diff options
Diffstat (limited to 'sys/geom/mirror/g_mirror.c')
| -rw-r--r-- | sys/geom/mirror/g_mirror.c | 3638 |
1 files changed, 3638 insertions, 0 deletions
diff --git a/sys/geom/mirror/g_mirror.c b/sys/geom/mirror/g_mirror.c new file mode 100644 index 000000000000..03902a2f2491 --- /dev/null +++ b/sys/geom/mirror/g_mirror.c @@ -0,0 +1,3638 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2004-2006 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/param.h> +#include <sys/systm.h> +#include <sys/bio.h> +#include <sys/eventhandler.h> +#include <sys/fail.h> +#include <sys/kernel.h> +#include <sys/kthread.h> +#include <sys/limits.h> +#include <sys/lock.h> +#include <sys/malloc.h> +#include <sys/mutex.h> +#include <sys/proc.h> +#include <sys/reboot.h> +#include <sys/sbuf.h> +#include <sys/sched.h> +#include <sys/sx.h> +#include <sys/sysctl.h> + +#include <geom/geom.h> +#include <geom/geom_dbg.h> +#include <geom/geom_disk.h> +#include <geom/mirror/g_mirror.h> + +FEATURE(geom_mirror, "GEOM mirroring support"); + +static MALLOC_DEFINE(M_MIRROR, "mirror_data", "GEOM_MIRROR Data"); + +SYSCTL_DECL(_kern_geom); +static SYSCTL_NODE(_kern_geom, OID_AUTO, mirror, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, + "GEOM_MIRROR stuff"); +int g_mirror_debug = 0; +SYSCTL_INT(_kern_geom_mirror, OID_AUTO, debug, CTLFLAG_RWTUN, &g_mirror_debug, 0, + "Debug level"); +bool g_launch_mirror_before_timeout = true; +SYSCTL_BOOL(_kern_geom_mirror, OID_AUTO, launch_mirror_before_timeout, + CTLFLAG_RWTUN, &g_launch_mirror_before_timeout, 0, + "If false, force gmirror to wait out the full kern.geom.mirror.timeout " + "before launching mirrors"); +static u_int g_mirror_timeout = 4; +SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, timeout, CTLFLAG_RWTUN, &g_mirror_timeout, + 0, "Time to wait on all mirror components"); +static u_int g_mirror_idletime = 5; +SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, idletime, CTLFLAG_RWTUN, + &g_mirror_idletime, 0, "Mark components as clean when idling"); +static u_int g_mirror_disconnect_on_failure = 1; +SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, disconnect_on_failure, CTLFLAG_RWTUN, + &g_mirror_disconnect_on_failure, 0, "Disconnect component on I/O failure."); +static u_int g_mirror_syncreqs = 2; +SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, sync_requests, CTLFLAG_RDTUN, + &g_mirror_syncreqs, 0, "Parallel synchronization I/O requests."); +static u_int g_mirror_sync_period = 5; +SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, sync_update_period, CTLFLAG_RWTUN, + &g_mirror_sync_period, 0, + "Metadata update period during synchronization, in seconds"); + +#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_post_sync = NULL; +static int g_mirror_shutdown = 0; + +static g_ctl_destroy_geom_t g_mirror_destroy_geom; +static g_taste_t g_mirror_taste; +static g_init_t g_mirror_init; +static g_fini_t g_mirror_fini; +static g_provgone_t g_mirror_providergone; +static g_resize_t g_mirror_resize; + +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, + .providergone = g_mirror_providergone, + .resize = g_mirror_resize +}; + +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, bool 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_timeout_drain(struct g_mirror_softc *sc); +static int g_mirror_refresh_device(struct g_mirror_softc *sc, + const struct g_provider *pp, const struct g_mirror_metadata *md); +static void g_mirror_sync_reinit(const struct g_mirror_disk *disk, + struct bio *bp, off_t offset); +static void g_mirror_sync_stop(struct g_mirror_disk *disk, int type); +static void g_mirror_register_request(struct g_mirror_softc *sc, + struct bio *bp); +static void g_mirror_sync_release(struct g_mirror_softc *sc); + +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); +} + +static int +g_mirror_event_dispatch(struct g_mirror_event *ep, void *arg, int state, + int flags) +{ + struct g_mirror_softc *sc; + struct g_mirror_disk *disk; + int error; + + 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_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, ep); + sx_xunlock(&sc->sc_lock); + 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); + } + error = ep->e_error; + g_mirror_event_free(ep); + sx_xlock(&sc->sc_lock); + return (error); +} + +int +g_mirror_event_send(void *arg, int state, int flags) +{ + struct g_mirror_event *ep; + + ep = malloc(sizeof(*ep), M_MIRROR, M_WAITOK); + return (g_mirror_event_dispatch(ep, arg, state, flags)); +} + +static struct g_mirror_event * +g_mirror_event_first(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; + + sc = disk->d_softc; + sx_assert(&sc->sc_lock, SX_XLOCKED); + + 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; + + sx_assert(&sc->sc_lock, SX_XLOCKED); + + 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, 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; + + g_topology_assert(); + + 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) +{ + struct g_consumer *cp; + int error; + + g_topology_assert_not(); + KASSERT(disk->d_consumer == NULL, + ("Disk already connected (device %s).", disk->d_softc->sc_name)); + + g_topology_lock(); + cp = g_new_consumer(disk->d_softc->sc_geom); + cp->flags |= G_CF_DIRECT_RECEIVE; + error = g_attach(cp, pp); + if (error != 0) { + g_destroy_consumer(cp); + g_topology_unlock(); + return (error); + } + error = g_access(cp, 1, 1, 1); + if (error != 0) { + g_detach(cp); + g_destroy_consumer(cp); + g_topology_unlock(); + G_MIRROR_DEBUG(0, "Cannot open consumer %s (error=%d).", + pp->name, error); + return (error); + } + g_topology_unlock(); + disk->d_consumer = cp; + disk->d_consumer->private = disk; + disk->d_consumer->index = 0; + + 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 i, 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_flags = md->md_dflags; + error = g_getattr("GEOM::candelete", disk->d_consumer, &i); + if (error == 0 && i != 0) + disk->d_flags |= G_MIRROR_DISK_FLAG_CANDELETE; + error = g_getattr("GEOM::rotation_rate", disk->d_consumer, + &disk->d_rotation_rate); + if (error) + disk->d_rotation_rate = DISK_RR_UNKNOWN; + 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_update_ts = time_uptime; + disk->d_genid = md->md_genid; + disk->d_sync.ds_syncid = md->md_syncid; + disk->d_init_ndisks = md->md_all; + disk->d_init_slice = md->md_slice; + disk->d_init_balance = md->md_balance; + disk->d_init_mediasize = md->md_mediasize; + if (errorp != NULL) + *errorp = 0; + return (disk); +fail: + if (errorp != NULL) + *errorp = error; + if (disk != NULL) + free(disk, M_MIRROR); + return (NULL); +} + +static void +g_mirror_destroy_disk(struct g_mirror_disk *disk) +{ + struct g_mirror_softc *sc; + + g_topology_assert_not(); + sc = disk->d_softc; + sx_assert(&sc->sc_lock, SX_XLOCKED); + + g_topology_lock(); + LIST_REMOVE(disk, d_next); + g_topology_unlock(); + g_mirror_event_cancel(disk); + if (sc->sc_hint == disk) + sc->sc_hint = NULL; + switch (disk->d_state) { + case G_MIRROR_DISK_STATE_SYNCHRONIZING: + g_mirror_sync_stop(disk, 1); + /* FALLTHROUGH */ + case G_MIRROR_DISK_STATE_NEW: + case G_MIRROR_DISK_STATE_STALE: + case G_MIRROR_DISK_STATE_ACTIVE: + g_topology_lock(); + g_mirror_disconnect_consumer(sc, disk->d_consumer); + g_topology_unlock(); + free(disk, M_MIRROR); + break; + default: + KASSERT(0 == 1, ("Wrong disk state (%s, %s).", + g_mirror_get_diskname(disk), + g_mirror_disk_state2str(disk->d_state))); + } +} + +static void +g_mirror_free_device(struct g_mirror_softc *sc) +{ + + g_topology_assert(); + + mtx_destroy(&sc->sc_queue_mtx); + mtx_destroy(&sc->sc_events_mtx); + mtx_destroy(&sc->sc_done_mtx); + sx_destroy(&sc->sc_lock); + free(sc, M_MIRROR); +} + +static void +g_mirror_providergone(struct g_provider *pp) +{ + struct g_mirror_softc *sc = pp->private; + + if ((--sc->sc_refcnt) == 0) + g_mirror_free_device(sc); +} + +static void +g_mirror_destroy_device(struct g_mirror_softc *sc) +{ + struct g_mirror_disk *disk; + struct g_mirror_event *ep; + struct g_geom *gp; + struct g_consumer *cp, *tmpcp; + + g_topology_assert_not(); + sx_assert(&sc->sc_lock, SX_XLOCKED); + + gp = sc->sc_geom; + if (sc->sc_provider != NULL) + g_mirror_destroy_provider(sc); + for (disk = LIST_FIRST(&sc->sc_disks); disk != NULL; + disk = LIST_FIRST(&sc->sc_disks)) { + disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; + g_mirror_update_metadata(disk); + g_mirror_destroy_disk(disk); + } + while ((ep = g_mirror_event_first(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); + } + } + g_mirror_timeout_drain(sc); + + g_topology_lock(); + LIST_FOREACH_SAFE(cp, &sc->sc_sync.ds_geom->consumer, consumer, tmpcp) { + g_mirror_disconnect_consumer(sc, cp); + } + g_wither_geom(sc->sc_sync.ds_geom, ENXIO); + G_MIRROR_DEBUG(0, "Device %s destroyed.", gp->name); + g_wither_geom(gp, ENXIO); + sx_xunlock(&sc->sc_lock); + if ((--sc->sc_refcnt) == 0) + g_mirror_free_device(sc); + g_topology_unlock(); +} + +static void +g_mirror_orphan(struct g_consumer *cp) +{ + struct g_mirror_disk *disk; + + g_topology_assert(); + + disk = cp->private; + if (disk == NULL) + return; + disk->d_softc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; + g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, + G_MIRROR_EVENT_DONTWAIT); +} + +/* + * Function should return the next active disk on the list. + * It is possible that it will be the same disk as given. + * If there are no active disks on list, NULL is returned. + */ +static __inline struct g_mirror_disk * +g_mirror_find_next(struct g_mirror_softc *sc, struct g_mirror_disk *disk) +{ + struct g_mirror_disk *dp; + + for (dp = LIST_NEXT(disk, d_next); dp != disk; + dp = LIST_NEXT(dp, d_next)) { + if (dp == NULL) + dp = LIST_FIRST(&sc->sc_disks); + if (dp->d_state == G_MIRROR_DISK_STATE_ACTIVE) + break; + } + if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) + return (NULL); + return (dp); +} + +static struct g_mirror_disk * +g_mirror_get_disk(struct g_mirror_softc *sc) +{ + struct g_mirror_disk *disk; + + if (sc->sc_hint == NULL) { + sc->sc_hint = LIST_FIRST(&sc->sc_disks); + if (sc->sc_hint == NULL) + return (NULL); + } + disk = sc->sc_hint; + if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) { + disk = g_mirror_find_next(sc, disk); + if (disk == NULL) + return (NULL); + } + sc->sc_hint = g_mirror_find_next(sc, disk); + return (disk); +} + +static int +g_mirror_write_metadata(struct g_mirror_disk *disk, + struct g_mirror_metadata *md) +{ + struct g_mirror_softc *sc; + struct g_consumer *cp; + off_t offset, length; + u_char *sector; + int error = 0; + + g_topology_assert_not(); + sc = disk->d_softc; + sx_assert(&sc->sc_lock, SX_LOCKED); + + cp = disk->d_consumer; + KASSERT(cp != NULL, ("NULL consumer (%s).", sc->sc_name)); + KASSERT(cp->provider != NULL, ("NULL provider (%s).", sc->sc_name)); + KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, + ("Consumer %s closed? (r%dw%de%d).", cp->provider->name, cp->acr, + cp->acw, cp->ace)); + length = cp->provider->sectorsize; + offset = cp->provider->mediasize - length; + sector = malloc((size_t)length, M_MIRROR, M_WAITOK | M_ZERO); + if (md != NULL && + (sc->sc_flags & G_MIRROR_DEVICE_FLAG_WIPE) == 0) { + /* + * Handle the case, when the size of parent provider reduced. + */ + if (offset < md->md_mediasize) + error = ENOSPC; + else + mirror_metadata_encode(md, sector); + } + KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_metadata_write, error); + if (error == 0) + error = g_write_data(cp, offset, sector, length); + free(sector, M_MIRROR); + if (error != 0) { + if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) { + disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN; + G_MIRROR_DEBUG(0, "Cannot write metadata on %s " + "(device=%s, error=%d).", + g_mirror_get_diskname(disk), sc->sc_name, error); + } else { + G_MIRROR_DEBUG(1, "Cannot write metadata on %s " + "(device=%s, error=%d).", + g_mirror_get_diskname(disk), sc->sc_name, error); + } + if (g_mirror_disconnect_on_failure && + g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) { + sc->sc_bump_id |= G_MIRROR_BUMP_GENID; + g_mirror_event_send(disk, + G_MIRROR_DISK_STATE_DISCONNECTED, + G_MIRROR_EVENT_DONTWAIT); + } + } + return (error); +} + +static int +g_mirror_clear_metadata(struct g_mirror_disk *disk) +{ + int error; + + g_topology_assert_not(); + sx_assert(&disk->d_softc->sc_lock, SX_LOCKED); + + if (disk->d_softc->sc_type != G_MIRROR_TYPE_AUTOMATIC) + return (0); + error = g_mirror_write_metadata(disk, NULL); + if (error == 0) { + G_MIRROR_DEBUG(2, "Metadata on %s cleared.", + g_mirror_get_diskname(disk)); + } else { + G_MIRROR_DEBUG(0, + "Cannot clear metadata on disk %s (error=%d).", + g_mirror_get_diskname(disk), error); + } + return (error); +} + +void +g_mirror_fill_metadata(struct g_mirror_softc *sc, struct g_mirror_disk *disk, + struct g_mirror_metadata *md) +{ + + bzero(md, sizeof(*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); + if (disk == NULL) { + md->md_did = arc4random(); + } 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; + if ((disk->d_flags & G_MIRROR_DISK_FLAG_HARDCODED) != 0) { + strlcpy(md->md_provider, + disk->d_consumer->provider->name, + sizeof(md->md_provider)); + } + md->md_provsize = disk->d_consumer->provider->mediasize; + } +} + +void +g_mirror_update_metadata(struct g_mirror_disk *disk) +{ + struct g_mirror_softc *sc; + struct g_mirror_metadata md; + int error; + + g_topology_assert_not(); + sc = disk->d_softc; + sx_assert(&sc->sc_lock, SX_LOCKED); + + if (sc->sc_type != G_MIRROR_TYPE_AUTOMATIC) + return; + if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_WIPE) == 0) + g_mirror_fill_metadata(sc, disk, &md); + error = g_mirror_write_metadata(disk, &md); + if (error == 0) { + G_MIRROR_DEBUG(2, "Metadata on %s updated.", + g_mirror_get_diskname(disk)); + } else { + G_MIRROR_DEBUG(0, + "Cannot update metadata on disk %s (error=%d).", + g_mirror_get_diskname(disk), error); + } +} + +static void +g_mirror_bump_syncid(struct g_mirror_softc *sc) +{ + struct g_mirror_disk *disk; + + g_topology_assert_not(); + sx_assert(&sc->sc_lock, SX_XLOCKED); + KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, + ("%s called with no active disks (device=%s).", __func__, + sc->sc_name)); + + sc->sc_syncid++; + G_MIRROR_DEBUG(1, "Device %s: syncid bumped to %u.", sc->sc_name, + sc->sc_syncid); + LIST_FOREACH(disk, &sc->sc_disks, d_next) { + if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || + disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { + disk->d_sync.ds_syncid = sc->sc_syncid; + g_mirror_update_metadata(disk); + } + } +} + +static void +g_mirror_bump_genid(struct g_mirror_softc *sc) +{ + struct g_mirror_disk *disk; + + g_topology_assert_not(); + sx_assert(&sc->sc_lock, SX_XLOCKED); + KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, + ("%s called with no active disks (device=%s).", __func__, + sc->sc_name)); + + sc->sc_genid++; + G_MIRROR_DEBUG(1, "Device %s: genid bumped to %u.", sc->sc_name, + sc->sc_genid); + LIST_FOREACH(disk, &sc->sc_disks, d_next) { + if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || + disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { + disk->d_genid = sc->sc_genid; + g_mirror_update_metadata(disk); + } + } +} + +static int +g_mirror_idle(struct g_mirror_softc *sc, int acw) +{ + struct g_mirror_disk *disk; + int timeout; + + g_topology_assert_not(); + sx_assert(&sc->sc_lock, SX_XLOCKED); + + if (sc->sc_provider == NULL) + return (0); + if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) + return (0); + if (sc->sc_idle) + return (0); + if (sc->sc_writes > 0) + return (0); + if (acw > 0 || (acw == -1 && sc->sc_provider->acw > 0)) { + timeout = g_mirror_idletime - (time_uptime - sc->sc_last_write); + if (!g_mirror_shutdown && timeout > 0) + return (timeout); + } + sc->sc_idle = 1; + LIST_FOREACH(disk, &sc->sc_disks, d_next) { + if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) + continue; + G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as clean.", + g_mirror_get_diskname(disk), sc->sc_name); + disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; + g_mirror_update_metadata(disk); + } + return (0); +} + +static void +g_mirror_unidle(struct g_mirror_softc *sc) +{ + struct g_mirror_disk *disk; + + g_topology_assert_not(); + sx_assert(&sc->sc_lock, SX_XLOCKED); + + if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) + return; + sc->sc_idle = 0; + sc->sc_last_write = time_uptime; + LIST_FOREACH(disk, &sc->sc_disks, d_next) { + if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) + continue; + G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as dirty.", + g_mirror_get_diskname(disk), sc->sc_name); + disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; + g_mirror_update_metadata(disk); + } +} + +static void +g_mirror_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); + TAILQ_INSERT_TAIL(&sc->sc_queue, bp, bio_queue); + mtx_unlock(&sc->sc_queue_mtx); + wakeup(sc); +} + +static void +g_mirror_regular_request_error(struct g_mirror_softc *sc, + struct g_mirror_disk *disk, struct bio *bp) +{ + + if ((bp->bio_cmd == BIO_FLUSH || bp->bio_cmd == BIO_SPEEDUP) && + bp->bio_error == EOPNOTSUPP) + return; + + if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) { + disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN; + G_MIRROR_LOGREQ(0, bp, "Request failed (error=%d).", + bp->bio_error); + } else { + G_MIRROR_LOGREQ(1, bp, "Request failed (error=%d).", + bp->bio_error); + } + if (g_mirror_disconnect_on_failure && + g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) { + if (bp->bio_error == ENXIO && + bp->bio_cmd == BIO_READ) + sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; + else if (bp->bio_error == ENXIO) + sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID_NOW; + else + sc->sc_bump_id |= G_MIRROR_BUMP_GENID; + g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, + G_MIRROR_EVENT_DONTWAIT); + } +} + +static void +g_mirror_regular_request(struct g_mirror_softc *sc, struct bio *bp) +{ + struct g_mirror_disk *disk; + struct bio *pbp; + + g_topology_assert_not(); + KASSERT(sc->sc_provider == bp->bio_parent->bio_to, + ("regular request %p with unexpected origin", bp)); + + pbp = bp->bio_parent; + bp->bio_from->index--; + if (bp->bio_cmd == BIO_WRITE || bp->bio_cmd == BIO_DELETE) + sc->sc_writes--; + disk = bp->bio_from->private; + if (disk == NULL) { + g_topology_lock(); + g_mirror_kill_consumer(sc, bp->bio_from); + g_topology_unlock(); + } + + switch (bp->bio_cmd) { + case BIO_READ: + KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_read, + bp->bio_error); + break; + case BIO_WRITE: + KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_write, + bp->bio_error); + break; + case BIO_DELETE: + KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_delete, + bp->bio_error); + break; + case BIO_FLUSH: + KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_flush, + bp->bio_error); + break; + case BIO_SPEEDUP: + KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_speedup, + bp->bio_error); + break; + } + + pbp->bio_inbed++; + KASSERT(pbp->bio_inbed <= pbp->bio_children, + ("bio_inbed (%u) is bigger than bio_children (%u).", pbp->bio_inbed, + pbp->bio_children)); + if (bp->bio_error == 0 && pbp->bio_error == 0) { + G_MIRROR_LOGREQ(3, bp, "Request delivered."); + g_destroy_bio(bp); + if (pbp->bio_children == pbp->bio_inbed) { + G_MIRROR_LOGREQ(3, pbp, "Request delivered."); + pbp->bio_completed = pbp->bio_length; + if (pbp->bio_cmd == BIO_WRITE || + pbp->bio_cmd == BIO_DELETE) { + TAILQ_REMOVE(&sc->sc_inflight, pbp, bio_queue); + /* Release delayed sync requests if possible. */ + g_mirror_sync_release(sc); + } + g_io_deliver(pbp, pbp->bio_error); + } + return; + } else if (bp->bio_error != 0) { + if (pbp->bio_error == 0) + pbp->bio_error = bp->bio_error; + if (disk != NULL) + g_mirror_regular_request_error(sc, disk, bp); + switch (pbp->bio_cmd) { + case BIO_DELETE: + case BIO_WRITE: + case BIO_FLUSH: + case BIO_SPEEDUP: + pbp->bio_inbed--; + pbp->bio_children--; + break; + } + } + g_destroy_bio(bp); + + switch (pbp->bio_cmd) { + case BIO_READ: + if (pbp->bio_inbed < pbp->bio_children) + break; + + /* + * If there is only one active disk we want to double-check that + * it is, in fact, the disk that we already tried. This is + * necessary because we might have just lost a race with a + * removal of the tried disk (likely because of the same error) + * and the only remaining disk is still viable for a retry. + */ + if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 1 && + disk != NULL && + disk->d_state == G_MIRROR_DISK_STATE_ACTIVE) { + g_io_deliver(pbp, pbp->bio_error); + } else { + pbp->bio_error = 0; + mtx_lock(&sc->sc_queue_mtx); + TAILQ_INSERT_TAIL(&sc->sc_queue, pbp, bio_queue); + mtx_unlock(&sc->sc_queue_mtx); + G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); + wakeup(sc); + } + break; + case BIO_DELETE: + case BIO_WRITE: + case BIO_FLUSH: + case BIO_SPEEDUP: + 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; + } + if (pbp->bio_cmd == BIO_WRITE || pbp->bio_cmd == BIO_DELETE) { + TAILQ_REMOVE(&sc->sc_inflight, pbp, bio_queue); + /* Release delayed sync requests if possible. */ + g_mirror_sync_release(sc); + } + g_io_deliver(pbp, pbp->bio_error); + break; + default: + KASSERT(1 == 0, ("Invalid request: %u.", pbp->bio_cmd)); + break; + } +} + +static void +g_mirror_sync_done(struct bio *bp) +{ + struct g_mirror_softc *sc; + + G_MIRROR_LOGREQ(3, bp, "Synchronization request delivered."); + sc = bp->bio_from->geom->softc; + bp->bio_cflags = G_MIRROR_BIO_FLAG_SYNC; + mtx_lock(&sc->sc_queue_mtx); + TAILQ_INSERT_TAIL(&sc->sc_queue, bp, bio_queue); + mtx_unlock(&sc->sc_queue_mtx); + wakeup(sc); +} + +static void +g_mirror_candelete(struct bio *bp) +{ + struct g_mirror_softc *sc; + struct g_mirror_disk *disk; + int val; + + sc = bp->bio_to->private; + LIST_FOREACH(disk, &sc->sc_disks, d_next) { + if (disk->d_flags & G_MIRROR_DISK_FLAG_CANDELETE) + break; + } + val = disk != NULL; + g_handleattr(bp, "GEOM::candelete", &val, sizeof(val)); +} + +static void +g_mirror_kernel_dump(struct bio *bp) +{ + struct g_mirror_softc *sc; + struct g_mirror_disk *disk; + struct bio *cbp; + struct g_kerneldump *gkd; + + /* + * We configure dumping to the first component, because this component + * will be used for reading with 'prefer' balance algorithm. + * If the component with the highest priority is currently disconnected + * we will not be able to read the dump after the reboot if it will be + * connected and synchronized later. Can we do something better? + */ + sc = bp->bio_to->private; + disk = LIST_FIRST(&sc->sc_disks); + + gkd = (struct g_kerneldump *)bp->bio_data; + if (gkd->length > bp->bio_to->mediasize) + gkd->length = bp->bio_to->mediasize; + cbp = g_clone_bio(bp); + if (cbp == NULL) { + g_io_deliver(bp, ENOMEM); + return; + } + cbp->bio_done = g_std_done; + g_io_request(cbp, disk->d_consumer); + G_MIRROR_DEBUG(1, "Kernel dump will go to %s.", + g_mirror_get_diskname(disk)); +} + +static void +g_mirror_rotation_rate(struct bio *bp) +{ + struct g_mirror_softc *sc; + struct g_mirror_disk *disk; + bool first = true; + uint16_t rr = DISK_RR_UNKNOWN; + + sc = bp->bio_to->private; + LIST_FOREACH(disk, &sc->sc_disks, d_next) { + if (first) + rr = disk->d_rotation_rate; + else if (rr != disk->d_rotation_rate) { + rr = DISK_RR_UNKNOWN; + break; + } + first = false; + } + g_handleattr(bp, "GEOM::rotation_rate", &rr, sizeof(rr)); +} + +static void +g_mirror_start(struct bio *bp) +{ + struct g_mirror_softc *sc; + + sc = bp->bio_to->private; + /* + * If sc == NULL or there are no valid disks, provider's error + * should be set and g_mirror_start() should not be called at all. + */ + KASSERT(sc != NULL && sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, + ("Provider's error should be set (error=%d)(mirror=%s).", + bp->bio_to->error, bp->bio_to->name)); + G_MIRROR_LOGREQ(3, bp, "Request received."); + + switch (bp->bio_cmd) { + case BIO_READ: + case BIO_WRITE: + case BIO_DELETE: + case BIO_SPEEDUP: + case BIO_FLUSH: + break; + case BIO_GETATTR: + if (!strcmp(bp->bio_attribute, "GEOM::candelete")) { + g_mirror_candelete(bp); + return; + } else if (strcmp("GEOM::kerneldump", bp->bio_attribute) == 0) { + g_mirror_kernel_dump(bp); + return; + } else if (!strcmp(bp->bio_attribute, "GEOM::rotation_rate")) { + g_mirror_rotation_rate(bp); + return; + } + /* FALLTHROUGH */ + default: + g_io_deliver(bp, EOPNOTSUPP); + return; + } + mtx_lock(&sc->sc_queue_mtx); + if (bp->bio_to->error != 0) { + mtx_unlock(&sc->sc_queue_mtx); + g_io_deliver(bp, bp->bio_to->error); + return; + } + TAILQ_INSERT_TAIL(&sc->sc_queue, bp, bio_queue); + mtx_unlock(&sc->sc_queue_mtx); + G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); + wakeup(sc); +} + +/* + * Return true if the given request is colliding with a in-progress + * synchronization request. + */ +static bool +g_mirror_sync_collision(struct g_mirror_softc *sc, struct bio *bp) +{ + struct g_mirror_disk *disk; + struct bio *sbp; + off_t rstart, rend, sstart, send; + u_int i; + + if (sc->sc_sync.ds_ndisks == 0) + return (false); + rstart = bp->bio_offset; + rend = bp->bio_offset + bp->bio_length; + LIST_FOREACH(disk, &sc->sc_disks, d_next) { + if (disk->d_state != G_MIRROR_DISK_STATE_SYNCHRONIZING) + continue; + for (i = 0; i < g_mirror_syncreqs; i++) { + sbp = disk->d_sync.ds_bios[i]; + if (sbp == NULL) + continue; + sstart = sbp->bio_offset; + send = sbp->bio_offset + sbp->bio_length; + if (rend > sstart && rstart < send) + return (true); + } + } + return (false); +} + +/* + * Return true if the given sync request is colliding with a in-progress regular + * request. + */ +static bool +g_mirror_regular_collision(struct g_mirror_softc *sc, struct bio *sbp) +{ + off_t rstart, rend, sstart, send; + struct bio *bp; + + if (sc->sc_sync.ds_ndisks == 0) + return (false); + sstart = sbp->bio_offset; + send = sbp->bio_offset + sbp->bio_length; + TAILQ_FOREACH(bp, &sc->sc_inflight, bio_queue) { + rstart = bp->bio_offset; + rend = bp->bio_offset + bp->bio_length; + if (rend > sstart && rstart < send) + return (true); + } + return (false); +} + +/* + * Puts regular request onto delayed queue. + */ +static void +g_mirror_regular_delay(struct g_mirror_softc *sc, struct bio *bp) +{ + + G_MIRROR_LOGREQ(2, bp, "Delaying request."); + TAILQ_INSERT_TAIL(&sc->sc_regular_delayed, bp, bio_queue); +} + +/* + * Puts synchronization request onto delayed queue. + */ +static void +g_mirror_sync_delay(struct g_mirror_softc *sc, struct bio *bp) +{ + + G_MIRROR_LOGREQ(2, bp, "Delaying synchronization request."); + TAILQ_INSERT_TAIL(&sc->sc_sync_delayed, bp, bio_queue); +} + +/* + * Requeue delayed regular requests. + */ +static void +g_mirror_regular_release(struct g_mirror_softc *sc) +{ + struct bio *bp; + + if ((bp = TAILQ_FIRST(&sc->sc_regular_delayed)) == NULL) + return; + if (g_mirror_sync_collision(sc, bp)) + return; + + G_MIRROR_DEBUG(2, "Requeuing regular requests after collision."); + mtx_lock(&sc->sc_queue_mtx); + TAILQ_CONCAT(&sc->sc_regular_delayed, &sc->sc_queue, bio_queue); + TAILQ_SWAP(&sc->sc_regular_delayed, &sc->sc_queue, bio, bio_queue); + mtx_unlock(&sc->sc_queue_mtx); +} + +/* + * Releases delayed sync requests which don't collide anymore with regular + * requests. + */ +static void +g_mirror_sync_release(struct g_mirror_softc *sc) +{ + struct bio *bp, *bp2; + + TAILQ_FOREACH_SAFE(bp, &sc->sc_sync_delayed, bio_queue, bp2) { + if (g_mirror_regular_collision(sc, bp)) + continue; + TAILQ_REMOVE(&sc->sc_sync_delayed, bp, bio_queue); + G_MIRROR_LOGREQ(2, bp, + "Releasing delayed synchronization request."); + g_io_request(bp, bp->bio_from); + } +} + +/* + * Free a synchronization request and clear its slot in the array. + */ +static void +g_mirror_sync_request_free(struct g_mirror_disk *disk, struct bio *bp) +{ + int idx; + + if (disk != NULL && disk->d_sync.ds_bios != NULL) { + idx = (int)(uintptr_t)bp->bio_caller1; + KASSERT(disk->d_sync.ds_bios[idx] == bp, + ("unexpected sync BIO at %p:%d", disk, idx)); + disk->d_sync.ds_bios[idx] = NULL; + } + free(bp->bio_data, M_MIRROR); + g_destroy_bio(bp); +} + +/* + * Handle synchronization requests. + * Every synchronization request is a two-step process: first, a read request is + * sent to the mirror provider via the sync consumer. If that request completes + * successfully, it is converted to a write and sent to the disk being + * synchronized. If the write also completes successfully, the synchronization + * offset is advanced and a new read request is submitted. + */ +static void +g_mirror_sync_request(struct g_mirror_softc *sc, struct bio *bp) +{ + struct g_mirror_disk *disk; + struct g_mirror_disk_sync *sync; + + KASSERT((bp->bio_cmd == BIO_READ && + bp->bio_from->geom == sc->sc_sync.ds_geom) || + (bp->bio_cmd == BIO_WRITE && bp->bio_from->geom == sc->sc_geom), + ("Sync BIO %p with unexpected origin", bp)); + + bp->bio_from->index--; + disk = bp->bio_from->private; + if (disk == NULL) { + sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ + g_topology_lock(); + g_mirror_kill_consumer(sc, bp->bio_from); + g_topology_unlock(); + g_mirror_sync_request_free(NULL, bp); + sx_xlock(&sc->sc_lock); + return; + } + + sync = &disk->d_sync; + + /* + * Synchronization request. + */ + switch (bp->bio_cmd) { + case BIO_READ: { + struct g_consumer *cp; + + KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_sync_request_read, + bp->bio_error); + + if (bp->bio_error != 0) { + G_MIRROR_LOGREQ(0, bp, + "Synchronization request failed (error=%d).", + bp->bio_error); + + /* + * The read error will trigger a syncid bump, so there's + * no need to do that here. + * + * The read error handling for regular requests will + * retry the read from all active mirrors before passing + * the error back up, so there's no need to retry here. + */ + g_mirror_sync_request_free(disk, bp); + g_mirror_event_send(disk, + G_MIRROR_DISK_STATE_DISCONNECTED, + G_MIRROR_EVENT_DONTWAIT); + return; + } + G_MIRROR_LOGREQ(3, bp, + "Synchronization request half-finished."); + bp->bio_cmd = BIO_WRITE; + bp->bio_cflags = 0; + cp = disk->d_consumer; + KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, + ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, + cp->acr, cp->acw, cp->ace)); + cp->index++; + g_io_request(bp, cp); + return; + } + case BIO_WRITE: { + off_t offset; + int i; + + KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_sync_request_write, + bp->bio_error); + + if (bp->bio_error != 0) { + G_MIRROR_LOGREQ(0, bp, + "Synchronization request failed (error=%d).", + bp->bio_error); + g_mirror_sync_request_free(disk, bp); + sc->sc_bump_id |= G_MIRROR_BUMP_GENID; + g_mirror_event_send(disk, + G_MIRROR_DISK_STATE_DISCONNECTED, + G_MIRROR_EVENT_DONTWAIT); + return; + } + G_MIRROR_LOGREQ(3, bp, "Synchronization request finished."); + if (sync->ds_offset >= sc->sc_mediasize || + sync->ds_consumer == NULL || + (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { + /* Don't send more synchronization requests. */ + sync->ds_inflight--; + g_mirror_sync_request_free(disk, bp); + if (sync->ds_inflight > 0) + return; + if (sync->ds_consumer == NULL || + (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { + return; + } + /* Disk up-to-date, activate it. */ + g_mirror_event_send(disk, G_MIRROR_DISK_STATE_ACTIVE, + G_MIRROR_EVENT_DONTWAIT); + return; + } + + /* Send next synchronization request. */ + g_mirror_sync_reinit(disk, bp, sync->ds_offset); + sync->ds_offset += bp->bio_length; + + G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); + sync->ds_consumer->index++; + + /* + * Delay the request if it is colliding with a regular request. + */ + if (g_mirror_regular_collision(sc, bp)) + g_mirror_sync_delay(sc, bp); + else + g_io_request(bp, sync->ds_consumer); + + /* Requeue delayed requests if possible. */ + g_mirror_regular_release(sc); + + /* Find the smallest offset */ + offset = sc->sc_mediasize; + for (i = 0; i < g_mirror_syncreqs; i++) { + bp = sync->ds_bios[i]; + if (bp != NULL && bp->bio_offset < offset) + offset = bp->bio_offset; + } + if (g_mirror_sync_period > 0 && + time_uptime - sync->ds_update_ts > g_mirror_sync_period) { + sync->ds_offset_done = offset; + g_mirror_update_metadata(disk); + sync->ds_update_ts = time_uptime; + } + return; + } + default: + panic("Invalid I/O request %p", bp); + } +} + +static void +g_mirror_request_prefer(struct g_mirror_softc *sc, struct bio *bp) +{ + struct g_mirror_disk *disk; + struct g_consumer *cp; + struct bio *cbp; + + LIST_FOREACH(disk, &sc->sc_disks, d_next) { + if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE) + break; + } + if (disk == NULL) { + if (bp->bio_error == 0) + bp->bio_error = ENXIO; + g_io_deliver(bp, bp->bio_error); + return; + } + cbp = g_clone_bio(bp); + if (cbp == NULL) { + if (bp->bio_error == 0) + bp->bio_error = ENOMEM; + g_io_deliver(bp, bp->bio_error); + return; + } + /* + * Fill in the component buf structure. + */ + cp = disk->d_consumer; + cbp->bio_done = g_mirror_done; + cbp->bio_to = cp->provider; + G_MIRROR_LOGREQ(3, cbp, "Sending request."); + KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, + ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, + cp->acw, cp->ace)); + cp->index++; + g_io_request(cbp, cp); +} + +static void +g_mirror_request_round_robin(struct g_mirror_softc *sc, struct bio *bp) +{ + struct g_mirror_disk *disk; + struct g_consumer *cp; + struct bio *cbp; + + disk = g_mirror_get_disk(sc); + if (disk == NULL) { + if (bp->bio_error == 0) + bp->bio_error = ENXIO; + g_io_deliver(bp, bp->bio_error); + return; + } + cbp = g_clone_bio(bp); + if (cbp == NULL) { + if (bp->bio_error == 0) + bp->bio_error = ENOMEM; + g_io_deliver(bp, bp->bio_error); + return; + } + /* + * Fill in the component buf structure. + */ + cp = disk->d_consumer; + cbp->bio_done = g_mirror_done; + cbp->bio_to = cp->provider; + G_MIRROR_LOGREQ(3, cbp, "Sending request."); + KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, + ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, + cp->acw, cp->ace)); + cp->index++; + g_io_request(cbp, cp); +} + +#define TRACK_SIZE (1 * 1024 * 1024) +#define LOAD_SCALE 256 +#define ABS(x) (((x) >= 0) ? (x) : (-(x))) + +static void +g_mirror_request_load(struct g_mirror_softc *sc, struct bio *bp) +{ + struct g_mirror_disk *disk, *dp; + struct g_consumer *cp; + struct bio *cbp; + int prio, best; + + /* Find a disk with the smallest load. */ + disk = NULL; + best = INT_MAX; + LIST_FOREACH(dp, &sc->sc_disks, d_next) { + if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) + continue; + prio = dp->load; + /* If disk head is precisely in position - highly prefer it. */ + if (dp->d_last_offset == bp->bio_offset) + prio -= 2 * LOAD_SCALE; + else + /* If disk head is close to position - prefer it. */ + if (ABS(dp->d_last_offset - bp->bio_offset) < TRACK_SIZE) + prio -= 1 * LOAD_SCALE; + if (prio <= best) { + disk = dp; + best = prio; + } + } + KASSERT(disk != NULL, ("NULL disk for %s.", sc->sc_name)); + cbp = g_clone_bio(bp); + if (cbp == NULL) { + if (bp->bio_error == 0) + bp->bio_error = ENOMEM; + g_io_deliver(bp, bp->bio_error); + return; + } + /* + * Fill in the component buf structure. + */ + cp = disk->d_consumer; + cbp->bio_done = g_mirror_done; + cbp->bio_to = cp->provider; + G_MIRROR_LOGREQ(3, cbp, "Sending request."); + KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, + ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, + cp->acw, cp->ace)); + cp->index++; + /* Remember last head position */ + disk->d_last_offset = bp->bio_offset + bp->bio_length; + /* Update loads. */ + LIST_FOREACH(dp, &sc->sc_disks, d_next) { + dp->load = (dp->d_consumer->index * LOAD_SCALE + + dp->load * 7) / 8; + } + g_io_request(cbp, cp); +} + +static void +g_mirror_request_split(struct g_mirror_softc *sc, struct bio *bp) +{ + struct bio_queue queue; + struct g_mirror_disk *disk; + struct g_consumer *cp __diagused; + 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; + TAILQ_INIT(&queue); + LIST_FOREACH(disk, &sc->sc_disks, d_next) { + if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) + continue; + cbp = g_clone_bio(bp); + if (cbp == NULL) { + while ((cbp = TAILQ_FIRST(&queue)) != NULL) { + TAILQ_REMOVE(&queue, cbp, bio_queue); + g_destroy_bio(cbp); + } + if (bp->bio_error == 0) + bp->bio_error = ENOMEM; + g_io_deliver(bp, bp->bio_error); + return; + } + TAILQ_INSERT_TAIL(&queue, cbp, bio_queue); + cbp->bio_done = g_mirror_done; + cbp->bio_caller1 = disk; + cbp->bio_to = disk->d_consumer->provider; + cbp->bio_offset = offset; + cbp->bio_data = data; + cbp->bio_length = MIN(left, slice); + left -= cbp->bio_length; + if (left == 0) + break; + offset += cbp->bio_length; + data += cbp->bio_length; + } + while ((cbp = TAILQ_FIRST(&queue)) != NULL) { + TAILQ_REMOVE(&queue, cbp, bio_queue); + 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 g_mirror_softc *sc, struct bio *bp) +{ + struct bio_queue queue; + struct bio *cbp; + struct g_consumer *cp; + struct g_mirror_disk *disk; + + sx_assert(&sc->sc_lock, SA_XLOCKED); + + /* + * To avoid ordering issues, if a write is deferred because of a + * collision with a sync request, all I/O is deferred until that + * write is initiated. + */ + if (bp->bio_from->geom != sc->sc_sync.ds_geom && + !TAILQ_EMPTY(&sc->sc_regular_delayed)) { + g_mirror_regular_delay(sc, bp); + return; + } + + 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: + /* + * Delay the request if it is colliding with a synchronization + * request. + */ + if (g_mirror_sync_collision(sc, bp)) { + g_mirror_regular_delay(sc, bp); + return; + } + + if (sc->sc_idle) + g_mirror_unidle(sc); + else + sc->sc_last_write = time_uptime; + + /* + * Bump syncid on first write. + */ + if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) { + sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; + g_mirror_bump_syncid(sc); + } + + /* + * Allocate all bios before sending any request, so we can + * return ENOMEM in nice and clean way. + */ + TAILQ_INIT(&queue); + LIST_FOREACH(disk, &sc->sc_disks, d_next) { + switch (disk->d_state) { + case G_MIRROR_DISK_STATE_ACTIVE: + break; + case G_MIRROR_DISK_STATE_SYNCHRONIZING: + if (bp->bio_offset >= disk->d_sync.ds_offset) + continue; + break; + default: + continue; + } + if (bp->bio_cmd == BIO_DELETE && + (disk->d_flags & G_MIRROR_DISK_FLAG_CANDELETE) == 0) + continue; + cbp = g_clone_bio(bp); + if (cbp == NULL) { + while ((cbp = TAILQ_FIRST(&queue)) != NULL) { + TAILQ_REMOVE(&queue, cbp, bio_queue); + g_destroy_bio(cbp); + } + if (bp->bio_error == 0) + bp->bio_error = ENOMEM; + g_io_deliver(bp, bp->bio_error); + return; + } + TAILQ_INSERT_TAIL(&queue, cbp, bio_queue); + cbp->bio_done = g_mirror_done; + cp = disk->d_consumer; + cbp->bio_caller1 = cp; + cbp->bio_to = cp->provider; + KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, + ("Consumer %s not opened (r%dw%de%d).", + cp->provider->name, cp->acr, cp->acw, cp->ace)); + } + if (TAILQ_EMPTY(&queue)) { + KASSERT(bp->bio_cmd == BIO_DELETE, + ("No consumers for regular request %p", bp)); + g_io_deliver(bp, EOPNOTSUPP); + return; + } + while ((cbp = TAILQ_FIRST(&queue)) != NULL) { + G_MIRROR_LOGREQ(3, cbp, "Sending request."); + TAILQ_REMOVE(&queue, cbp, bio_queue); + cp = cbp->bio_caller1; + cbp->bio_caller1 = NULL; + cp->index++; + sc->sc_writes++; + g_io_request(cbp, cp); + } + /* + * Put request onto inflight queue, so we can check if new + * synchronization requests don't collide with it. + */ + TAILQ_INSERT_TAIL(&sc->sc_inflight, bp, bio_queue); + return; + case BIO_SPEEDUP: + case BIO_FLUSH: + TAILQ_INIT(&queue); + LIST_FOREACH(disk, &sc->sc_disks, d_next) { + if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) + continue; + cbp = g_clone_bio(bp); + if (cbp == NULL) { + while ((cbp = TAILQ_FIRST(&queue)) != NULL) { + TAILQ_REMOVE(&queue, cbp, bio_queue); + g_destroy_bio(cbp); + } + if (bp->bio_error == 0) + bp->bio_error = ENOMEM; + g_io_deliver(bp, bp->bio_error); + return; + } + TAILQ_INSERT_TAIL(&queue, cbp, bio_queue); + cbp->bio_done = g_mirror_done; + cbp->bio_caller1 = disk; + cbp->bio_to = disk->d_consumer->provider; + } + KASSERT(!TAILQ_EMPTY(&queue), + ("No consumers for regular request %p", bp)); + while ((cbp = TAILQ_FIRST(&queue)) != NULL) { + G_MIRROR_LOGREQ(3, cbp, "Sending request."); + TAILQ_REMOVE(&queue, cbp, bio_queue); + 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)); + cp->index++; + g_io_request(cbp, cp); + } + break; + default: + KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", + bp->bio_cmd, sc->sc_name)); + break; + } +} + +static int +g_mirror_can_destroy(struct g_mirror_softc *sc) +{ + struct g_geom *gp; + struct g_consumer *cp; + + g_topology_assert(); + gp = sc->sc_geom; + if (gp->softc == NULL) + return (1); + if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_TASTING) != 0) + return (0); + LIST_FOREACH(cp, &gp->consumer, consumer) { + if (g_mirror_is_busy(sc, cp)) + return (0); + } + gp = sc->sc_sync.ds_geom; + LIST_FOREACH(cp, &gp->consumer, consumer) { + if (g_mirror_is_busy(sc, cp)) + return (0); + } + G_MIRROR_DEBUG(2, "No I/O requests for %s, it can be destroyed.", + sc->sc_name); + return (1); +} + +static int +g_mirror_try_destroy(struct g_mirror_softc *sc) +{ + + if (sc->sc_rootmount != NULL) { + G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, + sc->sc_rootmount); + root_mount_rel(sc->sc_rootmount); + sc->sc_rootmount = NULL; + } + g_topology_lock(); + if (!g_mirror_can_destroy(sc)) { + g_topology_unlock(); + return (0); + } + sc->sc_geom->softc = NULL; + sc->sc_sync.ds_geom->softc = NULL; + if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DRAIN) != 0) { + g_topology_unlock(); + G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, + &sc->sc_worker); + /* Unlock sc_lock here, as it can be destroyed after wakeup. */ + sx_xunlock(&sc->sc_lock); + wakeup(&sc->sc_worker); + sc->sc_worker = NULL; + } else { + g_topology_unlock(); + g_mirror_destroy_device(sc); + } + return (1); +} + +/* + * Worker thread. + */ +static void +g_mirror_worker(void *arg) +{ + struct g_mirror_softc *sc; + struct g_mirror_event *ep; + struct bio *bp; + int timeout; + + sc = arg; + thread_lock(curthread); + sched_prio(curthread, PRIBIO); + thread_unlock(curthread); + + sx_xlock(&sc->sc_lock); + for (;;) { + G_MIRROR_DEBUG(5, "%s: Let's see...", __func__); + /* + * First take a look at events. + * This is important to handle events before any I/O requests. + */ + ep = g_mirror_event_first(sc); + if (ep != NULL) { + g_mirror_event_remove(sc, ep); + if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) { + /* Update only device status. */ + G_MIRROR_DEBUG(3, + "Running event for device %s.", + sc->sc_name); + ep->e_error = 0; + g_mirror_update_device(sc, true); + } else { + /* Update disk status. */ + G_MIRROR_DEBUG(3, "Running event for disk %s.", + g_mirror_get_diskname(ep->e_disk)); + ep->e_error = g_mirror_update_disk(ep->e_disk, + ep->e_state); + if (ep->e_error == 0) + g_mirror_update_device(sc, false); + } + if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) { + KASSERT(ep->e_error == 0, + ("Error cannot be handled.")); + g_mirror_event_free(ep); + } else { + ep->e_flags |= G_MIRROR_EVENT_DONE; + G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, + ep); + mtx_lock(&sc->sc_events_mtx); + wakeup(ep); + mtx_unlock(&sc->sc_events_mtx); + } + if ((sc->sc_flags & + G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { + if (g_mirror_try_destroy(sc)) { + curthread->td_pflags &= ~TDP_GEOM; + G_MIRROR_DEBUG(1, "Thread exiting."); + kproc_exit(0); + } + } + G_MIRROR_DEBUG(5, "%s: I'm here 1.", __func__); + continue; + } + + /* + * Check if we can mark array as CLEAN and if we can't take + * how much seconds should we wait. + */ + timeout = g_mirror_idle(sc, -1); + + /* + * Handle I/O requests. + */ + mtx_lock(&sc->sc_queue_mtx); + bp = TAILQ_FIRST(&sc->sc_queue); + if (bp != NULL) + TAILQ_REMOVE(&sc->sc_queue, bp, bio_queue); + else { + if ((sc->sc_flags & + G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { + mtx_unlock(&sc->sc_queue_mtx); + if (g_mirror_try_destroy(sc)) { + curthread->td_pflags &= ~TDP_GEOM; + G_MIRROR_DEBUG(1, "Thread exiting."); + kproc_exit(0); + } + mtx_lock(&sc->sc_queue_mtx); + if (!TAILQ_EMPTY(&sc->sc_queue)) { + mtx_unlock(&sc->sc_queue_mtx); + continue; + } + } + if (g_mirror_event_first(sc) != NULL) { + mtx_unlock(&sc->sc_queue_mtx); + continue; + } + sx_xunlock(&sc->sc_lock); + MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, "m:w1", + timeout * hz); + sx_xlock(&sc->sc_lock); + G_MIRROR_DEBUG(5, "%s: I'm here 4.", __func__); + continue; + } + mtx_unlock(&sc->sc_queue_mtx); + + if (bp->bio_from->geom == sc->sc_sync.ds_geom && + (bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) { + /* + * Handle completion of the first half (the read) of a + * block synchronization operation. + */ + g_mirror_sync_request(sc, bp); + } else if (bp->bio_to != sc->sc_provider) { + if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_REGULAR) != 0) + /* + * Handle completion of a regular I/O request. + */ + g_mirror_regular_request(sc, bp); + else if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) + /* + * Handle completion of the second half (the + * write) of a block synchronization operation. + */ + g_mirror_sync_request(sc, bp); + else { + KASSERT(0, + ("Invalid request cflags=0x%hx to=%s.", + bp->bio_cflags, bp->bio_to->name)); + } + } else { + /* + * Initiate an I/O request. + */ + g_mirror_register_request(sc, bp); + } + G_MIRROR_DEBUG(5, "%s: I'm here 9.", __func__); + } +} + +static void +g_mirror_update_idle(struct g_mirror_softc *sc, struct g_mirror_disk *disk) +{ + + sx_assert(&sc->sc_lock, SX_LOCKED); + + if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) + return; + if (!sc->sc_idle && (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0) { + G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as dirty.", + g_mirror_get_diskname(disk), sc->sc_name); + disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; + } else if (sc->sc_idle && + (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { + G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as clean.", + g_mirror_get_diskname(disk), sc->sc_name); + disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; + } +} + +static void +g_mirror_sync_reinit(const struct g_mirror_disk *disk, struct bio *bp, + off_t offset) +{ + void *data; + int idx; + + data = bp->bio_data; + idx = (int)(uintptr_t)bp->bio_caller1; + g_reset_bio(bp); + + bp->bio_cmd = BIO_READ; + bp->bio_data = data; + bp->bio_done = g_mirror_sync_done; + bp->bio_from = disk->d_sync.ds_consumer; + bp->bio_to = disk->d_softc->sc_provider; + bp->bio_caller1 = (void *)(uintptr_t)idx; + bp->bio_offset = offset; + bp->bio_length = MIN(maxphys, + disk->d_softc->sc_mediasize - bp->bio_offset); +} + +static void +g_mirror_sync_start(struct g_mirror_disk *disk) +{ + struct g_mirror_softc *sc; + struct g_mirror_disk_sync *sync; + struct g_consumer *cp; + struct bio *bp; + int error __diagused, i; + + g_topology_assert_not(); + sc = disk->d_softc; + sync = &disk->d_sync; + sx_assert(&sc->sc_lock, SX_LOCKED); + + KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, + ("Disk %s is not marked for synchronization.", + g_mirror_get_diskname(disk))); + KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, + ("Device not in RUNNING state (%s, %u).", sc->sc_name, + sc->sc_state)); + + sx_xunlock(&sc->sc_lock); + g_topology_lock(); + cp = g_new_consumer(sc->sc_sync.ds_geom); + cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; + error = g_attach(cp, sc->sc_provider); + KASSERT(error == 0, + ("Cannot attach to %s (error=%d).", sc->sc_name, error)); + error = g_access(cp, 1, 0, 0); + KASSERT(error == 0, ("Cannot open %s (error=%d).", sc->sc_name, error)); + g_topology_unlock(); + sx_xlock(&sc->sc_lock); + + G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s.", sc->sc_name, + g_mirror_get_diskname(disk)); + if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) == 0) + disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; + KASSERT(sync->ds_consumer == NULL, + ("Sync consumer already exists (device=%s, disk=%s).", + sc->sc_name, g_mirror_get_diskname(disk))); + + sync->ds_consumer = cp; + sync->ds_consumer->private = disk; + sync->ds_consumer->index = 0; + + /* + * Allocate memory for synchronization bios and initialize them. + */ + sync->ds_bios = malloc(sizeof(struct bio *) * g_mirror_syncreqs, + M_MIRROR, M_WAITOK); + for (i = 0; i < g_mirror_syncreqs; i++) { + bp = g_alloc_bio(); + sync->ds_bios[i] = bp; + + bp->bio_data = malloc(maxphys, M_MIRROR, M_WAITOK); + bp->bio_caller1 = (void *)(uintptr_t)i; + g_mirror_sync_reinit(disk, bp, sync->ds_offset); + sync->ds_offset += bp->bio_length; + } + + /* Increase the number of disks in SYNCHRONIZING state. */ + sc->sc_sync.ds_ndisks++; + /* Set the number of in-flight synchronization requests. */ + sync->ds_inflight = g_mirror_syncreqs; + + /* + * Fire off first synchronization requests. + */ + for (i = 0; i < g_mirror_syncreqs; i++) { + bp = sync->ds_bios[i]; + G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); + sync->ds_consumer->index++; + /* + * Delay the request if it is colliding with a regular request. + */ + if (g_mirror_regular_collision(sc, bp)) + g_mirror_sync_delay(sc, bp); + else + g_io_request(bp, sync->ds_consumer); + } +} + +/* + * Stop synchronization process. + * type: 0 - synchronization finished + * 1 - synchronization stopped + */ +static void +g_mirror_sync_stop(struct g_mirror_disk *disk, int type) +{ + struct g_mirror_softc *sc; + struct g_consumer *cp; + + g_topology_assert_not(); + sc = disk->d_softc; + sx_assert(&sc->sc_lock, SX_LOCKED); + + KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, + ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), + g_mirror_disk_state2str(disk->d_state))); + if (disk->d_sync.ds_consumer == NULL) + return; + + if (type == 0) { + G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s finished.", + sc->sc_name, g_mirror_get_diskname(disk)); + } else /* if (type == 1) */ { + G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s stopped.", + sc->sc_name, g_mirror_get_diskname(disk)); + } + g_mirror_regular_release(sc); + free(disk->d_sync.ds_bios, M_MIRROR); + disk->d_sync.ds_bios = NULL; + cp = disk->d_sync.ds_consumer; + disk->d_sync.ds_consumer = NULL; + disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; + sc->sc_sync.ds_ndisks--; + sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ + g_topology_lock(); + g_mirror_kill_consumer(sc, cp); + g_topology_unlock(); + sx_xlock(&sc->sc_lock); +} + +static void +g_mirror_launch_provider(struct g_mirror_softc *sc) +{ + struct g_mirror_disk *disk; + struct g_provider *pp, *dp; + + sx_assert(&sc->sc_lock, SX_LOCKED); + + g_topology_lock(); + pp = g_new_providerf(sc->sc_geom, "mirror/%s", sc->sc_name); + pp->flags |= G_PF_DIRECT_RECEIVE; + pp->mediasize = sc->sc_mediasize; + pp->sectorsize = sc->sc_sectorsize; + pp->stripesize = 0; + pp->stripeoffset = 0; + + /* Splitting of unmapped BIO's could work but isn't implemented now */ + if (sc->sc_balance != G_MIRROR_BALANCE_SPLIT) + pp->flags |= G_PF_ACCEPT_UNMAPPED; + + LIST_FOREACH(disk, &sc->sc_disks, d_next) { + if (disk->d_consumer && disk->d_consumer->provider) { + dp = disk->d_consumer->provider; + if (dp->stripesize > pp->stripesize) { + pp->stripesize = dp->stripesize; + pp->stripeoffset = dp->stripeoffset; + } + /* A provider underneath us doesn't support unmapped */ + if ((dp->flags & G_PF_ACCEPT_UNMAPPED) == 0) { + G_MIRROR_DEBUG(0, "Cancelling unmapped " + "because of %s.", dp->name); + pp->flags &= ~G_PF_ACCEPT_UNMAPPED; + } + } + } + pp->private = sc; + sc->sc_refcnt++; + sc->sc_provider = pp; + g_error_provider(pp, 0); + g_topology_unlock(); + G_MIRROR_DEBUG(0, "Device %s launched (%u/%u).", pp->name, + g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE), sc->sc_ndisks); + LIST_FOREACH(disk, &sc->sc_disks, d_next) { + if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) + g_mirror_sync_start(disk); + } +} + +static void +g_mirror_destroy_provider(struct g_mirror_softc *sc) +{ + struct g_mirror_disk *disk; + struct bio *bp; + + g_topology_assert_not(); + KASSERT(sc->sc_provider != NULL, ("NULL provider (device=%s).", + sc->sc_name)); + + LIST_FOREACH(disk, &sc->sc_disks, d_next) { + if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) + g_mirror_sync_stop(disk, 1); + } + + g_topology_lock(); + g_error_provider(sc->sc_provider, ENXIO); + mtx_lock(&sc->sc_queue_mtx); + while ((bp = TAILQ_FIRST(&sc->sc_queue)) != NULL) { + TAILQ_REMOVE(&sc->sc_queue, bp, bio_queue); + /* + * Abort any pending I/O that wasn't generated by us. + * Synchronization requests and requests destined for individual + * mirror components can be destroyed immediately. + */ + if (bp->bio_to == sc->sc_provider && + bp->bio_from->geom != sc->sc_sync.ds_geom) { + g_io_deliver(bp, ENXIO); + } else { + if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) + free(bp->bio_data, M_MIRROR); + g_destroy_bio(bp); + } + } + mtx_unlock(&sc->sc_queue_mtx); + g_wither_provider(sc->sc_provider, ENXIO); + sc->sc_provider = NULL; + G_MIRROR_DEBUG(0, "Device %s: provider destroyed.", sc->sc_name); + g_topology_unlock(); +} + +static void +g_mirror_go(void *arg) +{ + struct g_mirror_softc *sc; + struct g_mirror_event *ep; + + sc = arg; + G_MIRROR_DEBUG(0, "Force device %s start due to timeout.", sc->sc_name); + ep = sc->sc_timeout_event; + sc->sc_timeout_event = NULL; + g_mirror_event_dispatch(ep, sc, 0, + G_MIRROR_EVENT_DONTWAIT | G_MIRROR_EVENT_DEVICE); +} + +static void +g_mirror_timeout_drain(struct g_mirror_softc *sc) +{ + sx_assert(&sc->sc_lock, SX_XLOCKED); + + callout_drain(&sc->sc_callout); + g_mirror_event_free(sc->sc_timeout_event); + sc->sc_timeout_event = NULL; +} + +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 && + (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 0 || + (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0)) { + /* Disk does not need synchronization. */ + state = G_MIRROR_DISK_STATE_ACTIVE; + } else { + if ((sc->sc_flags & + G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || + (disk->d_flags & + G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { + /* + * We can start synchronization from + * the stored offset. + */ + state = G_MIRROR_DISK_STATE_SYNCHRONIZING; + } else { + state = G_MIRROR_DISK_STATE_STALE; + } + } + } else if (disk->d_sync.ds_syncid < sc->sc_syncid) { + /* + * Reset all synchronization data for this disk, + * because if it even was synchronized, it was + * synchronized to disks with different syncid. + */ + disk->d_flags |= G_MIRROR_DISK_FLAG_SYNCHRONIZING; + disk->d_sync.ds_offset = 0; + disk->d_sync.ds_offset_done = 0; + disk->d_sync.ds_syncid = sc->sc_syncid; + if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || + (disk->d_flags & G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { + state = G_MIRROR_DISK_STATE_SYNCHRONIZING; + } else { + state = G_MIRROR_DISK_STATE_STALE; + } + } else /* if (sc->sc_syncid < disk->d_sync.ds_syncid) */ { + /* + * Not good, NOT GOOD! + * It means that mirror was started on stale disks + * and more fresh disk just arrive. + * If there were writes, mirror is broken, sorry. + * I think the best choice here is don't touch + * this disk and inform the user loudly. + */ + G_MIRROR_DEBUG(0, "Device %s was started before the freshest " + "disk (%s) arrives!! It will not be connected to the " + "running device.", sc->sc_name, + g_mirror_get_diskname(disk)); + g_mirror_destroy_disk(disk); + state = G_MIRROR_DISK_STATE_NONE; + /* Return immediately, because disk was destroyed. */ + return (state); + } + G_MIRROR_DEBUG(3, "State for %s disk: %s.", + g_mirror_get_diskname(disk), g_mirror_disk_state2str(state)); + return (state); +} + +/* + * Update device state. + */ +static void +g_mirror_update_device(struct g_mirror_softc *sc, bool force) +{ + struct g_mirror_disk *disk; + u_int state; + + sx_assert(&sc->sc_lock, SX_XLOCKED); + + switch (sc->sc_state) { + case G_MIRROR_DEVICE_STATE_STARTING: + { + struct g_mirror_disk *pdisk, *tdisk; + const char *mismatch; + uintmax_t found, newest; + u_int dirty, ndisks; + + /* Pre-flight checks */ + LIST_FOREACH_SAFE(disk, &sc->sc_disks, d_next, tdisk) { + /* + * Confirm we already detected the newest genid. + */ + KASSERT(sc->sc_genid >= disk->d_genid, + ("%s: found newer genid %u (sc:%p had %u).", __func__, + disk->d_genid, sc, sc->sc_genid)); + + /* Kick out any previously tasted stale components. */ + if (disk->d_genid < sc->sc_genid) { + G_MIRROR_DEBUG(0, "Stale 'genid' field on %s " + "(device %s) (component=%u latest=%u), skipping.", + g_mirror_get_diskname(disk), sc->sc_name, + disk->d_genid, sc->sc_genid); + g_mirror_destroy_disk(disk); + sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; + continue; + } + + /* + * Confirm we already detected the newest syncid. + */ + KASSERT(sc->sc_syncid >= disk->d_sync.ds_syncid, + ("%s: found newer syncid %u (sc:%p had %u).", + __func__, disk->d_sync.ds_syncid, sc, + sc->sc_syncid)); + +#define DETECT_MISMATCH(field, name) \ + if (mismatch == NULL && \ + disk->d_init_ ## field != sc->sc_ ## field) { \ + mismatch = name; \ + found = (intmax_t)disk->d_init_ ## field; \ + newest = (intmax_t)sc->sc_ ## field; \ + } + mismatch = NULL; + DETECT_MISMATCH(ndisks, "md_all"); + DETECT_MISMATCH(balance, "md_balance"); + DETECT_MISMATCH(slice, "md_slice"); + DETECT_MISMATCH(mediasize, "md_mediasize"); +#undef DETECT_MISMATCH + if (mismatch != NULL) { + G_MIRROR_DEBUG(0, "Found a mismatching '%s' " + "field on %s (device %s) (found=%ju " + "newest=%ju).", mismatch, + g_mirror_get_diskname(disk), sc->sc_name, + found, newest); + g_mirror_destroy_disk(disk); + sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; + continue; + } + } + + KASSERT(sc->sc_provider == NULL, + ("Non-NULL provider in STARTING state (%s).", sc->sc_name)); + /* + * Are we ready? If the timeout (force is true) has expired, and + * any disks are present, then yes. If we're permitted to launch + * before the timeout has expired and the expected number of + * current-generation mirror disks have been tasted, then yes. + */ + ndisks = g_mirror_ndisks(sc, -1); + if ((force && ndisks > 0) || + (g_launch_mirror_before_timeout && ndisks == sc->sc_ndisks)) { + ; + } else if (ndisks == 0) { + /* + * Disks went down in starting phase, so destroy + * device. + */ + g_mirror_timeout_drain(sc); + sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; + G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, + sc->sc_rootmount); + root_mount_rel(sc->sc_rootmount); + sc->sc_rootmount = NULL; + return; + } else { + return; + } + + /* + * Activate all disks with the biggest syncid. + */ + if (force) { + /* + * If 'force' is true, we have been called due to + * timeout, so don't bother canceling timeout. + */ + ndisks = 0; + LIST_FOREACH(disk, &sc->sc_disks, d_next) { + if ((disk->d_flags & + G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { + ndisks++; + } + } + if (ndisks == 0) { + /* No valid disks found, destroy device. */ + sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; + G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", + __LINE__, sc->sc_rootmount); + root_mount_rel(sc->sc_rootmount); + sc->sc_rootmount = NULL; + return; + } + } else { + /* Cancel timeout. */ + g_mirror_timeout_drain(sc); + } + + /* + * 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 != sc->sc_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 != sc->sc_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 != sc->sc_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; + 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; + } + 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 usable disks, so destroy the device. + */ + sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; + break; + } else if (g_mirror_ndisks(sc, + G_MIRROR_DISK_STATE_ACTIVE) > 0 && + g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { + /* + * We have active disks, launch provider if it doesn't + * exist. + */ + if (sc->sc_provider == NULL) + g_mirror_launch_provider(sc); + if (sc->sc_rootmount != NULL) { + G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", + __LINE__, sc->sc_rootmount); + root_mount_rel(sc->sc_rootmount); + sc->sc_rootmount = NULL; + } + } + /* + * Genid should be bumped immediately, so do it here. + */ + if ((sc->sc_bump_id & G_MIRROR_BUMP_GENID) != 0) { + sc->sc_bump_id &= ~G_MIRROR_BUMP_GENID; + g_mirror_bump_genid(sc); + } + if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID_NOW) != 0) { + sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID_NOW; + g_mirror_bump_syncid(sc); + } + break; + default: + KASSERT(1 == 0, ("Wrong device state (%s, %s).", + sc->sc_name, g_mirror_device_state2str(sc->sc_state))); + break; + } +} + +/* + * Update disk state and device state if needed. + */ +#define DISK_STATE_CHANGED() G_MIRROR_DEBUG(1, \ + "Disk %s state changed from %s to %s (device %s).", \ + g_mirror_get_diskname(disk), \ + g_mirror_disk_state2str(disk->d_state), \ + g_mirror_disk_state2str(state), sc->sc_name) +static int +g_mirror_update_disk(struct g_mirror_disk *disk, u_int state) +{ + struct g_mirror_softc *sc; + + sc = disk->d_softc; + sx_assert(&sc->sc_lock, SX_XLOCKED); + +again: + G_MIRROR_DEBUG(3, "Changing disk %s state from %s to %s.", + g_mirror_get_diskname(disk), g_mirror_disk_state2str(disk->d_state), + g_mirror_disk_state2str(state)); + switch (state) { + case G_MIRROR_DISK_STATE_NEW: + /* + * Possible scenarios: + * 1. New disk arrive. + */ + /* Previous state should be NONE. */ + KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NONE, + ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), + g_mirror_disk_state2str(disk->d_state))); + DISK_STATE_CHANGED(); + + disk->d_state = state; + g_topology_lock(); + 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_topology_unlock(); + G_MIRROR_DEBUG(1, "Device %s: provider %s detected.", + sc->sc_name, g_mirror_get_diskname(disk)); + if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) + break; + KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, + ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, + g_mirror_device_state2str(sc->sc_state), + g_mirror_get_diskname(disk), + g_mirror_disk_state2str(disk->d_state))); + state = g_mirror_determine_state(disk); + if (state != G_MIRROR_DISK_STATE_NONE) + goto again; + break; + case G_MIRROR_DISK_STATE_ACTIVE: + /* + * Possible scenarios: + * 1. New disk does not need synchronization. + * 2. Synchronization process finished successfully. + */ + KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, + ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, + g_mirror_device_state2str(sc->sc_state), + g_mirror_get_diskname(disk), + g_mirror_disk_state2str(disk->d_state))); + /* Previous state should be NEW or SYNCHRONIZING. */ + KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW || + disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, + ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), + g_mirror_disk_state2str(disk->d_state))); + DISK_STATE_CHANGED(); + + if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { + disk->d_flags &= ~G_MIRROR_DISK_FLAG_SYNCHRONIZING; + disk->d_flags &= ~G_MIRROR_DISK_FLAG_FORCE_SYNC; + g_mirror_sync_stop(disk, 0); + } + disk->d_state = state; + disk->d_sync.ds_offset = 0; + disk->d_sync.ds_offset_done = 0; + g_mirror_update_idle(sc, disk); + g_mirror_update_metadata(disk); + G_MIRROR_DEBUG(1, "Device %s: provider %s activated.", + sc->sc_name, g_mirror_get_diskname(disk)); + break; + case G_MIRROR_DISK_STATE_STALE: + /* + * Possible scenarios: + * 1. Stale disk was connected. + */ + /* Previous state should be NEW. */ + KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, + ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), + g_mirror_disk_state2str(disk->d_state))); + KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, + ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, + g_mirror_device_state2str(sc->sc_state), + g_mirror_get_diskname(disk), + g_mirror_disk_state2str(disk->d_state))); + /* + * STALE state is only possible if device is marked + * NOAUTOSYNC. + */ + KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) != 0, + ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, + g_mirror_device_state2str(sc->sc_state), + g_mirror_get_diskname(disk), + g_mirror_disk_state2str(disk->d_state))); + DISK_STATE_CHANGED(); + + disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; + disk->d_state = state; + g_mirror_update_metadata(disk); + G_MIRROR_DEBUG(0, "Device %s: provider %s is stale.", + sc->sc_name, g_mirror_get_diskname(disk)); + break; + case G_MIRROR_DISK_STATE_SYNCHRONIZING: + /* + * Possible scenarios: + * 1. Disk which needs synchronization was connected. + */ + /* Previous state should be NEW. */ + KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, + ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), + g_mirror_disk_state2str(disk->d_state))); + KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, + ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, + g_mirror_device_state2str(sc->sc_state), + g_mirror_get_diskname(disk), + g_mirror_disk_state2str(disk->d_state))); + DISK_STATE_CHANGED(); + + if (disk->d_state == G_MIRROR_DISK_STATE_NEW) + disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; + disk->d_state = state; + if (sc->sc_provider != NULL) { + g_mirror_sync_start(disk); + g_mirror_update_metadata(disk); + } + break; + case G_MIRROR_DISK_STATE_DISCONNECTED: + /* + * Possible scenarios: + * 1. Device wasn't running yet, but disk disappear. + * 2. Disk was active and disapppear. + * 3. Disk disappear during synchronization process. + */ + if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING) { + /* + * Previous state should be ACTIVE, STALE or + * SYNCHRONIZING. + */ + KASSERT(disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || + disk->d_state == G_MIRROR_DISK_STATE_STALE || + disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, + ("Wrong disk state (%s, %s).", + g_mirror_get_diskname(disk), + g_mirror_disk_state2str(disk->d_state))); + } else if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) { + /* Previous state should be NEW. */ + KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, + ("Wrong disk state (%s, %s).", + g_mirror_get_diskname(disk), + g_mirror_disk_state2str(disk->d_state))); + /* + * Reset bumping syncid if disk disappeared in STARTING + * state. + */ + if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) + sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; +#ifdef INVARIANTS + } else { + KASSERT(1 == 0, ("Wrong device state (%s, %s, %s, %s).", + sc->sc_name, + g_mirror_device_state2str(sc->sc_state), + g_mirror_get_diskname(disk), + g_mirror_disk_state2str(disk->d_state))); +#endif + } + DISK_STATE_CHANGED(); + G_MIRROR_DEBUG(0, "Device %s: provider %s disconnected.", + sc->sc_name, g_mirror_get_diskname(disk)); + + g_mirror_destroy_disk(disk); + break; + case G_MIRROR_DISK_STATE_DESTROY: + { + int error; + + error = g_mirror_clear_metadata(disk); + if (error != 0) { + G_MIRROR_DEBUG(0, + "Device %s: failed to clear metadata on %s: %d.", + sc->sc_name, g_mirror_get_diskname(disk), error); + break; + } + DISK_STATE_CHANGED(); + G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", + sc->sc_name, g_mirror_get_diskname(disk)); + + g_mirror_destroy_disk(disk); + sc->sc_ndisks--; + LIST_FOREACH(disk, &sc->sc_disks, d_next) { + g_mirror_update_metadata(disk); + } + break; + } + default: + KASSERT(1 == 0, ("Unknown state (%u).", state)); + break; + } + return (0); +} +#undef DISK_STATE_CHANGED + +int +g_mirror_read_metadata(struct g_consumer *cp, struct g_mirror_metadata *md) +{ + struct g_provider *pp; + u_char *buf; + int error; + + g_topology_assert(); + + error = g_access(cp, 1, 0, 0); + if (error != 0) + return (error); + pp = cp->provider; + g_topology_unlock(); + /* Metadata are stored on last sector. */ + buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, + &error); + g_topology_lock(); + g_access(cp, -1, 0, 0); + if (buf == NULL) { + G_MIRROR_DEBUG(1, "Cannot read metadata from %s (error=%d).", + cp->provider->name, error); + return (error); + } + + /* Decode metadata. */ + error = mirror_metadata_decode(buf, md); + g_free(buf); + if (strcmp(md->md_magic, G_MIRROR_MAGIC) != 0) + return (EINVAL); + if (md->md_version > G_MIRROR_VERSION) { + G_MIRROR_DEBUG(0, + "Kernel module is too old to handle metadata from %s.", + cp->provider->name); + return (EINVAL); + } + if (error != 0) { + G_MIRROR_DEBUG(1, "MD5 metadata hash mismatch for provider %s.", + cp->provider->name); + return (error); + } + + return (0); +} + +static int +g_mirror_check_metadata(struct g_mirror_softc *sc, struct g_provider *pp, + struct g_mirror_metadata *md) +{ + + G_MIRROR_DEBUG(2, "%s: md_did 0x%u disk %s device %s md_all 0x%x " + "sc_ndisks 0x%x md_slice 0x%x sc_slice 0x%x md_balance 0x%x " + "sc_balance 0x%x sc_mediasize 0x%jx pp_mediasize 0x%jx " + "md_sectorsize 0x%x sc_sectorsize 0x%x md_mflags 0x%jx " + "md_dflags 0x%jx md_syncid 0x%x md_genid 0x%x md_priority 0x%x " + "sc_state 0x%x.", + __func__, md->md_did, pp->name, sc->sc_name, md->md_all, + sc->sc_ndisks, md->md_slice, sc->sc_slice, md->md_balance, + sc->sc_balance, (uintmax_t)sc->sc_mediasize, + (uintmax_t)pp->mediasize, md->md_sectorsize, sc->sc_sectorsize, + (uintmax_t)md->md_mflags, (uintmax_t)md->md_dflags, md->md_syncid, + md->md_genid, md->md_priority, sc->sc_state); + + 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 (sc->sc_mediasize > pp->mediasize) { + G_MIRROR_DEBUG(1, + "Invalid size of disk %s (device %s), skipping.", pp->name, + sc->sc_name); + return (EINVAL); + } + if (md->md_sectorsize != sc->sc_sectorsize) { + G_MIRROR_DEBUG(1, + "Invalid '%s' field on disk %s (device %s), skipping.", + "md_sectorsize", pp->name, sc->sc_name); + return (EINVAL); + } + if ((sc->sc_sectorsize % pp->sectorsize) != 0) { + G_MIRROR_DEBUG(1, + "Invalid sector size of disk %s (device %s), skipping.", + pp->name, sc->sc_name); + return (EINVAL); + } + if ((md->md_mflags & ~G_MIRROR_DEVICE_FLAG_MASK) != 0) { + G_MIRROR_DEBUG(1, + "Invalid device flags on disk %s (device %s), skipping.", + pp->name, sc->sc_name); + return (EINVAL); + } + if ((md->md_dflags & ~G_MIRROR_DISK_FLAG_MASK) != 0) { + G_MIRROR_DEBUG(1, + "Invalid disk flags on disk %s (device %s), skipping.", + pp->name, sc->sc_name); + return (EINVAL); + } + return (0); +} + +int +g_mirror_add_disk(struct g_mirror_softc *sc, struct g_provider *pp, + struct g_mirror_metadata *md) +{ + struct g_mirror_disk *disk; + int error; + + g_topology_assert_not(); + G_MIRROR_DEBUG(2, "Adding disk %s.", pp->name); + + error = g_mirror_check_metadata(sc, pp, md); + if (error != 0) + return (error); + + if (md->md_genid < sc->sc_genid) { + G_MIRROR_DEBUG(0, "Component %s (device %s) broken, skipping.", + pp->name, sc->sc_name); + return (EINVAL); + } + + /* + * If the component disk we're tasting has newer metadata than the + * STARTING gmirror device, refresh the device from the component. + */ + error = g_mirror_refresh_device(sc, pp, md); + if (error != 0) + return (error); + + disk = g_mirror_init_disk(sc, pp, md, &error); + if (disk == NULL) + return (error); + error = g_mirror_event_send(disk, G_MIRROR_DISK_STATE_NEW, + G_MIRROR_EVENT_WAIT); + if (error != 0) + return (error); + if (md->md_version < G_MIRROR_VERSION) { + G_MIRROR_DEBUG(0, "Upgrading metadata on %s (v%d->v%d).", + pp->name, md->md_version, G_MIRROR_VERSION); + g_mirror_update_metadata(disk); + } + return (0); +} + +static void +g_mirror_destroy_delayed(void *arg, int flag) +{ + struct g_mirror_softc *sc; + int error; + + if (flag == EV_CANCEL) { + G_MIRROR_DEBUG(1, "Destroying canceled."); + return; + } + sc = arg; + g_topology_unlock(); + sx_xlock(&sc->sc_lock); + KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) == 0, + ("DESTROY flag set on %s.", sc->sc_name)); + KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_CLOSEWAIT) != 0, + ("CLOSEWAIT flag not set on %s.", sc->sc_name)); + G_MIRROR_DEBUG(1, "Destroying %s (delayed).", sc->sc_name); + error = g_mirror_destroy(sc, G_MIRROR_DESTROY_SOFT); + if (error != 0) { + G_MIRROR_DEBUG(0, "Cannot destroy %s (error=%d).", + sc->sc_name, error); + sx_xunlock(&sc->sc_lock); + } + g_topology_lock(); +} + +static int +g_mirror_access(struct g_provider *pp, int acr, int acw, int ace) +{ + struct g_mirror_softc *sc; + int error = 0; + + g_topology_assert(); + G_MIRROR_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, acr, + acw, ace); + + sc = pp->private; + KASSERT(sc != NULL, ("NULL softc (provider=%s).", pp->name)); + + g_topology_unlock(); + sx_xlock(&sc->sc_lock); + if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0 || + (sc->sc_flags & G_MIRROR_DEVICE_FLAG_CLOSEWAIT) != 0 || + LIST_EMPTY(&sc->sc_disks)) { + if (acr > 0 || acw > 0 || ace > 0) + error = ENXIO; + goto end; + } + sc->sc_provider_open += acr + acw + ace; + if (pp->acw + acw == 0) + g_mirror_idle(sc, 0); + if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_CLOSEWAIT) != 0 && + sc->sc_provider_open == 0) + g_post_event(g_mirror_destroy_delayed, sc, M_WAITOK, sc, NULL); +end: + sx_xunlock(&sc->sc_lock); + g_topology_lock(); + return (error); +} + +static void +g_mirror_reinit_from_metadata(struct g_mirror_softc *sc, + const struct g_mirror_metadata *md) +{ + + sc->sc_genid = md->md_genid; + sc->sc_syncid = md->md_syncid; + + sc->sc_slice = md->md_slice; + sc->sc_balance = md->md_balance; + sc->sc_mediasize = md->md_mediasize; + sc->sc_ndisks = md->md_all; + sc->sc_flags &= ~G_MIRROR_DEVICE_FLAG_MASK; + sc->sc_flags |= (md->md_mflags & G_MIRROR_DEVICE_FLAG_MASK); +} + +struct g_geom * +g_mirror_create(struct g_class *mp, const struct g_mirror_metadata *md, + u_int type) +{ + struct g_mirror_softc *sc; + struct g_geom *gp; + int error, timeout; + + g_topology_assert(); + G_MIRROR_DEBUG(1, "Creating device %s (id=%u).", md->md_name, + md->md_mid); + + /* One disk is minimum. */ + if (md->md_all < 1) + return (NULL); + /* + * Action geom. + */ + gp = g_new_geom(mp, md->md_name); + sc = malloc(sizeof(*sc), M_MIRROR, M_WAITOK | M_ZERO); + gp->start = g_mirror_start; + gp->orphan = g_mirror_orphan; + gp->access = g_mirror_access; + gp->dumpconf = g_mirror_dumpconf; + + sc->sc_type = type; + sc->sc_id = md->md_mid; + g_mirror_reinit_from_metadata(sc, md); + sc->sc_sectorsize = md->md_sectorsize; + sc->sc_bump_id = 0; + sc->sc_idle = 1; + sc->sc_last_write = time_uptime; + sc->sc_writes = 0; + sc->sc_refcnt = 1; + sx_init(&sc->sc_lock, "gmirror:lock"); + TAILQ_INIT(&sc->sc_queue); + mtx_init(&sc->sc_queue_mtx, "gmirror:queue", NULL, MTX_DEF); + TAILQ_INIT(&sc->sc_regular_delayed); + TAILQ_INIT(&sc->sc_inflight); + TAILQ_INIT(&sc->sc_sync_delayed); + LIST_INIT(&sc->sc_disks); + TAILQ_INIT(&sc->sc_events); + mtx_init(&sc->sc_events_mtx, "gmirror:events", NULL, MTX_DEF); + callout_init(&sc->sc_callout, 1); + mtx_init(&sc->sc_done_mtx, "gmirror:done", NULL, MTX_DEF); + sc->sc_state = G_MIRROR_DEVICE_STATE_STARTING; + gp->softc = sc; + sc->sc_geom = gp; + sc->sc_provider = NULL; + sc->sc_provider_open = 0; + /* + * Synchronization geom. + */ + gp = g_new_geomf(mp, "%s.sync", md->md_name); + gp->softc = sc; + gp->orphan = g_mirror_orphan; + sc->sc_sync.ds_geom = gp; + sc->sc_sync.ds_ndisks = 0; + error = kproc_create(g_mirror_worker, sc, &sc->sc_worker, 0, 0, + "g_mirror %s", md->md_name); + if (error != 0) { + G_MIRROR_DEBUG(1, "Cannot create kernel thread for %s.", + sc->sc_name); + g_destroy_geom(sc->sc_sync.ds_geom); + g_destroy_geom(sc->sc_geom); + g_mirror_free_device(sc); + return (NULL); + } + + G_MIRROR_DEBUG(1, "Device %s created (%u components, id=%u).", + sc->sc_name, sc->sc_ndisks, sc->sc_id); + + sc->sc_rootmount = root_mount_hold("GMIRROR"); + G_MIRROR_DEBUG(1, "root_mount_hold %p", sc->sc_rootmount); + + /* + * Schedule startup timeout. + */ + timeout = g_mirror_timeout * hz; + sc->sc_timeout_event = malloc(sizeof(struct g_mirror_event), M_MIRROR, + M_WAITOK); + callout_reset(&sc->sc_callout, timeout, g_mirror_go, sc); + return (sc->sc_geom); +} + +int +g_mirror_destroy(struct g_mirror_softc *sc, int how) +{ + struct g_mirror_disk *disk; + + g_topology_assert_not(); + sx_assert(&sc->sc_lock, SX_XLOCKED); + + if (sc->sc_provider_open != 0) { + switch (how) { + case G_MIRROR_DESTROY_SOFT: + G_MIRROR_DEBUG(1, + "Device %s is still open (%d).", sc->sc_name, + sc->sc_provider_open); + return (EBUSY); + case G_MIRROR_DESTROY_DELAYED: + G_MIRROR_DEBUG(1, + "Device %s will be destroyed on last close.", + sc->sc_name); + LIST_FOREACH(disk, &sc->sc_disks, d_next) { + if (disk->d_state == + G_MIRROR_DISK_STATE_SYNCHRONIZING) { + g_mirror_sync_stop(disk, 1); + } + } + sc->sc_flags |= G_MIRROR_DEVICE_FLAG_CLOSEWAIT; + return (EBUSY); + case G_MIRROR_DESTROY_HARD: + G_MIRROR_DEBUG(1, "Device %s is still open, so it " + "can't be definitely removed.", sc->sc_name); + } + } + + if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { + sx_xunlock(&sc->sc_lock); + return (0); + } + sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; + sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DRAIN; + G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); + sx_xunlock(&sc->sc_lock); + mtx_lock(&sc->sc_queue_mtx); + wakeup(sc); + mtx_unlock(&sc->sc_queue_mtx); + G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, &sc->sc_worker); + while (sc->sc_worker != NULL) + tsleep(&sc->sc_worker, PRIBIO, "m:destroy", hz / 5); + G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, &sc->sc_worker); + sx_xlock(&sc->sc_lock); + g_mirror_destroy_device(sc); + return (0); +} + +static void +g_mirror_taste_orphan(struct g_consumer *cp) +{ + + KASSERT(1 == 0, ("%s called while tasting %s.", __func__, + cp->provider->name)); +} + +static struct g_geom * +g_mirror_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) +{ + struct g_mirror_metadata md; + struct g_mirror_softc *sc; + struct g_consumer *cp; + struct g_geom *gp; + int error; + + g_topology_assert(); + g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); + G_MIRROR_DEBUG(2, "Tasting %s.", pp->name); + + gp = g_new_geom(mp, "mirror:taste"); + /* + * This orphan function should be never called. + */ + gp->orphan = g_mirror_taste_orphan; + cp = g_new_consumer(gp); + cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; + error = g_attach(cp, pp); + if (error == 0) { + error = g_mirror_read_metadata(cp, &md); + g_detach(cp); + } + g_destroy_consumer(cp); + g_destroy_geom(gp); + if (error != 0) + return (NULL); + gp = NULL; + + if (md.md_provider[0] != '\0' && + !g_compare_names(md.md_provider, pp->name)) + return (NULL); + if (md.md_provsize != 0 && md.md_provsize != pp->mediasize) + return (NULL); + if ((md.md_dflags & G_MIRROR_DISK_FLAG_INACTIVE) != 0) { + G_MIRROR_DEBUG(0, + "Device %s: provider %s marked as inactive, skipping.", + md.md_name, pp->name); + return (NULL); + } + if (g_mirror_debug >= 2) + mirror_metadata_dump(&md); + + /* + * Let's check if device already exists. + */ + sc = NULL; + LIST_FOREACH(gp, &mp->geom, geom) { + sc = gp->softc; + if (sc == NULL) + continue; + if (sc->sc_type != G_MIRROR_TYPE_AUTOMATIC) + continue; + if (sc->sc_sync.ds_geom == gp) + continue; + if (strcmp(md.md_name, sc->sc_name) != 0) + continue; + if (md.md_mid != sc->sc_id) { + G_MIRROR_DEBUG(0, "Device %s already configured.", + sc->sc_name); + return (NULL); + } + break; + } + if (gp == NULL) { + gp = g_mirror_create(mp, &md, G_MIRROR_TYPE_AUTOMATIC); + if (gp == NULL) { + G_MIRROR_DEBUG(0, "Cannot create device %s.", + md.md_name); + return (NULL); + } + sc = gp->softc; + } + G_MIRROR_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name); + g_topology_unlock(); + sx_xlock(&sc->sc_lock); + sc->sc_flags |= G_MIRROR_DEVICE_FLAG_TASTING; + error = g_mirror_add_disk(sc, pp, &md); + sc->sc_flags &= ~G_MIRROR_DEVICE_FLAG_TASTING; + if (error != 0) { + G_MIRROR_DEBUG(0, "Cannot add disk %s to %s (error=%d).", + pp->name, gp->name, error); + if (LIST_EMPTY(&sc->sc_disks)) { + g_cancel_event(sc); + g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); + g_topology_lock(); + return (NULL); + } + gp = NULL; + } + if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { + g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); + g_topology_lock(); + return (NULL); + } + sx_xunlock(&sc->sc_lock); + g_topology_lock(); + return (gp); +} + +static void +g_mirror_resize(struct g_consumer *cp) +{ + struct g_mirror_disk *disk; + + g_topology_assert(); + g_trace(G_T_TOPOLOGY, "%s(%s)", __func__, cp->provider->name); + + disk = cp->private; + if (disk == NULL) + return; + g_topology_unlock(); + g_mirror_update_metadata(disk); + g_topology_lock(); +} + +static int +g_mirror_destroy_geom(struct gctl_req *req __unused, + struct g_class *mp __unused, struct g_geom *gp) +{ + struct g_mirror_softc *sc; + int error; + + g_topology_unlock(); + sc = gp->softc; + sx_xlock(&sc->sc_lock); + g_cancel_event(sc); + error = g_mirror_destroy(gp->softc, G_MIRROR_DESTROY_SOFT); + if (error != 0) + sx_xunlock(&sc->sc_lock); + g_topology_lock(); + return (error); +} + +static void +g_mirror_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, + struct g_consumer *cp, struct g_provider *pp) +{ + struct g_mirror_softc *sc; + + g_topology_assert(); + + sc = gp->softc; + if (sc == NULL) + return; + /* Skip synchronization geom. */ + if (gp == sc->sc_sync.ds_geom) + return; + if (pp != NULL) { + /* Nothing here. */ + } else if (cp != NULL) { + struct g_mirror_disk *disk; + + disk = cp->private; + if (disk == NULL) + return; + sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)disk->d_id); + if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { + sbuf_printf(sb, "%s<Synchronized>", indent); + if (disk->d_sync.ds_offset == 0) + sbuf_cat(sb, "0%"); + else + sbuf_printf(sb, "%u%%", + (u_int)((disk->d_sync.ds_offset * 100) / + sc->sc_mediasize)); + sbuf_cat(sb, "</Synchronized>\n"); + if (disk->d_sync.ds_offset > 0) + sbuf_printf(sb, "%s<BytesSynced>%jd" + "</BytesSynced>\n", indent, + (intmax_t)disk->d_sync.ds_offset); + } + sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, + disk->d_sync.ds_syncid); + sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, + disk->d_genid); + sbuf_printf(sb, "%s<Flags>", indent); + if (disk->d_flags == 0) + sbuf_cat(sb, "NONE"); + else { + int first = 1; + +#define ADD_FLAG(flag, name) do { \ + if ((disk->d_flags & (flag)) != 0) { \ + if (!first) \ + sbuf_cat(sb, ", "); \ + else \ + first = 0; \ + sbuf_cat(sb, name); \ + } \ +} while (0) + ADD_FLAG(G_MIRROR_DISK_FLAG_DIRTY, "DIRTY"); + ADD_FLAG(G_MIRROR_DISK_FLAG_HARDCODED, "HARDCODED"); + ADD_FLAG(G_MIRROR_DISK_FLAG_INACTIVE, "INACTIVE"); + ADD_FLAG(G_MIRROR_DISK_FLAG_SYNCHRONIZING, + "SYNCHRONIZING"); + ADD_FLAG(G_MIRROR_DISK_FLAG_FORCE_SYNC, "FORCE_SYNC"); + ADD_FLAG(G_MIRROR_DISK_FLAG_BROKEN, "BROKEN"); +#undef ADD_FLAG + } + sbuf_cat(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<Type>", indent); + switch (sc->sc_type) { + case G_MIRROR_TYPE_AUTOMATIC: + sbuf_cat(sb, "AUTOMATIC"); + break; + case G_MIRROR_TYPE_MANUAL: + sbuf_cat(sb, "MANUAL"); + break; + default: + sbuf_cat(sb, "UNKNOWN"); + break; + } + sbuf_cat(sb, "</Type>\n"); + sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id); + sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, sc->sc_syncid); + sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, sc->sc_genid); + sbuf_printf(sb, "%s<Flags>", indent); + if (sc->sc_flags == 0) + sbuf_cat(sb, "NONE"); + else { + int first = 1; + +#define ADD_FLAG(flag, name) do { \ + if ((sc->sc_flags & (flag)) != 0) { \ + if (!first) \ + sbuf_cat(sb, ", "); \ + else \ + first = 0; \ + sbuf_cat(sb, name); \ + } \ +} while (0) + ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOFAILSYNC, "NOFAILSYNC"); + ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOAUTOSYNC, "NOAUTOSYNC"); +#undef ADD_FLAG + } + sbuf_cat(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_cat(sb, "</State>\n"); + } +} + +static void +g_mirror_shutdown_post_sync(void *arg, int howto) +{ + struct g_class *mp; + struct g_geom *gp, *gp2; + struct g_mirror_softc *sc; + int error; + + if ((howto & RB_NOSYNC) != 0) + return; + + mp = arg; + g_topology_lock(); + g_mirror_shutdown = 1; + LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { + if ((sc = gp->softc) == NULL) + continue; + /* Skip synchronization geom. */ + if (gp == sc->sc_sync.ds_geom) + continue; + g_topology_unlock(); + sx_xlock(&sc->sc_lock); + g_mirror_idle(sc, -1); + g_cancel_event(sc); + error = g_mirror_destroy(sc, G_MIRROR_DESTROY_DELAYED); + if (error != 0) + sx_xunlock(&sc->sc_lock); + g_topology_lock(); + } + g_topology_unlock(); +} + +static void +g_mirror_init(struct g_class *mp) +{ + + g_mirror_post_sync = EVENTHANDLER_REGISTER(shutdown_post_sync, + g_mirror_shutdown_post_sync, mp, SHUTDOWN_PRI_FIRST); + if (g_mirror_post_sync == NULL) + G_MIRROR_DEBUG(0, "Warning! Cannot register shutdown event."); +} + +static void +g_mirror_fini(struct g_class *mp) +{ + + if (g_mirror_post_sync != NULL) + EVENTHANDLER_DEREGISTER(shutdown_post_sync, g_mirror_post_sync); +} + +/* + * Refresh the mirror device's metadata when gmirror encounters a newer + * generation as the individual components are being added to the mirror set. + */ +static int +g_mirror_refresh_device(struct g_mirror_softc *sc, const struct g_provider *pp, + const struct g_mirror_metadata *md) +{ + + g_topology_assert_not(); + sx_assert(&sc->sc_lock, SX_XLOCKED); + + KASSERT(sc->sc_genid <= md->md_genid, + ("%s: attempted to refresh from stale component %s (device %s) " + "(%u < %u).", __func__, pp->name, sc->sc_name, md->md_genid, + sc->sc_genid)); + + if (sc->sc_genid > md->md_genid || (sc->sc_genid == md->md_genid && + sc->sc_syncid >= md->md_syncid)) + return (0); + + G_MIRROR_DEBUG(0, "Found newer version for device %s (genid: curr=%u " + "new=%u; syncid: curr=%u new=%u; ndisks: curr=%u new=%u; " + "provider=%s).", sc->sc_name, sc->sc_genid, md->md_genid, + sc->sc_syncid, md->md_syncid, sc->sc_ndisks, md->md_all, pp->name); + + if (sc->sc_state != G_MIRROR_DEVICE_STATE_STARTING) { + /* Probable data corruption detected */ + G_MIRROR_DEBUG(0, "Cannot refresh metadata in %s state " + "(device=%s genid=%u). A stale mirror device was launched.", + g_mirror_device_state2str(sc->sc_state), sc->sc_name, + sc->sc_genid); + return (EINVAL); + } + + /* Update softc */ + g_mirror_reinit_from_metadata(sc, md); + + G_MIRROR_DEBUG(1, "Refresh device %s (id=%u, state=%s) from disk %s " + "(genid=%u syncid=%u md_all=%u).", sc->sc_name, md->md_mid, + g_mirror_device_state2str(sc->sc_state), pp->name, md->md_genid, + md->md_syncid, (unsigned)md->md_all); + + return (0); +} + +DECLARE_GEOM_CLASS(g_mirror_class, g_mirror); +MODULE_VERSION(geom_mirror, 0); |