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freebsd-dev/sys/geom/mirror/g_mirror.c
Pawel Jakub Dawidek 0218292cdf Update copyright in files changed this year.
2005-02-16 22:14:52 +00:00

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/*-
* Copyright (c) 2004-2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/limits.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/bio.h>
#include <sys/sysctl.h>
#include <sys/malloc.h>
#include <sys/eventhandler.h>
#include <vm/uma.h>
#include <geom/geom.h>
#include <sys/proc.h>
#include <sys/kthread.h>
#include <sys/sched.h>
#include <geom/mirror/g_mirror.h>
static MALLOC_DEFINE(M_MIRROR, "mirror data", "GEOM_MIRROR Data");
SYSCTL_DECL(_kern_geom);
SYSCTL_NODE(_kern_geom, OID_AUTO, mirror, CTLFLAG_RW, 0, "GEOM_MIRROR stuff");
u_int g_mirror_debug = 0;
TUNABLE_INT("kern.geom.mirror.debug", &g_mirror_debug);
SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, debug, CTLFLAG_RW, &g_mirror_debug, 0,
"Debug level");
static u_int g_mirror_timeout = 4;
TUNABLE_INT("kern.geom.mirror.timeout", &g_mirror_timeout);
SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, timeout, CTLFLAG_RW, &g_mirror_timeout,
0, "Time to wait on all mirror components");
static u_int g_mirror_idletime = 5;
TUNABLE_INT("kern.geom.mirror.idletime", &g_mirror_idletime);
SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, idletime, CTLFLAG_RW,
&g_mirror_idletime, 0, "Mark components as clean when idling");
static u_int g_mirror_reqs_per_sync = 5;
SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, reqs_per_sync, CTLFLAG_RW,
&g_mirror_reqs_per_sync, 0,
"Number of regular I/O requests per synchronization request");
static u_int g_mirror_syncs_per_sec = 1000;
SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, syncs_per_sec, CTLFLAG_RW,
&g_mirror_syncs_per_sec, 0,
"Number of synchronizations requests per second");
#define MSLEEP(ident, mtx, priority, wmesg, timeout) do { \
G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, (ident)); \
msleep((ident), (mtx), (priority), (wmesg), (timeout)); \
G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, (ident)); \
} while (0)
static eventhandler_tag g_mirror_ehtag = NULL;
static int g_mirror_destroy_geom(struct gctl_req *req, struct g_class *mp,
struct g_geom *gp);
static g_taste_t g_mirror_taste;
static void g_mirror_init(struct g_class *mp);
static void g_mirror_fini(struct g_class *mp);
struct g_class g_mirror_class = {
.name = G_MIRROR_CLASS_NAME,
.version = G_VERSION,
.ctlreq = g_mirror_config,
.taste = g_mirror_taste,
.destroy_geom = g_mirror_destroy_geom,
.init = g_mirror_init,
.fini = g_mirror_fini
};
static void g_mirror_destroy_provider(struct g_mirror_softc *sc);
static int g_mirror_update_disk(struct g_mirror_disk *disk, u_int state);
static void g_mirror_update_device(struct g_mirror_softc *sc, boolean_t force);
static void g_mirror_dumpconf(struct sbuf *sb, const char *indent,
struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp);
static void g_mirror_sync_stop(struct g_mirror_disk *disk, int type);
static const char *
g_mirror_disk_state2str(int state)
{
switch (state) {
case G_MIRROR_DISK_STATE_NONE:
return ("NONE");
case G_MIRROR_DISK_STATE_NEW:
return ("NEW");
case G_MIRROR_DISK_STATE_ACTIVE:
return ("ACTIVE");
case G_MIRROR_DISK_STATE_STALE:
return ("STALE");
case G_MIRROR_DISK_STATE_SYNCHRONIZING:
return ("SYNCHRONIZING");
case G_MIRROR_DISK_STATE_DISCONNECTED:
return ("DISCONNECTED");
case G_MIRROR_DISK_STATE_DESTROY:
return ("DESTROY");
default:
return ("INVALID");
}
}
static const char *
g_mirror_device_state2str(int state)
{
switch (state) {
case G_MIRROR_DEVICE_STATE_STARTING:
return ("STARTING");
case G_MIRROR_DEVICE_STATE_RUNNING:
return ("RUNNING");
default:
return ("INVALID");
}
}
static const char *
g_mirror_get_diskname(struct g_mirror_disk *disk)
{
if (disk->d_consumer == NULL || disk->d_consumer->provider == NULL)
return ("[unknown]");
return (disk->d_name);
}
/*
* --- Events handling functions ---
* Events in geom_mirror are used to maintain disks and device status
* from one thread to simplify locking.
*/
static void
g_mirror_event_free(struct g_mirror_event *ep)
{
free(ep, M_MIRROR);
}
int
g_mirror_event_send(void *arg, int state, int flags)
{
struct g_mirror_softc *sc;
struct g_mirror_disk *disk;
struct g_mirror_event *ep;
int error;
ep = malloc(sizeof(*ep), M_MIRROR, M_WAITOK);
G_MIRROR_DEBUG(4, "%s: Sending event %p.", __func__, ep);
if ((flags & G_MIRROR_EVENT_DEVICE) != 0) {
disk = NULL;
sc = arg;
} else {
disk = arg;
sc = disk->d_softc;
}
ep->e_disk = disk;
ep->e_state = state;
ep->e_flags = flags;
ep->e_error = 0;
mtx_lock(&sc->sc_events_mtx);
TAILQ_INSERT_TAIL(&sc->sc_events, ep, e_next);
mtx_unlock(&sc->sc_events_mtx);
G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc);
mtx_lock(&sc->sc_queue_mtx);
wakeup(sc);
mtx_unlock(&sc->sc_queue_mtx);
if ((flags & G_MIRROR_EVENT_DONTWAIT) != 0)
return (0);
g_topology_assert();
G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, ep);
g_topology_unlock();
while ((ep->e_flags & G_MIRROR_EVENT_DONE) == 0) {
mtx_lock(&sc->sc_events_mtx);
MSLEEP(ep, &sc->sc_events_mtx, PRIBIO | PDROP, "m:event",
hz * 5);
}
/* Don't even try to use 'sc' here, because it could be already dead. */
g_topology_lock();
error = ep->e_error;
g_mirror_event_free(ep);
return (error);
}
static struct g_mirror_event *
g_mirror_event_get(struct g_mirror_softc *sc)
{
struct g_mirror_event *ep;
mtx_lock(&sc->sc_events_mtx);
ep = TAILQ_FIRST(&sc->sc_events);
mtx_unlock(&sc->sc_events_mtx);
return (ep);
}
static void
g_mirror_event_remove(struct g_mirror_softc *sc, struct g_mirror_event *ep)
{
mtx_lock(&sc->sc_events_mtx);
TAILQ_REMOVE(&sc->sc_events, ep, e_next);
mtx_unlock(&sc->sc_events_mtx);
}
static void
g_mirror_event_cancel(struct g_mirror_disk *disk)
{
struct g_mirror_softc *sc;
struct g_mirror_event *ep, *tmpep;
g_topology_assert();
sc = disk->d_softc;
mtx_lock(&sc->sc_events_mtx);
TAILQ_FOREACH_SAFE(ep, &sc->sc_events, e_next, tmpep) {
if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0)
continue;
if (ep->e_disk != disk)
continue;
TAILQ_REMOVE(&sc->sc_events, ep, e_next);
if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0)
g_mirror_event_free(ep);
else {
ep->e_error = ECANCELED;
wakeup(ep);
}
}
mtx_unlock(&sc->sc_events_mtx);
}
/*
* Return the number of disks in given state.
* If state is equal to -1, count all connected disks.
*/
u_int
g_mirror_ndisks(struct g_mirror_softc *sc, int state)
{
struct g_mirror_disk *disk;
u_int n = 0;
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
if (state == -1 || disk->d_state == state)
n++;
}
return (n);
}
/*
* Find a disk in mirror by its disk ID.
*/
static struct g_mirror_disk *
g_mirror_id2disk(struct g_mirror_softc *sc, uint32_t id)
{
struct g_mirror_disk *disk;
g_topology_assert();
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
if (disk->d_id == id)
return (disk);
}
return (NULL);
}
static u_int
g_mirror_nrequests(struct g_mirror_softc *sc, struct g_consumer *cp)
{
struct bio *bp;
u_int nreqs = 0;
mtx_lock(&sc->sc_queue_mtx);
TAILQ_FOREACH(bp, &sc->sc_queue.queue, bio_queue) {
if (bp->bio_from == cp)
nreqs++;
}
mtx_unlock(&sc->sc_queue_mtx);
return (nreqs);
}
static int
g_mirror_is_busy(struct g_mirror_softc *sc, struct g_consumer *cp)
{
if (cp->index > 0) {
G_MIRROR_DEBUG(2,
"I/O requests for %s exist, can't destroy it now.",
cp->provider->name);
return (1);
}
if (g_mirror_nrequests(sc, cp) > 0) {
G_MIRROR_DEBUG(2,
"I/O requests for %s in queue, can't destroy it now.",
cp->provider->name);
return (1);
}
return (0);
}
static void
g_mirror_destroy_consumer(void *arg, int flags __unused)
{
struct g_consumer *cp;
cp = arg;
G_MIRROR_DEBUG(1, "Consumer %s destroyed.", cp->provider->name);
g_detach(cp);
g_destroy_consumer(cp);
}
static void
g_mirror_kill_consumer(struct g_mirror_softc *sc, struct g_consumer *cp)
{
struct g_provider *pp;
int retaste_wait;
g_topology_assert();
cp->private = NULL;
if (g_mirror_is_busy(sc, cp))
return;
pp = cp->provider;
retaste_wait = 0;
if (cp->acw == 1) {
if ((pp->geom->flags & G_GEOM_WITHER) == 0)
retaste_wait = 1;
}
G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", pp->name, -cp->acr,
-cp->acw, -cp->ace, 0);
if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
g_access(cp, -cp->acr, -cp->acw, -cp->ace);
if (retaste_wait) {
/*
* After retaste event was send (inside g_access()), we can send
* event to detach and destroy consumer.
* A class, which has consumer to the given provider connected
* will not receive retaste event for the provider.
* This is the way how I ignore retaste events when I close
* consumers opened for write: I detach and destroy consumer
* after retaste event is sent.
*/
g_post_event(g_mirror_destroy_consumer, cp, M_WAITOK, NULL);
return;
}
G_MIRROR_DEBUG(1, "Consumer %s destroyed.", pp->name);
g_detach(cp);
g_destroy_consumer(cp);
}
static int
g_mirror_connect_disk(struct g_mirror_disk *disk, struct g_provider *pp)
{
int error;
g_topology_assert();
KASSERT(disk->d_consumer == NULL,
("Disk already connected (device %s).", disk->d_softc->sc_name));
disk->d_consumer = g_new_consumer(disk->d_softc->sc_geom);
disk->d_consumer->private = disk;
disk->d_consumer->index = 0;
error = g_attach(disk->d_consumer, pp);
if (error != 0)
return (error);
error = g_access(disk->d_consumer, 1, 1, 1);
if (error != 0) {
G_MIRROR_DEBUG(0, "Cannot open consumer %s (error=%d).",
pp->name, error);
return (error);
}
G_MIRROR_DEBUG(2, "Disk %s connected.", g_mirror_get_diskname(disk));
return (0);
}
static void
g_mirror_disconnect_consumer(struct g_mirror_softc *sc, struct g_consumer *cp)
{
g_topology_assert();
if (cp == NULL)
return;
if (cp->provider != NULL)
g_mirror_kill_consumer(sc, cp);
else
g_destroy_consumer(cp);
}
/*
* Initialize disk. This means allocate memory, create consumer, attach it
* to the provider and open access (r1w1e1) to it.
*/
static struct g_mirror_disk *
g_mirror_init_disk(struct g_mirror_softc *sc, struct g_provider *pp,
struct g_mirror_metadata *md, int *errorp)
{
struct g_mirror_disk *disk;
int error;
disk = malloc(sizeof(*disk), M_MIRROR, M_NOWAIT | M_ZERO);
if (disk == NULL) {
error = ENOMEM;
goto fail;
}
disk->d_softc = sc;
error = g_mirror_connect_disk(disk, pp);
if (error != 0)
goto fail;
disk->d_id = md->md_did;
disk->d_state = G_MIRROR_DISK_STATE_NONE;
disk->d_priority = md->md_priority;
disk->d_delay.sec = 0;
disk->d_delay.frac = 0;
binuptime(&disk->d_last_used);
disk->d_flags = md->md_dflags;
if (md->md_provider[0] != '\0')
disk->d_flags |= G_MIRROR_DISK_FLAG_HARDCODED;
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_sync.ds_resync = -1;
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) {
g_mirror_disconnect_consumer(sc, disk->d_consumer);
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();
LIST_REMOVE(disk, d_next);
g_mirror_event_cancel(disk);
sc = disk->d_softc;
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_mirror_disconnect_consumer(sc, disk->d_consumer);
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_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();
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);
gp->softc = NULL;
LIST_FOREACH_SAFE(cp, &sc->sc_sync.ds_geom->consumer, consumer, tmpcp) {
g_mirror_disconnect_consumer(sc, cp);
}
sc->sc_sync.ds_geom->softc = NULL;
g_wither_geom(sc->sc_sync.ds_geom, ENXIO);
mtx_destroy(&sc->sc_queue_mtx);
mtx_destroy(&sc->sc_events_mtx);
G_MIRROR_DEBUG(0, "Device %s destroyed.", gp->name);
g_wither_geom(gp, ENXIO);
}
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();
sc = disk->d_softc;
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)
mirror_metadata_encode(md, sector);
g_topology_unlock();
error = g_write_data(cp, offset, sector, length);
g_topology_lock();
free(sector, M_MIRROR);
if (error != 0) {
disk->d_softc->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();
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;
} 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));
}
}
}
void
g_mirror_update_metadata(struct g_mirror_disk *disk)
{
struct g_mirror_metadata md;
int error;
g_topology_assert();
g_mirror_fill_metadata(disk->d_softc, 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();
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();
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 void
g_mirror_idle(struct g_mirror_softc *sc)
{
struct g_mirror_disk *disk;
if (sc->sc_provider == NULL || sc->sc_provider->acw == 0)
return;
sc->sc_idle = 1;
g_topology_lock();
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE)
continue;
G_MIRROR_DEBUG(1, "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);
}
g_topology_unlock();
}
static void
g_mirror_unidle(struct g_mirror_softc *sc)
{
struct g_mirror_disk *disk;
sc->sc_idle = 0;
g_topology_lock();
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE)
continue;
G_MIRROR_DEBUG(1, "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);
}
g_topology_unlock();
}
/*
* Return 1 if we should check if mirror is idling.
*/
static int
g_mirror_check_idle(struct g_mirror_softc *sc)
{
struct g_mirror_disk *disk;
if (sc->sc_idle)
return (0);
if (sc->sc_provider != NULL && sc->sc_provider->acw == 0)
return (0);
/*
* Check if there are no in-flight requests.
*/
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE)
continue;
if (disk->d_consumer->index > 0)
return (0);
}
return (1);
}
static __inline int
bintime_cmp(struct bintime *bt1, struct bintime *bt2)
{
if (bt1->sec < bt2->sec)
return (-1);
else if (bt1->sec > bt2->sec)
return (1);
if (bt1->frac < bt2->frac)
return (-1);
else if (bt1->frac > bt2->frac)
return (1);
return (0);
}
static void
g_mirror_update_delay(struct g_mirror_disk *disk, struct bio *bp)
{
if (disk->d_softc->sc_balance != G_MIRROR_BALANCE_LOAD)
return;
binuptime(&disk->d_delay);
bintime_sub(&disk->d_delay, &bp->bio_t0);
}
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_disksort(&sc->sc_queue, bp);
wakeup(sc);
mtx_unlock(&sc->sc_queue_mtx);
}
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();
bp->bio_from->index--;
pbp = bp->bio_parent;
sc = pbp->bio_to->geom->softc;
disk = bp->bio_from->private;
if (disk == NULL) {
g_topology_lock();
g_mirror_kill_consumer(sc, bp->bio_from);
g_topology_unlock();
} else {
g_mirror_update_delay(disk, bp);
}
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;
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;
G_MIRROR_LOGREQ(0, bp, "Request failed (error=%d).",
bp->bio_error);
if (disk != NULL) {
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_children == pbp->bio_inbed) {
pbp->bio_error = 0;
mtx_lock(&sc->sc_queue_mtx);
bioq_disksort(&sc->sc_queue, pbp);
G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc);
wakeup(sc);
mtx_unlock(&sc->sc_queue_mtx);
}
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;
}
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_disksort(&sc->sc_queue, bp);
wakeup(sc);
mtx_unlock(&sc->sc_queue_mtx);
}
static void
g_mirror_start(struct bio *bp)
{
struct g_mirror_softc *sc;
sc = bp->bio_to->geom->softc;
/*
* 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_GETATTR:
default:
g_io_deliver(bp, EOPNOTSUPP);
return;
}
mtx_lock(&sc->sc_queue_mtx);
bioq_disksort(&sc->sc_queue, bp);
G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc);
wakeup(sc);
mtx_unlock(&sc->sc_queue_mtx);
}
/*
* Send one synchronization request.
*/
static void
g_mirror_sync_one(struct g_mirror_disk *disk)
{
struct g_mirror_softc *sc;
struct bio *bp;
sc = disk->d_softc;
KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING,
("Disk %s is not marked for synchronization.",
g_mirror_get_diskname(disk)));
bp = g_new_bio();
if (bp == NULL)
return;
bp->bio_parent = NULL;
bp->bio_cmd = BIO_READ;
bp->bio_offset = disk->d_sync.ds_offset;
bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset);
bp->bio_cflags = 0;
bp->bio_done = g_mirror_sync_done;
bp->bio_data = disk->d_sync.ds_data;
if (bp->bio_data == NULL) {
g_destroy_bio(bp);
return;
}
disk->d_sync.ds_offset += bp->bio_length;
bp->bio_to = sc->sc_provider;
G_MIRROR_LOGREQ(3, bp, "Sending synchronization request.");
disk->d_sync.ds_consumer->index++;
g_io_request(bp, disk->d_sync.ds_consumer);
}
static void
g_mirror_sync_request(struct bio *bp)
{
struct g_mirror_softc *sc;
struct g_mirror_disk *disk;
bp->bio_from->index--;
sc = bp->bio_from->geom->softc;
disk = bp->bio_from->private;
if (disk == NULL) {
g_topology_lock();
g_mirror_kill_consumer(sc, bp->bio_from);
g_topology_unlock();
g_destroy_bio(bp);
return;
}
/*
* Synchronization request.
*/
switch (bp->bio_cmd) {
case BIO_READ:
{
struct g_consumer *cp;
if (bp->bio_error != 0) {
G_MIRROR_LOGREQ(0, bp,
"Synchronization request failed (error=%d).",
bp->bio_error);
g_destroy_bio(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:
{
struct g_mirror_disk_sync *sync;
if (bp->bio_error != 0) {
G_MIRROR_LOGREQ(0, bp,
"Synchronization request failed (error=%d).",
bp->bio_error);
g_destroy_bio(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;
sync->ds_offset_done = bp->bio_offset + bp->bio_length;
g_destroy_bio(bp);
if (sync->ds_resync != -1)
break;
if (sync->ds_offset_done == sc->sc_provider->mediasize) {
/*
* Disk up-to-date, activate it.
*/
g_mirror_event_send(disk, G_MIRROR_DISK_STATE_ACTIVE,
G_MIRROR_EVENT_DONTWAIT);
return;
} else if (sync->ds_offset_done % (MAXPHYS * 100) == 0) {
/*
* Update offset_done on every 100 blocks.
* XXX: This should be configurable.
*/
g_topology_lock();
g_mirror_update_metadata(disk);
g_topology_unlock();
}
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);
}
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;
struct bintime curtime;
binuptime(&curtime);
/*
* Find a disk which the smallest load.
*/
disk = NULL;
LIST_FOREACH(dp, &sc->sc_disks, d_next) {
if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE)
continue;
/* If disk wasn't used for more than 2 sec, use it. */
if (curtime.sec - dp->d_last_used.sec >= 2) {
disk = dp;
break;
}
if (disk == NULL ||
bintime_cmp(&dp->d_delay, &disk->d_delay) < 0) {
disk = dp;
}
}
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;
binuptime(&disk->d_last_used);
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_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) {
for (cbp = bioq_first(&queue); cbp != NULL;
cbp = bioq_first(&queue)) {
bioq_remove(&queue, cbp);
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;
}
for (cbp = bioq_first(&queue); cbp != NULL; cbp = bioq_first(&queue)) {
bioq_remove(&queue, cbp);
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->geom->softc;
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;
if (sc->sc_idle)
g_mirror_unidle(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;
else if (bp->bio_offset + bp->bio_length >
sync->ds_offset_done &&
(bp->bio_offset < sync->ds_resync ||
sync->ds_resync == -1)) {
sync->ds_resync = bp->bio_offset -
(bp->bio_offset % MAXPHYS);
}
break;
default:
continue;
}
cbp = g_clone_bio(bp);
if (cbp == NULL) {
for (cbp = bioq_first(&queue); cbp != NULL;
cbp = bioq_first(&queue)) {
bioq_remove(&queue, cbp);
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));
}
for (cbp = bioq_first(&queue); cbp != NULL;
cbp = bioq_first(&queue)) {
bioq_remove(&queue, cbp);
G_MIRROR_LOGREQ(3, cbp, "Sending request.");
cp = cbp->bio_caller1;
cbp->bio_caller1 = NULL;
cp->index++;
g_io_request(cbp, cp);
}
/*
* Bump syncid on first write.
*/
if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) {
sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID;
g_topology_lock();
g_mirror_bump_syncid(sc);
g_topology_unlock();
}
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;
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)
{
g_topology_lock();
if (!g_mirror_can_destroy(sc)) {
g_topology_unlock();
return (0);
}
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);
wakeup(&sc->sc_worker);
sc->sc_worker = NULL;
} else {
g_mirror_destroy_device(sc);
g_topology_unlock();
free(sc, M_MIRROR);
}
return (1);
}
/*
* Worker thread.
*/
static void
g_mirror_worker(void *arg)
{
struct g_mirror_softc *sc;
struct g_mirror_disk *disk;
struct g_mirror_disk_sync *sync;
struct g_mirror_event *ep;
struct bio *bp;
u_int nreqs;
sc = arg;
mtx_lock_spin(&sched_lock);
sched_prio(curthread, PRIBIO);
mtx_unlock_spin(&sched_lock);
nreqs = 0;
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_topology_try_lock()) {
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, 1);
} 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, 0);
}
g_topology_unlock();
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))
kthread_exit(0);
}
G_MIRROR_DEBUG(5, "%s: I'm here 1.", __func__);
continue;
}
/*
* Now I/O requests.
*/
/* Get first request from the queue. */
mtx_lock(&sc->sc_queue_mtx);
bp = bioq_first(&sc->sc_queue);
if (bp == NULL) {
if (ep != NULL) {
/*
* No I/O requests and topology lock was
* already held? Try again.
*/
mtx_unlock(&sc->sc_queue_mtx);
continue;
}
if ((sc->sc_flags &
G_MIRROR_DEVICE_FLAG_DESTROY) != 0) {
mtx_unlock(&sc->sc_queue_mtx);
if (g_mirror_try_destroy(sc))
kthread_exit(0);
mtx_lock(&sc->sc_queue_mtx);
}
}
if (sc->sc_sync.ds_ndisks > 0 &&
(bp == NULL || nreqs > g_mirror_reqs_per_sync)) {
mtx_unlock(&sc->sc_queue_mtx);
/*
* It is time for synchronization...
*/
nreqs = 0;
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
if (disk->d_state !=
G_MIRROR_DISK_STATE_SYNCHRONIZING) {
continue;
}
sync = &disk->d_sync;
if (sync->ds_offset >=
sc->sc_provider->mediasize) {
continue;
}
if (sync->ds_offset > sync->ds_offset_done)
continue;
if (sync->ds_resync != -1) {
sync->ds_offset = sync->ds_resync;
sync->ds_offset_done = sync->ds_resync;
sync->ds_resync = -1;
}
g_mirror_sync_one(disk);
}
G_MIRROR_DEBUG(5, "%s: I'm here 2.", __func__);
goto sleep;
}
if (bp == NULL) {
if (g_mirror_check_idle(sc)) {
u_int idletime;
idletime = g_mirror_idletime;
if (idletime == 0)
idletime = 1;
idletime *= hz;
if (msleep(sc, &sc->sc_queue_mtx, PRIBIO | PDROP,
"m:w1", idletime) == EWOULDBLOCK) {
G_MIRROR_DEBUG(5, "%s: I'm here 3.",
__func__);
/*
* No I/O requests in 'idletime' seconds,
* so mark components as clean.
*/
g_mirror_idle(sc);
}
G_MIRROR_DEBUG(5, "%s: I'm here 4.", __func__);
} else {
MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP,
"m:w2", 0);
G_MIRROR_DEBUG(5, "%s: I'm here 5.", __func__);
}
continue;
}
nreqs++;
bioq_remove(&sc->sc_queue, bp);
mtx_unlock(&sc->sc_queue_mtx);
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) {
u_int timeout, sps;
g_mirror_sync_request(bp);
sleep:
sps = g_mirror_syncs_per_sec;
if (sps == 0) {
G_MIRROR_DEBUG(5, "%s: I'm here 6.", __func__);
continue;
}
if (ep != NULL) {
/*
* We have some pending events, don't sleep now.
*/
G_MIRROR_DEBUG(5, "%s: I'm here 7.", __func__);
continue;
}
mtx_lock(&sc->sc_queue_mtx);
if (bioq_first(&sc->sc_queue) != NULL) {
mtx_unlock(&sc->sc_queue_mtx);
G_MIRROR_DEBUG(5, "%s: I'm here 8.", __func__);
continue;
}
timeout = hz / sps;
if (timeout == 0)
timeout = 1;
MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, "m:w3",
timeout);
} else {
g_mirror_register_request(bp);
}
G_MIRROR_DEBUG(5, "%s: I'm here 9.", __func__);
}
}
/*
* Open disk's consumer if needed.
*/
static void
g_mirror_update_access(struct g_mirror_disk *disk)
{
struct g_provider *pp;
g_topology_assert();
pp = disk->d_softc->sc_provider;
if (pp == NULL)
return;
if (pp->acw > 0) {
if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0) {
G_MIRROR_DEBUG(1,
"Disk %s (device %s) marked as dirty.",
g_mirror_get_diskname(disk),
disk->d_softc->sc_name);
disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY;
}
} else if (pp->acw == 0) {
if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) {
G_MIRROR_DEBUG(1,
"Disk %s (device %s) marked as clean.",
g_mirror_get_diskname(disk),
disk->d_softc->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;
int error;
g_topology_assert();
sc = disk->d_softc;
KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING,
("Device not in RUNNING state (%s, %u).", sc->sc_name,
sc->sc_state));
G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s.", sc->sc_name,
g_mirror_get_diskname(disk));
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 = g_new_consumer(sc->sc_sync.ds_geom);
disk->d_sync.ds_consumer->private = disk;
disk->d_sync.ds_consumer->index = 0;
error = g_attach(disk->d_sync.ds_consumer, disk->d_softc->sc_provider);
KASSERT(error == 0, ("Cannot attach to %s (error=%d).",
disk->d_softc->sc_name, error));
error = g_access(disk->d_sync.ds_consumer, 1, 0, 0);
KASSERT(error == 0, ("Cannot open %s (error=%d).",
disk->d_softc->sc_name, error));
disk->d_sync.ds_data = malloc(MAXPHYS, M_MIRROR, M_WAITOK);
sc->sc_sync.ds_ndisks++;
}
/*
* Stop synchronization process.
* type: 0 - synchronization finished
* 1 - synchronization stopped
*/
static void
g_mirror_sync_stop(struct g_mirror_disk *disk, int type)
{
g_topology_assert();
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.",
disk->d_softc->sc_name, g_mirror_get_diskname(disk));
} else /* if (type == 1) */ {
G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s stopped.",
disk->d_softc->sc_name, g_mirror_get_diskname(disk));
}
g_mirror_kill_consumer(disk->d_softc, disk->d_sync.ds_consumer);
free(disk->d_sync.ds_data, M_MIRROR);
disk->d_sync.ds_consumer = NULL;
disk->d_softc->sc_sync.ds_ndisks--;
disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
}
static void
g_mirror_launch_provider(struct g_mirror_softc *sc)
{
struct g_mirror_disk *disk;
struct g_provider *pp;
g_topology_assert();
pp = g_new_providerf(sc->sc_geom, "mirror/%s", sc->sc_name);
pp->mediasize = sc->sc_mediasize;
pp->sectorsize = sc->sc_sectorsize;
sc->sc_provider = pp;
g_error_provider(pp, 0);
G_MIRROR_DEBUG(0, "Device %s: provider %s launched.", sc->sc_name,
pp->name);
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();
KASSERT(sc->sc_provider != NULL, ("NULL provider (device=%s).",
sc->sc_name));
g_error_provider(sc->sc_provider, ENXIO);
mtx_lock(&sc->sc_queue_mtx);
while ((bp = bioq_first(&sc->sc_queue)) != NULL) {
bioq_remove(&sc->sc_queue, bp);
g_io_deliver(bp, ENXIO);
}
mtx_unlock(&sc->sc_queue_mtx);
G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", sc->sc_name,
sc->sc_provider->name);
sc->sc_provider->flags |= G_PF_WITHER;
g_orphan_provider(sc->sc_provider, ENXIO);
sc->sc_provider = NULL;
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 fucked up, sorry.
* I think the best choice here is don't touch
* this disk and inform the user laudly.
*/
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, boolean_t force)
{
struct g_mirror_disk *disk;
u_int state;
g_topology_assert();
switch (sc->sc_state) {
case G_MIRROR_DEVICE_STATE_STARTING:
{
struct g_mirror_disk *pdisk, *tdisk;
u_int dirty, ndisks, genid, syncid;
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.
*/
if ((force && g_mirror_ndisks(sc, -1) > 0) ||
sc->sc_ndisks == g_mirror_ndisks(sc, -1)) {
;
} else if (g_mirror_ndisks(sc, -1) == 0) {
/*
* Disks went down in starting phase, so destroy
* device.
*/
callout_drain(&sc->sc_callout);
sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY;
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;
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.
*/
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);
}
}
/*
* 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) {
/* 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;
}
wakeup(&g_mirror_class);
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);
}
/*
* 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;
g_topology_assert();
sc = disk->d_softc;
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(0, "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_NEW)
disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY;
else 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_access(disk);
g_mirror_update_metadata(disk);
G_MIRROR_DEBUG(0, "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)
return (error);
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 (error != 0) {
G_MIRROR_DEBUG(1, "Cannot read metadata from %s (error=%d).",
cp->provider->name, error);
if (buf != NULL)
g_free(buf);
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 (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);
}
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();
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 int
g_mirror_access(struct g_provider *pp, int acr, int acw, int ace)
{
struct g_mirror_softc *sc;
struct g_mirror_disk *disk;
int dcr, dcw, dce;
g_topology_assert();
G_MIRROR_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, acr,
acw, ace);
dcr = pp->acr + acr;
dcw = pp->acw + acw;
dce = pp->ace + ace;
sc = pp->geom->softc;
if (sc == NULL || LIST_EMPTY(&sc->sc_disks) ||
(sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) {
if (acr <= 0 && acw <= 0 && ace <= 0)
return (0);
else
return (ENXIO);
}
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE)
continue;
/*
* Mark disk as dirty on open and unmark on close.
*/
if (pp->acw == 0 && dcw > 0) {
G_MIRROR_DEBUG(1,
"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);
} else if (pp->acw > 0 && dcw == 0) {
G_MIRROR_DEBUG(1,
"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 struct g_geom *
g_mirror_create(struct g_class *mp, const struct g_mirror_metadata *md)
{
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_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 = 0;
bioq_init(&sc->sc_queue);
mtx_init(&sc->sc_queue_mtx, "gmirror:queue", NULL, MTX_DEF);
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, CALLOUT_MPSAFE);
sc->sc_state = G_MIRROR_DEVICE_STATE_STARTING;
gp->softc = sc;
sc->sc_geom = gp;
sc->sc_provider = NULL;
/*
* 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 = kthread_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);
mtx_destroy(&sc->sc_events_mtx);
mtx_destroy(&sc->sc_queue_mtx);
g_destroy_geom(sc->sc_geom);
free(sc, M_MIRROR);
return (NULL);
}
G_MIRROR_DEBUG(0, "Device %s created (id=%u).", sc->sc_name, sc->sc_id);
/*
* 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, boolean_t force)
{
struct g_provider *pp;
g_topology_assert();
if (sc == NULL)
return (ENXIO);
pp = sc->sc_provider;
if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
if (force) {
G_MIRROR_DEBUG(1, "Device %s is still open, so it "
"can't be definitely removed.", pp->name);
} else {
G_MIRROR_DEBUG(1,
"Device %s is still open (r%dw%de%d).", pp->name,
pp->acr, pp->acw, pp->ace);
return (EBUSY);
}
}
sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY;
sc->sc_flags |= G_MIRROR_DEVICE_FLAG_WAIT;
g_topology_unlock();
G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc);
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);
g_topology_lock();
g_mirror_destroy_device(sc);
free(sc, M_MIRROR);
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' && strcmp(md.md_provider, pp->name) != 0)
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_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);
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);
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_mirror_destroy(sc, 1);
return (NULL);
}
return (gp);
}
static int
g_mirror_destroy_geom(struct gctl_req *req __unused,
struct g_class *mp __unused, struct g_geom *gp)
{
return (g_mirror_destroy(gp->softc, 0));
}
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;
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_done == 0)
sbuf_printf(sb, "0%%");
else {
sbuf_printf(sb, "%u%%",
(u_int)((disk->d_sync.ds_offset_done * 100) /
sc->sc_provider->mediasize));
}
sbuf_printf(sb, "</Synchronized>\n");
}
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");
#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));
} else {
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_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");
}
}
static void
g_mirror_shutdown(void *arg, int howto)
{
struct g_class *mp;
struct g_geom *gp, *gp2;
mp = arg;
DROP_GIANT();
g_topology_lock();
LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) {
if (gp->softc == NULL)
continue;
g_mirror_destroy(gp->softc, 1);
}
g_topology_unlock();
PICKUP_GIANT();
#if 0
tsleep(&gp, PRIBIO, "m:shutdown", hz * 20);
#endif
}
static void
g_mirror_init(struct g_class *mp)
{
g_mirror_ehtag = EVENTHANDLER_REGISTER(shutdown_post_sync,
g_mirror_shutdown, mp, SHUTDOWN_PRI_FIRST);
if (g_mirror_ehtag == NULL)
G_MIRROR_DEBUG(0, "Warning! Cannot register shutdown event.");
}
static void
g_mirror_fini(struct g_class *mp)
{
if (g_mirror_ehtag == NULL)
return;
EVENTHANDLER_DEREGISTER(shutdown_post_sync, g_mirror_ehtag);
}
static int
g_mirror_can_go(void)
{
struct g_mirror_softc *sc;
struct g_geom *gp;
struct g_provider *pp;
int can_go;
DROP_GIANT();
can_go = 1;
g_topology_lock();
LIST_FOREACH(gp, &g_mirror_class.geom, geom) {
sc = gp->softc;
if (sc == NULL) {
can_go = 0;
break;
}
pp = sc->sc_provider;
if (pp == NULL || pp->error != 0) {
can_go = 0;
break;
}
}
g_topology_unlock();
PICKUP_GIANT();
return (can_go);
}
static void
g_mirror_rootwait(void)
{
/*
* HACK: Wait for GEOM, because g_mirror_rootwait() can be called,
* HACK: before we get providers for tasting.
*/
tsleep(&g_mirror_class, PRIBIO, "mroot", hz * 3);
/*
* Wait for mirrors in degraded state.
*/
for (;;) {
if (g_mirror_can_go())
break;
tsleep(&g_mirror_class, PRIBIO, "mroot", hz);
}
}
SYSINIT(g_mirror_root, SI_SUB_RAID, SI_ORDER_FIRST, g_mirror_rootwait, NULL)
DECLARE_GEOM_CLASS(g_mirror_class, g_mirror);
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