geom_kern.c revision 104452
159191Skris/*- 259191Skris * Copyright (c) 2002 Poul-Henning Kamp 359191Skris * Copyright (c) 2002 Networks Associates Technology, Inc. 459191Skris * All rights reserved. 559191Skris * 659191Skris * This software was developed for the FreeBSD Project by Poul-Henning Kamp 759191Skris * and NAI Labs, the Security Research Division of Network Associates, Inc. 859191Skris * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 959191Skris * DARPA CHATS research program. 1059191Skris * 1159191Skris * Redistribution and use in source and binary forms, with or without 1259191Skris * modification, are permitted provided that the following conditions 1359191Skris * are met: 1459191Skris * 1. Redistributions of source code must retain the above copyright 1559191Skris * notice, this list of conditions and the following disclaimer. 1659191Skris * 2. Redistributions in binary form must reproduce the above copyright 1759191Skris * notice, this list of conditions and the following disclaimer in the 1859191Skris * documentation and/or other materials provided with the distribution. 1959191Skris * 3. The names of the authors may not be used to endorse or promote 2059191Skris * products derived from this software without specific prior written 2159191Skris * permission. 2259191Skris * 2359191Skris * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 2459191Skris * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2559191Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2659191Skris * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 2759191Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2859191Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2959191Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3059191Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3159191Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3259191Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3359191Skris * SUCH DAMAGE. 3459191Skris * 3559191Skris * $FreeBSD: head/sys/geom/geom_kern.c 104452 2002-10-04 10:38:36Z phk $ 3659191Skris */ 3759191Skris 3859191Skris#include <sys/param.h> 3959191Skris#include <sys/systm.h> 4059191Skris#include <sys/kernel.h> 4159191Skris#include <sys/malloc.h> 4259191Skris#include <sys/bio.h> 4359191Skris#include <sys/sysctl.h> 4459191Skris#include <sys/proc.h> 4559191Skris#include <sys/kthread.h> 4659191Skris#include <sys/lock.h> 4759191Skris#include <sys/mutex.h> 4859191Skris#include <sys/sx.h> 4959191Skris#include <sys/sbuf.h> 5059191Skris#include <geom/geom.h> 5159191Skris#include <geom/geom_int.h> 5259191Skris 5359191SkrisMALLOC_DEFINE(M_GEOM, "GEOM", "Geom data structures"); 5459191Skris 5559191Skrisstruct sx topology_lock; 5659191Skris 5759191Skrisstatic struct proc *g_up_proc; 5859191Skris 5959191Skrisint g_debugflags; 6059191Skris 6159191Skris/* 6259191Skris * G_UP and G_DOWN are the two threads which push I/O through the 6359191Skris * stack. 6459191Skris * 6559191Skris * Things are procesed in a FIFO order, but these threads could be 6659191Skris * part of I/O prioritization by deciding which bios/bioqs to service 6759191Skris * in what order. 6859191Skris * 6959191Skris * We have only one thread in each direction, it is belived that until 7059191Skris * a very non-trivial workload in the UP/DOWN path this will be enough, 7159191Skris * but more than one can actually be run without problems. 7259191Skris * 7359191Skris * Holding the "mymutex" is a debugging feature: It prevents people 7459191Skris * from sleeping in the UP/DOWN I/O path by mistake or design (doing 7559191Skris * so almost invariably result in deadlocks since it stalls all I/O 7659191Skris * processing in the given direction. 7759191Skris */ 7859191Skris 7959191Skrisstatic void 8059191Skrisg_up_procbody(void) 8159191Skris{ 8259191Skris struct proc *p = g_up_proc; 8359191Skris struct thread *tp = FIRST_THREAD_IN_PROC(p); 8459191Skris struct mtx mymutex; 8559191Skris 8659191Skris bzero(&mymutex, sizeof mymutex); 8759191Skris mtx_init(&mymutex, "g_up", MTX_DEF, 0); 8859191Skris mtx_lock(&mymutex); 8959191Skris tp->td_base_pri = PRIBIO; 9059191Skris for(;;) { 9159191Skris g_io_schedule_up(tp); 9259191Skris msleep(&g_wait_up, &mymutex, PRIBIO, "g_up", hz/10); 9359191Skris } 9459191Skris} 9559191Skris 9659191Skrisstruct kproc_desc g_up_kp = { 9759191Skris "g_up", 9859191Skris g_up_procbody, 9959191Skris &g_up_proc, 10059191Skris}; 10159191Skris 10259191Skrisstatic struct proc *g_down_proc; 10359191Skris 10459191Skrisstatic void 10559191Skrisg_down_procbody(void) 10659191Skris{ 10759191Skris struct proc *p = g_down_proc; 10859191Skris struct thread *tp = FIRST_THREAD_IN_PROC(p); 10959191Skris struct mtx mymutex; 11059191Skris 11159191Skris bzero(&mymutex, sizeof mymutex); 11259191Skris mtx_init(&mymutex, "g_down", MTX_DEF, 0); 11359191Skris mtx_lock(&mymutex); 11459191Skris tp->td_base_pri = PRIBIO; 11559191Skris for(;;) { 11659191Skris g_io_schedule_down(tp); 11759191Skris msleep(&g_wait_down, &mymutex, PRIBIO, "g_down", hz/10); 11859191Skris } 11959191Skris} 12059191Skris 12159191Skrisstruct kproc_desc g_down_kp = { 12259191Skris "g_down", 12359191Skris g_down_procbody, 12459191Skris &g_down_proc, 12559191Skris}; 12659191Skris 12759191Skrisstatic struct proc *g_event_proc; 12859191Skris 12959191Skrisstatic void 13059191Skrisg_event_procbody(void) 13159191Skris{ 13259191Skris struct proc *p = g_down_proc; 13359191Skris struct thread *tp = FIRST_THREAD_IN_PROC(p); 13459191Skris 13559191Skris tp->td_base_pri = PRIBIO; 13659191Skris for(;;) { 13759191Skris g_run_events(); 13859191Skris tsleep(&g_wait_event, PRIBIO, "g_events", hz/10); 13959191Skris } 14059191Skris} 14159191Skris 14259191Skrisstruct kproc_desc g_event_kp = { 14359191Skris "g_event", 14459191Skris g_event_procbody, 14559191Skris &g_event_proc, 14659191Skris}; 14759191Skris 14859191Skrisvoid 14959191Skrisg_init(void) 15059191Skris{ 15159191Skris printf("Initializing GEOMetry subsystem\n"); 15259191Skris if (bootverbose) 15359191Skris g_debugflags |= G_T_TOPOLOGY; 15459191Skris sx_init(&topology_lock, "GEOM topology"); 15559191Skris g_io_init(); 15659191Skris g_event_init(); 15759191Skris mtx_lock(&Giant); 15859191Skris kproc_start(&g_event_kp); 15959191Skris kproc_start(&g_up_kp); 16059191Skris kproc_start(&g_down_kp); 16159191Skris mtx_unlock(&Giant); 16259191Skris} 16359191Skris 16459191Skrisstatic int 16559191Skrissysctl_kern_geom_confdot(SYSCTL_HANDLER_ARGS) 16659191Skris{ 16759191Skris int error; 16859191Skris struct sbuf *sb; 16959191Skris 17059191Skris sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 17159191Skris sbuf_clear(sb); 17259191Skris g_call_me(g_confdot, sb); 17359191Skris do { 17459191Skris tsleep(sb, PZERO, "g_dot", hz); 17559191Skris } while(!sbuf_done(sb)); 17659191Skris error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb)); 17759191Skris sbuf_delete(sb); 17859191Skris return error; 17959191Skris} 18059191Skris 18159191Skrisstatic int 18259191Skrissysctl_kern_geom_confxml(SYSCTL_HANDLER_ARGS) 18359191Skris{ 18459191Skris int error; 18559191Skris struct sbuf *sb; 18659191Skris 18759191Skris sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 18859191Skris sbuf_clear(sb); 189 g_call_me(g_confxml, sb); 190 do { 191 tsleep(sb, PZERO, "g_xml", hz); 192 } while(!sbuf_done(sb)); 193 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb)); 194 sbuf_delete(sb); 195 return error; 196} 197 198SYSCTL_NODE(_kern, OID_AUTO, geom, CTLFLAG_RW, 0, "GEOMetry management"); 199 200SYSCTL_PROC(_kern_geom, OID_AUTO, confxml, CTLTYPE_STRING|CTLFLAG_RD, 201 0, 0, sysctl_kern_geom_confxml, "A", 202 "Dump the GEOM config"); 203 204SYSCTL_PROC(_kern_geom, OID_AUTO, confdot, CTLTYPE_STRING|CTLFLAG_RD, 205 0, 0, sysctl_kern_geom_confdot, "A", 206 "Dump the GEOM config"); 207 208SYSCTL_INT(_kern_geom, OID_AUTO, debugflags, CTLTYPE_INT|CTLFLAG_RW, 209 &g_debugflags, 0, ""); 210 211SYSCTL_INT(_debug_sizeof, OID_AUTO, g_class, CTLTYPE_INT|CTLFLAG_RD, 212 0, sizeof(struct g_class), ""); 213SYSCTL_INT(_debug_sizeof, OID_AUTO, g_geom, CTLTYPE_INT|CTLFLAG_RD, 214 0, sizeof(struct g_geom), ""); 215SYSCTL_INT(_debug_sizeof, OID_AUTO, g_provider, CTLTYPE_INT|CTLFLAG_RD, 216 0, sizeof(struct g_provider), ""); 217SYSCTL_INT(_debug_sizeof, OID_AUTO, g_consumer, CTLTYPE_INT|CTLFLAG_RD, 218 0, sizeof(struct g_consumer), ""); 219SYSCTL_INT(_debug_sizeof, OID_AUTO, g_bioq, CTLTYPE_INT|CTLFLAG_RD, 220 0, sizeof(struct g_bioq), ""); 221SYSCTL_INT(_debug_sizeof, OID_AUTO, g_event, CTLTYPE_INT|CTLFLAG_RD, 222 0, sizeof(struct g_event), ""); 223