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