241 lines
7.1 KiB
C
241 lines
7.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 2002 Poul-Henning Kamp
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* Copyright (c) 2002 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by Poul-Henning Kamp
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* and NAI Labs, the Security Research Division of Network Associates, Inc.
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* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
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* DARPA CHATS research program.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The names of the authors may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/eventhandler.h>
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#include <sys/malloc.h>
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#include <sys/bio.h>
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#include <sys/sysctl.h>
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#include <sys/proc.h>
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#include <sys/unistd.h>
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#include <sys/kthread.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/sbuf.h>
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#include <sys/sched.h>
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#include <sys/sx.h>
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#include <geom/geom.h>
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#include <geom/geom_int.h>
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MALLOC_DEFINE(M_GEOM, "GEOM", "Geom data structures");
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struct sx topology_lock;
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static struct proc *g_proc;
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static struct thread __read_mostly *g_up_td;
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static struct thread __read_mostly *g_down_td;
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static struct thread __read_mostly *g_event_td;
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int __read_mostly g_debugflags;
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int __read_mostly g_collectstats = G_STATS_PROVIDERS;
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int g_shutdown;
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int g_notaste;
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/*
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* G_UP and G_DOWN are the two threads which push I/O through the
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* stack.
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*
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* Things are procesed in a FIFO order, but these threads could be
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* part of I/O prioritization by deciding which bios/bioqs to service
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* in what order.
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*
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* We have only one thread in each direction, it is believed that until
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* a very non-trivial workload in the UP/DOWN path this will be enough,
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* but more than one can actually be run without problems.
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*
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* Holding the "mymutex" is a debugging feature: It prevents people
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* from sleeping in the UP/DOWN I/O path by mistake or design (doing
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* so almost invariably result in deadlocks since it stalls all I/O
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* processing in the given direction.
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*/
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static void
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g_up_procbody(void *arg)
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{
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thread_lock(g_up_td);
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sched_prio(g_up_td, PRIBIO);
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thread_unlock(g_up_td);
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for(;;) {
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g_io_schedule_up(g_up_td);
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}
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}
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static void
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g_down_procbody(void *arg)
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{
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thread_lock(g_down_td);
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sched_prio(g_down_td, PRIBIO);
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thread_unlock(g_down_td);
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for(;;) {
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g_io_schedule_down(g_down_td);
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}
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}
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static void
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g_event_procbody(void *arg)
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{
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thread_lock(g_event_td);
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sched_prio(g_event_td, PRIBIO);
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thread_unlock(g_event_td);
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g_run_events();
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/* NOTREACHED */
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}
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int
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g_is_geom_thread(struct thread *td)
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{
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return (td == g_up_td || td == g_down_td || td == g_event_td);
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}
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static void
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geom_shutdown(void *foo __unused)
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{
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g_shutdown = 1;
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}
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void
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g_init(void)
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{
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g_trace(G_T_TOPOLOGY, "g_ignition");
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sx_init(&topology_lock, "GEOM topology");
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g_io_init();
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g_event_init();
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g_ctl_init();
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kproc_kthread_add(g_event_procbody, NULL, &g_proc, &g_event_td,
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RFHIGHPID, 0, "geom", "g_event");
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kproc_kthread_add(g_up_procbody, NULL, &g_proc, &g_up_td,
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RFHIGHPID, 0, "geom", "g_up");
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kproc_kthread_add(g_down_procbody, NULL, &g_proc, &g_down_td,
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RFHIGHPID, 0, "geom", "g_down");
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EVENTHANDLER_REGISTER(shutdown_pre_sync, geom_shutdown, NULL,
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SHUTDOWN_PRI_FIRST);
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}
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static int
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sysctl_kern_geom_confany(struct sysctl_req *req, g_event_t *func, size_t *hint)
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{
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size_t len = 0;
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int error = 0;
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struct sbuf *sb;
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if (req->oldptr == NULL) {
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sb = sbuf_new(NULL, NULL, PAGE_SIZE, SBUF_FIXEDLEN |
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SBUF_INCLUDENUL);
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sbuf_set_drain(sb, sbuf_count_drain, &len);
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g_waitfor_event(func, sb, M_WAITOK, NULL);
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req->oldidx = *hint = len;
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} else {
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sb = sbuf_new(NULL, NULL, *hint, SBUF_AUTOEXTEND |
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SBUF_INCLUDENUL);
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g_waitfor_event(func, sb, M_WAITOK, NULL);
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*hint = sbuf_len(sb);
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error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb));
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}
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sbuf_delete(sb);
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return error;
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}
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static int
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sysctl_kern_geom_conftxt(SYSCTL_HANDLER_ARGS)
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{
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static size_t hint = PAGE_SIZE;
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return (sysctl_kern_geom_confany(req, g_conftxt, &hint));
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}
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static int
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sysctl_kern_geom_confdot(SYSCTL_HANDLER_ARGS)
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{
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static size_t hint = PAGE_SIZE;
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return (sysctl_kern_geom_confany(req, g_confdot, &hint));
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}
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static int
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sysctl_kern_geom_confxml(SYSCTL_HANDLER_ARGS)
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{
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static size_t hint = PAGE_SIZE;
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return (sysctl_kern_geom_confany(req, g_confxml, &hint));
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}
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SYSCTL_NODE(_kern, OID_AUTO, geom, CTLFLAG_RW, 0, "GEOMetry management");
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SYSCTL_PROC(_kern_geom, OID_AUTO, confxml, CTLTYPE_STRING|CTLFLAG_RD,
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0, 0, sysctl_kern_geom_confxml, "",
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"Dump the GEOM config in XML");
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SYSCTL_PROC(_kern_geom, OID_AUTO, confdot, CTLTYPE_STRING|CTLFLAG_RD,
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0, 0, sysctl_kern_geom_confdot, "",
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"Dump the GEOM config in dot");
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SYSCTL_PROC(_kern_geom, OID_AUTO, conftxt, CTLTYPE_STRING|CTLFLAG_RD,
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0, 0, sysctl_kern_geom_conftxt, "",
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"Dump the GEOM config in txt");
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SYSCTL_INT(_kern_geom, OID_AUTO, debugflags, CTLFLAG_RWTUN,
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&g_debugflags, 0, "Set various trace levels for GEOM debugging");
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SYSCTL_INT(_kern_geom, OID_AUTO, notaste, CTLFLAG_RW,
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&g_notaste, 0, "Prevent GEOM tasting");
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SYSCTL_INT(_kern_geom, OID_AUTO, collectstats, CTLFLAG_RW,
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&g_collectstats, 0,
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"Control statistics collection on GEOM providers and consumers");
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SYSCTL_INT(_debug_sizeof, OID_AUTO, g_class, CTLFLAG_RD,
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SYSCTL_NULL_INT_PTR, sizeof(struct g_class), "sizeof(struct g_class)");
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SYSCTL_INT(_debug_sizeof, OID_AUTO, g_geom, CTLFLAG_RD,
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SYSCTL_NULL_INT_PTR, sizeof(struct g_geom), "sizeof(struct g_geom)");
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SYSCTL_INT(_debug_sizeof, OID_AUTO, g_provider, CTLFLAG_RD,
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SYSCTL_NULL_INT_PTR, sizeof(struct g_provider), "sizeof(struct g_provider)");
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SYSCTL_INT(_debug_sizeof, OID_AUTO, g_consumer, CTLFLAG_RD,
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SYSCTL_NULL_INT_PTR, sizeof(struct g_consumer), "sizeof(struct g_consumer)");
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SYSCTL_INT(_debug_sizeof, OID_AUTO, g_bioq, CTLFLAG_RD,
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SYSCTL_NULL_INT_PTR, sizeof(struct g_bioq), "sizeof(struct g_bioq)");
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