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 
   36 #include <sys/cdefs.h>
   37 __FBSDID("$FreeBSD: releng/8.3/sys/geom/geom_kern.c 219378 2011-03-07 15:24:35Z jh $");
   38 
   39 #include <sys/param.h>
   40 #include <sys/systm.h>
   41 #include <sys/kernel.h>
   42 #include <sys/eventhandler.h>
   43 #include <sys/malloc.h>
   44 #include <sys/bio.h>
   45 #include <sys/sysctl.h>
   46 #include <sys/proc.h>
   47 #include <sys/kthread.h>
   48 #include <sys/lock.h>
   49 #include <sys/mutex.h>
   50 #include <sys/sbuf.h>
   51 #include <sys/sched.h>
   52 #include <sys/sx.h>
   53 #include <geom/geom.h>
   54 #include <geom/geom_int.h>
   55 
   56 MALLOC_DEFINE(M_GEOM, "GEOM", "Geom data structures");
   57 
   58 struct sx topology_lock;
   59 
   60 static struct proc *g_up_proc;
   61 
   62 int g_debugflags;
   63 int g_collectstats = 1;
   64 int g_shutdown;
   65 
   66 /*
   67  * G_UP and G_DOWN are the two threads which push I/O through the
   68  * stack.
   69  *
   70  * Things are procesed in a FIFO order, but these threads could be
   71  * part of I/O prioritization by deciding which bios/bioqs to service
   72  * in what order.
   73  *
   74  * We have only one thread in each direction, it is belived that until
   75  * a very non-trivial workload in the UP/DOWN path this will be enough,
   76  * but more than one can actually be run without problems.
   77  *
   78  * Holding the "mymutex" is a debugging feature:  It prevents people
   79  * from sleeping in the UP/DOWN I/O path by mistake or design (doing
   80  * so almost invariably result in deadlocks since it stalls all I/O
   81  * processing in the given direction.
   82  */
   83 
   84 static void
   85 g_up_procbody(void)
   86 {
   87         struct proc *p = g_up_proc;
   88         struct thread *tp = FIRST_THREAD_IN_PROC(p);
   89 
   90         mtx_assert(&Giant, MA_NOTOWNED);
   91         thread_lock(tp);
   92         sched_prio(tp, PRIBIO);
   93         thread_unlock(tp);
   94         for(;;) {
   95                 g_io_schedule_up(tp);
   96         }
   97 }
   98 
   99 static struct kproc_desc g_up_kp = {
  100         "g_up",
  101         g_up_procbody,
  102         &g_up_proc,
  103 };
  104 
  105 static struct proc *g_down_proc;
  106 
  107 static void
  108 g_down_procbody(void)
  109 {
  110         struct proc *p = g_down_proc;
  111         struct thread *tp = FIRST_THREAD_IN_PROC(p);
  112 
  113         mtx_assert(&Giant, MA_NOTOWNED);
  114         thread_lock(tp);
  115         sched_prio(tp, PRIBIO);
  116         thread_unlock(tp);
  117         for(;;) {
  118                 g_io_schedule_down(tp);
  119         }
  120 }
  121 
  122 static struct kproc_desc g_down_kp = {
  123         "g_down",
  124         g_down_procbody,
  125         &g_down_proc,
  126 };
  127 
  128 static struct proc *g_event_proc;
  129 
  130 static void
  131 g_event_procbody(void)
  132 {
  133         struct proc *p = g_event_proc;
  134         struct thread *tp = FIRST_THREAD_IN_PROC(p);
  135 
  136         mtx_assert(&Giant, MA_NOTOWNED);
  137         thread_lock(tp);
  138         sched_prio(tp, PRIBIO);
  139         thread_unlock(tp);
  140         g_run_events();
  141         /* NOTREACHED */
  142 }
  143 
  144 static struct kproc_desc g_event_kp = {
  145         "g_event",
  146         g_event_procbody,
  147         &g_event_proc,
  148 };
  149 
  150 static void
  151 geom_shutdown(void *foo __unused)
  152 {
  153 
  154         g_shutdown = 1;
  155 }
  156 
  157 void
  158 g_init(void)
  159 {
  160 
  161         g_trace(G_T_TOPOLOGY, "g_ignition");
  162         sx_init(&topology_lock, "GEOM topology");
  163         g_io_init();
  164         g_event_init();
  165         g_ctl_init();
  166         mtx_lock(&Giant);
  167         kproc_start(&g_event_kp);
  168         kproc_start(&g_up_kp);
  169         kproc_start(&g_down_kp);
  170         mtx_unlock(&Giant);
  171         EVENTHANDLER_REGISTER(shutdown_pre_sync, geom_shutdown, NULL,
  172                 SHUTDOWN_PRI_FIRST);
  173 }
  174 
  175 static int
  176 sysctl_kern_geom_conftxt(SYSCTL_HANDLER_ARGS)
  177 {
  178         int error;
  179         struct sbuf *sb;
  180 
  181         sb = sbuf_new_auto();
  182         g_waitfor_event(g_conftxt, sb, M_WAITOK, NULL);
  183         error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
  184         sbuf_delete(sb);
  185         return error;
  186 }
  187  
  188 static int
  189 sysctl_kern_geom_confdot(SYSCTL_HANDLER_ARGS)
  190 {
  191         int error;
  192         struct sbuf *sb;
  193 
  194         sb = sbuf_new_auto();
  195         g_waitfor_event(g_confdot, sb, M_WAITOK, NULL);
  196         error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
  197         sbuf_delete(sb);
  198         return error;
  199 }
  200  
  201 static int
  202 sysctl_kern_geom_confxml(SYSCTL_HANDLER_ARGS)
  203 {
  204         int error;
  205         struct sbuf *sb;
  206 
  207         sb = sbuf_new_auto();
  208         g_waitfor_event(g_confxml, sb, M_WAITOK, NULL);
  209         error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
  210         sbuf_delete(sb);
  211         return error;
  212 }
  213 
  214 SYSCTL_NODE(_kern, OID_AUTO, geom, CTLFLAG_RW, 0, "GEOMetry management");
  215 
  216 SYSCTL_PROC(_kern_geom, OID_AUTO, confxml, CTLTYPE_STRING|CTLFLAG_RD,
  217         0, 0, sysctl_kern_geom_confxml, "",
  218         "Dump the GEOM config in XML");
  219 
  220 SYSCTL_PROC(_kern_geom, OID_AUTO, confdot, CTLTYPE_STRING|CTLFLAG_RD,
  221         0, 0, sysctl_kern_geom_confdot, "",
  222         "Dump the GEOM config in dot");
  223 
  224 SYSCTL_PROC(_kern_geom, OID_AUTO, conftxt, CTLTYPE_STRING|CTLFLAG_RD,
  225         0, 0, sysctl_kern_geom_conftxt, "",
  226         "Dump the GEOM config in txt");
  227 
  228 TUNABLE_INT("kern.geom.debugflags", &g_debugflags);
  229 SYSCTL_INT(_kern_geom, OID_AUTO, debugflags, CTLFLAG_RW,
  230         &g_debugflags, 0, "Set various trace levels for GEOM debugging");
  231 
  232 SYSCTL_INT(_kern_geom, OID_AUTO, collectstats, CTLFLAG_RW,
  233         &g_collectstats, 0,
  234         "Control statistics collection on GEOM providers and consumers");
  235 
  236 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_class, CTLFLAG_RD,
  237         0, sizeof(struct g_class), "sizeof(struct g_class)");
  238 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_geom, CTLFLAG_RD,
  239         0, sizeof(struct g_geom), "sizeof(struct g_geom)");
  240 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_provider, CTLFLAG_RD,
  241         0, sizeof(struct g_provider), "sizeof(struct g_provider)");
  242 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_consumer, CTLFLAG_RD,
  243         0, sizeof(struct g_consumer), "sizeof(struct g_consumer)");
  244 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_bioq, CTLFLAG_RD,
  245         0, sizeof(struct g_bioq), "sizeof(struct g_bioq)");

Cache object: f9758460fbd26f68b6734fade6827f56


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