geom_kern.c revision 108296
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: head/sys/geom/geom_kern.c 108296 2002-12-26 20:48:22Z phk $ 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 53MALLOC_DEFINE(M_GEOM, "GEOM", "Geom data structures"); 54 55struct sx topology_lock; 56 57static struct proc *g_up_proc; 58 59int g_debugflags; 60 61/* 62 * G_UP and G_DOWN are the two threads which push I/O through the 63 * stack. 64 * 65 * Things are procesed in a FIFO order, but these threads could be 66 * part of I/O prioritization by deciding which bios/bioqs to service 67 * in what order. 68 * 69 * We have only one thread in each direction, it is belived that until 70 * a very non-trivial workload in the UP/DOWN path this will be enough, 71 * but more than one can actually be run without problems. 72 * 73 * Holding the "mymutex" is a debugging feature: It prevents people 74 * from sleeping in the UP/DOWN I/O path by mistake or design (doing 75 * so almost invariably result in deadlocks since it stalls all I/O 76 * processing in the given direction. 77 */ 78 79static void 80g_up_procbody(void) 81{ 82 struct proc *p = g_up_proc; 83 struct thread *tp = FIRST_THREAD_IN_PROC(p); 84 struct mtx mymutex; 85 86 mtx_assert(&Giant, MA_NOTOWNED); 87 bzero(&mymutex, sizeof mymutex); 88 mtx_init(&mymutex, "g_up", MTX_DEF, 0); 89 mtx_lock(&mymutex); 90 tp->td_base_pri = PRIBIO; 91 for(;;) { 92 g_io_schedule_up(tp); 93 msleep(&g_wait_up, &mymutex, PRIBIO, "g_up", hz/10); 94 } 95} 96 97struct kproc_desc g_up_kp = { 98 "g_up", 99 g_up_procbody, 100 &g_up_proc, 101}; 102 103static struct proc *g_down_proc; 104 105static void 106g_down_procbody(void) 107{ 108 struct proc *p = g_down_proc; 109 struct thread *tp = FIRST_THREAD_IN_PROC(p); 110 struct mtx mymutex; 111 112 mtx_assert(&Giant, MA_NOTOWNED); 113 bzero(&mymutex, sizeof mymutex); 114 mtx_init(&mymutex, "g_down", MTX_DEF, 0); 115 mtx_lock(&mymutex); 116 tp->td_base_pri = PRIBIO; 117 for(;;) { 118 g_io_schedule_down(tp); 119 msleep(&g_wait_down, &mymutex, PRIBIO, "g_down", hz/10); 120 } 121} 122 123struct kproc_desc g_down_kp = { 124 "g_down", 125 g_down_procbody, 126 &g_down_proc, 127}; 128 129static struct proc *g_event_proc; 130 131static void 132g_event_procbody(void) 133{ 134 struct proc *p = g_event_proc; 135 struct thread *tp = FIRST_THREAD_IN_PROC(p); 136 137 mtx_assert(&Giant, MA_NOTOWNED); 138 tp->td_base_pri = PRIBIO; 139 for(;;) { 140 g_run_events(); 141 tsleep(&g_wait_event, PRIBIO, "g_events", hz/10); 142 } 143} 144 145struct kproc_desc g_event_kp = { 146 "g_event", 147 g_event_procbody, 148 &g_event_proc, 149}; 150 151void 152g_init(void) 153{ 154 printf("Initializing GEOMetry subsystem\n"); 155 sx_init(&topology_lock, "GEOM topology"); 156 g_io_init(); 157 g_event_init(); 158 mtx_lock(&Giant); 159 kproc_start(&g_event_kp); 160 kproc_start(&g_up_kp); 161 kproc_start(&g_down_kp); 162 mtx_unlock(&Giant); 163} 164 165static int 166sysctl_kern_geom_conftxt(SYSCTL_HANDLER_ARGS) 167{ 168 int error; 169 struct sbuf *sb; 170 171 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 172 sbuf_clear(sb); 173 g_call_me(g_conftxt, sb); 174 do { 175 tsleep(sb, PZERO, "g_dot", hz); 176 } while(!sbuf_done(sb)); 177 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 178 sbuf_delete(sb); 179 return error; 180} 181 182static int 183sysctl_kern_geom_confdot(SYSCTL_HANDLER_ARGS) 184{ 185 int error; 186 struct sbuf *sb; 187 188 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 189 sbuf_clear(sb); 190 g_call_me(g_confdot, sb); 191 do { 192 tsleep(sb, PZERO, "g_dot", hz); 193 } while(!sbuf_done(sb)); 194 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 195 sbuf_delete(sb); 196 return error; 197} 198 199static int 200sysctl_kern_geom_confxml(SYSCTL_HANDLER_ARGS) 201{ 202 int error; 203 struct sbuf *sb; 204 205 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 206 sbuf_clear(sb); 207 g_call_me(g_confxml, sb); 208 do { 209 tsleep(sb, PZERO, "g_xml", hz); 210 } while(!sbuf_done(sb)); 211 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 212 sbuf_delete(sb); 213 return error; 214} 215 216SYSCTL_NODE(_kern, OID_AUTO, geom, CTLFLAG_RW, 0, "GEOMetry management"); 217 218SYSCTL_PROC(_kern_geom, OID_AUTO, confxml, CTLTYPE_STRING|CTLFLAG_RD, 219 0, 0, sysctl_kern_geom_confxml, "A", 220 "Dump the GEOM config in XML"); 221 222SYSCTL_PROC(_kern_geom, OID_AUTO, confdot, CTLTYPE_STRING|CTLFLAG_RD, 223 0, 0, sysctl_kern_geom_confdot, "A", 224 "Dump the GEOM config in dot"); 225 226SYSCTL_PROC(_kern_geom, OID_AUTO, conftxt, CTLTYPE_STRING|CTLFLAG_RD, 227 0, 0, sysctl_kern_geom_conftxt, "A", 228 "Dump the GEOM config in txt"); 229 230SYSCTL_INT(_kern_geom, OID_AUTO, debugflags, CTLFLAG_RW, 231 &g_debugflags, 0, ""); 232 233SYSCTL_INT(_debug_sizeof, OID_AUTO, g_class, CTLFLAG_RD, 234 0, sizeof(struct g_class), ""); 235SYSCTL_INT(_debug_sizeof, OID_AUTO, g_geom, CTLFLAG_RD, 236 0, sizeof(struct g_geom), ""); 237SYSCTL_INT(_debug_sizeof, OID_AUTO, g_provider, CTLFLAG_RD, 238 0, sizeof(struct g_provider), ""); 239SYSCTL_INT(_debug_sizeof, OID_AUTO, g_consumer, CTLFLAG_RD, 240 0, sizeof(struct g_consumer), ""); 241SYSCTL_INT(_debug_sizeof, OID_AUTO, g_bioq, CTLFLAG_RD, 242 0, sizeof(struct g_bioq), ""); 243SYSCTL_INT(_debug_sizeof, OID_AUTO, g_event, CTLFLAG_RD, 244 0, sizeof(struct g_event), ""); 245