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9a9f504132
freebsd-nq/sys/geom/mirror/g_mirror.c
Pawel Jakub Dawidek 9a9f504132 - Add genid field to the metadata which will allow to improve reliability a bit. 
After this change, when component is disconnected because of an I/O error,
  it will not be connected and synchronized automatically, it will be logged
  as broken and skipped. Autosynchronization can occur, when component is
  disconnected (on orphan event) and connected again - there were no I/O
  error, so there is no need to not connected the component, but when there were
  writes while it wasn't connected, it will be synchronized.
  This fix cases, when component is disconnected because of I/O error and can be
  connected again and again.
- Bump version number.
- Add version change history.
- Implement backward compatibility mechanism. After this change when metadata in
  old version is detected, it is automatically upgraded to the new (current)
  version.
2004-12-22 23:09:32 +00:00

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/*-
* Copyright (c) 2004 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 <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 = 100;
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_OFW;
g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED,
G_MIRROR_EVENT_DONTWAIT);
}
static void
g_mirror_spoiled(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_IMM;
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_IMM;
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) {
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_IMM;
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_IMM;
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_OFW) != 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;
curthread->td_base_pri = PRIBIO;
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_OFW;
}
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_OFW;
}
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);
}
/*
* Bump syncid here, if we need to do it immediately.
*/
if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID_IMM) != 0) {
sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID;
g_mirror_bump_syncid(sc);
}
if ((sc->sc_bump_id & G_MIRROR_BUMP_GENID_IMM) != 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_OFW) != 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
static 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);
}
static 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->spoiled = g_mirror_spoiled;
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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