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/9.0/sys/geom/geom_kern.c 221792 2011-05-11 21:47:30Z thompsa $");
   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 
   70 /*
   71  * G_UP and G_DOWN are the two threads which push I/O through the
   72  * stack.
   73  *
   74  * Things are procesed in a FIFO order, but these threads could be
   75  * part of I/O prioritization by deciding which bios/bioqs to service
   76  * in what order.
   77  *
   78  * We have only one thread in each direction, it is belived that until
   79  * a very non-trivial workload in the UP/DOWN path this will be enough,
   80  * but more than one can actually be run without problems.
   81  *
   82  * Holding the "mymutex" is a debugging feature:  It prevents people
   83  * from sleeping in the UP/DOWN I/O path by mistake or design (doing
   84  * so almost invariably result in deadlocks since it stalls all I/O
   85  * processing in the given direction.
   86  */
   87 
   88 static void
   89 g_up_procbody(void *arg)
   90 {
   91 
   92         mtx_assert(&Giant, MA_NOTOWNED);
   93         thread_lock(g_up_td);
   94         sched_prio(g_up_td, PRIBIO);
   95         thread_unlock(g_up_td);
   96         for(;;) {
   97                 g_io_schedule_up(g_up_td);
   98         }
   99 }
  100 
  101 static void
  102 g_down_procbody(void *arg)
  103 {
  104 
  105         mtx_assert(&Giant, MA_NOTOWNED);
  106         thread_lock(g_down_td);
  107         sched_prio(g_down_td, PRIBIO);
  108         thread_unlock(g_down_td);
  109         for(;;) {
  110                 g_io_schedule_down(g_down_td);
  111         }
  112 }
  113 
  114 static void
  115 g_event_procbody(void *arg)
  116 {
  117 
  118         mtx_assert(&Giant, MA_NOTOWNED);
  119         thread_lock(g_event_td);
  120         sched_prio(g_event_td, PRIBIO);
  121         thread_unlock(g_event_td);
  122         g_run_events();
  123         /* NOTREACHED */
  124 }
  125 
  126 static void
  127 geom_shutdown(void *foo __unused)
  128 {
  129 
  130         g_shutdown = 1;
  131 }
  132 
  133 void
  134 g_init(void)
  135 {
  136 
  137         g_trace(G_T_TOPOLOGY, "g_ignition");
  138         sx_init(&topology_lock, "GEOM topology");
  139         g_io_init();
  140         g_event_init();
  141         g_ctl_init();
  142         mtx_lock(&Giant);
  143         kproc_kthread_add(g_event_procbody, NULL, &g_proc, &g_event_td,
  144             RFHIGHPID, 0, "geom", "g_event");
  145         kproc_kthread_add(g_up_procbody, NULL, &g_proc, &g_up_td,
  146             RFHIGHPID, 0, "geom", "g_up");
  147         kproc_kthread_add(g_down_procbody, NULL, &g_proc, &g_down_td,
  148             RFHIGHPID, 0, "geom", "g_down");
  149         mtx_unlock(&Giant);
  150         EVENTHANDLER_REGISTER(shutdown_pre_sync, geom_shutdown, NULL,
  151                 SHUTDOWN_PRI_FIRST);
  152 }
  153 
  154 static int
  155 sysctl_kern_geom_conftxt(SYSCTL_HANDLER_ARGS)
  156 {
  157         int error;
  158         struct sbuf *sb;
  159 
  160         sb = sbuf_new_auto();
  161         g_waitfor_event(g_conftxt, sb, M_WAITOK, NULL);
  162         error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
  163         sbuf_delete(sb);
  164         return error;
  165 }
  166  
  167 static int
  168 sysctl_kern_geom_confdot(SYSCTL_HANDLER_ARGS)
  169 {
  170         int error;
  171         struct sbuf *sb;
  172 
  173         sb = sbuf_new_auto();
  174         g_waitfor_event(g_confdot, sb, M_WAITOK, NULL);
  175         error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
  176         sbuf_delete(sb);
  177         return error;
  178 }
  179  
  180 static int
  181 sysctl_kern_geom_confxml(SYSCTL_HANDLER_ARGS)
  182 {
  183         int error;
  184         struct sbuf *sb;
  185 
  186         sb = sbuf_new_auto();
  187         g_waitfor_event(g_confxml, sb, M_WAITOK, NULL);
  188         error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
  189         sbuf_delete(sb);
  190         return error;
  191 }
  192 
  193 SYSCTL_NODE(_kern, OID_AUTO, geom, CTLFLAG_RW, 0, "GEOMetry management");
  194 
  195 SYSCTL_PROC(_kern_geom, OID_AUTO, confxml, CTLTYPE_STRING|CTLFLAG_RD,
  196         0, 0, sysctl_kern_geom_confxml, "",
  197         "Dump the GEOM config in XML");
  198 
  199 SYSCTL_PROC(_kern_geom, OID_AUTO, confdot, CTLTYPE_STRING|CTLFLAG_RD,
  200         0, 0, sysctl_kern_geom_confdot, "",
  201         "Dump the GEOM config in dot");
  202 
  203 SYSCTL_PROC(_kern_geom, OID_AUTO, conftxt, CTLTYPE_STRING|CTLFLAG_RD,
  204         0, 0, sysctl_kern_geom_conftxt, "",
  205         "Dump the GEOM config in txt");
  206 
  207 TUNABLE_INT("kern.geom.debugflags", &g_debugflags);
  208 SYSCTL_INT(_kern_geom, OID_AUTO, debugflags, CTLFLAG_RW,
  209         &g_debugflags, 0, "Set various trace levels for GEOM debugging");
  210 
  211 SYSCTL_INT(_kern_geom, OID_AUTO, collectstats, CTLFLAG_RW,
  212         &g_collectstats, 0,
  213         "Control statistics collection on GEOM providers and consumers");
  214 
  215 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_class, CTLFLAG_RD,
  216         0, sizeof(struct g_class), "sizeof(struct g_class)");
  217 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_geom, CTLFLAG_RD,
  218         0, sizeof(struct g_geom), "sizeof(struct g_geom)");
  219 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_provider, CTLFLAG_RD,
  220         0, sizeof(struct g_provider), "sizeof(struct g_provider)");
  221 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_consumer, CTLFLAG_RD,
  222         0, sizeof(struct g_consumer), "sizeof(struct g_consumer)");
  223 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_bioq, CTLFLAG_RD,
  224         0, sizeof(struct g_bioq), "sizeof(struct g_bioq)");

Cache object: f2d27ab86caecd1e484f3d9d346c97d3


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