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/10.0/sys/geom/geom_kern.c 255860 2013-09-24 20:05:16Z des $");
   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/unistd.h>
   48 #include <sys/kthread.h>
   49 #include <sys/lock.h>
   50 #include <sys/mutex.h>
   51 #include <sys/sbuf.h>
   52 #include <sys/sched.h>
   53 #include <sys/sx.h>
   54 #include <geom/geom.h>
   55 #include <geom/geom_int.h>
   56 
   57 MALLOC_DEFINE(M_GEOM, "GEOM", "Geom data structures");
   58 
   59 struct sx topology_lock;
   60 
   61 static struct proc *g_proc;
   62 static struct thread *g_up_td;
   63 static struct thread *g_down_td;
   64 static struct thread *g_event_td;
   65 
   66 int g_debugflags;
   67 int g_collectstats = 1;
   68 int g_shutdown;
   69 int g_notaste;
   70 
   71 /*
   72  * G_UP and G_DOWN are the two threads which push I/O through the
   73  * stack.
   74  *
   75  * Things are procesed in a FIFO order, but these threads could be
   76  * part of I/O prioritization by deciding which bios/bioqs to service
   77  * in what order.
   78  *
   79  * We have only one thread in each direction, it is belived that until
   80  * a very non-trivial workload in the UP/DOWN path this will be enough,
   81  * but more than one can actually be run without problems.
   82  *
   83  * Holding the "mymutex" is a debugging feature:  It prevents people
   84  * from sleeping in the UP/DOWN I/O path by mistake or design (doing
   85  * so almost invariably result in deadlocks since it stalls all I/O
   86  * processing in the given direction.
   87  */
   88 
   89 static void
   90 g_up_procbody(void *arg)
   91 {
   92 
   93         mtx_assert(&Giant, MA_NOTOWNED);
   94         thread_lock(g_up_td);
   95         sched_prio(g_up_td, PRIBIO);
   96         thread_unlock(g_up_td);
   97         for(;;) {
   98                 g_io_schedule_up(g_up_td);
   99         }
  100 }
  101 
  102 static void
  103 g_down_procbody(void *arg)
  104 {
  105 
  106         mtx_assert(&Giant, MA_NOTOWNED);
  107         thread_lock(g_down_td);
  108         sched_prio(g_down_td, PRIBIO);
  109         thread_unlock(g_down_td);
  110         for(;;) {
  111                 g_io_schedule_down(g_down_td);
  112         }
  113 }
  114 
  115 static void
  116 g_event_procbody(void *arg)
  117 {
  118 
  119         mtx_assert(&Giant, MA_NOTOWNED);
  120         thread_lock(g_event_td);
  121         sched_prio(g_event_td, PRIBIO);
  122         thread_unlock(g_event_td);
  123         g_run_events();
  124         /* NOTREACHED */
  125 }
  126 
  127 static void
  128 geom_shutdown(void *foo __unused)
  129 {
  130 
  131         g_shutdown = 1;
  132 }
  133 
  134 void
  135 g_init(void)
  136 {
  137 
  138         g_trace(G_T_TOPOLOGY, "g_ignition");
  139         sx_init(&topology_lock, "GEOM topology");
  140         g_io_init();
  141         g_event_init();
  142         g_ctl_init();
  143         mtx_lock(&Giant);
  144         kproc_kthread_add(g_event_procbody, NULL, &g_proc, &g_event_td,
  145             RFHIGHPID, 0, "geom", "g_event");
  146         kproc_kthread_add(g_up_procbody, NULL, &g_proc, &g_up_td,
  147             RFHIGHPID, 0, "geom", "g_up");
  148         kproc_kthread_add(g_down_procbody, NULL, &g_proc, &g_down_td,
  149             RFHIGHPID, 0, "geom", "g_down");
  150         mtx_unlock(&Giant);
  151         EVENTHANDLER_REGISTER(shutdown_pre_sync, geom_shutdown, NULL,
  152                 SHUTDOWN_PRI_FIRST);
  153 }
  154 
  155 static int
  156 sysctl_kern_geom_conftxt(SYSCTL_HANDLER_ARGS)
  157 {
  158         int error;
  159         struct sbuf *sb;
  160 
  161         sb = sbuf_new_auto();
  162         g_waitfor_event(g_conftxt, sb, M_WAITOK, NULL);
  163         error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
  164         sbuf_delete(sb);
  165         return error;
  166 }
  167  
  168 static int
  169 sysctl_kern_geom_confdot(SYSCTL_HANDLER_ARGS)
  170 {
  171         int error;
  172         struct sbuf *sb;
  173 
  174         sb = sbuf_new_auto();
  175         g_waitfor_event(g_confdot, 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_confxml(SYSCTL_HANDLER_ARGS)
  183 {
  184         int error;
  185         struct sbuf *sb;
  186 
  187         sb = sbuf_new_auto();
  188         g_waitfor_event(g_confxml, sb, M_WAITOK, NULL);
  189         error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
  190         sbuf_delete(sb);
  191         return error;
  192 }
  193 
  194 SYSCTL_NODE(_kern, OID_AUTO, geom, CTLFLAG_RW, 0, "GEOMetry management");
  195 
  196 SYSCTL_PROC(_kern_geom, OID_AUTO, confxml, CTLTYPE_STRING|CTLFLAG_RD,
  197         0, 0, sysctl_kern_geom_confxml, "",
  198         "Dump the GEOM config in XML");
  199 
  200 SYSCTL_PROC(_kern_geom, OID_AUTO, confdot, CTLTYPE_STRING|CTLFLAG_RD,
  201         0, 0, sysctl_kern_geom_confdot, "",
  202         "Dump the GEOM config in dot");
  203 
  204 SYSCTL_PROC(_kern_geom, OID_AUTO, conftxt, CTLTYPE_STRING|CTLFLAG_RD,
  205         0, 0, sysctl_kern_geom_conftxt, "",
  206         "Dump the GEOM config in txt");
  207 
  208 TUNABLE_INT("kern.geom.debugflags", &g_debugflags);
  209 SYSCTL_INT(_kern_geom, OID_AUTO, debugflags, CTLFLAG_RW,
  210         &g_debugflags, 0, "Set various trace levels for GEOM debugging");
  211 
  212 SYSCTL_INT(_kern_geom, OID_AUTO, notaste, CTLFLAG_RW,
  213         &g_notaste, 0, "Prevent GEOM tasting");
  214 
  215 SYSCTL_INT(_kern_geom, OID_AUTO, collectstats, CTLFLAG_RW,
  216         &g_collectstats, 0,
  217         "Control statistics collection on GEOM providers and consumers");
  218 
  219 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_class, CTLFLAG_RD,
  220         0, sizeof(struct g_class), "sizeof(struct g_class)");
  221 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_geom, CTLFLAG_RD,
  222         0, sizeof(struct g_geom), "sizeof(struct g_geom)");
  223 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_provider, CTLFLAG_RD,
  224         0, sizeof(struct g_provider), "sizeof(struct g_provider)");
  225 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_consumer, CTLFLAG_RD,
  226         0, sizeof(struct g_consumer), "sizeof(struct g_consumer)");
  227 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_bioq, CTLFLAG_RD,
  228         0, sizeof(struct g_bioq), "sizeof(struct g_bioq)");

Cache object: f97a863ede34f065d7132453f6b0ab32


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