b6fe583c55
It is quite specific mode of operation without storing on-disk metadata. It can be useful in some cases in combination with some external control tools handling mirror creation and disks hot-plug. MFC after: 2 weeks Sponsored by: iXsystems, Inc.
3417 lines
91 KiB
C
3417 lines
91 KiB
C
/*-
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* Copyright (c) 2004-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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* All rights reserved.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 AUTHORS 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/fail.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/limits.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/bio.h>
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#include <sys/sbuf.h>
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#include <sys/sysctl.h>
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#include <sys/malloc.h>
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#include <sys/eventhandler.h>
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#include <vm/uma.h>
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#include <geom/geom.h>
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#include <sys/proc.h>
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#include <sys/kthread.h>
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#include <sys/sched.h>
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#include <geom/mirror/g_mirror.h>
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FEATURE(geom_mirror, "GEOM mirroring support");
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static MALLOC_DEFINE(M_MIRROR, "mirror_data", "GEOM_MIRROR Data");
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SYSCTL_DECL(_kern_geom);
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static SYSCTL_NODE(_kern_geom, OID_AUTO, mirror, CTLFLAG_RW, 0,
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"GEOM_MIRROR stuff");
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u_int g_mirror_debug = 0;
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SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, debug, CTLFLAG_RWTUN, &g_mirror_debug, 0,
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"Debug level");
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static u_int g_mirror_timeout = 4;
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SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, timeout, CTLFLAG_RWTUN, &g_mirror_timeout,
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0, "Time to wait on all mirror components");
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static u_int g_mirror_idletime = 5;
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SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, idletime, CTLFLAG_RWTUN,
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&g_mirror_idletime, 0, "Mark components as clean when idling");
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static u_int g_mirror_disconnect_on_failure = 1;
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SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, disconnect_on_failure, CTLFLAG_RWTUN,
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&g_mirror_disconnect_on_failure, 0, "Disconnect component on I/O failure.");
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static u_int g_mirror_syncreqs = 2;
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SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, sync_requests, CTLFLAG_RDTUN,
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&g_mirror_syncreqs, 0, "Parallel synchronization I/O requests.");
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#define MSLEEP(ident, mtx, priority, wmesg, timeout) do { \
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G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, (ident)); \
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msleep((ident), (mtx), (priority), (wmesg), (timeout)); \
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G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, (ident)); \
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} while (0)
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static eventhandler_tag g_mirror_post_sync = NULL;
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static int g_mirror_shutdown = 0;
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static g_ctl_destroy_geom_t g_mirror_destroy_geom;
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static g_taste_t g_mirror_taste;
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static g_init_t g_mirror_init;
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static g_fini_t g_mirror_fini;
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static g_provgone_t g_mirror_providergone;
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static g_resize_t g_mirror_resize;
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struct g_class g_mirror_class = {
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.name = G_MIRROR_CLASS_NAME,
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.version = G_VERSION,
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.ctlreq = g_mirror_config,
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.taste = g_mirror_taste,
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.destroy_geom = g_mirror_destroy_geom,
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.init = g_mirror_init,
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.fini = g_mirror_fini,
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.providergone = g_mirror_providergone,
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.resize = g_mirror_resize
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};
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static void g_mirror_destroy_provider(struct g_mirror_softc *sc);
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static int g_mirror_update_disk(struct g_mirror_disk *disk, u_int state);
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static void g_mirror_update_device(struct g_mirror_softc *sc, bool force);
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static void g_mirror_dumpconf(struct sbuf *sb, const char *indent,
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struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp);
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static void g_mirror_sync_stop(struct g_mirror_disk *disk, int type);
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static void g_mirror_register_request(struct bio *bp);
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static void g_mirror_sync_release(struct g_mirror_softc *sc);
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static const char *
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g_mirror_disk_state2str(int state)
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{
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switch (state) {
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case G_MIRROR_DISK_STATE_NONE:
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return ("NONE");
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case G_MIRROR_DISK_STATE_NEW:
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return ("NEW");
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case G_MIRROR_DISK_STATE_ACTIVE:
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return ("ACTIVE");
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case G_MIRROR_DISK_STATE_STALE:
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return ("STALE");
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case G_MIRROR_DISK_STATE_SYNCHRONIZING:
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return ("SYNCHRONIZING");
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case G_MIRROR_DISK_STATE_DISCONNECTED:
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return ("DISCONNECTED");
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case G_MIRROR_DISK_STATE_DESTROY:
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return ("DESTROY");
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default:
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return ("INVALID");
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}
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}
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static const char *
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g_mirror_device_state2str(int state)
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{
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switch (state) {
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case G_MIRROR_DEVICE_STATE_STARTING:
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return ("STARTING");
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case G_MIRROR_DEVICE_STATE_RUNNING:
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return ("RUNNING");
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default:
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return ("INVALID");
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}
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}
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static const char *
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g_mirror_get_diskname(struct g_mirror_disk *disk)
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{
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if (disk->d_consumer == NULL || disk->d_consumer->provider == NULL)
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return ("[unknown]");
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return (disk->d_name);
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}
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/*
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* --- Events handling functions ---
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* Events in geom_mirror are used to maintain disks and device status
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* from one thread to simplify locking.
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*/
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static void
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g_mirror_event_free(struct g_mirror_event *ep)
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{
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free(ep, M_MIRROR);
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}
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int
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g_mirror_event_send(void *arg, int state, int flags)
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{
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struct g_mirror_softc *sc;
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struct g_mirror_disk *disk;
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struct g_mirror_event *ep;
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int error;
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ep = malloc(sizeof(*ep), M_MIRROR, M_WAITOK);
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G_MIRROR_DEBUG(4, "%s: Sending event %p.", __func__, ep);
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if ((flags & G_MIRROR_EVENT_DEVICE) != 0) {
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disk = NULL;
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sc = arg;
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} else {
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disk = arg;
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sc = disk->d_softc;
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}
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ep->e_disk = disk;
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ep->e_state = state;
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ep->e_flags = flags;
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ep->e_error = 0;
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mtx_lock(&sc->sc_events_mtx);
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TAILQ_INSERT_TAIL(&sc->sc_events, ep, e_next);
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mtx_unlock(&sc->sc_events_mtx);
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G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc);
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mtx_lock(&sc->sc_queue_mtx);
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wakeup(sc);
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mtx_unlock(&sc->sc_queue_mtx);
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if ((flags & G_MIRROR_EVENT_DONTWAIT) != 0)
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return (0);
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sx_assert(&sc->sc_lock, SX_XLOCKED);
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G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, ep);
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sx_xunlock(&sc->sc_lock);
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while ((ep->e_flags & G_MIRROR_EVENT_DONE) == 0) {
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mtx_lock(&sc->sc_events_mtx);
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MSLEEP(ep, &sc->sc_events_mtx, PRIBIO | PDROP, "m:event",
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hz * 5);
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}
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error = ep->e_error;
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g_mirror_event_free(ep);
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sx_xlock(&sc->sc_lock);
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return (error);
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}
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static struct g_mirror_event *
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g_mirror_event_get(struct g_mirror_softc *sc)
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{
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struct g_mirror_event *ep;
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mtx_lock(&sc->sc_events_mtx);
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ep = TAILQ_FIRST(&sc->sc_events);
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mtx_unlock(&sc->sc_events_mtx);
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return (ep);
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}
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static void
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g_mirror_event_remove(struct g_mirror_softc *sc, struct g_mirror_event *ep)
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{
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mtx_lock(&sc->sc_events_mtx);
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TAILQ_REMOVE(&sc->sc_events, ep, e_next);
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mtx_unlock(&sc->sc_events_mtx);
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}
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static void
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g_mirror_event_cancel(struct g_mirror_disk *disk)
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{
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struct g_mirror_softc *sc;
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struct g_mirror_event *ep, *tmpep;
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sc = disk->d_softc;
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sx_assert(&sc->sc_lock, SX_XLOCKED);
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mtx_lock(&sc->sc_events_mtx);
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TAILQ_FOREACH_SAFE(ep, &sc->sc_events, e_next, tmpep) {
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if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0)
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continue;
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if (ep->e_disk != disk)
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continue;
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TAILQ_REMOVE(&sc->sc_events, ep, e_next);
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if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0)
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g_mirror_event_free(ep);
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else {
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ep->e_error = ECANCELED;
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wakeup(ep);
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}
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}
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mtx_unlock(&sc->sc_events_mtx);
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}
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/*
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* Return the number of disks in given state.
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* If state is equal to -1, count all connected disks.
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*/
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u_int
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g_mirror_ndisks(struct g_mirror_softc *sc, int state)
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{
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struct g_mirror_disk *disk;
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u_int n = 0;
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sx_assert(&sc->sc_lock, SX_LOCKED);
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LIST_FOREACH(disk, &sc->sc_disks, d_next) {
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if (state == -1 || disk->d_state == state)
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n++;
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}
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return (n);
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}
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/*
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* Find a disk in mirror by its disk ID.
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*/
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static struct g_mirror_disk *
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g_mirror_id2disk(struct g_mirror_softc *sc, uint32_t id)
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{
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struct g_mirror_disk *disk;
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sx_assert(&sc->sc_lock, SX_XLOCKED);
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LIST_FOREACH(disk, &sc->sc_disks, d_next) {
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if (disk->d_id == id)
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return (disk);
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}
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return (NULL);
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}
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static u_int
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g_mirror_nrequests(struct g_mirror_softc *sc, struct g_consumer *cp)
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{
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struct bio *bp;
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u_int nreqs = 0;
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mtx_lock(&sc->sc_queue_mtx);
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TAILQ_FOREACH(bp, &sc->sc_queue.queue, bio_queue) {
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if (bp->bio_from == cp)
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nreqs++;
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}
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mtx_unlock(&sc->sc_queue_mtx);
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return (nreqs);
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}
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static int
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g_mirror_is_busy(struct g_mirror_softc *sc, struct g_consumer *cp)
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{
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if (cp->index > 0) {
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G_MIRROR_DEBUG(2,
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"I/O requests for %s exist, can't destroy it now.",
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cp->provider->name);
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return (1);
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}
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if (g_mirror_nrequests(sc, cp) > 0) {
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G_MIRROR_DEBUG(2,
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"I/O requests for %s in queue, can't destroy it now.",
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cp->provider->name);
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return (1);
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}
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return (0);
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}
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static void
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g_mirror_destroy_consumer(void *arg, int flags __unused)
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{
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struct g_consumer *cp;
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g_topology_assert();
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cp = arg;
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G_MIRROR_DEBUG(1, "Consumer %s destroyed.", cp->provider->name);
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g_detach(cp);
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g_destroy_consumer(cp);
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}
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static void
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g_mirror_kill_consumer(struct g_mirror_softc *sc, struct g_consumer *cp)
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{
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struct g_provider *pp;
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int retaste_wait;
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g_topology_assert();
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cp->private = NULL;
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if (g_mirror_is_busy(sc, cp))
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return;
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pp = cp->provider;
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retaste_wait = 0;
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if (cp->acw == 1) {
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if ((pp->geom->flags & G_GEOM_WITHER) == 0)
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retaste_wait = 1;
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}
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G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", pp->name, -cp->acr,
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-cp->acw, -cp->ace, 0);
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if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
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g_access(cp, -cp->acr, -cp->acw, -cp->ace);
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if (retaste_wait) {
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/*
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* After retaste event was send (inside g_access()), we can send
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* event to detach and destroy consumer.
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* A class, which has consumer to the given provider connected
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* will not receive retaste event for the provider.
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* This is the way how I ignore retaste events when I close
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* consumers opened for write: I detach and destroy consumer
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* after retaste event is sent.
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*/
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g_post_event(g_mirror_destroy_consumer, cp, M_WAITOK, NULL);
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return;
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}
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G_MIRROR_DEBUG(1, "Consumer %s destroyed.", pp->name);
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g_detach(cp);
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g_destroy_consumer(cp);
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}
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static int
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g_mirror_connect_disk(struct g_mirror_disk *disk, struct g_provider *pp)
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{
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struct g_consumer *cp;
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int error;
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g_topology_assert_not();
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KASSERT(disk->d_consumer == NULL,
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("Disk already connected (device %s).", disk->d_softc->sc_name));
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g_topology_lock();
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cp = g_new_consumer(disk->d_softc->sc_geom);
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cp->flags |= G_CF_DIRECT_RECEIVE;
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error = g_attach(cp, pp);
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if (error != 0) {
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g_destroy_consumer(cp);
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g_topology_unlock();
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return (error);
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}
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error = g_access(cp, 1, 1, 1);
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if (error != 0) {
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g_detach(cp);
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g_destroy_consumer(cp);
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g_topology_unlock();
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G_MIRROR_DEBUG(0, "Cannot open consumer %s (error=%d).",
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pp->name, error);
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return (error);
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}
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g_topology_unlock();
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disk->d_consumer = cp;
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disk->d_consumer->private = disk;
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disk->d_consumer->index = 0;
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|
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G_MIRROR_DEBUG(2, "Disk %s connected.", g_mirror_get_diskname(disk));
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return (0);
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}
|
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|
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static void
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g_mirror_disconnect_consumer(struct g_mirror_softc *sc, struct g_consumer *cp)
|
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{
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|
|
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g_topology_assert();
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|
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if (cp == NULL)
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return;
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if (cp->provider != NULL)
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g_mirror_kill_consumer(sc, cp);
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else
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g_destroy_consumer(cp);
|
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}
|
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|
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/*
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* Initialize disk. This means allocate memory, create consumer, attach it
|
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* to the provider and open access (r1w1e1) to it.
|
|
*/
|
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static struct g_mirror_disk *
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g_mirror_init_disk(struct g_mirror_softc *sc, struct g_provider *pp,
|
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struct g_mirror_metadata *md, int *errorp)
|
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{
|
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struct g_mirror_disk *disk;
|
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int i, error;
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|
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disk = malloc(sizeof(*disk), M_MIRROR, M_NOWAIT | M_ZERO);
|
|
if (disk == NULL) {
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error = ENOMEM;
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goto fail;
|
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}
|
|
disk->d_softc = sc;
|
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error = g_mirror_connect_disk(disk, pp);
|
|
if (error != 0)
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goto fail;
|
|
disk->d_id = md->md_did;
|
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disk->d_state = G_MIRROR_DISK_STATE_NONE;
|
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disk->d_priority = md->md_priority;
|
|
disk->d_flags = md->md_dflags;
|
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error = g_getattr("GEOM::candelete", disk->d_consumer, &i);
|
|
if (error == 0 && i != 0)
|
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disk->d_flags |= G_MIRROR_DISK_FLAG_CANDELETE;
|
|
if (md->md_provider[0] != '\0')
|
|
disk->d_flags |= G_MIRROR_DISK_FLAG_HARDCODED;
|
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disk->d_sync.ds_consumer = NULL;
|
|
disk->d_sync.ds_offset = md->md_sync_offset;
|
|
disk->d_sync.ds_offset_done = md->md_sync_offset;
|
|
disk->d_genid = md->md_genid;
|
|
disk->d_sync.ds_syncid = md->md_syncid;
|
|
if (errorp != NULL)
|
|
*errorp = 0;
|
|
return (disk);
|
|
fail:
|
|
if (errorp != NULL)
|
|
*errorp = error;
|
|
if (disk != NULL)
|
|
free(disk, M_MIRROR);
|
|
return (NULL);
|
|
}
|
|
|
|
static void
|
|
g_mirror_destroy_disk(struct g_mirror_disk *disk)
|
|
{
|
|
struct g_mirror_softc *sc;
|
|
|
|
g_topology_assert_not();
|
|
sc = disk->d_softc;
|
|
sx_assert(&sc->sc_lock, SX_XLOCKED);
|
|
|
|
LIST_REMOVE(disk, d_next);
|
|
g_mirror_event_cancel(disk);
|
|
if (sc->sc_hint == disk)
|
|
sc->sc_hint = NULL;
|
|
switch (disk->d_state) {
|
|
case G_MIRROR_DISK_STATE_SYNCHRONIZING:
|
|
g_mirror_sync_stop(disk, 1);
|
|
/* FALLTHROUGH */
|
|
case G_MIRROR_DISK_STATE_NEW:
|
|
case G_MIRROR_DISK_STATE_STALE:
|
|
case G_MIRROR_DISK_STATE_ACTIVE:
|
|
g_topology_lock();
|
|
g_mirror_disconnect_consumer(sc, disk->d_consumer);
|
|
g_topology_unlock();
|
|
free(disk, M_MIRROR);
|
|
break;
|
|
default:
|
|
KASSERT(0 == 1, ("Wrong disk state (%s, %s).",
|
|
g_mirror_get_diskname(disk),
|
|
g_mirror_disk_state2str(disk->d_state)));
|
|
}
|
|
}
|
|
|
|
static void
|
|
g_mirror_free_device(struct g_mirror_softc *sc)
|
|
{
|
|
|
|
mtx_destroy(&sc->sc_queue_mtx);
|
|
mtx_destroy(&sc->sc_events_mtx);
|
|
mtx_destroy(&sc->sc_done_mtx);
|
|
sx_destroy(&sc->sc_lock);
|
|
free(sc, M_MIRROR);
|
|
}
|
|
|
|
static void
|
|
g_mirror_providergone(struct g_provider *pp)
|
|
{
|
|
struct g_mirror_softc *sc = pp->private;
|
|
|
|
if ((--sc->sc_refcnt) == 0)
|
|
g_mirror_free_device(sc);
|
|
}
|
|
|
|
static void
|
|
g_mirror_destroy_device(struct g_mirror_softc *sc)
|
|
{
|
|
struct g_mirror_disk *disk;
|
|
struct g_mirror_event *ep;
|
|
struct g_geom *gp;
|
|
struct g_consumer *cp, *tmpcp;
|
|
|
|
g_topology_assert_not();
|
|
sx_assert(&sc->sc_lock, SX_XLOCKED);
|
|
|
|
gp = sc->sc_geom;
|
|
if (sc->sc_provider != NULL)
|
|
g_mirror_destroy_provider(sc);
|
|
for (disk = LIST_FIRST(&sc->sc_disks); disk != NULL;
|
|
disk = LIST_FIRST(&sc->sc_disks)) {
|
|
disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
|
|
g_mirror_update_metadata(disk);
|
|
g_mirror_destroy_disk(disk);
|
|
}
|
|
while ((ep = g_mirror_event_get(sc)) != NULL) {
|
|
g_mirror_event_remove(sc, ep);
|
|
if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0)
|
|
g_mirror_event_free(ep);
|
|
else {
|
|
ep->e_error = ECANCELED;
|
|
ep->e_flags |= G_MIRROR_EVENT_DONE;
|
|
G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, ep);
|
|
mtx_lock(&sc->sc_events_mtx);
|
|
wakeup(ep);
|
|
mtx_unlock(&sc->sc_events_mtx);
|
|
}
|
|
}
|
|
callout_drain(&sc->sc_callout);
|
|
|
|
g_topology_lock();
|
|
LIST_FOREACH_SAFE(cp, &sc->sc_sync.ds_geom->consumer, consumer, tmpcp) {
|
|
g_mirror_disconnect_consumer(sc, cp);
|
|
}
|
|
g_wither_geom(sc->sc_sync.ds_geom, ENXIO);
|
|
G_MIRROR_DEBUG(0, "Device %s destroyed.", gp->name);
|
|
g_wither_geom(gp, ENXIO);
|
|
sx_xunlock(&sc->sc_lock);
|
|
if ((--sc->sc_refcnt) == 0)
|
|
g_mirror_free_device(sc);
|
|
g_topology_unlock();
|
|
}
|
|
|
|
static void
|
|
g_mirror_orphan(struct g_consumer *cp)
|
|
{
|
|
struct g_mirror_disk *disk;
|
|
|
|
g_topology_assert();
|
|
|
|
disk = cp->private;
|
|
if (disk == NULL)
|
|
return;
|
|
disk->d_softc->sc_bump_id |= G_MIRROR_BUMP_SYNCID;
|
|
g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED,
|
|
G_MIRROR_EVENT_DONTWAIT);
|
|
}
|
|
|
|
/*
|
|
* Function should return the next active disk on the list.
|
|
* It is possible that it will be the same disk as given.
|
|
* If there are no active disks on list, NULL is returned.
|
|
*/
|
|
static __inline struct g_mirror_disk *
|
|
g_mirror_find_next(struct g_mirror_softc *sc, struct g_mirror_disk *disk)
|
|
{
|
|
struct g_mirror_disk *dp;
|
|
|
|
for (dp = LIST_NEXT(disk, d_next); dp != disk;
|
|
dp = LIST_NEXT(dp, d_next)) {
|
|
if (dp == NULL)
|
|
dp = LIST_FIRST(&sc->sc_disks);
|
|
if (dp->d_state == G_MIRROR_DISK_STATE_ACTIVE)
|
|
break;
|
|
}
|
|
if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE)
|
|
return (NULL);
|
|
return (dp);
|
|
}
|
|
|
|
static struct g_mirror_disk *
|
|
g_mirror_get_disk(struct g_mirror_softc *sc)
|
|
{
|
|
struct g_mirror_disk *disk;
|
|
|
|
if (sc->sc_hint == NULL) {
|
|
sc->sc_hint = LIST_FIRST(&sc->sc_disks);
|
|
if (sc->sc_hint == NULL)
|
|
return (NULL);
|
|
}
|
|
disk = sc->sc_hint;
|
|
if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) {
|
|
disk = g_mirror_find_next(sc, disk);
|
|
if (disk == NULL)
|
|
return (NULL);
|
|
}
|
|
sc->sc_hint = g_mirror_find_next(sc, disk);
|
|
return (disk);
|
|
}
|
|
|
|
static int
|
|
g_mirror_write_metadata(struct g_mirror_disk *disk,
|
|
struct g_mirror_metadata *md)
|
|
{
|
|
struct g_mirror_softc *sc;
|
|
struct g_consumer *cp;
|
|
off_t offset, length;
|
|
u_char *sector;
|
|
int error = 0;
|
|
|
|
g_topology_assert_not();
|
|
sc = disk->d_softc;
|
|
sx_assert(&sc->sc_lock, SX_LOCKED);
|
|
|
|
cp = disk->d_consumer;
|
|
KASSERT(cp != NULL, ("NULL consumer (%s).", sc->sc_name));
|
|
KASSERT(cp->provider != NULL, ("NULL provider (%s).", sc->sc_name));
|
|
KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
|
|
("Consumer %s closed? (r%dw%de%d).", cp->provider->name, cp->acr,
|
|
cp->acw, cp->ace));
|
|
length = cp->provider->sectorsize;
|
|
offset = cp->provider->mediasize - length;
|
|
sector = malloc((size_t)length, M_MIRROR, M_WAITOK | M_ZERO);
|
|
if (md != NULL &&
|
|
(sc->sc_flags & G_MIRROR_DEVICE_FLAG_WIPE) == 0) {
|
|
/*
|
|
* Handle the case, when the size of parent provider reduced.
|
|
*/
|
|
if (offset < md->md_mediasize)
|
|
error = ENOSPC;
|
|
else
|
|
mirror_metadata_encode(md, sector);
|
|
}
|
|
KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_metadata_write, error);
|
|
if (error == 0)
|
|
error = g_write_data(cp, offset, sector, length);
|
|
free(sector, M_MIRROR);
|
|
if (error != 0) {
|
|
if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) {
|
|
disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN;
|
|
G_MIRROR_DEBUG(0, "Cannot write metadata on %s "
|
|
"(device=%s, error=%d).",
|
|
g_mirror_get_diskname(disk), sc->sc_name, error);
|
|
} else {
|
|
G_MIRROR_DEBUG(1, "Cannot write metadata on %s "
|
|
"(device=%s, error=%d).",
|
|
g_mirror_get_diskname(disk), sc->sc_name, error);
|
|
}
|
|
if (g_mirror_disconnect_on_failure &&
|
|
g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) {
|
|
sc->sc_bump_id |= G_MIRROR_BUMP_GENID;
|
|
g_mirror_event_send(disk,
|
|
G_MIRROR_DISK_STATE_DISCONNECTED,
|
|
G_MIRROR_EVENT_DONTWAIT);
|
|
}
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
g_mirror_clear_metadata(struct g_mirror_disk *disk)
|
|
{
|
|
int error;
|
|
|
|
g_topology_assert_not();
|
|
sx_assert(&disk->d_softc->sc_lock, SX_LOCKED);
|
|
|
|
if (disk->d_softc->sc_type != G_MIRROR_TYPE_AUTOMATIC)
|
|
return (0);
|
|
error = g_mirror_write_metadata(disk, NULL);
|
|
if (error == 0) {
|
|
G_MIRROR_DEBUG(2, "Metadata on %s cleared.",
|
|
g_mirror_get_diskname(disk));
|
|
} else {
|
|
G_MIRROR_DEBUG(0,
|
|
"Cannot clear metadata on disk %s (error=%d).",
|
|
g_mirror_get_diskname(disk), error);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
void
|
|
g_mirror_fill_metadata(struct g_mirror_softc *sc, struct g_mirror_disk *disk,
|
|
struct g_mirror_metadata *md)
|
|
{
|
|
|
|
strlcpy(md->md_magic, G_MIRROR_MAGIC, sizeof(md->md_magic));
|
|
md->md_version = G_MIRROR_VERSION;
|
|
strlcpy(md->md_name, sc->sc_name, sizeof(md->md_name));
|
|
md->md_mid = sc->sc_id;
|
|
md->md_all = sc->sc_ndisks;
|
|
md->md_slice = sc->sc_slice;
|
|
md->md_balance = sc->sc_balance;
|
|
md->md_genid = sc->sc_genid;
|
|
md->md_mediasize = sc->sc_mediasize;
|
|
md->md_sectorsize = sc->sc_sectorsize;
|
|
md->md_mflags = (sc->sc_flags & G_MIRROR_DEVICE_FLAG_MASK);
|
|
bzero(md->md_provider, sizeof(md->md_provider));
|
|
if (disk == NULL) {
|
|
md->md_did = arc4random();
|
|
md->md_priority = 0;
|
|
md->md_syncid = 0;
|
|
md->md_dflags = 0;
|
|
md->md_sync_offset = 0;
|
|
md->md_provsize = 0;
|
|
} else {
|
|
md->md_did = disk->d_id;
|
|
md->md_priority = disk->d_priority;
|
|
md->md_syncid = disk->d_sync.ds_syncid;
|
|
md->md_dflags = (disk->d_flags & G_MIRROR_DISK_FLAG_MASK);
|
|
if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING)
|
|
md->md_sync_offset = disk->d_sync.ds_offset_done;
|
|
else
|
|
md->md_sync_offset = 0;
|
|
if ((disk->d_flags & G_MIRROR_DISK_FLAG_HARDCODED) != 0) {
|
|
strlcpy(md->md_provider,
|
|
disk->d_consumer->provider->name,
|
|
sizeof(md->md_provider));
|
|
}
|
|
md->md_provsize = disk->d_consumer->provider->mediasize;
|
|
}
|
|
}
|
|
|
|
void
|
|
g_mirror_update_metadata(struct g_mirror_disk *disk)
|
|
{
|
|
struct g_mirror_softc *sc;
|
|
struct g_mirror_metadata md;
|
|
int error;
|
|
|
|
g_topology_assert_not();
|
|
sc = disk->d_softc;
|
|
sx_assert(&sc->sc_lock, SX_LOCKED);
|
|
|
|
if (sc->sc_type != G_MIRROR_TYPE_AUTOMATIC)
|
|
return;
|
|
if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_WIPE) == 0)
|
|
g_mirror_fill_metadata(sc, disk, &md);
|
|
error = g_mirror_write_metadata(disk, &md);
|
|
if (error == 0) {
|
|
G_MIRROR_DEBUG(2, "Metadata on %s updated.",
|
|
g_mirror_get_diskname(disk));
|
|
} else {
|
|
G_MIRROR_DEBUG(0,
|
|
"Cannot update metadata on disk %s (error=%d).",
|
|
g_mirror_get_diskname(disk), error);
|
|
}
|
|
}
|
|
|
|
static void
|
|
g_mirror_bump_syncid(struct g_mirror_softc *sc)
|
|
{
|
|
struct g_mirror_disk *disk;
|
|
|
|
g_topology_assert_not();
|
|
sx_assert(&sc->sc_lock, SX_XLOCKED);
|
|
KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0,
|
|
("%s called with no active disks (device=%s).", __func__,
|
|
sc->sc_name));
|
|
|
|
sc->sc_syncid++;
|
|
G_MIRROR_DEBUG(1, "Device %s: syncid bumped to %u.", sc->sc_name,
|
|
sc->sc_syncid);
|
|
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
|
|
if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE ||
|
|
disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) {
|
|
disk->d_sync.ds_syncid = sc->sc_syncid;
|
|
g_mirror_update_metadata(disk);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
g_mirror_bump_genid(struct g_mirror_softc *sc)
|
|
{
|
|
struct g_mirror_disk *disk;
|
|
|
|
g_topology_assert_not();
|
|
sx_assert(&sc->sc_lock, SX_XLOCKED);
|
|
KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0,
|
|
("%s called with no active disks (device=%s).", __func__,
|
|
sc->sc_name));
|
|
|
|
sc->sc_genid++;
|
|
G_MIRROR_DEBUG(1, "Device %s: genid bumped to %u.", sc->sc_name,
|
|
sc->sc_genid);
|
|
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
|
|
if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE ||
|
|
disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) {
|
|
disk->d_genid = sc->sc_genid;
|
|
g_mirror_update_metadata(disk);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int
|
|
g_mirror_idle(struct g_mirror_softc *sc, int acw)
|
|
{
|
|
struct g_mirror_disk *disk;
|
|
int timeout;
|
|
|
|
g_topology_assert_not();
|
|
sx_assert(&sc->sc_lock, SX_XLOCKED);
|
|
|
|
if (sc->sc_provider == NULL)
|
|
return (0);
|
|
if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0)
|
|
return (0);
|
|
if (sc->sc_idle)
|
|
return (0);
|
|
if (sc->sc_writes > 0)
|
|
return (0);
|
|
if (acw > 0 || (acw == -1 && sc->sc_provider->acw > 0)) {
|
|
timeout = g_mirror_idletime - (time_uptime - sc->sc_last_write);
|
|
if (!g_mirror_shutdown && timeout > 0)
|
|
return (timeout);
|
|
}
|
|
sc->sc_idle = 1;
|
|
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
|
|
if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE)
|
|
continue;
|
|
G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as clean.",
|
|
g_mirror_get_diskname(disk), sc->sc_name);
|
|
disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
|
|
g_mirror_update_metadata(disk);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
g_mirror_unidle(struct g_mirror_softc *sc)
|
|
{
|
|
struct g_mirror_disk *disk;
|
|
|
|
g_topology_assert_not();
|
|
sx_assert(&sc->sc_lock, SX_XLOCKED);
|
|
|
|
if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0)
|
|
return;
|
|
sc->sc_idle = 0;
|
|
sc->sc_last_write = time_uptime;
|
|
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
|
|
if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE)
|
|
continue;
|
|
G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as dirty.",
|
|
g_mirror_get_diskname(disk), sc->sc_name);
|
|
disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY;
|
|
g_mirror_update_metadata(disk);
|
|
}
|
|
}
|
|
|
|
static void
|
|
g_mirror_flush_done(struct bio *bp)
|
|
{
|
|
struct g_mirror_softc *sc;
|
|
struct bio *pbp;
|
|
|
|
pbp = bp->bio_parent;
|
|
sc = pbp->bio_to->private;
|
|
mtx_lock(&sc->sc_done_mtx);
|
|
if (pbp->bio_error == 0)
|
|
pbp->bio_error = bp->bio_error;
|
|
pbp->bio_completed += bp->bio_completed;
|
|
pbp->bio_inbed++;
|
|
if (pbp->bio_children == pbp->bio_inbed) {
|
|
mtx_unlock(&sc->sc_done_mtx);
|
|
g_io_deliver(pbp, pbp->bio_error);
|
|
} else
|
|
mtx_unlock(&sc->sc_done_mtx);
|
|
g_destroy_bio(bp);
|
|
}
|
|
|
|
static void
|
|
g_mirror_done(struct bio *bp)
|
|
{
|
|
struct g_mirror_softc *sc;
|
|
|
|
sc = bp->bio_from->geom->softc;
|
|
bp->bio_cflags = G_MIRROR_BIO_FLAG_REGULAR;
|
|
mtx_lock(&sc->sc_queue_mtx);
|
|
bioq_insert_tail(&sc->sc_queue, bp);
|
|
mtx_unlock(&sc->sc_queue_mtx);
|
|
wakeup(sc);
|
|
}
|
|
|
|
static void
|
|
g_mirror_regular_request(struct bio *bp)
|
|
{
|
|
struct g_mirror_softc *sc;
|
|
struct g_mirror_disk *disk;
|
|
struct bio *pbp;
|
|
|
|
g_topology_assert_not();
|
|
|
|
pbp = bp->bio_parent;
|
|
sc = pbp->bio_to->private;
|
|
bp->bio_from->index--;
|
|
if (bp->bio_cmd == BIO_WRITE)
|
|
sc->sc_writes--;
|
|
disk = bp->bio_from->private;
|
|
if (disk == NULL) {
|
|
g_topology_lock();
|
|
g_mirror_kill_consumer(sc, bp->bio_from);
|
|
g_topology_unlock();
|
|
}
|
|
|
|
if (bp->bio_cmd == BIO_READ)
|
|
KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_read,
|
|
bp->bio_error);
|
|
else if (bp->bio_cmd == BIO_WRITE)
|
|
KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_write,
|
|
bp->bio_error);
|
|
|
|
pbp->bio_inbed++;
|
|
KASSERT(pbp->bio_inbed <= pbp->bio_children,
|
|
("bio_inbed (%u) is bigger than bio_children (%u).", pbp->bio_inbed,
|
|
pbp->bio_children));
|
|
if (bp->bio_error == 0 && pbp->bio_error == 0) {
|
|
G_MIRROR_LOGREQ(3, bp, "Request delivered.");
|
|
g_destroy_bio(bp);
|
|
if (pbp->bio_children == pbp->bio_inbed) {
|
|
G_MIRROR_LOGREQ(3, pbp, "Request delivered.");
|
|
pbp->bio_completed = pbp->bio_length;
|
|
if (pbp->bio_cmd == BIO_WRITE ||
|
|
pbp->bio_cmd == BIO_DELETE) {
|
|
bioq_remove(&sc->sc_inflight, pbp);
|
|
/* Release delayed sync requests if possible. */
|
|
g_mirror_sync_release(sc);
|
|
}
|
|
g_io_deliver(pbp, pbp->bio_error);
|
|
}
|
|
return;
|
|
} else if (bp->bio_error != 0) {
|
|
if (pbp->bio_error == 0)
|
|
pbp->bio_error = bp->bio_error;
|
|
if (disk != NULL) {
|
|
if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) {
|
|
disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN;
|
|
G_MIRROR_LOGREQ(0, bp,
|
|
"Request failed (error=%d).",
|
|
bp->bio_error);
|
|
} else {
|
|
G_MIRROR_LOGREQ(1, bp,
|
|
"Request failed (error=%d).",
|
|
bp->bio_error);
|
|
}
|
|
if (g_mirror_disconnect_on_failure &&
|
|
g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1)
|
|
{
|
|
sc->sc_bump_id |= G_MIRROR_BUMP_GENID;
|
|
g_mirror_event_send(disk,
|
|
G_MIRROR_DISK_STATE_DISCONNECTED,
|
|
G_MIRROR_EVENT_DONTWAIT);
|
|
}
|
|
}
|
|
switch (pbp->bio_cmd) {
|
|
case BIO_DELETE:
|
|
case BIO_WRITE:
|
|
pbp->bio_inbed--;
|
|
pbp->bio_children--;
|
|
break;
|
|
}
|
|
}
|
|
g_destroy_bio(bp);
|
|
|
|
switch (pbp->bio_cmd) {
|
|
case BIO_READ:
|
|
if (pbp->bio_inbed < pbp->bio_children)
|
|
break;
|
|
if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 1)
|
|
g_io_deliver(pbp, pbp->bio_error);
|
|
else {
|
|
pbp->bio_error = 0;
|
|
mtx_lock(&sc->sc_queue_mtx);
|
|
bioq_insert_tail(&sc->sc_queue, pbp);
|
|
mtx_unlock(&sc->sc_queue_mtx);
|
|
G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc);
|
|
wakeup(sc);
|
|
}
|
|
break;
|
|
case BIO_DELETE:
|
|
case BIO_WRITE:
|
|
if (pbp->bio_children == 0) {
|
|
/*
|
|
* All requests failed.
|
|
*/
|
|
} else if (pbp->bio_inbed < pbp->bio_children) {
|
|
/* Do nothing. */
|
|
break;
|
|
} else if (pbp->bio_children == pbp->bio_inbed) {
|
|
/* Some requests succeeded. */
|
|
pbp->bio_error = 0;
|
|
pbp->bio_completed = pbp->bio_length;
|
|
}
|
|
bioq_remove(&sc->sc_inflight, pbp);
|
|
/* Release delayed sync requests if possible. */
|
|
g_mirror_sync_release(sc);
|
|
g_io_deliver(pbp, pbp->bio_error);
|
|
break;
|
|
default:
|
|
KASSERT(1 == 0, ("Invalid request: %u.", pbp->bio_cmd));
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
g_mirror_sync_done(struct bio *bp)
|
|
{
|
|
struct g_mirror_softc *sc;
|
|
|
|
G_MIRROR_LOGREQ(3, bp, "Synchronization request delivered.");
|
|
sc = bp->bio_from->geom->softc;
|
|
bp->bio_cflags = G_MIRROR_BIO_FLAG_SYNC;
|
|
mtx_lock(&sc->sc_queue_mtx);
|
|
bioq_insert_tail(&sc->sc_queue, bp);
|
|
mtx_unlock(&sc->sc_queue_mtx);
|
|
wakeup(sc);
|
|
}
|
|
|
|
static void
|
|
g_mirror_candelete(struct bio *bp)
|
|
{
|
|
struct g_mirror_softc *sc;
|
|
struct g_mirror_disk *disk;
|
|
int *val;
|
|
|
|
sc = bp->bio_to->private;
|
|
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
|
|
if (disk->d_flags & G_MIRROR_DISK_FLAG_CANDELETE)
|
|
break;
|
|
}
|
|
val = (int *)bp->bio_data;
|
|
*val = (disk != NULL);
|
|
g_io_deliver(bp, 0);
|
|
}
|
|
|
|
static void
|
|
g_mirror_kernel_dump(struct bio *bp)
|
|
{
|
|
struct g_mirror_softc *sc;
|
|
struct g_mirror_disk *disk;
|
|
struct bio *cbp;
|
|
struct g_kerneldump *gkd;
|
|
|
|
/*
|
|
* We configure dumping to the first component, because this component
|
|
* will be used for reading with 'prefer' balance algorithm.
|
|
* If the component with the highest priority is currently disconnected
|
|
* we will not be able to read the dump after the reboot if it will be
|
|
* connected and synchronized later. Can we do something better?
|
|
*/
|
|
sc = bp->bio_to->private;
|
|
disk = LIST_FIRST(&sc->sc_disks);
|
|
|
|
gkd = (struct g_kerneldump *)bp->bio_data;
|
|
if (gkd->length > bp->bio_to->mediasize)
|
|
gkd->length = bp->bio_to->mediasize;
|
|
cbp = g_clone_bio(bp);
|
|
if (cbp == NULL) {
|
|
g_io_deliver(bp, ENOMEM);
|
|
return;
|
|
}
|
|
cbp->bio_done = g_std_done;
|
|
g_io_request(cbp, disk->d_consumer);
|
|
G_MIRROR_DEBUG(1, "Kernel dump will go to %s.",
|
|
g_mirror_get_diskname(disk));
|
|
}
|
|
|
|
static void
|
|
g_mirror_flush(struct g_mirror_softc *sc, struct bio *bp)
|
|
{
|
|
struct bio_queue_head queue;
|
|
struct g_mirror_disk *disk;
|
|
struct g_consumer *cp;
|
|
struct bio *cbp;
|
|
|
|
bioq_init(&queue);
|
|
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
|
|
if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE)
|
|
continue;
|
|
cbp = g_clone_bio(bp);
|
|
if (cbp == NULL) {
|
|
while ((cbp = bioq_takefirst(&queue)) != NULL)
|
|
g_destroy_bio(cbp);
|
|
if (bp->bio_error == 0)
|
|
bp->bio_error = ENOMEM;
|
|
g_io_deliver(bp, bp->bio_error);
|
|
return;
|
|
}
|
|
bioq_insert_tail(&queue, cbp);
|
|
cbp->bio_done = g_mirror_flush_done;
|
|
cbp->bio_caller1 = disk;
|
|
cbp->bio_to = disk->d_consumer->provider;
|
|
}
|
|
while ((cbp = bioq_takefirst(&queue)) != NULL) {
|
|
G_MIRROR_LOGREQ(3, cbp, "Sending request.");
|
|
disk = cbp->bio_caller1;
|
|
cbp->bio_caller1 = NULL;
|
|
cp = disk->d_consumer;
|
|
KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
|
|
("Consumer %s not opened (r%dw%de%d).", cp->provider->name,
|
|
cp->acr, cp->acw, cp->ace));
|
|
g_io_request(cbp, disk->d_consumer);
|
|
}
|
|
}
|
|
|
|
static void
|
|
g_mirror_start(struct bio *bp)
|
|
{
|
|
struct g_mirror_softc *sc;
|
|
|
|
sc = bp->bio_to->private;
|
|
/*
|
|
* If sc == NULL or there are no valid disks, provider's error
|
|
* should be set and g_mirror_start() should not be called at all.
|
|
*/
|
|
KASSERT(sc != NULL && sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
|
|
("Provider's error should be set (error=%d)(mirror=%s).",
|
|
bp->bio_to->error, bp->bio_to->name));
|
|
G_MIRROR_LOGREQ(3, bp, "Request received.");
|
|
|
|
switch (bp->bio_cmd) {
|
|
case BIO_READ:
|
|
case BIO_WRITE:
|
|
case BIO_DELETE:
|
|
break;
|
|
case BIO_FLUSH:
|
|
g_mirror_flush(sc, bp);
|
|
return;
|
|
case BIO_GETATTR:
|
|
if (!strcmp(bp->bio_attribute, "GEOM::candelete")) {
|
|
g_mirror_candelete(bp);
|
|
return;
|
|
} else if (strcmp("GEOM::kerneldump", bp->bio_attribute) == 0) {
|
|
g_mirror_kernel_dump(bp);
|
|
return;
|
|
}
|
|
/* FALLTHROUGH */
|
|
default:
|
|
g_io_deliver(bp, EOPNOTSUPP);
|
|
return;
|
|
}
|
|
mtx_lock(&sc->sc_queue_mtx);
|
|
bioq_insert_tail(&sc->sc_queue, bp);
|
|
mtx_unlock(&sc->sc_queue_mtx);
|
|
G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc);
|
|
wakeup(sc);
|
|
}
|
|
|
|
/*
|
|
* Return TRUE if the given request is colliding with a in-progress
|
|
* synchronization request.
|
|
*/
|
|
static int
|
|
g_mirror_sync_collision(struct g_mirror_softc *sc, struct bio *bp)
|
|
{
|
|
struct g_mirror_disk *disk;
|
|
struct bio *sbp;
|
|
off_t rstart, rend, sstart, send;
|
|
u_int i;
|
|
|
|
if (sc->sc_sync.ds_ndisks == 0)
|
|
return (0);
|
|
rstart = bp->bio_offset;
|
|
rend = bp->bio_offset + bp->bio_length;
|
|
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
|
|
if (disk->d_state != G_MIRROR_DISK_STATE_SYNCHRONIZING)
|
|
continue;
|
|
for (i = 0; i < g_mirror_syncreqs; i++) {
|
|
sbp = disk->d_sync.ds_bios[i];
|
|
if (sbp == NULL)
|
|
continue;
|
|
sstart = sbp->bio_offset;
|
|
send = sbp->bio_offset + sbp->bio_length;
|
|
if (rend > sstart && rstart < send)
|
|
return (1);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Return TRUE if the given sync request is colliding with a in-progress regular
|
|
* request.
|
|
*/
|
|
static int
|
|
g_mirror_regular_collision(struct g_mirror_softc *sc, struct bio *sbp)
|
|
{
|
|
off_t rstart, rend, sstart, send;
|
|
struct bio *bp;
|
|
|
|
if (sc->sc_sync.ds_ndisks == 0)
|
|
return (0);
|
|
sstart = sbp->bio_offset;
|
|
send = sbp->bio_offset + sbp->bio_length;
|
|
TAILQ_FOREACH(bp, &sc->sc_inflight.queue, bio_queue) {
|
|
rstart = bp->bio_offset;
|
|
rend = bp->bio_offset + bp->bio_length;
|
|
if (rend > sstart && rstart < send)
|
|
return (1);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Puts request onto delayed queue.
|
|
*/
|
|
static void
|
|
g_mirror_regular_delay(struct g_mirror_softc *sc, struct bio *bp)
|
|
{
|
|
|
|
G_MIRROR_LOGREQ(2, bp, "Delaying request.");
|
|
bioq_insert_head(&sc->sc_regular_delayed, bp);
|
|
}
|
|
|
|
/*
|
|
* Puts synchronization request onto delayed queue.
|
|
*/
|
|
static void
|
|
g_mirror_sync_delay(struct g_mirror_softc *sc, struct bio *bp)
|
|
{
|
|
|
|
G_MIRROR_LOGREQ(2, bp, "Delaying synchronization request.");
|
|
bioq_insert_tail(&sc->sc_sync_delayed, bp);
|
|
}
|
|
|
|
/*
|
|
* Releases delayed regular requests which don't collide anymore with sync
|
|
* requests.
|
|
*/
|
|
static void
|
|
g_mirror_regular_release(struct g_mirror_softc *sc)
|
|
{
|
|
struct bio *bp, *bp2;
|
|
|
|
TAILQ_FOREACH_SAFE(bp, &sc->sc_regular_delayed.queue, bio_queue, bp2) {
|
|
if (g_mirror_sync_collision(sc, bp))
|
|
continue;
|
|
bioq_remove(&sc->sc_regular_delayed, bp);
|
|
G_MIRROR_LOGREQ(2, bp, "Releasing delayed request (%p).", bp);
|
|
mtx_lock(&sc->sc_queue_mtx);
|
|
bioq_insert_head(&sc->sc_queue, bp);
|
|
mtx_unlock(&sc->sc_queue_mtx);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Releases delayed sync requests which don't collide anymore with regular
|
|
* requests.
|
|
*/
|
|
static void
|
|
g_mirror_sync_release(struct g_mirror_softc *sc)
|
|
{
|
|
struct bio *bp, *bp2;
|
|
|
|
TAILQ_FOREACH_SAFE(bp, &sc->sc_sync_delayed.queue, bio_queue, bp2) {
|
|
if (g_mirror_regular_collision(sc, bp))
|
|
continue;
|
|
bioq_remove(&sc->sc_sync_delayed, bp);
|
|
G_MIRROR_LOGREQ(2, bp,
|
|
"Releasing delayed synchronization request.");
|
|
g_io_request(bp, bp->bio_from);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Free a synchronization request and clear its slot in the array.
|
|
*/
|
|
static void
|
|
g_mirror_sync_request_free(struct g_mirror_disk *disk, struct bio *bp)
|
|
{
|
|
int i;
|
|
|
|
if (disk != NULL && disk->d_sync.ds_bios != NULL) {
|
|
i = (int)(uintptr_t)bp->bio_caller1;
|
|
disk->d_sync.ds_bios[i] = NULL;
|
|
}
|
|
free(bp->bio_data, M_MIRROR);
|
|
g_destroy_bio(bp);
|
|
}
|
|
|
|
/*
|
|
* Handle synchronization requests.
|
|
* Every synchronization request is two-steps process: first, READ request is
|
|
* send to active provider and then WRITE request (with read data) to the provider
|
|
* being synchronized. When WRITE is finished, new synchronization request is
|
|
* send.
|
|
*/
|
|
static void
|
|
g_mirror_sync_request(struct bio *bp)
|
|
{
|
|
struct g_mirror_softc *sc;
|
|
struct g_mirror_disk *disk;
|
|
struct g_mirror_disk_sync *sync;
|
|
|
|
bp->bio_from->index--;
|
|
sc = bp->bio_from->geom->softc;
|
|
disk = bp->bio_from->private;
|
|
if (disk == NULL) {
|
|
sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */
|
|
g_topology_lock();
|
|
g_mirror_kill_consumer(sc, bp->bio_from);
|
|
g_topology_unlock();
|
|
g_mirror_sync_request_free(NULL, bp);
|
|
sx_xlock(&sc->sc_lock);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Synchronization request.
|
|
*/
|
|
switch (bp->bio_cmd) {
|
|
case BIO_READ:
|
|
{
|
|
struct g_consumer *cp;
|
|
|
|
KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_sync_request_read,
|
|
bp->bio_error);
|
|
|
|
if (bp->bio_error != 0) {
|
|
G_MIRROR_LOGREQ(0, bp,
|
|
"Synchronization request failed (error=%d).",
|
|
bp->bio_error);
|
|
g_mirror_sync_request_free(disk, bp);
|
|
return;
|
|
}
|
|
G_MIRROR_LOGREQ(3, bp,
|
|
"Synchronization request half-finished.");
|
|
bp->bio_cmd = BIO_WRITE;
|
|
bp->bio_cflags = 0;
|
|
cp = disk->d_consumer;
|
|
KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
|
|
("Consumer %s not opened (r%dw%de%d).", cp->provider->name,
|
|
cp->acr, cp->acw, cp->ace));
|
|
cp->index++;
|
|
g_io_request(bp, cp);
|
|
return;
|
|
}
|
|
case BIO_WRITE:
|
|
{
|
|
off_t offset;
|
|
void *data;
|
|
int i;
|
|
|
|
KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_sync_request_write,
|
|
bp->bio_error);
|
|
|
|
if (bp->bio_error != 0) {
|
|
G_MIRROR_LOGREQ(0, bp,
|
|
"Synchronization request failed (error=%d).",
|
|
bp->bio_error);
|
|
g_mirror_sync_request_free(disk, bp);
|
|
sc->sc_bump_id |= G_MIRROR_BUMP_GENID;
|
|
g_mirror_event_send(disk,
|
|
G_MIRROR_DISK_STATE_DISCONNECTED,
|
|
G_MIRROR_EVENT_DONTWAIT);
|
|
return;
|
|
}
|
|
G_MIRROR_LOGREQ(3, bp, "Synchronization request finished.");
|
|
sync = &disk->d_sync;
|
|
if (sync->ds_offset >= sc->sc_mediasize ||
|
|
sync->ds_consumer == NULL ||
|
|
(sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) {
|
|
/* Don't send more synchronization requests. */
|
|
sync->ds_inflight--;
|
|
g_mirror_sync_request_free(disk, bp);
|
|
if (sync->ds_inflight > 0)
|
|
return;
|
|
if (sync->ds_consumer == NULL ||
|
|
(sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) {
|
|
return;
|
|
}
|
|
/* Disk up-to-date, activate it. */
|
|
g_mirror_event_send(disk, G_MIRROR_DISK_STATE_ACTIVE,
|
|
G_MIRROR_EVENT_DONTWAIT);
|
|
return;
|
|
}
|
|
|
|
/* Send next synchronization request. */
|
|
data = bp->bio_data;
|
|
g_reset_bio(bp);
|
|
bp->bio_cmd = BIO_READ;
|
|
bp->bio_offset = sync->ds_offset;
|
|
bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset);
|
|
sync->ds_offset += bp->bio_length;
|
|
bp->bio_done = g_mirror_sync_done;
|
|
bp->bio_data = data;
|
|
bp->bio_from = sync->ds_consumer;
|
|
bp->bio_to = sc->sc_provider;
|
|
G_MIRROR_LOGREQ(3, bp, "Sending synchronization request.");
|
|
sync->ds_consumer->index++;
|
|
/*
|
|
* Delay the request if it is colliding with a regular request.
|
|
*/
|
|
if (g_mirror_regular_collision(sc, bp))
|
|
g_mirror_sync_delay(sc, bp);
|
|
else
|
|
g_io_request(bp, sync->ds_consumer);
|
|
|
|
/* Release delayed requests if possible. */
|
|
g_mirror_regular_release(sc);
|
|
|
|
/* Find the smallest offset */
|
|
offset = sc->sc_mediasize;
|
|
for (i = 0; i < g_mirror_syncreqs; i++) {
|
|
bp = sync->ds_bios[i];
|
|
if (bp->bio_offset < offset)
|
|
offset = bp->bio_offset;
|
|
}
|
|
if (sync->ds_offset_done + (MAXPHYS * 100) < offset) {
|
|
/* Update offset_done on every 100 blocks. */
|
|
sync->ds_offset_done = offset;
|
|
g_mirror_update_metadata(disk);
|
|
}
|
|
return;
|
|
}
|
|
default:
|
|
KASSERT(1 == 0, ("Invalid command here: %u (device=%s)",
|
|
bp->bio_cmd, sc->sc_name));
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
g_mirror_request_prefer(struct g_mirror_softc *sc, struct bio *bp)
|
|
{
|
|
struct g_mirror_disk *disk;
|
|
struct g_consumer *cp;
|
|
struct bio *cbp;
|
|
|
|
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
|
|
if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE)
|
|
break;
|
|
}
|
|
if (disk == NULL) {
|
|
if (bp->bio_error == 0)
|
|
bp->bio_error = ENXIO;
|
|
g_io_deliver(bp, bp->bio_error);
|
|
return;
|
|
}
|
|
cbp = g_clone_bio(bp);
|
|
if (cbp == NULL) {
|
|
if (bp->bio_error == 0)
|
|
bp->bio_error = ENOMEM;
|
|
g_io_deliver(bp, bp->bio_error);
|
|
return;
|
|
}
|
|
/*
|
|
* Fill in the component buf structure.
|
|
*/
|
|
cp = disk->d_consumer;
|
|
cbp->bio_done = g_mirror_done;
|
|
cbp->bio_to = cp->provider;
|
|
G_MIRROR_LOGREQ(3, cbp, "Sending request.");
|
|
KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
|
|
("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr,
|
|
cp->acw, cp->ace));
|
|
cp->index++;
|
|
g_io_request(cbp, cp);
|
|
}
|
|
|
|
static void
|
|
g_mirror_request_round_robin(struct g_mirror_softc *sc, struct bio *bp)
|
|
{
|
|
struct g_mirror_disk *disk;
|
|
struct g_consumer *cp;
|
|
struct bio *cbp;
|
|
|
|
disk = g_mirror_get_disk(sc);
|
|
if (disk == NULL) {
|
|
if (bp->bio_error == 0)
|
|
bp->bio_error = ENXIO;
|
|
g_io_deliver(bp, bp->bio_error);
|
|
return;
|
|
}
|
|
cbp = g_clone_bio(bp);
|
|
if (cbp == NULL) {
|
|
if (bp->bio_error == 0)
|
|
bp->bio_error = ENOMEM;
|
|
g_io_deliver(bp, bp->bio_error);
|
|
return;
|
|
}
|
|
/*
|
|
* Fill in the component buf structure.
|
|
*/
|
|
cp = disk->d_consumer;
|
|
cbp->bio_done = g_mirror_done;
|
|
cbp->bio_to = cp->provider;
|
|
G_MIRROR_LOGREQ(3, cbp, "Sending request.");
|
|
KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
|
|
("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr,
|
|
cp->acw, cp->ace));
|
|
cp->index++;
|
|
g_io_request(cbp, cp);
|
|
}
|
|
|
|
#define TRACK_SIZE (1 * 1024 * 1024)
|
|
#define LOAD_SCALE 256
|
|
#define ABS(x) (((x) >= 0) ? (x) : (-(x)))
|
|
|
|
static void
|
|
g_mirror_request_load(struct g_mirror_softc *sc, struct bio *bp)
|
|
{
|
|
struct g_mirror_disk *disk, *dp;
|
|
struct g_consumer *cp;
|
|
struct bio *cbp;
|
|
int prio, best;
|
|
|
|
/* Find a disk with the smallest load. */
|
|
disk = NULL;
|
|
best = INT_MAX;
|
|
LIST_FOREACH(dp, &sc->sc_disks, d_next) {
|
|
if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE)
|
|
continue;
|
|
prio = dp->load;
|
|
/* If disk head is precisely in position - highly prefer it. */
|
|
if (dp->d_last_offset == bp->bio_offset)
|
|
prio -= 2 * LOAD_SCALE;
|
|
else
|
|
/* If disk head is close to position - prefer it. */
|
|
if (ABS(dp->d_last_offset - bp->bio_offset) < TRACK_SIZE)
|
|
prio -= 1 * LOAD_SCALE;
|
|
if (prio <= best) {
|
|
disk = dp;
|
|
best = prio;
|
|
}
|
|
}
|
|
KASSERT(disk != NULL, ("NULL disk for %s.", sc->sc_name));
|
|
cbp = g_clone_bio(bp);
|
|
if (cbp == NULL) {
|
|
if (bp->bio_error == 0)
|
|
bp->bio_error = ENOMEM;
|
|
g_io_deliver(bp, bp->bio_error);
|
|
return;
|
|
}
|
|
/*
|
|
* Fill in the component buf structure.
|
|
*/
|
|
cp = disk->d_consumer;
|
|
cbp->bio_done = g_mirror_done;
|
|
cbp->bio_to = cp->provider;
|
|
G_MIRROR_LOGREQ(3, cbp, "Sending request.");
|
|
KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
|
|
("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr,
|
|
cp->acw, cp->ace));
|
|
cp->index++;
|
|
/* Remember last head position */
|
|
disk->d_last_offset = bp->bio_offset + bp->bio_length;
|
|
/* Update loads. */
|
|
LIST_FOREACH(dp, &sc->sc_disks, d_next) {
|
|
dp->load = (dp->d_consumer->index * LOAD_SCALE +
|
|
dp->load * 7) / 8;
|
|
}
|
|
g_io_request(cbp, cp);
|
|
}
|
|
|
|
static void
|
|
g_mirror_request_split(struct g_mirror_softc *sc, struct bio *bp)
|
|
{
|
|
struct bio_queue_head queue;
|
|
struct g_mirror_disk *disk;
|
|
struct g_consumer *cp;
|
|
struct bio *cbp;
|
|
off_t left, mod, offset, slice;
|
|
u_char *data;
|
|
u_int ndisks;
|
|
|
|
if (bp->bio_length <= sc->sc_slice) {
|
|
g_mirror_request_round_robin(sc, bp);
|
|
return;
|
|
}
|
|
ndisks = g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE);
|
|
slice = bp->bio_length / ndisks;
|
|
mod = slice % sc->sc_provider->sectorsize;
|
|
if (mod != 0)
|
|
slice += sc->sc_provider->sectorsize - mod;
|
|
/*
|
|
* Allocate all bios before sending any request, so we can
|
|
* return ENOMEM in nice and clean way.
|
|
*/
|
|
left = bp->bio_length;
|
|
offset = bp->bio_offset;
|
|
data = bp->bio_data;
|
|
bioq_init(&queue);
|
|
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
|
|
if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE)
|
|
continue;
|
|
cbp = g_clone_bio(bp);
|
|
if (cbp == NULL) {
|
|
while ((cbp = bioq_takefirst(&queue)) != NULL)
|
|
g_destroy_bio(cbp);
|
|
if (bp->bio_error == 0)
|
|
bp->bio_error = ENOMEM;
|
|
g_io_deliver(bp, bp->bio_error);
|
|
return;
|
|
}
|
|
bioq_insert_tail(&queue, cbp);
|
|
cbp->bio_done = g_mirror_done;
|
|
cbp->bio_caller1 = disk;
|
|
cbp->bio_to = disk->d_consumer->provider;
|
|
cbp->bio_offset = offset;
|
|
cbp->bio_data = data;
|
|
cbp->bio_length = MIN(left, slice);
|
|
left -= cbp->bio_length;
|
|
if (left == 0)
|
|
break;
|
|
offset += cbp->bio_length;
|
|
data += cbp->bio_length;
|
|
}
|
|
while ((cbp = bioq_takefirst(&queue)) != NULL) {
|
|
G_MIRROR_LOGREQ(3, cbp, "Sending request.");
|
|
disk = cbp->bio_caller1;
|
|
cbp->bio_caller1 = NULL;
|
|
cp = disk->d_consumer;
|
|
KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
|
|
("Consumer %s not opened (r%dw%de%d).", cp->provider->name,
|
|
cp->acr, cp->acw, cp->ace));
|
|
disk->d_consumer->index++;
|
|
g_io_request(cbp, disk->d_consumer);
|
|
}
|
|
}
|
|
|
|
static void
|
|
g_mirror_register_request(struct bio *bp)
|
|
{
|
|
struct g_mirror_softc *sc;
|
|
|
|
sc = bp->bio_to->private;
|
|
switch (bp->bio_cmd) {
|
|
case BIO_READ:
|
|
switch (sc->sc_balance) {
|
|
case G_MIRROR_BALANCE_LOAD:
|
|
g_mirror_request_load(sc, bp);
|
|
break;
|
|
case G_MIRROR_BALANCE_PREFER:
|
|
g_mirror_request_prefer(sc, bp);
|
|
break;
|
|
case G_MIRROR_BALANCE_ROUND_ROBIN:
|
|
g_mirror_request_round_robin(sc, bp);
|
|
break;
|
|
case G_MIRROR_BALANCE_SPLIT:
|
|
g_mirror_request_split(sc, bp);
|
|
break;
|
|
}
|
|
return;
|
|
case BIO_WRITE:
|
|
case BIO_DELETE:
|
|
{
|
|
struct g_mirror_disk *disk;
|
|
struct g_mirror_disk_sync *sync;
|
|
struct bio_queue_head queue;
|
|
struct g_consumer *cp;
|
|
struct bio *cbp;
|
|
|
|
/*
|
|
* Delay the request if it is colliding with a synchronization
|
|
* request.
|
|
*/
|
|
if (g_mirror_sync_collision(sc, bp)) {
|
|
g_mirror_regular_delay(sc, bp);
|
|
return;
|
|
}
|
|
|
|
if (sc->sc_idle)
|
|
g_mirror_unidle(sc);
|
|
else
|
|
sc->sc_last_write = time_uptime;
|
|
|
|
/*
|
|
* Bump syncid on first write.
|
|
*/
|
|
if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) {
|
|
sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID;
|
|
g_mirror_bump_syncid(sc);
|
|
}
|
|
|
|
/*
|
|
* Allocate all bios before sending any request, so we can
|
|
* return ENOMEM in nice and clean way.
|
|
*/
|
|
bioq_init(&queue);
|
|
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
|
|
sync = &disk->d_sync;
|
|
switch (disk->d_state) {
|
|
case G_MIRROR_DISK_STATE_ACTIVE:
|
|
break;
|
|
case G_MIRROR_DISK_STATE_SYNCHRONIZING:
|
|
if (bp->bio_offset >= sync->ds_offset)
|
|
continue;
|
|
break;
|
|
default:
|
|
continue;
|
|
}
|
|
if (bp->bio_cmd == BIO_DELETE &&
|
|
(disk->d_flags & G_MIRROR_DISK_FLAG_CANDELETE) == 0)
|
|
continue;
|
|
cbp = g_clone_bio(bp);
|
|
if (cbp == NULL) {
|
|
while ((cbp = bioq_takefirst(&queue)) != NULL)
|
|
g_destroy_bio(cbp);
|
|
if (bp->bio_error == 0)
|
|
bp->bio_error = ENOMEM;
|
|
g_io_deliver(bp, bp->bio_error);
|
|
return;
|
|
}
|
|
bioq_insert_tail(&queue, cbp);
|
|
cbp->bio_done = g_mirror_done;
|
|
cp = disk->d_consumer;
|
|
cbp->bio_caller1 = cp;
|
|
cbp->bio_to = cp->provider;
|
|
KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
|
|
("Consumer %s not opened (r%dw%de%d).",
|
|
cp->provider->name, cp->acr, cp->acw, cp->ace));
|
|
}
|
|
if (bioq_first(&queue) == NULL) {
|
|
g_io_deliver(bp, EOPNOTSUPP);
|
|
return;
|
|
}
|
|
while ((cbp = bioq_takefirst(&queue)) != NULL) {
|
|
G_MIRROR_LOGREQ(3, cbp, "Sending request.");
|
|
cp = cbp->bio_caller1;
|
|
cbp->bio_caller1 = NULL;
|
|
cp->index++;
|
|
sc->sc_writes++;
|
|
g_io_request(cbp, cp);
|
|
}
|
|
/*
|
|
* Put request onto inflight queue, so we can check if new
|
|
* synchronization requests don't collide with it.
|
|
*/
|
|
bioq_insert_tail(&sc->sc_inflight, bp);
|
|
return;
|
|
}
|
|
default:
|
|
KASSERT(1 == 0, ("Invalid command here: %u (device=%s)",
|
|
bp->bio_cmd, sc->sc_name));
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int
|
|
g_mirror_can_destroy(struct g_mirror_softc *sc)
|
|
{
|
|
struct g_geom *gp;
|
|
struct g_consumer *cp;
|
|
|
|
g_topology_assert();
|
|
gp = sc->sc_geom;
|
|
if (gp->softc == NULL)
|
|
return (1);
|
|
if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_TASTING) != 0)
|
|
return (0);
|
|
LIST_FOREACH(cp, &gp->consumer, consumer) {
|
|
if (g_mirror_is_busy(sc, cp))
|
|
return (0);
|
|
}
|
|
gp = sc->sc_sync.ds_geom;
|
|
LIST_FOREACH(cp, &gp->consumer, consumer) {
|
|
if (g_mirror_is_busy(sc, cp))
|
|
return (0);
|
|
}
|
|
G_MIRROR_DEBUG(2, "No I/O requests for %s, it can be destroyed.",
|
|
sc->sc_name);
|
|
return (1);
|
|
}
|
|
|
|
static int
|
|
g_mirror_try_destroy(struct g_mirror_softc *sc)
|
|
{
|
|
|
|
if (sc->sc_rootmount != NULL) {
|
|
G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__,
|
|
sc->sc_rootmount);
|
|
root_mount_rel(sc->sc_rootmount);
|
|
sc->sc_rootmount = NULL;
|
|
}
|
|
g_topology_lock();
|
|
if (!g_mirror_can_destroy(sc)) {
|
|
g_topology_unlock();
|
|
return (0);
|
|
}
|
|
sc->sc_geom->softc = NULL;
|
|
sc->sc_sync.ds_geom->softc = NULL;
|
|
if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_WAIT) != 0) {
|
|
g_topology_unlock();
|
|
G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__,
|
|
&sc->sc_worker);
|
|
/* Unlock sc_lock here, as it can be destroyed after wakeup. */
|
|
sx_xunlock(&sc->sc_lock);
|
|
wakeup(&sc->sc_worker);
|
|
sc->sc_worker = NULL;
|
|
} else {
|
|
g_topology_unlock();
|
|
g_mirror_destroy_device(sc);
|
|
}
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Worker thread.
|
|
*/
|
|
static void
|
|
g_mirror_worker(void *arg)
|
|
{
|
|
struct g_mirror_softc *sc;
|
|
struct g_mirror_event *ep;
|
|
struct bio *bp;
|
|
int timeout;
|
|
|
|
sc = arg;
|
|
thread_lock(curthread);
|
|
sched_prio(curthread, PRIBIO);
|
|
thread_unlock(curthread);
|
|
|
|
sx_xlock(&sc->sc_lock);
|
|
for (;;) {
|
|
G_MIRROR_DEBUG(5, "%s: Let's see...", __func__);
|
|
/*
|
|
* First take a look at events.
|
|
* This is important to handle events before any I/O requests.
|
|
*/
|
|
ep = g_mirror_event_get(sc);
|
|
if (ep != NULL) {
|
|
g_mirror_event_remove(sc, ep);
|
|
if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) {
|
|
/* Update only device status. */
|
|
G_MIRROR_DEBUG(3,
|
|
"Running event for device %s.",
|
|
sc->sc_name);
|
|
ep->e_error = 0;
|
|
g_mirror_update_device(sc, true);
|
|
} else {
|
|
/* Update disk status. */
|
|
G_MIRROR_DEBUG(3, "Running event for disk %s.",
|
|
g_mirror_get_diskname(ep->e_disk));
|
|
ep->e_error = g_mirror_update_disk(ep->e_disk,
|
|
ep->e_state);
|
|
if (ep->e_error == 0)
|
|
g_mirror_update_device(sc, false);
|
|
}
|
|
if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) {
|
|
KASSERT(ep->e_error == 0,
|
|
("Error cannot be handled."));
|
|
g_mirror_event_free(ep);
|
|
} else {
|
|
ep->e_flags |= G_MIRROR_EVENT_DONE;
|
|
G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__,
|
|
ep);
|
|
mtx_lock(&sc->sc_events_mtx);
|
|
wakeup(ep);
|
|
mtx_unlock(&sc->sc_events_mtx);
|
|
}
|
|
if ((sc->sc_flags &
|
|
G_MIRROR_DEVICE_FLAG_DESTROY) != 0) {
|
|
if (g_mirror_try_destroy(sc)) {
|
|
curthread->td_pflags &= ~TDP_GEOM;
|
|
G_MIRROR_DEBUG(1, "Thread exiting.");
|
|
kproc_exit(0);
|
|
}
|
|
}
|
|
G_MIRROR_DEBUG(5, "%s: I'm here 1.", __func__);
|
|
continue;
|
|
}
|
|
/*
|
|
* Check if we can mark array as CLEAN and if we can't take
|
|
* how much seconds should we wait.
|
|
*/
|
|
timeout = g_mirror_idle(sc, -1);
|
|
/*
|
|
* Now I/O requests.
|
|
*/
|
|
/* Get first request from the queue. */
|
|
mtx_lock(&sc->sc_queue_mtx);
|
|
bp = bioq_takefirst(&sc->sc_queue);
|
|
if (bp == NULL) {
|
|
if ((sc->sc_flags &
|
|
G_MIRROR_DEVICE_FLAG_DESTROY) != 0) {
|
|
mtx_unlock(&sc->sc_queue_mtx);
|
|
if (g_mirror_try_destroy(sc)) {
|
|
curthread->td_pflags &= ~TDP_GEOM;
|
|
G_MIRROR_DEBUG(1, "Thread exiting.");
|
|
kproc_exit(0);
|
|
}
|
|
mtx_lock(&sc->sc_queue_mtx);
|
|
}
|
|
sx_xunlock(&sc->sc_lock);
|
|
/*
|
|
* XXX: We can miss an event here, because an event
|
|
* can be added without sx-device-lock and without
|
|
* mtx-queue-lock. Maybe I should just stop using
|
|
* dedicated mutex for events synchronization and
|
|
* stick with the queue lock?
|
|
* The event will hang here until next I/O request
|
|
* or next event is received.
|
|
*/
|
|
MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, "m:w1",
|
|
timeout * hz);
|
|
sx_xlock(&sc->sc_lock);
|
|
G_MIRROR_DEBUG(5, "%s: I'm here 4.", __func__);
|
|
continue;
|
|
}
|
|
mtx_unlock(&sc->sc_queue_mtx);
|
|
|
|
if (bp->bio_from->geom == sc->sc_sync.ds_geom &&
|
|
(bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) {
|
|
g_mirror_sync_request(bp); /* READ */
|
|
} else if (bp->bio_to != sc->sc_provider) {
|
|
if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_REGULAR) != 0)
|
|
g_mirror_regular_request(bp);
|
|
else if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0)
|
|
g_mirror_sync_request(bp); /* WRITE */
|
|
else {
|
|
KASSERT(0,
|
|
("Invalid request cflags=0x%hx to=%s.",
|
|
bp->bio_cflags, bp->bio_to->name));
|
|
}
|
|
} else {
|
|
g_mirror_register_request(bp);
|
|
}
|
|
G_MIRROR_DEBUG(5, "%s: I'm here 9.", __func__);
|
|
}
|
|
}
|
|
|
|
static void
|
|
g_mirror_update_idle(struct g_mirror_softc *sc, struct g_mirror_disk *disk)
|
|
{
|
|
|
|
sx_assert(&sc->sc_lock, SX_LOCKED);
|
|
|
|
if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0)
|
|
return;
|
|
if (!sc->sc_idle && (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0) {
|
|
G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as dirty.",
|
|
g_mirror_get_diskname(disk), sc->sc_name);
|
|
disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY;
|
|
} else if (sc->sc_idle &&
|
|
(disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) {
|
|
G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as clean.",
|
|
g_mirror_get_diskname(disk), sc->sc_name);
|
|
disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
|
|
}
|
|
}
|
|
|
|
static void
|
|
g_mirror_sync_start(struct g_mirror_disk *disk)
|
|
{
|
|
struct g_mirror_softc *sc;
|
|
struct g_consumer *cp;
|
|
struct bio *bp;
|
|
int error, i;
|
|
|
|
g_topology_assert_not();
|
|
sc = disk->d_softc;
|
|
sx_assert(&sc->sc_lock, SX_LOCKED);
|
|
|
|
KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING,
|
|
("Disk %s is not marked for synchronization.",
|
|
g_mirror_get_diskname(disk)));
|
|
KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
|
|
("Device not in RUNNING state (%s, %u).", sc->sc_name,
|
|
sc->sc_state));
|
|
|
|
sx_xunlock(&sc->sc_lock);
|
|
g_topology_lock();
|
|
cp = g_new_consumer(sc->sc_sync.ds_geom);
|
|
cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
|
|
error = g_attach(cp, sc->sc_provider);
|
|
KASSERT(error == 0,
|
|
("Cannot attach to %s (error=%d).", sc->sc_name, error));
|
|
error = g_access(cp, 1, 0, 0);
|
|
KASSERT(error == 0, ("Cannot open %s (error=%d).", sc->sc_name, error));
|
|
g_topology_unlock();
|
|
sx_xlock(&sc->sc_lock);
|
|
|
|
G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s.", sc->sc_name,
|
|
g_mirror_get_diskname(disk));
|
|
if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) == 0)
|
|
disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY;
|
|
KASSERT(disk->d_sync.ds_consumer == NULL,
|
|
("Sync consumer already exists (device=%s, disk=%s).",
|
|
sc->sc_name, g_mirror_get_diskname(disk)));
|
|
|
|
disk->d_sync.ds_consumer = cp;
|
|
disk->d_sync.ds_consumer->private = disk;
|
|
disk->d_sync.ds_consumer->index = 0;
|
|
|
|
/*
|
|
* Allocate memory for synchronization bios and initialize them.
|
|
*/
|
|
disk->d_sync.ds_bios = malloc(sizeof(struct bio *) * g_mirror_syncreqs,
|
|
M_MIRROR, M_WAITOK);
|
|
for (i = 0; i < g_mirror_syncreqs; i++) {
|
|
bp = g_alloc_bio();
|
|
disk->d_sync.ds_bios[i] = bp;
|
|
bp->bio_parent = NULL;
|
|
bp->bio_cmd = BIO_READ;
|
|
bp->bio_data = malloc(MAXPHYS, M_MIRROR, M_WAITOK);
|
|
bp->bio_cflags = 0;
|
|
bp->bio_offset = disk->d_sync.ds_offset;
|
|
bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset);
|
|
disk->d_sync.ds_offset += bp->bio_length;
|
|
bp->bio_done = g_mirror_sync_done;
|
|
bp->bio_from = disk->d_sync.ds_consumer;
|
|
bp->bio_to = sc->sc_provider;
|
|
bp->bio_caller1 = (void *)(uintptr_t)i;
|
|
}
|
|
|
|
/* Increase the number of disks in SYNCHRONIZING state. */
|
|
sc->sc_sync.ds_ndisks++;
|
|
/* Set the number of in-flight synchronization requests. */
|
|
disk->d_sync.ds_inflight = g_mirror_syncreqs;
|
|
|
|
/*
|
|
* Fire off first synchronization requests.
|
|
*/
|
|
for (i = 0; i < g_mirror_syncreqs; i++) {
|
|
bp = disk->d_sync.ds_bios[i];
|
|
G_MIRROR_LOGREQ(3, bp, "Sending synchronization request.");
|
|
disk->d_sync.ds_consumer->index++;
|
|
/*
|
|
* Delay the request if it is colliding with a regular request.
|
|
*/
|
|
if (g_mirror_regular_collision(sc, bp))
|
|
g_mirror_sync_delay(sc, bp);
|
|
else
|
|
g_io_request(bp, disk->d_sync.ds_consumer);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Stop synchronization process.
|
|
* type: 0 - synchronization finished
|
|
* 1 - synchronization stopped
|
|
*/
|
|
static void
|
|
g_mirror_sync_stop(struct g_mirror_disk *disk, int type)
|
|
{
|
|
struct g_mirror_softc *sc;
|
|
struct g_consumer *cp;
|
|
|
|
g_topology_assert_not();
|
|
sc = disk->d_softc;
|
|
sx_assert(&sc->sc_lock, SX_LOCKED);
|
|
|
|
KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING,
|
|
("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk),
|
|
g_mirror_disk_state2str(disk->d_state)));
|
|
if (disk->d_sync.ds_consumer == NULL)
|
|
return;
|
|
|
|
if (type == 0) {
|
|
G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s finished.",
|
|
sc->sc_name, g_mirror_get_diskname(disk));
|
|
} else /* if (type == 1) */ {
|
|
G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s stopped.",
|
|
sc->sc_name, g_mirror_get_diskname(disk));
|
|
}
|
|
g_mirror_regular_release(sc);
|
|
free(disk->d_sync.ds_bios, M_MIRROR);
|
|
disk->d_sync.ds_bios = NULL;
|
|
cp = disk->d_sync.ds_consumer;
|
|
disk->d_sync.ds_consumer = NULL;
|
|
disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
|
|
sc->sc_sync.ds_ndisks--;
|
|
sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */
|
|
g_topology_lock();
|
|
g_mirror_kill_consumer(sc, cp);
|
|
g_topology_unlock();
|
|
sx_xlock(&sc->sc_lock);
|
|
}
|
|
|
|
static void
|
|
g_mirror_launch_provider(struct g_mirror_softc *sc)
|
|
{
|
|
struct g_mirror_disk *disk;
|
|
struct g_provider *pp, *dp;
|
|
|
|
sx_assert(&sc->sc_lock, SX_LOCKED);
|
|
|
|
g_topology_lock();
|
|
pp = g_new_providerf(sc->sc_geom, "mirror/%s", sc->sc_name);
|
|
pp->flags |= G_PF_DIRECT_RECEIVE;
|
|
pp->mediasize = sc->sc_mediasize;
|
|
pp->sectorsize = sc->sc_sectorsize;
|
|
pp->stripesize = 0;
|
|
pp->stripeoffset = 0;
|
|
|
|
/* Splitting of unmapped BIO's could work but isn't implemented now */
|
|
if (sc->sc_balance != G_MIRROR_BALANCE_SPLIT)
|
|
pp->flags |= G_PF_ACCEPT_UNMAPPED;
|
|
|
|
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
|
|
if (disk->d_consumer && disk->d_consumer->provider) {
|
|
dp = disk->d_consumer->provider;
|
|
if (dp->stripesize > pp->stripesize) {
|
|
pp->stripesize = dp->stripesize;
|
|
pp->stripeoffset = dp->stripeoffset;
|
|
}
|
|
/* A provider underneath us doesn't support unmapped */
|
|
if ((dp->flags & G_PF_ACCEPT_UNMAPPED) == 0) {
|
|
G_MIRROR_DEBUG(0, "Cancelling unmapped "
|
|
"because of %s.", dp->name);
|
|
pp->flags &= ~G_PF_ACCEPT_UNMAPPED;
|
|
}
|
|
}
|
|
}
|
|
pp->private = sc;
|
|
sc->sc_refcnt++;
|
|
sc->sc_provider = pp;
|
|
g_error_provider(pp, 0);
|
|
g_topology_unlock();
|
|
G_MIRROR_DEBUG(0, "Device %s launched (%u/%u).", pp->name,
|
|
g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE), sc->sc_ndisks);
|
|
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
|
|
if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING)
|
|
g_mirror_sync_start(disk);
|
|
}
|
|
}
|
|
|
|
static void
|
|
g_mirror_destroy_provider(struct g_mirror_softc *sc)
|
|
{
|
|
struct g_mirror_disk *disk;
|
|
struct bio *bp;
|
|
|
|
g_topology_assert_not();
|
|
KASSERT(sc->sc_provider != NULL, ("NULL provider (device=%s).",
|
|
sc->sc_name));
|
|
|
|
g_topology_lock();
|
|
g_error_provider(sc->sc_provider, ENXIO);
|
|
mtx_lock(&sc->sc_queue_mtx);
|
|
while ((bp = bioq_takefirst(&sc->sc_queue)) != NULL) {
|
|
/*
|
|
* Abort any pending I/O that wasn't generated by us.
|
|
* Synchronization requests and requests destined for individual
|
|
* mirror components can be destroyed immediately.
|
|
*/
|
|
if (bp->bio_to == sc->sc_provider &&
|
|
bp->bio_from->geom != sc->sc_sync.ds_geom) {
|
|
g_io_deliver(bp, ENXIO);
|
|
} else {
|
|
if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0)
|
|
free(bp->bio_data, M_MIRROR);
|
|
g_destroy_bio(bp);
|
|
}
|
|
}
|
|
mtx_unlock(&sc->sc_queue_mtx);
|
|
g_wither_provider(sc->sc_provider, ENXIO);
|
|
sc->sc_provider = NULL;
|
|
G_MIRROR_DEBUG(0, "Device %s: provider destroyed.", sc->sc_name);
|
|
g_topology_unlock();
|
|
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
|
|
if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING)
|
|
g_mirror_sync_stop(disk, 1);
|
|
}
|
|
}
|
|
|
|
static void
|
|
g_mirror_go(void *arg)
|
|
{
|
|
struct g_mirror_softc *sc;
|
|
|
|
sc = arg;
|
|
G_MIRROR_DEBUG(0, "Force device %s start due to timeout.", sc->sc_name);
|
|
g_mirror_event_send(sc, 0,
|
|
G_MIRROR_EVENT_DONTWAIT | G_MIRROR_EVENT_DEVICE);
|
|
}
|
|
|
|
static u_int
|
|
g_mirror_determine_state(struct g_mirror_disk *disk)
|
|
{
|
|
struct g_mirror_softc *sc;
|
|
u_int state;
|
|
|
|
sc = disk->d_softc;
|
|
if (sc->sc_syncid == disk->d_sync.ds_syncid) {
|
|
if ((disk->d_flags &
|
|
G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) {
|
|
/* Disk does not need synchronization. */
|
|
state = G_MIRROR_DISK_STATE_ACTIVE;
|
|
} else {
|
|
if ((sc->sc_flags &
|
|
G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 ||
|
|
(disk->d_flags &
|
|
G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) {
|
|
/*
|
|
* We can start synchronization from
|
|
* the stored offset.
|
|
*/
|
|
state = G_MIRROR_DISK_STATE_SYNCHRONIZING;
|
|
} else {
|
|
state = G_MIRROR_DISK_STATE_STALE;
|
|
}
|
|
}
|
|
} else if (disk->d_sync.ds_syncid < sc->sc_syncid) {
|
|
/*
|
|
* Reset all synchronization data for this disk,
|
|
* because if it even was synchronized, it was
|
|
* synchronized to disks with different syncid.
|
|
*/
|
|
disk->d_flags |= G_MIRROR_DISK_FLAG_SYNCHRONIZING;
|
|
disk->d_sync.ds_offset = 0;
|
|
disk->d_sync.ds_offset_done = 0;
|
|
disk->d_sync.ds_syncid = sc->sc_syncid;
|
|
if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 ||
|
|
(disk->d_flags & G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) {
|
|
state = G_MIRROR_DISK_STATE_SYNCHRONIZING;
|
|
} else {
|
|
state = G_MIRROR_DISK_STATE_STALE;
|
|
}
|
|
} else /* if (sc->sc_syncid < disk->d_sync.ds_syncid) */ {
|
|
/*
|
|
* Not good, NOT GOOD!
|
|
* It means that mirror was started on stale disks
|
|
* and more fresh disk just arrive.
|
|
* If there were writes, mirror is broken, sorry.
|
|
* I think the best choice here is don't touch
|
|
* this disk and inform the user loudly.
|
|
*/
|
|
G_MIRROR_DEBUG(0, "Device %s was started before the freshest "
|
|
"disk (%s) arrives!! It will not be connected to the "
|
|
"running device.", sc->sc_name,
|
|
g_mirror_get_diskname(disk));
|
|
g_mirror_destroy_disk(disk);
|
|
state = G_MIRROR_DISK_STATE_NONE;
|
|
/* Return immediately, because disk was destroyed. */
|
|
return (state);
|
|
}
|
|
G_MIRROR_DEBUG(3, "State for %s disk: %s.",
|
|
g_mirror_get_diskname(disk), g_mirror_disk_state2str(state));
|
|
return (state);
|
|
}
|
|
|
|
/*
|
|
* Update device state.
|
|
*/
|
|
static void
|
|
g_mirror_update_device(struct g_mirror_softc *sc, bool force)
|
|
{
|
|
struct g_mirror_disk *disk;
|
|
u_int state;
|
|
|
|
sx_assert(&sc->sc_lock, SX_XLOCKED);
|
|
|
|
switch (sc->sc_state) {
|
|
case G_MIRROR_DEVICE_STATE_STARTING:
|
|
{
|
|
struct g_mirror_disk *pdisk, *tdisk;
|
|
u_int dirty, ndisks, genid, syncid;
|
|
bool broken;
|
|
|
|
KASSERT(sc->sc_provider == NULL,
|
|
("Non-NULL provider in STARTING state (%s).", sc->sc_name));
|
|
/*
|
|
* Are we ready? We are, if all disks are connected or
|
|
* if we have any disks and 'force' is true.
|
|
*/
|
|
ndisks = g_mirror_ndisks(sc, -1);
|
|
if (sc->sc_ndisks == ndisks || (force && ndisks > 0)) {
|
|
;
|
|
} else if (ndisks == 0) {
|
|
/*
|
|
* Disks went down in starting phase, so destroy
|
|
* device.
|
|
*/
|
|
callout_drain(&sc->sc_callout);
|
|
sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY;
|
|
G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__,
|
|
sc->sc_rootmount);
|
|
root_mount_rel(sc->sc_rootmount);
|
|
sc->sc_rootmount = NULL;
|
|
return;
|
|
} else {
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Activate all disks with the biggest syncid.
|
|
*/
|
|
if (force) {
|
|
/*
|
|
* If 'force' is true, we have been called due to
|
|
* timeout, so don't bother canceling timeout.
|
|
*/
|
|
ndisks = 0;
|
|
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
|
|
if ((disk->d_flags &
|
|
G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) {
|
|
ndisks++;
|
|
}
|
|
}
|
|
if (ndisks == 0) {
|
|
/* No valid disks found, destroy device. */
|
|
sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY;
|
|
G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p",
|
|
__LINE__, sc->sc_rootmount);
|
|
root_mount_rel(sc->sc_rootmount);
|
|
sc->sc_rootmount = NULL;
|
|
return;
|
|
}
|
|
} else {
|
|
/* Cancel timeout. */
|
|
callout_drain(&sc->sc_callout);
|
|
}
|
|
|
|
/*
|
|
* Find the biggest genid.
|
|
*/
|
|
genid = 0;
|
|
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
|
|
if (disk->d_genid > genid)
|
|
genid = disk->d_genid;
|
|
}
|
|
sc->sc_genid = genid;
|
|
/*
|
|
* Remove all disks without the biggest genid.
|
|
*/
|
|
broken = false;
|
|
LIST_FOREACH_SAFE(disk, &sc->sc_disks, d_next, tdisk) {
|
|
if (disk->d_genid < genid) {
|
|
G_MIRROR_DEBUG(0,
|
|
"Component %s (device %s) broken, skipping.",
|
|
g_mirror_get_diskname(disk), sc->sc_name);
|
|
g_mirror_destroy_disk(disk);
|
|
/*
|
|
* Bump the syncid in case we discover a healthy
|
|
* replacement disk after starting the mirror.
|
|
*/
|
|
broken = true;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Find the biggest syncid.
|
|
*/
|
|
syncid = 0;
|
|
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
|
|
if (disk->d_sync.ds_syncid > syncid)
|
|
syncid = disk->d_sync.ds_syncid;
|
|
}
|
|
|
|
/*
|
|
* Here we need to look for dirty disks and if all disks
|
|
* with the biggest syncid are dirty, we have to choose
|
|
* one with the biggest priority and rebuild the rest.
|
|
*/
|
|
/*
|
|
* Find the number of dirty disks with the biggest syncid.
|
|
* Find the number of disks with the biggest syncid.
|
|
* While here, find a disk with the biggest priority.
|
|
*/
|
|
dirty = ndisks = 0;
|
|
pdisk = NULL;
|
|
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
|
|
if (disk->d_sync.ds_syncid != syncid)
|
|
continue;
|
|
if ((disk->d_flags &
|
|
G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) {
|
|
continue;
|
|
}
|
|
ndisks++;
|
|
if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) {
|
|
dirty++;
|
|
if (pdisk == NULL ||
|
|
pdisk->d_priority < disk->d_priority) {
|
|
pdisk = disk;
|
|
}
|
|
}
|
|
}
|
|
if (dirty == 0) {
|
|
/* No dirty disks at all, great. */
|
|
} else if (dirty == ndisks) {
|
|
/*
|
|
* Force synchronization for all dirty disks except one
|
|
* with the biggest priority.
|
|
*/
|
|
KASSERT(pdisk != NULL, ("pdisk == NULL"));
|
|
G_MIRROR_DEBUG(1, "Using disk %s (device %s) as a "
|
|
"master disk for synchronization.",
|
|
g_mirror_get_diskname(pdisk), sc->sc_name);
|
|
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
|
|
if (disk->d_sync.ds_syncid != syncid)
|
|
continue;
|
|
if ((disk->d_flags &
|
|
G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) {
|
|
continue;
|
|
}
|
|
KASSERT((disk->d_flags &
|
|
G_MIRROR_DISK_FLAG_DIRTY) != 0,
|
|
("Disk %s isn't marked as dirty.",
|
|
g_mirror_get_diskname(disk)));
|
|
/* Skip the disk with the biggest priority. */
|
|
if (disk == pdisk)
|
|
continue;
|
|
disk->d_sync.ds_syncid = 0;
|
|
}
|
|
} else if (dirty < ndisks) {
|
|
/*
|
|
* Force synchronization for all dirty disks.
|
|
* We have some non-dirty disks.
|
|
*/
|
|
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
|
|
if (disk->d_sync.ds_syncid != syncid)
|
|
continue;
|
|
if ((disk->d_flags &
|
|
G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) {
|
|
continue;
|
|
}
|
|
if ((disk->d_flags &
|
|
G_MIRROR_DISK_FLAG_DIRTY) == 0) {
|
|
continue;
|
|
}
|
|
disk->d_sync.ds_syncid = 0;
|
|
}
|
|
}
|
|
|
|
/* Reset hint. */
|
|
sc->sc_hint = NULL;
|
|
sc->sc_syncid = syncid;
|
|
if (force || broken) {
|
|
/* Remember to bump syncid on first write. */
|
|
sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID;
|
|
}
|
|
state = G_MIRROR_DEVICE_STATE_RUNNING;
|
|
G_MIRROR_DEBUG(1, "Device %s state changed from %s to %s.",
|
|
sc->sc_name, g_mirror_device_state2str(sc->sc_state),
|
|
g_mirror_device_state2str(state));
|
|
sc->sc_state = state;
|
|
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
|
|
state = g_mirror_determine_state(disk);
|
|
g_mirror_event_send(disk, state,
|
|
G_MIRROR_EVENT_DONTWAIT);
|
|
if (state == G_MIRROR_DISK_STATE_STALE)
|
|
sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID;
|
|
}
|
|
break;
|
|
}
|
|
case G_MIRROR_DEVICE_STATE_RUNNING:
|
|
if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 0 &&
|
|
g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) {
|
|
/*
|
|
* No active disks or no disks at all,
|
|
* so destroy device.
|
|
*/
|
|
if (sc->sc_provider != NULL)
|
|
g_mirror_destroy_provider(sc);
|
|
sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY;
|
|
break;
|
|
} else if (g_mirror_ndisks(sc,
|
|
G_MIRROR_DISK_STATE_ACTIVE) > 0 &&
|
|
g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) {
|
|
/*
|
|
* We have active disks, launch provider if it doesn't
|
|
* exist.
|
|
*/
|
|
if (sc->sc_provider == NULL)
|
|
g_mirror_launch_provider(sc);
|
|
if (sc->sc_rootmount != NULL) {
|
|
G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p",
|
|
__LINE__, sc->sc_rootmount);
|
|
root_mount_rel(sc->sc_rootmount);
|
|
sc->sc_rootmount = NULL;
|
|
}
|
|
}
|
|
/*
|
|
* Genid should be bumped immediately, so do it here.
|
|
*/
|
|
if ((sc->sc_bump_id & G_MIRROR_BUMP_GENID) != 0) {
|
|
sc->sc_bump_id &= ~G_MIRROR_BUMP_GENID;
|
|
g_mirror_bump_genid(sc);
|
|
}
|
|
break;
|
|
default:
|
|
KASSERT(1 == 0, ("Wrong device state (%s, %s).",
|
|
sc->sc_name, g_mirror_device_state2str(sc->sc_state)));
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Update disk state and device state if needed.
|
|
*/
|
|
#define DISK_STATE_CHANGED() G_MIRROR_DEBUG(1, \
|
|
"Disk %s state changed from %s to %s (device %s).", \
|
|
g_mirror_get_diskname(disk), \
|
|
g_mirror_disk_state2str(disk->d_state), \
|
|
g_mirror_disk_state2str(state), sc->sc_name)
|
|
static int
|
|
g_mirror_update_disk(struct g_mirror_disk *disk, u_int state)
|
|
{
|
|
struct g_mirror_softc *sc;
|
|
|
|
sc = disk->d_softc;
|
|
sx_assert(&sc->sc_lock, SX_XLOCKED);
|
|
|
|
again:
|
|
G_MIRROR_DEBUG(3, "Changing disk %s state from %s to %s.",
|
|
g_mirror_get_diskname(disk), g_mirror_disk_state2str(disk->d_state),
|
|
g_mirror_disk_state2str(state));
|
|
switch (state) {
|
|
case G_MIRROR_DISK_STATE_NEW:
|
|
/*
|
|
* Possible scenarios:
|
|
* 1. New disk arrive.
|
|
*/
|
|
/* Previous state should be NONE. */
|
|
KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NONE,
|
|
("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk),
|
|
g_mirror_disk_state2str(disk->d_state)));
|
|
DISK_STATE_CHANGED();
|
|
|
|
disk->d_state = state;
|
|
if (LIST_EMPTY(&sc->sc_disks))
|
|
LIST_INSERT_HEAD(&sc->sc_disks, disk, d_next);
|
|
else {
|
|
struct g_mirror_disk *dp;
|
|
|
|
LIST_FOREACH(dp, &sc->sc_disks, d_next) {
|
|
if (disk->d_priority >= dp->d_priority) {
|
|
LIST_INSERT_BEFORE(dp, disk, d_next);
|
|
dp = NULL;
|
|
break;
|
|
}
|
|
if (LIST_NEXT(dp, d_next) == NULL)
|
|
break;
|
|
}
|
|
if (dp != NULL)
|
|
LIST_INSERT_AFTER(dp, disk, d_next);
|
|
}
|
|
G_MIRROR_DEBUG(1, "Device %s: provider %s detected.",
|
|
sc->sc_name, g_mirror_get_diskname(disk));
|
|
if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING)
|
|
break;
|
|
KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
|
|
("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
|
|
g_mirror_device_state2str(sc->sc_state),
|
|
g_mirror_get_diskname(disk),
|
|
g_mirror_disk_state2str(disk->d_state)));
|
|
state = g_mirror_determine_state(disk);
|
|
if (state != G_MIRROR_DISK_STATE_NONE)
|
|
goto again;
|
|
break;
|
|
case G_MIRROR_DISK_STATE_ACTIVE:
|
|
/*
|
|
* Possible scenarios:
|
|
* 1. New disk does not need synchronization.
|
|
* 2. Synchronization process finished successfully.
|
|
*/
|
|
KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
|
|
("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
|
|
g_mirror_device_state2str(sc->sc_state),
|
|
g_mirror_get_diskname(disk),
|
|
g_mirror_disk_state2str(disk->d_state)));
|
|
/* Previous state should be NEW or SYNCHRONIZING. */
|
|
KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW ||
|
|
disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING,
|
|
("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk),
|
|
g_mirror_disk_state2str(disk->d_state)));
|
|
DISK_STATE_CHANGED();
|
|
|
|
if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) {
|
|
disk->d_flags &= ~G_MIRROR_DISK_FLAG_SYNCHRONIZING;
|
|
disk->d_flags &= ~G_MIRROR_DISK_FLAG_FORCE_SYNC;
|
|
g_mirror_sync_stop(disk, 0);
|
|
}
|
|
disk->d_state = state;
|
|
disk->d_sync.ds_offset = 0;
|
|
disk->d_sync.ds_offset_done = 0;
|
|
g_mirror_update_idle(sc, disk);
|
|
g_mirror_update_metadata(disk);
|
|
G_MIRROR_DEBUG(1, "Device %s: provider %s activated.",
|
|
sc->sc_name, g_mirror_get_diskname(disk));
|
|
break;
|
|
case G_MIRROR_DISK_STATE_STALE:
|
|
/*
|
|
* Possible scenarios:
|
|
* 1. Stale disk was connected.
|
|
*/
|
|
/* Previous state should be NEW. */
|
|
KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW,
|
|
("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk),
|
|
g_mirror_disk_state2str(disk->d_state)));
|
|
KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
|
|
("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
|
|
g_mirror_device_state2str(sc->sc_state),
|
|
g_mirror_get_diskname(disk),
|
|
g_mirror_disk_state2str(disk->d_state)));
|
|
/*
|
|
* STALE state is only possible if device is marked
|
|
* NOAUTOSYNC.
|
|
*/
|
|
KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) != 0,
|
|
("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
|
|
g_mirror_device_state2str(sc->sc_state),
|
|
g_mirror_get_diskname(disk),
|
|
g_mirror_disk_state2str(disk->d_state)));
|
|
DISK_STATE_CHANGED();
|
|
|
|
disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
|
|
disk->d_state = state;
|
|
g_mirror_update_metadata(disk);
|
|
G_MIRROR_DEBUG(0, "Device %s: provider %s is stale.",
|
|
sc->sc_name, g_mirror_get_diskname(disk));
|
|
break;
|
|
case G_MIRROR_DISK_STATE_SYNCHRONIZING:
|
|
/*
|
|
* Possible scenarios:
|
|
* 1. Disk which needs synchronization was connected.
|
|
*/
|
|
/* Previous state should be NEW. */
|
|
KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW,
|
|
("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk),
|
|
g_mirror_disk_state2str(disk->d_state)));
|
|
KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
|
|
("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
|
|
g_mirror_device_state2str(sc->sc_state),
|
|
g_mirror_get_diskname(disk),
|
|
g_mirror_disk_state2str(disk->d_state)));
|
|
DISK_STATE_CHANGED();
|
|
|
|
if (disk->d_state == G_MIRROR_DISK_STATE_NEW)
|
|
disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
|
|
disk->d_state = state;
|
|
if (sc->sc_provider != NULL) {
|
|
g_mirror_sync_start(disk);
|
|
g_mirror_update_metadata(disk);
|
|
}
|
|
break;
|
|
case G_MIRROR_DISK_STATE_DISCONNECTED:
|
|
/*
|
|
* Possible scenarios:
|
|
* 1. Device wasn't running yet, but disk disappear.
|
|
* 2. Disk was active and disapppear.
|
|
* 3. Disk disappear during synchronization process.
|
|
*/
|
|
if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING) {
|
|
/*
|
|
* Previous state should be ACTIVE, STALE or
|
|
* SYNCHRONIZING.
|
|
*/
|
|
KASSERT(disk->d_state == G_MIRROR_DISK_STATE_ACTIVE ||
|
|
disk->d_state == G_MIRROR_DISK_STATE_STALE ||
|
|
disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING,
|
|
("Wrong disk state (%s, %s).",
|
|
g_mirror_get_diskname(disk),
|
|
g_mirror_disk_state2str(disk->d_state)));
|
|
} else if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) {
|
|
/* Previous state should be NEW. */
|
|
KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW,
|
|
("Wrong disk state (%s, %s).",
|
|
g_mirror_get_diskname(disk),
|
|
g_mirror_disk_state2str(disk->d_state)));
|
|
/*
|
|
* Reset bumping syncid if disk disappeared in STARTING
|
|
* state.
|
|
*/
|
|
if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0)
|
|
sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID;
|
|
#ifdef INVARIANTS
|
|
} else {
|
|
KASSERT(1 == 0, ("Wrong device state (%s, %s, %s, %s).",
|
|
sc->sc_name,
|
|
g_mirror_device_state2str(sc->sc_state),
|
|
g_mirror_get_diskname(disk),
|
|
g_mirror_disk_state2str(disk->d_state)));
|
|
#endif
|
|
}
|
|
DISK_STATE_CHANGED();
|
|
G_MIRROR_DEBUG(0, "Device %s: provider %s disconnected.",
|
|
sc->sc_name, g_mirror_get_diskname(disk));
|
|
|
|
g_mirror_destroy_disk(disk);
|
|
break;
|
|
case G_MIRROR_DISK_STATE_DESTROY:
|
|
{
|
|
int error;
|
|
|
|
error = g_mirror_clear_metadata(disk);
|
|
if (error != 0) {
|
|
G_MIRROR_DEBUG(0,
|
|
"Device %s: failed to clear metadata on %s: %d.",
|
|
sc->sc_name, g_mirror_get_diskname(disk), error);
|
|
break;
|
|
}
|
|
DISK_STATE_CHANGED();
|
|
G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.",
|
|
sc->sc_name, g_mirror_get_diskname(disk));
|
|
|
|
g_mirror_destroy_disk(disk);
|
|
sc->sc_ndisks--;
|
|
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
|
|
g_mirror_update_metadata(disk);
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
KASSERT(1 == 0, ("Unknown state (%u).", state));
|
|
break;
|
|
}
|
|
return (0);
|
|
}
|
|
#undef DISK_STATE_CHANGED
|
|
|
|
int
|
|
g_mirror_read_metadata(struct g_consumer *cp, struct g_mirror_metadata *md)
|
|
{
|
|
struct g_provider *pp;
|
|
u_char *buf;
|
|
int error;
|
|
|
|
g_topology_assert();
|
|
|
|
error = g_access(cp, 1, 0, 0);
|
|
if (error != 0)
|
|
return (error);
|
|
pp = cp->provider;
|
|
g_topology_unlock();
|
|
/* Metadata are stored on last sector. */
|
|
buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
|
|
&error);
|
|
g_topology_lock();
|
|
g_access(cp, -1, 0, 0);
|
|
if (buf == NULL) {
|
|
G_MIRROR_DEBUG(1, "Cannot read metadata from %s (error=%d).",
|
|
cp->provider->name, error);
|
|
return (error);
|
|
}
|
|
|
|
/* Decode metadata. */
|
|
error = mirror_metadata_decode(buf, md);
|
|
g_free(buf);
|
|
if (strcmp(md->md_magic, G_MIRROR_MAGIC) != 0)
|
|
return (EINVAL);
|
|
if (md->md_version > G_MIRROR_VERSION) {
|
|
G_MIRROR_DEBUG(0,
|
|
"Kernel module is too old to handle metadata from %s.",
|
|
cp->provider->name);
|
|
return (EINVAL);
|
|
}
|
|
if (error != 0) {
|
|
G_MIRROR_DEBUG(1, "MD5 metadata hash mismatch for provider %s.",
|
|
cp->provider->name);
|
|
return (error);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
g_mirror_check_metadata(struct g_mirror_softc *sc, struct g_provider *pp,
|
|
struct g_mirror_metadata *md)
|
|
{
|
|
|
|
if (g_mirror_id2disk(sc, md->md_did) != NULL) {
|
|
G_MIRROR_DEBUG(1, "Disk %s (id=%u) already exists, skipping.",
|
|
pp->name, md->md_did);
|
|
return (EEXIST);
|
|
}
|
|
if (md->md_all != sc->sc_ndisks) {
|
|
G_MIRROR_DEBUG(1,
|
|
"Invalid '%s' field on disk %s (device %s), skipping.",
|
|
"md_all", pp->name, sc->sc_name);
|
|
return (EINVAL);
|
|
}
|
|
if (md->md_slice != sc->sc_slice) {
|
|
G_MIRROR_DEBUG(1,
|
|
"Invalid '%s' field on disk %s (device %s), skipping.",
|
|
"md_slice", pp->name, sc->sc_name);
|
|
return (EINVAL);
|
|
}
|
|
if (md->md_balance != sc->sc_balance) {
|
|
G_MIRROR_DEBUG(1,
|
|
"Invalid '%s' field on disk %s (device %s), skipping.",
|
|
"md_balance", pp->name, sc->sc_name);
|
|
return (EINVAL);
|
|
}
|
|
#if 0
|
|
if (md->md_mediasize != sc->sc_mediasize) {
|
|
G_MIRROR_DEBUG(1,
|
|
"Invalid '%s' field on disk %s (device %s), skipping.",
|
|
"md_mediasize", pp->name, sc->sc_name);
|
|
return (EINVAL);
|
|
}
|
|
#endif
|
|
if (sc->sc_mediasize > pp->mediasize) {
|
|
G_MIRROR_DEBUG(1,
|
|
"Invalid size of disk %s (device %s), skipping.", pp->name,
|
|
sc->sc_name);
|
|
return (EINVAL);
|
|
}
|
|
if (md->md_sectorsize != sc->sc_sectorsize) {
|
|
G_MIRROR_DEBUG(1,
|
|
"Invalid '%s' field on disk %s (device %s), skipping.",
|
|
"md_sectorsize", pp->name, sc->sc_name);
|
|
return (EINVAL);
|
|
}
|
|
if ((sc->sc_sectorsize % pp->sectorsize) != 0) {
|
|
G_MIRROR_DEBUG(1,
|
|
"Invalid sector size of disk %s (device %s), skipping.",
|
|
pp->name, sc->sc_name);
|
|
return (EINVAL);
|
|
}
|
|
if ((md->md_mflags & ~G_MIRROR_DEVICE_FLAG_MASK) != 0) {
|
|
G_MIRROR_DEBUG(1,
|
|
"Invalid device flags on disk %s (device %s), skipping.",
|
|
pp->name, sc->sc_name);
|
|
return (EINVAL);
|
|
}
|
|
if ((md->md_dflags & ~G_MIRROR_DISK_FLAG_MASK) != 0) {
|
|
G_MIRROR_DEBUG(1,
|
|
"Invalid disk flags on disk %s (device %s), skipping.",
|
|
pp->name, sc->sc_name);
|
|
return (EINVAL);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
g_mirror_add_disk(struct g_mirror_softc *sc, struct g_provider *pp,
|
|
struct g_mirror_metadata *md)
|
|
{
|
|
struct g_mirror_disk *disk;
|
|
int error;
|
|
|
|
g_topology_assert_not();
|
|
G_MIRROR_DEBUG(2, "Adding disk %s.", pp->name);
|
|
|
|
error = g_mirror_check_metadata(sc, pp, md);
|
|
if (error != 0)
|
|
return (error);
|
|
if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING &&
|
|
md->md_genid < sc->sc_genid) {
|
|
G_MIRROR_DEBUG(0, "Component %s (device %s) broken, skipping.",
|
|
pp->name, sc->sc_name);
|
|
return (EINVAL);
|
|
}
|
|
disk = g_mirror_init_disk(sc, pp, md, &error);
|
|
if (disk == NULL)
|
|
return (error);
|
|
error = g_mirror_event_send(disk, G_MIRROR_DISK_STATE_NEW,
|
|
G_MIRROR_EVENT_WAIT);
|
|
if (error != 0)
|
|
return (error);
|
|
if (md->md_version < G_MIRROR_VERSION) {
|
|
G_MIRROR_DEBUG(0, "Upgrading metadata on %s (v%d->v%d).",
|
|
pp->name, md->md_version, G_MIRROR_VERSION);
|
|
g_mirror_update_metadata(disk);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
g_mirror_destroy_delayed(void *arg, int flag)
|
|
{
|
|
struct g_mirror_softc *sc;
|
|
int error;
|
|
|
|
if (flag == EV_CANCEL) {
|
|
G_MIRROR_DEBUG(1, "Destroying canceled.");
|
|
return;
|
|
}
|
|
sc = arg;
|
|
g_topology_unlock();
|
|
sx_xlock(&sc->sc_lock);
|
|
KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) == 0,
|
|
("DESTROY flag set on %s.", sc->sc_name));
|
|
KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0,
|
|
("DESTROYING flag not set on %s.", sc->sc_name));
|
|
G_MIRROR_DEBUG(1, "Destroying %s (delayed).", sc->sc_name);
|
|
error = g_mirror_destroy(sc, G_MIRROR_DESTROY_SOFT);
|
|
if (error != 0) {
|
|
G_MIRROR_DEBUG(0, "Cannot destroy %s (error=%d).",
|
|
sc->sc_name, error);
|
|
sx_xunlock(&sc->sc_lock);
|
|
}
|
|
g_topology_lock();
|
|
}
|
|
|
|
static int
|
|
g_mirror_access(struct g_provider *pp, int acr, int acw, int ace)
|
|
{
|
|
struct g_mirror_softc *sc;
|
|
int error = 0;
|
|
|
|
g_topology_assert();
|
|
G_MIRROR_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, acr,
|
|
acw, ace);
|
|
|
|
sc = pp->private;
|
|
KASSERT(sc != NULL, ("NULL softc (provider=%s).", pp->name));
|
|
|
|
g_topology_unlock();
|
|
sx_xlock(&sc->sc_lock);
|
|
if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0 ||
|
|
(sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0 ||
|
|
LIST_EMPTY(&sc->sc_disks)) {
|
|
if (acr > 0 || acw > 0 || ace > 0)
|
|
error = ENXIO;
|
|
goto end;
|
|
}
|
|
sc->sc_provider_open += acr + acw + ace;
|
|
if (pp->acw + acw == 0)
|
|
g_mirror_idle(sc, 0);
|
|
if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0 &&
|
|
sc->sc_provider_open == 0)
|
|
g_post_event(g_mirror_destroy_delayed, sc, M_WAITOK, sc, NULL);
|
|
end:
|
|
sx_xunlock(&sc->sc_lock);
|
|
g_topology_lock();
|
|
return (error);
|
|
}
|
|
|
|
struct g_geom *
|
|
g_mirror_create(struct g_class *mp, const struct g_mirror_metadata *md,
|
|
u_int type)
|
|
{
|
|
struct g_mirror_softc *sc;
|
|
struct g_geom *gp;
|
|
int error, timeout;
|
|
|
|
g_topology_assert();
|
|
G_MIRROR_DEBUG(1, "Creating device %s (id=%u).", md->md_name,
|
|
md->md_mid);
|
|
|
|
/* One disk is minimum. */
|
|
if (md->md_all < 1)
|
|
return (NULL);
|
|
/*
|
|
* Action geom.
|
|
*/
|
|
gp = g_new_geomf(mp, "%s", md->md_name);
|
|
sc = malloc(sizeof(*sc), M_MIRROR, M_WAITOK | M_ZERO);
|
|
gp->start = g_mirror_start;
|
|
gp->orphan = g_mirror_orphan;
|
|
gp->access = g_mirror_access;
|
|
gp->dumpconf = g_mirror_dumpconf;
|
|
|
|
sc->sc_type = type;
|
|
sc->sc_id = md->md_mid;
|
|
sc->sc_slice = md->md_slice;
|
|
sc->sc_balance = md->md_balance;
|
|
sc->sc_mediasize = md->md_mediasize;
|
|
sc->sc_sectorsize = md->md_sectorsize;
|
|
sc->sc_ndisks = md->md_all;
|
|
sc->sc_flags = md->md_mflags;
|
|
sc->sc_bump_id = 0;
|
|
sc->sc_idle = 1;
|
|
sc->sc_last_write = time_uptime;
|
|
sc->sc_writes = 0;
|
|
sc->sc_refcnt = 1;
|
|
sx_init(&sc->sc_lock, "gmirror:lock");
|
|
bioq_init(&sc->sc_queue);
|
|
mtx_init(&sc->sc_queue_mtx, "gmirror:queue", NULL, MTX_DEF);
|
|
bioq_init(&sc->sc_regular_delayed);
|
|
bioq_init(&sc->sc_inflight);
|
|
bioq_init(&sc->sc_sync_delayed);
|
|
LIST_INIT(&sc->sc_disks);
|
|
TAILQ_INIT(&sc->sc_events);
|
|
mtx_init(&sc->sc_events_mtx, "gmirror:events", NULL, MTX_DEF);
|
|
callout_init(&sc->sc_callout, 1);
|
|
mtx_init(&sc->sc_done_mtx, "gmirror:done", NULL, MTX_DEF);
|
|
sc->sc_state = G_MIRROR_DEVICE_STATE_STARTING;
|
|
gp->softc = sc;
|
|
sc->sc_geom = gp;
|
|
sc->sc_provider = NULL;
|
|
sc->sc_provider_open = 0;
|
|
/*
|
|
* Synchronization geom.
|
|
*/
|
|
gp = g_new_geomf(mp, "%s.sync", md->md_name);
|
|
gp->softc = sc;
|
|
gp->orphan = g_mirror_orphan;
|
|
sc->sc_sync.ds_geom = gp;
|
|
sc->sc_sync.ds_ndisks = 0;
|
|
error = kproc_create(g_mirror_worker, sc, &sc->sc_worker, 0, 0,
|
|
"g_mirror %s", md->md_name);
|
|
if (error != 0) {
|
|
G_MIRROR_DEBUG(1, "Cannot create kernel thread for %s.",
|
|
sc->sc_name);
|
|
g_destroy_geom(sc->sc_sync.ds_geom);
|
|
g_destroy_geom(sc->sc_geom);
|
|
g_mirror_free_device(sc);
|
|
return (NULL);
|
|
}
|
|
|
|
G_MIRROR_DEBUG(1, "Device %s created (%u components, id=%u).",
|
|
sc->sc_name, sc->sc_ndisks, sc->sc_id);
|
|
|
|
sc->sc_rootmount = root_mount_hold("GMIRROR");
|
|
G_MIRROR_DEBUG(1, "root_mount_hold %p", sc->sc_rootmount);
|
|
/*
|
|
* Run timeout.
|
|
*/
|
|
timeout = g_mirror_timeout * hz;
|
|
callout_reset(&sc->sc_callout, timeout, g_mirror_go, sc);
|
|
return (sc->sc_geom);
|
|
}
|
|
|
|
int
|
|
g_mirror_destroy(struct g_mirror_softc *sc, int how)
|
|
{
|
|
struct g_mirror_disk *disk;
|
|
|
|
g_topology_assert_not();
|
|
sx_assert(&sc->sc_lock, SX_XLOCKED);
|
|
|
|
if (sc->sc_provider_open != 0 || SCHEDULER_STOPPED()) {
|
|
switch (how) {
|
|
case G_MIRROR_DESTROY_SOFT:
|
|
G_MIRROR_DEBUG(1,
|
|
"Device %s is still open (%d).", sc->sc_name,
|
|
sc->sc_provider_open);
|
|
return (EBUSY);
|
|
case G_MIRROR_DESTROY_DELAYED:
|
|
G_MIRROR_DEBUG(1,
|
|
"Device %s will be destroyed on last close.",
|
|
sc->sc_name);
|
|
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
|
|
if (disk->d_state ==
|
|
G_MIRROR_DISK_STATE_SYNCHRONIZING) {
|
|
g_mirror_sync_stop(disk, 1);
|
|
}
|
|
}
|
|
sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROYING;
|
|
return (EBUSY);
|
|
case G_MIRROR_DESTROY_HARD:
|
|
G_MIRROR_DEBUG(1, "Device %s is still open, so it "
|
|
"can't be definitely removed.", sc->sc_name);
|
|
}
|
|
}
|
|
|
|
g_topology_lock();
|
|
if (sc->sc_geom->softc == NULL) {
|
|
g_topology_unlock();
|
|
return (0);
|
|
}
|
|
sc->sc_geom->softc = NULL;
|
|
sc->sc_sync.ds_geom->softc = NULL;
|
|
g_topology_unlock();
|
|
|
|
sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY;
|
|
sc->sc_flags |= G_MIRROR_DEVICE_FLAG_WAIT;
|
|
G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc);
|
|
sx_xunlock(&sc->sc_lock);
|
|
mtx_lock(&sc->sc_queue_mtx);
|
|
wakeup(sc);
|
|
mtx_unlock(&sc->sc_queue_mtx);
|
|
G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, &sc->sc_worker);
|
|
while (sc->sc_worker != NULL)
|
|
tsleep(&sc->sc_worker, PRIBIO, "m:destroy", hz / 5);
|
|
G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, &sc->sc_worker);
|
|
sx_xlock(&sc->sc_lock);
|
|
g_mirror_destroy_device(sc);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
g_mirror_taste_orphan(struct g_consumer *cp)
|
|
{
|
|
|
|
KASSERT(1 == 0, ("%s called while tasting %s.", __func__,
|
|
cp->provider->name));
|
|
}
|
|
|
|
static struct g_geom *
|
|
g_mirror_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
|
|
{
|
|
struct g_mirror_metadata md;
|
|
struct g_mirror_softc *sc;
|
|
struct g_consumer *cp;
|
|
struct g_geom *gp;
|
|
int error;
|
|
|
|
g_topology_assert();
|
|
g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
|
|
G_MIRROR_DEBUG(2, "Tasting %s.", pp->name);
|
|
|
|
gp = g_new_geomf(mp, "mirror:taste");
|
|
/*
|
|
* This orphan function should be never called.
|
|
*/
|
|
gp->orphan = g_mirror_taste_orphan;
|
|
cp = g_new_consumer(gp);
|
|
g_attach(cp, pp);
|
|
error = g_mirror_read_metadata(cp, &md);
|
|
g_detach(cp);
|
|
g_destroy_consumer(cp);
|
|
g_destroy_geom(gp);
|
|
if (error != 0)
|
|
return (NULL);
|
|
gp = NULL;
|
|
|
|
if (md.md_provider[0] != '\0' &&
|
|
!g_compare_names(md.md_provider, pp->name))
|
|
return (NULL);
|
|
if (md.md_provsize != 0 && md.md_provsize != pp->mediasize)
|
|
return (NULL);
|
|
if ((md.md_dflags & G_MIRROR_DISK_FLAG_INACTIVE) != 0) {
|
|
G_MIRROR_DEBUG(0,
|
|
"Device %s: provider %s marked as inactive, skipping.",
|
|
md.md_name, pp->name);
|
|
return (NULL);
|
|
}
|
|
if (g_mirror_debug >= 2)
|
|
mirror_metadata_dump(&md);
|
|
|
|
/*
|
|
* Let's check if device already exists.
|
|
*/
|
|
sc = NULL;
|
|
LIST_FOREACH(gp, &mp->geom, geom) {
|
|
sc = gp->softc;
|
|
if (sc == NULL)
|
|
continue;
|
|
if (sc->sc_type != G_MIRROR_TYPE_AUTOMATIC)
|
|
continue;
|
|
if (sc->sc_sync.ds_geom == gp)
|
|
continue;
|
|
if (strcmp(md.md_name, sc->sc_name) != 0)
|
|
continue;
|
|
if (md.md_mid != sc->sc_id) {
|
|
G_MIRROR_DEBUG(0, "Device %s already configured.",
|
|
sc->sc_name);
|
|
return (NULL);
|
|
}
|
|
break;
|
|
}
|
|
if (gp == NULL) {
|
|
gp = g_mirror_create(mp, &md, G_MIRROR_TYPE_AUTOMATIC);
|
|
if (gp == NULL) {
|
|
G_MIRROR_DEBUG(0, "Cannot create device %s.",
|
|
md.md_name);
|
|
return (NULL);
|
|
}
|
|
sc = gp->softc;
|
|
}
|
|
G_MIRROR_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name);
|
|
g_topology_unlock();
|
|
sx_xlock(&sc->sc_lock);
|
|
sc->sc_flags |= G_MIRROR_DEVICE_FLAG_TASTING;
|
|
error = g_mirror_add_disk(sc, pp, &md);
|
|
if (error != 0) {
|
|
G_MIRROR_DEBUG(0, "Cannot add disk %s to %s (error=%d).",
|
|
pp->name, gp->name, error);
|
|
if (LIST_EMPTY(&sc->sc_disks)) {
|
|
g_cancel_event(sc);
|
|
g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD);
|
|
g_topology_lock();
|
|
return (NULL);
|
|
}
|
|
gp = NULL;
|
|
}
|
|
sc->sc_flags &= ~G_MIRROR_DEVICE_FLAG_TASTING;
|
|
if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) {
|
|
g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD);
|
|
g_topology_lock();
|
|
return (NULL);
|
|
}
|
|
sx_xunlock(&sc->sc_lock);
|
|
g_topology_lock();
|
|
return (gp);
|
|
}
|
|
|
|
static void
|
|
g_mirror_resize(struct g_consumer *cp)
|
|
{
|
|
struct g_mirror_disk *disk;
|
|
|
|
g_topology_assert();
|
|
g_trace(G_T_TOPOLOGY, "%s(%s)", __func__, cp->provider->name);
|
|
|
|
disk = cp->private;
|
|
if (disk == NULL)
|
|
return;
|
|
g_topology_unlock();
|
|
g_mirror_update_metadata(disk);
|
|
g_topology_lock();
|
|
}
|
|
|
|
static int
|
|
g_mirror_destroy_geom(struct gctl_req *req __unused,
|
|
struct g_class *mp __unused, struct g_geom *gp)
|
|
{
|
|
struct g_mirror_softc *sc;
|
|
int error;
|
|
|
|
g_topology_unlock();
|
|
sc = gp->softc;
|
|
sx_xlock(&sc->sc_lock);
|
|
g_cancel_event(sc);
|
|
error = g_mirror_destroy(gp->softc, G_MIRROR_DESTROY_SOFT);
|
|
if (error != 0)
|
|
sx_xunlock(&sc->sc_lock);
|
|
g_topology_lock();
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
g_mirror_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
|
|
struct g_consumer *cp, struct g_provider *pp)
|
|
{
|
|
struct g_mirror_softc *sc;
|
|
|
|
g_topology_assert();
|
|
|
|
sc = gp->softc;
|
|
if (sc == NULL)
|
|
return;
|
|
/* Skip synchronization geom. */
|
|
if (gp == sc->sc_sync.ds_geom)
|
|
return;
|
|
if (pp != NULL) {
|
|
/* Nothing here. */
|
|
} else if (cp != NULL) {
|
|
struct g_mirror_disk *disk;
|
|
|
|
disk = cp->private;
|
|
if (disk == NULL)
|
|
return;
|
|
g_topology_unlock();
|
|
sx_xlock(&sc->sc_lock);
|
|
sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)disk->d_id);
|
|
if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) {
|
|
sbuf_printf(sb, "%s<Synchronized>", indent);
|
|
if (disk->d_sync.ds_offset == 0)
|
|
sbuf_printf(sb, "0%%");
|
|
else {
|
|
sbuf_printf(sb, "%u%%",
|
|
(u_int)((disk->d_sync.ds_offset * 100) /
|
|
sc->sc_provider->mediasize));
|
|
}
|
|
sbuf_printf(sb, "</Synchronized>\n");
|
|
if (disk->d_sync.ds_offset > 0) {
|
|
sbuf_printf(sb, "%s<BytesSynced>%jd"
|
|
"</BytesSynced>\n", indent,
|
|
(intmax_t)disk->d_sync.ds_offset);
|
|
}
|
|
}
|
|
sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent,
|
|
disk->d_sync.ds_syncid);
|
|
sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent,
|
|
disk->d_genid);
|
|
sbuf_printf(sb, "%s<Flags>", indent);
|
|
if (disk->d_flags == 0)
|
|
sbuf_printf(sb, "NONE");
|
|
else {
|
|
int first = 1;
|
|
|
|
#define ADD_FLAG(flag, name) do { \
|
|
if ((disk->d_flags & (flag)) != 0) { \
|
|
if (!first) \
|
|
sbuf_printf(sb, ", "); \
|
|
else \
|
|
first = 0; \
|
|
sbuf_printf(sb, name); \
|
|
} \
|
|
} while (0)
|
|
ADD_FLAG(G_MIRROR_DISK_FLAG_DIRTY, "DIRTY");
|
|
ADD_FLAG(G_MIRROR_DISK_FLAG_HARDCODED, "HARDCODED");
|
|
ADD_FLAG(G_MIRROR_DISK_FLAG_INACTIVE, "INACTIVE");
|
|
ADD_FLAG(G_MIRROR_DISK_FLAG_SYNCHRONIZING,
|
|
"SYNCHRONIZING");
|
|
ADD_FLAG(G_MIRROR_DISK_FLAG_FORCE_SYNC, "FORCE_SYNC");
|
|
ADD_FLAG(G_MIRROR_DISK_FLAG_BROKEN, "BROKEN");
|
|
#undef ADD_FLAG
|
|
}
|
|
sbuf_printf(sb, "</Flags>\n");
|
|
sbuf_printf(sb, "%s<Priority>%u</Priority>\n", indent,
|
|
disk->d_priority);
|
|
sbuf_printf(sb, "%s<State>%s</State>\n", indent,
|
|
g_mirror_disk_state2str(disk->d_state));
|
|
sx_xunlock(&sc->sc_lock);
|
|
g_topology_lock();
|
|
} else {
|
|
g_topology_unlock();
|
|
sx_xlock(&sc->sc_lock);
|
|
sbuf_printf(sb, "%s<Type>", indent);
|
|
switch (sc->sc_type) {
|
|
case G_MIRROR_TYPE_AUTOMATIC:
|
|
sbuf_printf(sb, "AUTOMATIC");
|
|
break;
|
|
case G_MIRROR_TYPE_MANUAL:
|
|
sbuf_printf(sb, "MANUAL");
|
|
break;
|
|
default:
|
|
sbuf_printf(sb, "UNKNOWN");
|
|
break;
|
|
}
|
|
sbuf_printf(sb, "</Type>\n");
|
|
sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id);
|
|
sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, sc->sc_syncid);
|
|
sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, sc->sc_genid);
|
|
sbuf_printf(sb, "%s<Flags>", indent);
|
|
if (sc->sc_flags == 0)
|
|
sbuf_printf(sb, "NONE");
|
|
else {
|
|
int first = 1;
|
|
|
|
#define ADD_FLAG(flag, name) do { \
|
|
if ((sc->sc_flags & (flag)) != 0) { \
|
|
if (!first) \
|
|
sbuf_printf(sb, ", "); \
|
|
else \
|
|
first = 0; \
|
|
sbuf_printf(sb, name); \
|
|
} \
|
|
} while (0)
|
|
ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOFAILSYNC, "NOFAILSYNC");
|
|
ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOAUTOSYNC, "NOAUTOSYNC");
|
|
#undef ADD_FLAG
|
|
}
|
|
sbuf_printf(sb, "</Flags>\n");
|
|
sbuf_printf(sb, "%s<Slice>%u</Slice>\n", indent,
|
|
(u_int)sc->sc_slice);
|
|
sbuf_printf(sb, "%s<Balance>%s</Balance>\n", indent,
|
|
balance_name(sc->sc_balance));
|
|
sbuf_printf(sb, "%s<Components>%u</Components>\n", indent,
|
|
sc->sc_ndisks);
|
|
sbuf_printf(sb, "%s<State>", indent);
|
|
if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING)
|
|
sbuf_printf(sb, "%s", "STARTING");
|
|
else if (sc->sc_ndisks ==
|
|
g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE))
|
|
sbuf_printf(sb, "%s", "COMPLETE");
|
|
else
|
|
sbuf_printf(sb, "%s", "DEGRADED");
|
|
sbuf_printf(sb, "</State>\n");
|
|
sx_xunlock(&sc->sc_lock);
|
|
g_topology_lock();
|
|
}
|
|
}
|
|
|
|
static void
|
|
g_mirror_shutdown_post_sync(void *arg, int howto)
|
|
{
|
|
struct g_class *mp;
|
|
struct g_geom *gp, *gp2;
|
|
struct g_mirror_softc *sc;
|
|
int error;
|
|
|
|
mp = arg;
|
|
g_topology_lock();
|
|
g_mirror_shutdown = 1;
|
|
LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) {
|
|
if ((sc = gp->softc) == NULL)
|
|
continue;
|
|
/* Skip synchronization geom. */
|
|
if (gp == sc->sc_sync.ds_geom)
|
|
continue;
|
|
g_topology_unlock();
|
|
sx_xlock(&sc->sc_lock);
|
|
g_mirror_idle(sc, -1);
|
|
g_cancel_event(sc);
|
|
error = g_mirror_destroy(sc, G_MIRROR_DESTROY_DELAYED);
|
|
if (error != 0)
|
|
sx_xunlock(&sc->sc_lock);
|
|
g_topology_lock();
|
|
}
|
|
g_topology_unlock();
|
|
}
|
|
|
|
static void
|
|
g_mirror_init(struct g_class *mp)
|
|
{
|
|
|
|
g_mirror_post_sync = EVENTHANDLER_REGISTER(shutdown_post_sync,
|
|
g_mirror_shutdown_post_sync, mp, SHUTDOWN_PRI_FIRST);
|
|
if (g_mirror_post_sync == NULL)
|
|
G_MIRROR_DEBUG(0, "Warning! Cannot register shutdown event.");
|
|
}
|
|
|
|
static void
|
|
g_mirror_fini(struct g_class *mp)
|
|
{
|
|
|
|
if (g_mirror_post_sync != NULL)
|
|
EVENTHANDLER_DEREGISTER(shutdown_post_sync, g_mirror_post_sync);
|
|
}
|
|
|
|
DECLARE_GEOM_CLASS(g_mirror_class, g_mirror);
|