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