The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_kern.c

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    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: releng/5.1/sys/geom/geom_kern.c 114293 2003-04-30 12:57:40Z markm $
   36  */
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/kernel.h>
   41 #include <sys/eventhandler.h>
   42 #include <sys/malloc.h>
   43 #include <sys/bio.h>
   44 #include <sys/sysctl.h>
   45 #include <sys/proc.h>
   46 #include <sys/kthread.h>
   47 #include <sys/lock.h>
   48 #include <sys/mutex.h>
   49 #include <sys/sx.h>
   50 #include <sys/sbuf.h>
   51 #include <geom/geom.h>
   52 #include <geom/geom_int.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 int g_shutdown;
   63 
   64 /*
   65  * G_UP and G_DOWN are the two threads which push I/O through the
   66  * stack.
   67  *
   68  * Things are procesed in a FIFO order, but these threads could be
   69  * part of I/O prioritization by deciding which bios/bioqs to service
   70  * in what order.
   71  *
   72  * We have only one thread in each direction, it is belived that until
   73  * a very non-trivial workload in the UP/DOWN path this will be enough,
   74  * but more than one can actually be run without problems.
   75  *
   76  * Holding the "mymutex" is a debugging feature:  It prevents people
   77  * from sleeping in the UP/DOWN I/O path by mistake or design (doing
   78  * so almost invariably result in deadlocks since it stalls all I/O
   79  * processing in the given direction.
   80  */
   81 
   82 static void
   83 g_up_procbody(void)
   84 {
   85         struct proc *p = g_up_proc;
   86         struct thread *tp = FIRST_THREAD_IN_PROC(p);
   87 
   88         mtx_assert(&Giant, MA_NOTOWNED);
   89         tp->td_base_pri = PRIBIO;
   90         for(;;) {
   91                 g_io_schedule_up(tp);
   92         }
   93 }
   94 
   95 struct kproc_desc g_up_kp = {
   96         "g_up",
   97         g_up_procbody,
   98         &g_up_proc,
   99 };
  100 
  101 static struct proc *g_down_proc;
  102 
  103 static void
  104 g_down_procbody(void)
  105 {
  106         struct proc *p = g_down_proc;
  107         struct thread *tp = FIRST_THREAD_IN_PROC(p);
  108 
  109         mtx_assert(&Giant, MA_NOTOWNED);
  110         tp->td_base_pri = PRIBIO;
  111         for(;;) {
  112                 g_io_schedule_down(tp);
  113         }
  114 }
  115 
  116 struct kproc_desc g_down_kp = {
  117         "g_down",
  118         g_down_procbody,
  119         &g_down_proc,
  120 };
  121 
  122 static struct proc *g_event_proc;
  123 
  124 static void
  125 g_event_procbody(void)
  126 {
  127         struct proc *p = g_event_proc;
  128         struct thread *tp = FIRST_THREAD_IN_PROC(p);
  129 
  130         mtx_assert(&Giant, MA_NOTOWNED);
  131         tp->td_base_pri = PRIBIO;
  132         for(;;) {
  133                 g_run_events();
  134                 tsleep(&g_wait_event, PRIBIO, "g_events", hz/10);
  135         }
  136 }
  137 
  138 static struct kproc_desc g_event_kp = {
  139         "g_event",
  140         g_event_procbody,
  141         &g_event_proc,
  142 };
  143 
  144 static void
  145 geom_shutdown(void *foo __unused)
  146 {
  147 
  148         g_shutdown = 1;
  149 }
  150 
  151 void
  152 g_init(void)
  153 {
  154         sx_init(&topology_lock, "GEOM topology");
  155         g_io_init();
  156         g_event_init();
  157         g_ctl_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         EVENTHANDLER_REGISTER(shutdown_pre_sync, geom_shutdown, NULL,
  164                 SHUTDOWN_PRI_FIRST);
  165 }
  166 
  167 static int
  168 sysctl_kern_geom_conftxt(SYSCTL_HANDLER_ARGS)
  169 {
  170         int error;
  171         struct sbuf *sb;
  172 
  173         sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND);
  174         sbuf_clear(sb);
  175         g_waitfor_event(g_conftxt, sb, M_WAITOK, NULL);
  176         error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
  177         sbuf_delete(sb);
  178         return error;
  179 }
  180  
  181 static int
  182 sysctl_kern_geom_confdot(SYSCTL_HANDLER_ARGS)
  183 {
  184         int error;
  185         struct sbuf *sb;
  186 
  187         sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND);
  188         sbuf_clear(sb);
  189         g_waitfor_event(g_confdot, sb, M_WAITOK, NULL);
  190         error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
  191         sbuf_delete(sb);
  192         return error;
  193 }
  194  
  195 static int
  196 sysctl_kern_geom_confxml(SYSCTL_HANDLER_ARGS)
  197 {
  198         int error;
  199         struct sbuf *sb;
  200 
  201         sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND);
  202         sbuf_clear(sb);
  203         g_waitfor_event(g_confxml, sb, M_WAITOK, NULL);
  204         error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
  205         sbuf_delete(sb);
  206         return error;
  207 }
  208 
  209 SYSCTL_NODE(_kern, OID_AUTO, geom, CTLFLAG_RW, 0, "GEOMetry management");
  210 
  211 SYSCTL_PROC(_kern_geom, OID_AUTO, confxml, CTLTYPE_STRING|CTLFLAG_RD,
  212         0, 0, sysctl_kern_geom_confxml, "",
  213         "Dump the GEOM config in XML");
  214 
  215 SYSCTL_PROC(_kern_geom, OID_AUTO, confdot, CTLTYPE_STRING|CTLFLAG_RD,
  216         0, 0, sysctl_kern_geom_confdot, "",
  217         "Dump the GEOM config in dot");
  218 
  219 SYSCTL_PROC(_kern_geom, OID_AUTO, conftxt, CTLTYPE_STRING|CTLFLAG_RD,
  220         0, 0, sysctl_kern_geom_conftxt, "",
  221         "Dump the GEOM config in txt");
  222 
  223 SYSCTL_INT(_kern_geom, OID_AUTO, debugflags, CTLFLAG_RW,
  224         &g_debugflags, 0, "");
  225 
  226 SYSCTL_INT(_kern_geom, OID_AUTO, collectstats, CTLFLAG_RW,
  227         &g_collectstats, 0, "");
  228 
  229 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_class, CTLFLAG_RD,
  230         0, sizeof(struct g_class), "");
  231 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_geom, CTLFLAG_RD,
  232         0, sizeof(struct g_geom), "");
  233 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_provider, CTLFLAG_RD,
  234         0, sizeof(struct g_provider), "");
  235 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_consumer, CTLFLAG_RD,
  236         0, sizeof(struct g_consumer), "");
  237 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_bioq, CTLFLAG_RD,
  238         0, sizeof(struct g_bioq), "");

Cache object: 8dabe56c473b63ef5cac7185433d31fc


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