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