCTL_PROC(_kern_geom, OID_AUTO, confdot, CTLTYPE_STRING|CTLFLAG_RD, 205 0, 0, sysctl_kern_geom_confdot, "", 206 "Dump the GEOM config in dot"); 207 208 SYSCTL_PROC(_kern_geom, OID_AUTO, conftxt, CTLTYPE_STRING|CTLFLAG_RD, 209 0, 0, sysctl_kern_geom_conftxt, "", 210 "Dump the GEOM config in txt"); 211 212 SYSCTL_INT(_kern_geom, OID_AUTO, debugflags, CTLFLAG_RWTUN, 213 &g_debugflags, 0, "Set various trace levels for GEOM debugging"); 214 215 SYSCTL_INT(_kern_geom, OID_AUTO, notaste, CTLFLAG_RW, 216 &g_notaste, 0, "Prevent GEOM tasting"); 217 218 SYSCTL_INT(_kern_geom, OID_AUTO, collectstats, CTLFLAG_RW, 219 &g_collectstats, 0, 220 "Control statistics collection on GEOM providers and consumers"); 221 222 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_class, CTLFLAG_RD, 223 SYSCTL_NULL_INT_PTR, sizeof(struct g_class), "sizeof(struct g_class)"); 224 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_geom, CTLFLAG_RD, 225 SYSCTL_NULL_INT_PTR, sizeof(struct g_geom), "sizeof(struct g_geom)"); 226 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_provider, CTLFLAG_RD, 227 SYSCTL_NULL_INT_PTR, sizeof(struct g_provider), "sizeof(struct g_provider)"); 228 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_consumer, CTLFLAG_RD, 229 SYSCTL_NULL_INT_PTR, sizeof(struct g_consumer), "sizeof(struct g_consumer)"); 230 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_bioq, CTLFLAG_RD, 231 SYSCTL_NULL_INT_PTR, sizeof(struct g_bioq), "sizeof(struct g_bioq)"); 232