geom_kern.c revision 116522
192108Sphk/*- 292108Sphk * Copyright (c) 2002 Poul-Henning Kamp 392108Sphk * Copyright (c) 2002 Networks Associates Technology, Inc. 492108Sphk * All rights reserved. 592108Sphk * 692108Sphk * This software was developed for the FreeBSD Project by Poul-Henning Kamp 792108Sphk * and NAI Labs, the Security Research Division of Network Associates, Inc. 892108Sphk * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 992108Sphk * DARPA CHATS research program. 1092108Sphk * 1192108Sphk * Redistribution and use in source and binary forms, with or without 1292108Sphk * modification, are permitted provided that the following conditions 1392108Sphk * are met: 1492108Sphk * 1. Redistributions of source code must retain the above copyright 1592108Sphk * notice, this list of conditions and the following disclaimer. 1692108Sphk * 2. Redistributions in binary form must reproduce the above copyright 1792108Sphk * notice, this list of conditions and the following disclaimer in the 1892108Sphk * documentation and/or other materials provided with the distribution. 1992108Sphk * 3. The names of the authors may not be used to endorse or promote 2092108Sphk * products derived from this software without specific prior written 2192108Sphk * permission. 2292108Sphk * 2392108Sphk * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 2492108Sphk * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2592108Sphk * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2692108Sphk * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 2792108Sphk * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2892108Sphk * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2992108Sphk * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3092108Sphk * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3192108Sphk * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3292108Sphk * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3392108Sphk * SUCH DAMAGE. 3492108Sphk */ 3592108Sphk 36116196Sobrien#include <sys/cdefs.h> 37116196Sobrien__FBSDID("$FreeBSD: head/sys/geom/geom_kern.c 116522 2003-06-18 10:33:09Z phk $"); 38116196Sobrien 3992108Sphk#include <sys/param.h> 4092108Sphk#include <sys/systm.h> 4192108Sphk#include <sys/kernel.h> 42113926Sphk#include <sys/eventhandler.h> 4392108Sphk#include <sys/malloc.h> 4492108Sphk#include <sys/bio.h> 4592108Sphk#include <sys/sysctl.h> 4692108Sphk#include <sys/proc.h> 4792108Sphk#include <sys/kthread.h> 4892108Sphk#include <sys/lock.h> 4992108Sphk#include <sys/mutex.h> 5092108Sphk#include <sys/sx.h> 5192108Sphk#include <sys/sbuf.h> 5292108Sphk#include <geom/geom.h> 5393250Sphk#include <geom/geom_int.h> 5492108Sphk 5592108SphkMALLOC_DEFINE(M_GEOM, "GEOM", "Geom data structures"); 5692108Sphk 5792108Sphkstruct sx topology_lock; 5892108Sphk 5992108Sphkstatic struct proc *g_up_proc; 6092108Sphk 6192108Sphkint g_debugflags; 62110592Sphkint g_collectstats = 1; 63113926Sphkint g_shutdown; 6492108Sphk 65104063Sphk/* 66104063Sphk * G_UP and G_DOWN are the two threads which push I/O through the 67104063Sphk * stack. 68104063Sphk * 69104063Sphk * Things are procesed in a FIFO order, but these threads could be 70104063Sphk * part of I/O prioritization by deciding which bios/bioqs to service 71104063Sphk * in what order. 72104063Sphk * 73104063Sphk * We have only one thread in each direction, it is belived that until 74104063Sphk * a very non-trivial workload in the UP/DOWN path this will be enough, 75104063Sphk * but more than one can actually be run without problems. 76104063Sphk * 77104063Sphk * Holding the "mymutex" is a debugging feature: It prevents people 78104063Sphk * from sleeping in the UP/DOWN I/O path by mistake or design (doing 79104063Sphk * so almost invariably result in deadlocks since it stalls all I/O 80104063Sphk * processing in the given direction. 81104063Sphk */ 82104063Sphk 8392108Sphkstatic void 8492108Sphkg_up_procbody(void) 8592108Sphk{ 8692108Sphk struct proc *p = g_up_proc; 8799028Sjulian struct thread *tp = FIRST_THREAD_IN_PROC(p); 8892108Sphk 89108296Sphk mtx_assert(&Giant, MA_NOTOWNED); 90104087Sphk tp->td_base_pri = PRIBIO; 9192108Sphk for(;;) { 9292108Sphk g_io_schedule_up(tp); 9392108Sphk } 9492108Sphk} 9592108Sphk 9692108Sphkstruct kproc_desc g_up_kp = { 9792108Sphk "g_up", 9892108Sphk g_up_procbody, 9992108Sphk &g_up_proc, 10092108Sphk}; 10192108Sphk 10292108Sphkstatic struct proc *g_down_proc; 10392108Sphk 10492108Sphkstatic void 10592108Sphkg_down_procbody(void) 10692108Sphk{ 10792108Sphk struct proc *p = g_down_proc; 10899028Sjulian struct thread *tp = FIRST_THREAD_IN_PROC(p); 10992108Sphk 110108296Sphk mtx_assert(&Giant, MA_NOTOWNED); 111104087Sphk tp->td_base_pri = PRIBIO; 11292108Sphk for(;;) { 11392108Sphk g_io_schedule_down(tp); 11492108Sphk } 11592108Sphk} 11692108Sphk 11792108Sphkstruct kproc_desc g_down_kp = { 11892108Sphk "g_down", 11992108Sphk g_down_procbody, 12092108Sphk &g_down_proc, 12192108Sphk}; 12292108Sphk 12392108Sphkstatic struct proc *g_event_proc; 12492108Sphk 12592108Sphkstatic void 12692108Sphkg_event_procbody(void) 12792108Sphk{ 128107452Sphk struct proc *p = g_event_proc; 129104087Sphk struct thread *tp = FIRST_THREAD_IN_PROC(p); 13092108Sphk 131108296Sphk mtx_assert(&Giant, MA_NOTOWNED); 132104087Sphk tp->td_base_pri = PRIBIO; 13392108Sphk for(;;) { 13493250Sphk g_run_events(); 135116522Sphk tsleep(&g_wait_event, PRIBIO, "-", hz/10); 13692108Sphk } 13792108Sphk} 13892108Sphk 139114293Smarkmstatic struct kproc_desc g_event_kp = { 14092108Sphk "g_event", 14192108Sphk g_event_procbody, 14292108Sphk &g_event_proc, 14392108Sphk}; 14492108Sphk 145113926Sphkstatic void 146113926Sphkgeom_shutdown(void *foo __unused) 147113926Sphk{ 148113926Sphk 149113926Sphk g_shutdown = 1; 150113926Sphk} 151113926Sphk 15292108Sphkvoid 15392108Sphkg_init(void) 15492108Sphk{ 155116522Sphk 156116522Sphk g_trace(G_T_TOPOLOGY, "g_ignition"); 15792108Sphk sx_init(&topology_lock, "GEOM topology"); 15892108Sphk g_io_init(); 15992108Sphk g_event_init(); 160112534Sphk g_ctl_init(); 16192108Sphk mtx_lock(&Giant); 16292108Sphk kproc_start(&g_event_kp); 16392108Sphk kproc_start(&g_up_kp); 16492108Sphk kproc_start(&g_down_kp); 16592108Sphk mtx_unlock(&Giant); 166113926Sphk EVENTHANDLER_REGISTER(shutdown_pre_sync, geom_shutdown, NULL, 167113926Sphk SHUTDOWN_PRI_FIRST); 16892108Sphk} 16992108Sphk 17092108Sphkstatic int 171106101Sphksysctl_kern_geom_conftxt(SYSCTL_HANDLER_ARGS) 172106101Sphk{ 173106101Sphk int error; 174106101Sphk struct sbuf *sb; 175106101Sphk 176106101Sphk sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 177106101Sphk sbuf_clear(sb); 178113940Sphk g_waitfor_event(g_conftxt, sb, M_WAITOK, NULL); 179106101Sphk error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 180106101Sphk sbuf_delete(sb); 181106101Sphk return error; 182106101Sphk} 183106101Sphk 184106101Sphkstatic int 185104452Sphksysctl_kern_geom_confdot(SYSCTL_HANDLER_ARGS) 18692108Sphk{ 187104452Sphk int error; 18892108Sphk struct sbuf *sb; 18992108Sphk 190104452Sphk sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 191104452Sphk sbuf_clear(sb); 192113940Sphk g_waitfor_event(g_confdot, sb, M_WAITOK, NULL); 193105358Sphk error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 19492108Sphk sbuf_delete(sb); 195104452Sphk return error; 19692108Sphk} 197104452Sphk 19892108Sphkstatic int 199104452Sphksysctl_kern_geom_confxml(SYSCTL_HANDLER_ARGS) 20092108Sphk{ 201104452Sphk int error; 20292108Sphk struct sbuf *sb; 20392108Sphk 204104452Sphk sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 205104452Sphk sbuf_clear(sb); 206113940Sphk g_waitfor_event(g_confxml, sb, M_WAITOK, NULL); 207105358Sphk error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 20892108Sphk sbuf_delete(sb); 209104452Sphk return error; 21092108Sphk} 21192108Sphk 212104359SphkSYSCTL_NODE(_kern, OID_AUTO, geom, CTLFLAG_RW, 0, "GEOMetry management"); 213104359Sphk 214104452SphkSYSCTL_PROC(_kern_geom, OID_AUTO, confxml, CTLTYPE_STRING|CTLFLAG_RD, 215108308Sphk 0, 0, sysctl_kern_geom_confxml, "", 216106101Sphk "Dump the GEOM config in XML"); 21792108Sphk 218104452SphkSYSCTL_PROC(_kern_geom, OID_AUTO, confdot, CTLTYPE_STRING|CTLFLAG_RD, 219108308Sphk 0, 0, sysctl_kern_geom_confdot, "", 220106101Sphk "Dump the GEOM config in dot"); 221104359Sphk 222106101SphkSYSCTL_PROC(_kern_geom, OID_AUTO, conftxt, CTLTYPE_STRING|CTLFLAG_RD, 223108308Sphk 0, 0, sysctl_kern_geom_conftxt, "", 224106101Sphk "Dump the GEOM config in txt"); 225106101Sphk 226105581SphkSYSCTL_INT(_kern_geom, OID_AUTO, debugflags, CTLFLAG_RW, 22792108Sphk &g_debugflags, 0, ""); 22892108Sphk 229110523SphkSYSCTL_INT(_kern_geom, OID_AUTO, collectstats, CTLFLAG_RW, 230110523Sphk &g_collectstats, 0, ""); 231110523Sphk 232105581SphkSYSCTL_INT(_debug_sizeof, OID_AUTO, g_class, CTLFLAG_RD, 23393248Sphk 0, sizeof(struct g_class), ""); 234105581SphkSYSCTL_INT(_debug_sizeof, OID_AUTO, g_geom, CTLFLAG_RD, 23592108Sphk 0, sizeof(struct g_geom), ""); 236105581SphkSYSCTL_INT(_debug_sizeof, OID_AUTO, g_provider, CTLFLAG_RD, 23792108Sphk 0, sizeof(struct g_provider), ""); 238105581SphkSYSCTL_INT(_debug_sizeof, OID_AUTO, g_consumer, CTLFLAG_RD, 23992108Sphk 0, sizeof(struct g_consumer), ""); 240105581SphkSYSCTL_INT(_debug_sizeof, OID_AUTO, g_bioq, CTLFLAG_RD, 24192108Sphk 0, sizeof(struct g_bioq), ""); 242