diff options
Diffstat (limited to 'sys/geom/raid/tr_raid1e.c')
| -rw-r--r-- | sys/geom/raid/tr_raid1e.c | 1227 |
1 files changed, 1227 insertions, 0 deletions
diff --git a/sys/geom/raid/tr_raid1e.c b/sys/geom/raid/tr_raid1e.c new file mode 100644 index 0000000..9ebe218 --- /dev/null +++ b/sys/geom/raid/tr_raid1e.c @@ -0,0 +1,1227 @@ +/*- + * Copyright (c) 2010 Alexander Motin <mav@FreeBSD.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/bio.h> +#include <sys/endian.h> +#include <sys/kernel.h> +#include <sys/kobj.h> +#include <sys/limits.h> +#include <sys/lock.h> +#include <sys/malloc.h> +#include <sys/mutex.h> +#include <sys/sysctl.h> +#include <sys/systm.h> +#include <geom/geom.h> +#include "geom/raid/g_raid.h" +#include "g_raid_tr_if.h" + +#define N 2 + +SYSCTL_DECL(_kern_geom_raid); +SYSCTL_NODE(_kern_geom_raid, OID_AUTO, raid1e, CTLFLAG_RW, 0, + "RAID1E parameters"); + +#define RAID1E_REBUILD_SLAB (1 << 20) /* One transation in a rebuild */ +static int g_raid1e_rebuild_slab = RAID1E_REBUILD_SLAB; +TUNABLE_INT("kern.geom.raid.raid1e.rebuild_slab_size", + &g_raid1e_rebuild_slab); +SYSCTL_UINT(_kern_geom_raid_raid1e, OID_AUTO, rebuild_slab_size, CTLFLAG_RW, + &g_raid1e_rebuild_slab, 0, + "Amount of the disk to rebuild each read/write cycle of the rebuild."); + +#define RAID1E_REBUILD_FAIR_IO 20 /* use 1/x of the available I/O */ +static int g_raid1e_rebuild_fair_io = RAID1E_REBUILD_FAIR_IO; +TUNABLE_INT("kern.geom.raid.raid1e.rebuild_fair_io", + &g_raid1e_rebuild_fair_io); +SYSCTL_UINT(_kern_geom_raid_raid1e, OID_AUTO, rebuild_fair_io, CTLFLAG_RW, + &g_raid1e_rebuild_fair_io, 0, + "Fraction of the I/O bandwidth to use when disk busy for rebuild."); + +#define RAID1E_REBUILD_CLUSTER_IDLE 100 +static int g_raid1e_rebuild_cluster_idle = RAID1E_REBUILD_CLUSTER_IDLE; +TUNABLE_INT("kern.geom.raid.raid1e.rebuild_cluster_idle", + &g_raid1e_rebuild_cluster_idle); +SYSCTL_UINT(_kern_geom_raid_raid1e, OID_AUTO, rebuild_cluster_idle, CTLFLAG_RW, + &g_raid1e_rebuild_cluster_idle, 0, + "Number of slabs to do each time we trigger a rebuild cycle"); + +#define RAID1E_REBUILD_META_UPDATE 1024 /* update meta data every 1GB or so */ +static int g_raid1e_rebuild_meta_update = RAID1E_REBUILD_META_UPDATE; +TUNABLE_INT("kern.geom.raid.raid1e.rebuild_meta_update", + &g_raid1e_rebuild_meta_update); +SYSCTL_UINT(_kern_geom_raid_raid1e, OID_AUTO, rebuild_meta_update, CTLFLAG_RW, + &g_raid1e_rebuild_meta_update, 0, + "When to update the meta data."); + +static MALLOC_DEFINE(M_TR_RAID1E, "tr_raid1e_data", "GEOM_RAID RAID1E data"); + +#define TR_RAID1E_NONE 0 +#define TR_RAID1E_REBUILD 1 +#define TR_RAID1E_RESYNC 2 + +#define TR_RAID1E_F_DOING_SOME 0x1 +#define TR_RAID1E_F_LOCKED 0x2 +#define TR_RAID1E_F_ABORT 0x4 + +struct g_raid_tr_raid1e_object { + struct g_raid_tr_object trso_base; + int trso_starting; + int trso_stopping; + int trso_type; + int trso_recover_slabs; /* slabs before rest */ + int trso_fair_io; + int trso_meta_update; + int trso_flags; + struct g_raid_subdisk *trso_failed_sd; /* like per volume */ + void *trso_buffer; /* Buffer space */ + off_t trso_lock_pos; /* Locked range start. */ + off_t trso_lock_len; /* Locked range length. */ + struct bio trso_bio; +}; + +static g_raid_tr_taste_t g_raid_tr_taste_raid1e; +static g_raid_tr_event_t g_raid_tr_event_raid1e; +static g_raid_tr_start_t g_raid_tr_start_raid1e; +static g_raid_tr_stop_t g_raid_tr_stop_raid1e; +static g_raid_tr_iostart_t g_raid_tr_iostart_raid1e; +static g_raid_tr_iodone_t g_raid_tr_iodone_raid1e; +static g_raid_tr_kerneldump_t g_raid_tr_kerneldump_raid1e; +static g_raid_tr_locked_t g_raid_tr_locked_raid1e; +static g_raid_tr_idle_t g_raid_tr_idle_raid1e; +static g_raid_tr_free_t g_raid_tr_free_raid1e; + +static kobj_method_t g_raid_tr_raid1e_methods[] = { + KOBJMETHOD(g_raid_tr_taste, g_raid_tr_taste_raid1e), + KOBJMETHOD(g_raid_tr_event, g_raid_tr_event_raid1e), + KOBJMETHOD(g_raid_tr_start, g_raid_tr_start_raid1e), + KOBJMETHOD(g_raid_tr_stop, g_raid_tr_stop_raid1e), + KOBJMETHOD(g_raid_tr_iostart, g_raid_tr_iostart_raid1e), + KOBJMETHOD(g_raid_tr_iodone, g_raid_tr_iodone_raid1e), + KOBJMETHOD(g_raid_tr_kerneldump, g_raid_tr_kerneldump_raid1e), + KOBJMETHOD(g_raid_tr_locked, g_raid_tr_locked_raid1e), + KOBJMETHOD(g_raid_tr_idle, g_raid_tr_idle_raid1e), + KOBJMETHOD(g_raid_tr_free, g_raid_tr_free_raid1e), + { 0, 0 } +}; + +static struct g_raid_tr_class g_raid_tr_raid1e_class = { + "RAID1E", + g_raid_tr_raid1e_methods, + sizeof(struct g_raid_tr_raid1e_object), + .trc_priority = 200 +}; + +static void g_raid_tr_raid1e_rebuild_abort(struct g_raid_tr_object *tr); +static void g_raid_tr_raid1e_maybe_rebuild(struct g_raid_tr_object *tr, + struct g_raid_subdisk *sd); +static int g_raid_tr_raid1e_select_read_disk(struct g_raid_volume *vol, + int no, off_t off, off_t len, u_int mask); + +static inline void +V2P(struct g_raid_volume *vol, off_t virt, + int *disk, off_t *offset, off_t *start) +{ + off_t nstrip; + u_int strip_size; + + strip_size = vol->v_strip_size; + /* Strip number. */ + nstrip = virt / strip_size; + /* Start position in strip. */ + *start = virt % strip_size; + /* Disk number. */ + *disk = (nstrip * N) % vol->v_disks_count; + /* Strip start position in disk. */ + *offset = ((nstrip * N) / vol->v_disks_count) * strip_size; +} + +static inline void +P2V(struct g_raid_volume *vol, int disk, off_t offset, + off_t *virt, int *copy) +{ + off_t nstrip, start; + u_int strip_size; + + strip_size = vol->v_strip_size; + /* Start position in strip. */ + start = offset % strip_size; + /* Physical strip number. */ + nstrip = (offset / strip_size) * vol->v_disks_count + disk; + /* Number of physical strip (copy) inside virtual strip. */ + *copy = nstrip % N; + /* Offset in virtual space. */ + *virt = (nstrip / N) * strip_size + start; +} + +static int +g_raid_tr_taste_raid1e(struct g_raid_tr_object *tr, struct g_raid_volume *vol) +{ + struct g_raid_tr_raid1e_object *trs; + + trs = (struct g_raid_tr_raid1e_object *)tr; + if (tr->tro_volume->v_raid_level != G_RAID_VOLUME_RL_RAID1E || + tr->tro_volume->v_raid_level_qualifier != G_RAID_VOLUME_RLQ_NONE) + return (G_RAID_TR_TASTE_FAIL); + trs->trso_starting = 1; + return (G_RAID_TR_TASTE_SUCCEED); +} + +static int +g_raid_tr_update_state_raid1e_even(struct g_raid_volume *vol) +{ + struct g_raid_tr_raid1e_object *trs; + struct g_raid_softc *sc; + struct g_raid_subdisk *sd, *bestsd, *worstsd; + int i, j, state, sstate; + + sc = vol->v_softc; + trs = (struct g_raid_tr_raid1e_object *)vol->v_tr; + state = G_RAID_VOLUME_S_OPTIMAL; + for (i = 0; i < vol->v_disks_count / N; i++) { + bestsd = &vol->v_subdisks[i * N]; + for (j = 1; j < N; j++) { + sd = &vol->v_subdisks[i * N + j]; + if (sd->sd_state > bestsd->sd_state) + bestsd = sd; + else if (sd->sd_state == bestsd->sd_state && + (sd->sd_state == G_RAID_SUBDISK_S_REBUILD || + sd->sd_state == G_RAID_SUBDISK_S_RESYNC) && + sd->sd_rebuild_pos > bestsd->sd_rebuild_pos) + bestsd = sd; + } + if (bestsd->sd_state >= G_RAID_SUBDISK_S_UNINITIALIZED && + bestsd->sd_state != G_RAID_SUBDISK_S_ACTIVE) { + /* We found reasonable candidate. */ + G_RAID_DEBUG1(1, sc, + "Promote subdisk %s:%d from %s to ACTIVE.", + vol->v_name, bestsd->sd_pos, + g_raid_subdisk_state2str(bestsd->sd_state)); + g_raid_change_subdisk_state(bestsd, + G_RAID_SUBDISK_S_ACTIVE); + g_raid_write_metadata(sc, + vol, bestsd, bestsd->sd_disk); + } + worstsd = &vol->v_subdisks[i * N]; + for (j = 1; j < N; j++) { + sd = &vol->v_subdisks[i * N + j]; + if (sd->sd_state < worstsd->sd_state) + worstsd = sd; + } + if (worstsd->sd_state == G_RAID_SUBDISK_S_ACTIVE) + sstate = G_RAID_VOLUME_S_OPTIMAL; + else if (worstsd->sd_state >= G_RAID_SUBDISK_S_STALE) + sstate = G_RAID_VOLUME_S_SUBOPTIMAL; + else if (bestsd->sd_state == G_RAID_SUBDISK_S_ACTIVE) + sstate = G_RAID_VOLUME_S_DEGRADED; + else + sstate = G_RAID_VOLUME_S_BROKEN; + if (sstate < state) + state = sstate; + } + return (state); +} + +static int +g_raid_tr_update_state_raid1e_odd(struct g_raid_volume *vol) +{ + struct g_raid_tr_raid1e_object *trs; + struct g_raid_softc *sc; + struct g_raid_subdisk *sd, *bestsd, *worstsd; + int i, j, state, sstate; + + sc = vol->v_softc; + trs = (struct g_raid_tr_raid1e_object *)vol->v_tr; + if (g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_ACTIVE) == + vol->v_disks_count) + return (G_RAID_VOLUME_S_OPTIMAL); + for (i = 0; i < vol->v_disks_count; i++) { + sd = &vol->v_subdisks[i]; + if (sd->sd_state == G_RAID_SUBDISK_S_UNINITIALIZED) { + /* We found reasonable candidate. */ + G_RAID_DEBUG1(1, sc, + "Promote subdisk %s:%d from %s to STALE.", + vol->v_name, sd->sd_pos, + g_raid_subdisk_state2str(sd->sd_state)); + g_raid_change_subdisk_state(sd, + G_RAID_SUBDISK_S_STALE); + g_raid_write_metadata(sc, vol, sd, sd->sd_disk); + } + } + state = G_RAID_VOLUME_S_OPTIMAL; + for (i = 0; i < vol->v_disks_count; i++) { + bestsd = &vol->v_subdisks[i]; + worstsd = &vol->v_subdisks[i]; + for (j = 1; j < N; j++) { + sd = &vol->v_subdisks[(i + j) % vol->v_disks_count]; + if (sd->sd_state > bestsd->sd_state) + bestsd = sd; + else if (sd->sd_state == bestsd->sd_state && + (sd->sd_state == G_RAID_SUBDISK_S_REBUILD || + sd->sd_state == G_RAID_SUBDISK_S_RESYNC) && + sd->sd_rebuild_pos > bestsd->sd_rebuild_pos) + bestsd = sd; + if (sd->sd_state < worstsd->sd_state) + worstsd = sd; + } + if (worstsd->sd_state == G_RAID_SUBDISK_S_ACTIVE) + sstate = G_RAID_VOLUME_S_OPTIMAL; + else if (worstsd->sd_state >= G_RAID_SUBDISK_S_STALE) + sstate = G_RAID_VOLUME_S_SUBOPTIMAL; + else if (bestsd->sd_state >= G_RAID_SUBDISK_S_STALE) + sstate = G_RAID_VOLUME_S_DEGRADED; + else + sstate = G_RAID_VOLUME_S_BROKEN; + if (sstate < state) + state = sstate; + } + return (state); +} + +static int +g_raid_tr_update_state_raid1e(struct g_raid_volume *vol, + struct g_raid_subdisk *sd) +{ + struct g_raid_tr_raid1e_object *trs; + struct g_raid_softc *sc; + u_int s; + + sc = vol->v_softc; + trs = (struct g_raid_tr_raid1e_object *)vol->v_tr; + if (trs->trso_stopping && + (trs->trso_flags & TR_RAID1E_F_DOING_SOME) == 0) + s = G_RAID_VOLUME_S_STOPPED; + else if (trs->trso_starting) + s = G_RAID_VOLUME_S_STARTING; + else { + if ((vol->v_disks_count % N) == 0) + s = g_raid_tr_update_state_raid1e_even(vol); + else + s = g_raid_tr_update_state_raid1e_odd(vol); + } + if (s != vol->v_state) { + g_raid_event_send(vol, G_RAID_VOLUME_S_ALIVE(s) ? + G_RAID_VOLUME_E_UP : G_RAID_VOLUME_E_DOWN, + G_RAID_EVENT_VOLUME); + g_raid_change_volume_state(vol, s); + if (!trs->trso_starting && !trs->trso_stopping) + g_raid_write_metadata(sc, vol, NULL, NULL); + } + if (!trs->trso_starting && !trs->trso_stopping) + g_raid_tr_raid1e_maybe_rebuild(vol->v_tr, sd); + return (0); +} + +static void +g_raid_tr_raid1e_fail_disk(struct g_raid_softc *sc, struct g_raid_subdisk *sd, + struct g_raid_disk *disk) +{ + /* + * We don't fail the last disk in the pack, since it still has decent + * data on it and that's better than failing the disk if it is the root + * file system. + * + * XXX should this be controlled via a tunable? It makes sense for + * the volume that has / on it. I can't think of a case where we'd + * want the volume to go away on this kind of event. + */ + if (g_raid_nsubdisks(sd->sd_volume, G_RAID_SUBDISK_S_ACTIVE) == 1 && + g_raid_get_subdisk(sd->sd_volume, G_RAID_SUBDISK_S_ACTIVE) == sd) + return; + g_raid_fail_disk(sc, sd, disk); +} + +static void +g_raid_tr_raid1e_rebuild_done(struct g_raid_tr_raid1e_object *trs) +{ + struct g_raid_volume *vol; + struct g_raid_subdisk *sd; + + vol = trs->trso_base.tro_volume; + sd = trs->trso_failed_sd; + g_raid_write_metadata(vol->v_softc, vol, sd, sd->sd_disk); + free(trs->trso_buffer, M_TR_RAID1E); + trs->trso_buffer = NULL; + trs->trso_flags &= ~TR_RAID1E_F_DOING_SOME; + trs->trso_type = TR_RAID1E_NONE; + trs->trso_recover_slabs = 0; + trs->trso_failed_sd = NULL; + g_raid_tr_update_state_raid1e(vol, NULL); +} + +static void +g_raid_tr_raid1e_rebuild_finish(struct g_raid_tr_object *tr) +{ + struct g_raid_tr_raid1e_object *trs; + struct g_raid_subdisk *sd; + + trs = (struct g_raid_tr_raid1e_object *)tr; + sd = trs->trso_failed_sd; + G_RAID_DEBUG1(0, tr->tro_volume->v_softc, + "Subdisk %s:%d-%s rebuild completed.", + sd->sd_volume->v_name, sd->sd_pos, + sd->sd_disk ? g_raid_get_diskname(sd->sd_disk) : "[none]"); + g_raid_change_subdisk_state(sd, G_RAID_SUBDISK_S_ACTIVE); + sd->sd_rebuild_pos = 0; + g_raid_tr_raid1e_rebuild_done(trs); +} + +static void +g_raid_tr_raid1e_rebuild_abort(struct g_raid_tr_object *tr) +{ + struct g_raid_tr_raid1e_object *trs; + struct g_raid_subdisk *sd; + struct g_raid_volume *vol; + + vol = tr->tro_volume; + trs = (struct g_raid_tr_raid1e_object *)tr; + sd = trs->trso_failed_sd; + if (trs->trso_flags & TR_RAID1E_F_DOING_SOME) { + G_RAID_DEBUG1(1, vol->v_softc, + "Subdisk %s:%d-%s rebuild is aborting.", + sd->sd_volume->v_name, sd->sd_pos, + sd->sd_disk ? g_raid_get_diskname(sd->sd_disk) : "[none]"); + trs->trso_flags |= TR_RAID1E_F_ABORT; + } else { + G_RAID_DEBUG1(0, vol->v_softc, + "Subdisk %s:%d-%s rebuild aborted.", + sd->sd_volume->v_name, sd->sd_pos, + sd->sd_disk ? g_raid_get_diskname(sd->sd_disk) : "[none]"); + trs->trso_flags &= ~TR_RAID1E_F_ABORT; + if (trs->trso_flags & TR_RAID1E_F_LOCKED) { + trs->trso_flags &= ~TR_RAID1E_F_LOCKED; + g_raid_unlock_range(tr->tro_volume, + trs->trso_lock_pos, trs->trso_lock_len); + } + g_raid_tr_raid1e_rebuild_done(trs); + } +} + +static void +g_raid_tr_raid1e_rebuild_some(struct g_raid_tr_object *tr) +{ + struct g_raid_tr_raid1e_object *trs; + struct g_raid_softc *sc; + struct g_raid_volume *vol; + struct g_raid_subdisk *sd; + struct bio *bp; + off_t len, virtual, vend, offset, start; + int disk, copy, best; + + trs = (struct g_raid_tr_raid1e_object *)tr; + if (trs->trso_flags & TR_RAID1E_F_DOING_SOME) + return; + vol = tr->tro_volume; + sc = vol->v_softc; + sd = trs->trso_failed_sd; + + while (1) { + if (sd->sd_rebuild_pos >= sd->sd_size) { + g_raid_tr_raid1e_rebuild_finish(tr); + return; + } + /* Get virtual offset from physical rebuild position. */ + P2V(vol, sd->sd_pos, sd->sd_rebuild_pos, &virtual, ©); + /* Get physical offset back to get first stripe position. */ + V2P(vol, virtual, &disk, &offset, &start); + /* Calculate contignous data length. */ + len = MIN(g_raid1e_rebuild_slab, + sd->sd_size - sd->sd_rebuild_pos); + if ((vol->v_disks_count % N) != 0) + len = MIN(len, vol->v_strip_size - start); + /* Find disk with most accurate data. */ + best = g_raid_tr_raid1e_select_read_disk(vol, disk, + offset + start, len, 0); + if (best < 0) { + /* There is no any valid disk. */ + g_raid_tr_raid1e_rebuild_abort(tr); + return; + } else if (best != copy) { + /* Some other disk has better data. */ + break; + } + /* We have the most accurate data. Skip the range. */ + G_RAID_DEBUG1(3, sc, "Skipping rebuild for range %ju - %ju", + sd->sd_rebuild_pos, sd->sd_rebuild_pos + len); + sd->sd_rebuild_pos += len; + } + + bp = &trs->trso_bio; + memset(bp, 0, sizeof(*bp)); + bp->bio_offset = offset + start + + ((disk + best >= vol->v_disks_count) ? vol->v_strip_size : 0); + bp->bio_length = len; + bp->bio_data = trs->trso_buffer; + bp->bio_cmd = BIO_READ; + bp->bio_cflags = G_RAID_BIO_FLAG_SYNC; + bp->bio_caller1 = &vol->v_subdisks[(disk + best) % vol->v_disks_count]; + G_RAID_LOGREQ(3, bp, "Queueing rebuild read"); + /* + * If we are crossing stripe boundary, correct affected virtual + * range we should lock. + */ + if (start + len > vol->v_strip_size) { + P2V(vol, sd->sd_pos, sd->sd_rebuild_pos + len, &vend, ©); + len = vend - virtual; + } + trs->trso_flags |= TR_RAID1E_F_DOING_SOME; + trs->trso_flags |= TR_RAID1E_F_LOCKED; + trs->trso_lock_pos = virtual; + trs->trso_lock_len = len; + /* Lock callback starts I/O */ + g_raid_lock_range(sd->sd_volume, virtual, len, NULL, bp); +} + +static void +g_raid_tr_raid1e_rebuild_start(struct g_raid_tr_object *tr) +{ + struct g_raid_volume *vol; + struct g_raid_tr_raid1e_object *trs; + struct g_raid_subdisk *sd; + + vol = tr->tro_volume; + trs = (struct g_raid_tr_raid1e_object *)tr; + if (trs->trso_failed_sd) { + G_RAID_DEBUG1(1, vol->v_softc, + "Already rebuild in start rebuild. pos %jd\n", + (intmax_t)trs->trso_failed_sd->sd_rebuild_pos); + return; + } + sd = g_raid_get_subdisk(vol, G_RAID_SUBDISK_S_RESYNC); + if (sd == NULL) + sd = g_raid_get_subdisk(vol, G_RAID_SUBDISK_S_REBUILD); + if (sd == NULL) { + sd = g_raid_get_subdisk(vol, G_RAID_SUBDISK_S_STALE); + if (sd != NULL) { + sd->sd_rebuild_pos = 0; + g_raid_change_subdisk_state(sd, + G_RAID_SUBDISK_S_RESYNC); + g_raid_write_metadata(vol->v_softc, vol, sd, NULL); + } else { + sd = g_raid_get_subdisk(vol, + G_RAID_SUBDISK_S_UNINITIALIZED); + if (sd == NULL) + sd = g_raid_get_subdisk(vol, + G_RAID_SUBDISK_S_NEW); + if (sd != NULL) { + sd->sd_rebuild_pos = 0; + g_raid_change_subdisk_state(sd, + G_RAID_SUBDISK_S_REBUILD); + g_raid_write_metadata(vol->v_softc, + vol, sd, NULL); + } + } + } + if (sd == NULL) { + G_RAID_DEBUG1(1, vol->v_softc, + "No failed disk to rebuild. night night."); + return; + } + trs->trso_failed_sd = sd; + G_RAID_DEBUG1(0, vol->v_softc, + "Subdisk %s:%d-%s rebuild start at %jd.", + sd->sd_volume->v_name, sd->sd_pos, + sd->sd_disk ? g_raid_get_diskname(sd->sd_disk) : "[none]", + trs->trso_failed_sd->sd_rebuild_pos); + trs->trso_type = TR_RAID1E_REBUILD; + trs->trso_buffer = malloc(g_raid1e_rebuild_slab, M_TR_RAID1E, M_WAITOK); + trs->trso_meta_update = g_raid1e_rebuild_meta_update; + g_raid_tr_raid1e_rebuild_some(tr); +} + +static void +g_raid_tr_raid1e_maybe_rebuild(struct g_raid_tr_object *tr, + struct g_raid_subdisk *sd) +{ + struct g_raid_volume *vol; + struct g_raid_tr_raid1e_object *trs; + int nr; + + vol = tr->tro_volume; + trs = (struct g_raid_tr_raid1e_object *)tr; + if (trs->trso_stopping) + return; + nr = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_REBUILD) + + g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_RESYNC); + switch(trs->trso_type) { + case TR_RAID1E_NONE: + if (vol->v_state < G_RAID_VOLUME_S_DEGRADED) + return; + if (nr == 0) { + nr = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_NEW) + + g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_STALE) + + g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_UNINITIALIZED); + if (nr == 0) + return; + } + g_raid_tr_raid1e_rebuild_start(tr); + break; + case TR_RAID1E_REBUILD: + if (vol->v_state < G_RAID_VOLUME_S_DEGRADED || nr == 0 || + trs->trso_failed_sd == sd) + g_raid_tr_raid1e_rebuild_abort(tr); + break; + case TR_RAID1E_RESYNC: + break; + } +} + +static int +g_raid_tr_event_raid1e(struct g_raid_tr_object *tr, + struct g_raid_subdisk *sd, u_int event) +{ + + g_raid_tr_update_state_raid1e(tr->tro_volume, sd); + return (0); +} + +static int +g_raid_tr_start_raid1e(struct g_raid_tr_object *tr) +{ + struct g_raid_tr_raid1e_object *trs; + struct g_raid_volume *vol; + + trs = (struct g_raid_tr_raid1e_object *)tr; + vol = tr->tro_volume; + trs->trso_starting = 0; + g_raid_tr_update_state_raid1e(vol, NULL); + return (0); +} + +static int +g_raid_tr_stop_raid1e(struct g_raid_tr_object *tr) +{ + struct g_raid_tr_raid1e_object *trs; + struct g_raid_volume *vol; + + trs = (struct g_raid_tr_raid1e_object *)tr; + vol = tr->tro_volume; + trs->trso_starting = 0; + trs->trso_stopping = 1; + g_raid_tr_update_state_raid1e(vol, NULL); + return (0); +} + +/* + * Select the disk to read from. Take into account: subdisk state, running + * error recovery, average disk load, head position and possible cache hits. + */ +#define ABS(x) (((x) >= 0) ? (x) : (-(x))) +static int +g_raid_tr_raid1e_select_read_disk(struct g_raid_volume *vol, + int no, off_t off, off_t len, u_int mask) +{ + struct g_raid_subdisk *sd; + off_t offset; + int i, best, prio, bestprio; + + best = -1; + bestprio = INT_MAX; + for (i = 0; i < N; i++) { + sd = &vol->v_subdisks[(no + i) % vol->v_disks_count]; + offset = off; + if (no + i >= vol->v_disks_count) + offset += vol->v_strip_size; + + prio = G_RAID_SUBDISK_LOAD(sd); + if ((mask & (1 << sd->sd_pos)) != 0) + continue; + switch (sd->sd_state) { + case G_RAID_SUBDISK_S_ACTIVE: + break; + case G_RAID_SUBDISK_S_RESYNC: + if (offset + off < sd->sd_rebuild_pos) + break; + /* FALLTHROUGH */ + case G_RAID_SUBDISK_S_STALE: + prio += i << 24; + break; + case G_RAID_SUBDISK_S_REBUILD: + if (offset + off < sd->sd_rebuild_pos) + break; + /* FALLTHROUGH */ + default: + continue; + } + prio += min(sd->sd_recovery, 255) << 16; + /* If disk head is precisely in position - highly prefer it. */ + if (G_RAID_SUBDISK_POS(sd) == offset) + prio -= 2 * G_RAID_SUBDISK_LOAD_SCALE; + else + /* If disk head is close to position - prefer it. */ + if (ABS(G_RAID_SUBDISK_POS(sd) - offset) < + G_RAID_SUBDISK_TRACK_SIZE) + prio -= 1 * G_RAID_SUBDISK_LOAD_SCALE; + if (prio < bestprio) { + bestprio = prio; + best = i; + } + } + return (best); +} + +static void +g_raid_tr_iostart_raid1e_read(struct g_raid_tr_object *tr, struct bio *bp) +{ + struct g_raid_volume *vol; + struct g_raid_subdisk *sd; + struct bio_queue_head queue; + struct bio *cbp; + char *addr; + off_t offset, start, length, remain; + u_int no, strip_size; + int best; + + vol = tr->tro_volume; + addr = bp->bio_data; + strip_size = vol->v_strip_size; + V2P(vol, bp->bio_offset, &no, &offset, &start); + remain = bp->bio_length; + bioq_init(&queue); + while (remain > 0) { + length = MIN(strip_size - start, remain); + best = g_raid_tr_raid1e_select_read_disk(vol, + no, offset, length, 0); + KASSERT(best >= 0, ("No readable disk in volume %s!", + vol->v_name)); + no += best; + if (no >= vol->v_disks_count) { + no -= vol->v_disks_count; + offset += strip_size; + } + cbp = g_clone_bio(bp); + if (cbp == NULL) + goto failure; + cbp->bio_offset = offset + start; + cbp->bio_data = addr; + cbp->bio_length = length; + cbp->bio_caller1 = &vol->v_subdisks[no]; + bioq_insert_tail(&queue, cbp); + no += N - best; + if (no >= vol->v_disks_count) { + no -= vol->v_disks_count; + offset += strip_size; + } + remain -= length; + addr += length; + start = 0; + } + for (cbp = bioq_first(&queue); cbp != NULL; + cbp = bioq_first(&queue)) { + bioq_remove(&queue, cbp); + sd = cbp->bio_caller1; + cbp->bio_caller1 = NULL; + g_raid_subdisk_iostart(sd, cbp); + } + return; +failure: + for (cbp = bioq_first(&queue); cbp != NULL; + cbp = bioq_first(&queue)) { + bioq_remove(&queue, cbp); + g_destroy_bio(cbp); + } + if (bp->bio_error == 0) + bp->bio_error = ENOMEM; + g_raid_iodone(bp, bp->bio_error); +} + +static void +g_raid_tr_iostart_raid1e_write(struct g_raid_tr_object *tr, struct bio *bp) +{ + struct g_raid_volume *vol; + struct g_raid_subdisk *sd; + struct bio_queue_head queue; + struct bio *cbp; + char *addr; + off_t offset, start, length, remain; + u_int no, strip_size; + int i; + + vol = tr->tro_volume; + addr = bp->bio_data; + strip_size = vol->v_strip_size; + V2P(vol, bp->bio_offset, &no, &offset, &start); + remain = bp->bio_length; + bioq_init(&queue); + while (remain > 0) { + length = MIN(strip_size - start, remain); + for (i = 0; i < N; i++) { + sd = &vol->v_subdisks[no]; + switch (sd->sd_state) { + case G_RAID_SUBDISK_S_ACTIVE: + case G_RAID_SUBDISK_S_STALE: + case G_RAID_SUBDISK_S_RESYNC: + break; + case G_RAID_SUBDISK_S_REBUILD: + if (offset + start >= sd->sd_rebuild_pos) + goto nextdisk; + break; + default: + goto nextdisk; + } + cbp = g_clone_bio(bp); + if (cbp == NULL) + goto failure; + cbp->bio_offset = offset + start; + cbp->bio_data = addr; + cbp->bio_length = length; + cbp->bio_caller1 = sd; + bioq_insert_tail(&queue, cbp); +nextdisk: + if (++no >= vol->v_disks_count) { + no = 0; + offset += strip_size; + } + } + remain -= length; + addr += length; + start = 0; + } + for (cbp = bioq_first(&queue); cbp != NULL; + cbp = bioq_first(&queue)) { + bioq_remove(&queue, cbp); + sd = cbp->bio_caller1; + cbp->bio_caller1 = NULL; + g_raid_subdisk_iostart(sd, cbp); + } + return; +failure: + for (cbp = bioq_first(&queue); cbp != NULL; + cbp = bioq_first(&queue)) { + bioq_remove(&queue, cbp); + g_destroy_bio(cbp); + } + if (bp->bio_error == 0) + bp->bio_error = ENOMEM; + g_raid_iodone(bp, bp->bio_error); +} + +static void +g_raid_tr_iostart_raid1e(struct g_raid_tr_object *tr, struct bio *bp) +{ + struct g_raid_volume *vol; + struct g_raid_tr_raid1e_object *trs; + + vol = tr->tro_volume; + trs = (struct g_raid_tr_raid1e_object *)tr; + if (vol->v_state != G_RAID_VOLUME_S_OPTIMAL && + vol->v_state != G_RAID_VOLUME_S_SUBOPTIMAL && + vol->v_state != G_RAID_VOLUME_S_DEGRADED) { + g_raid_iodone(bp, EIO); + return; + } + /* + * If we're rebuilding, squeeze in rebuild activity every so often, + * even when the disk is busy. Be sure to only count real I/O + * to the disk. All 'SPECIAL' I/O is traffic generated to the disk + * by this module. + */ + if (trs->trso_failed_sd != NULL && + !(bp->bio_cflags & G_RAID_BIO_FLAG_SPECIAL)) { + /* Make this new or running now round short. */ + trs->trso_recover_slabs = 0; + if (--trs->trso_fair_io <= 0) { + trs->trso_fair_io = g_raid1e_rebuild_fair_io; + g_raid_tr_raid1e_rebuild_some(tr); + } + } + switch (bp->bio_cmd) { + case BIO_READ: + g_raid_tr_iostart_raid1e_read(tr, bp); + break; + case BIO_WRITE: + g_raid_tr_iostart_raid1e_write(tr, bp); + break; + case BIO_DELETE: + g_raid_iodone(bp, EIO); + break; + case BIO_FLUSH: + g_raid_tr_flush_common(tr, bp); + break; + default: + KASSERT(1 == 0, ("Invalid command here: %u (volume=%s)", + bp->bio_cmd, vol->v_name)); + break; + } +} + +static void +g_raid_tr_iodone_raid1e(struct g_raid_tr_object *tr, + struct g_raid_subdisk *sd, struct bio *bp) +{ + struct bio *cbp; + struct g_raid_subdisk *nsd; + struct g_raid_volume *vol; + struct bio *pbp; + struct g_raid_tr_raid1e_object *trs; + off_t virtual, offset, start; + uintptr_t mask; + int error, do_write, copy, disk, best; + + trs = (struct g_raid_tr_raid1e_object *)tr; + vol = tr->tro_volume; + if (bp->bio_cflags & G_RAID_BIO_FLAG_SYNC) { + if (trs->trso_type == TR_RAID1E_REBUILD) { + nsd = trs->trso_failed_sd; + if (bp->bio_cmd == BIO_READ) { + + /* Immediately abort rebuild, if requested. */ + if (trs->trso_flags & TR_RAID1E_F_ABORT) { + trs->trso_flags &= ~TR_RAID1E_F_DOING_SOME; + g_raid_tr_raid1e_rebuild_abort(tr); + return; + } + + /* On read error, skip and cross fingers. */ + if (bp->bio_error != 0) { + G_RAID_LOGREQ(0, bp, + "Read error during rebuild (%d), " + "possible data loss!", + bp->bio_error); + goto rebuild_round_done; + } + + /* + * The read operation finished, queue the + * write and get out. + */ + G_RAID_LOGREQ(3, bp, "Rebuild read done: %d", + bp->bio_error); + bp->bio_cmd = BIO_WRITE; + bp->bio_cflags = G_RAID_BIO_FLAG_SYNC; + bp->bio_offset = nsd->sd_rebuild_pos; + G_RAID_LOGREQ(3, bp, "Queueing rebuild write."); + g_raid_subdisk_iostart(nsd, bp); + } else { + /* + * The write operation just finished. Do + * another. We keep cloning the master bio + * since it has the right buffers allocated to + * it. + */ + G_RAID_LOGREQ(3, bp, "Rebuild write done: %d", + bp->bio_error); + if (bp->bio_error != 0 || + trs->trso_flags & TR_RAID1E_F_ABORT) { + if ((trs->trso_flags & + TR_RAID1E_F_ABORT) == 0) { + g_raid_tr_raid1e_fail_disk(sd->sd_softc, + nsd, nsd->sd_disk); + } + trs->trso_flags &= ~TR_RAID1E_F_DOING_SOME; + g_raid_tr_raid1e_rebuild_abort(tr); + return; + } +rebuild_round_done: + trs->trso_flags &= ~TR_RAID1E_F_LOCKED; + g_raid_unlock_range(tr->tro_volume, + trs->trso_lock_pos, trs->trso_lock_len); + nsd->sd_rebuild_pos += bp->bio_length; + if (nsd->sd_rebuild_pos >= nsd->sd_size) { + g_raid_tr_raid1e_rebuild_finish(tr); + return; + } + + /* Abort rebuild if we are stopping */ + if (trs->trso_stopping) { + trs->trso_flags &= ~TR_RAID1E_F_DOING_SOME; + g_raid_tr_raid1e_rebuild_abort(tr); + return; + } + + if (--trs->trso_meta_update <= 0) { + g_raid_write_metadata(vol->v_softc, + vol, nsd, nsd->sd_disk); + trs->trso_meta_update = + g_raid1e_rebuild_meta_update; + /* Compensate short rebuild I/Os. */ + if ((vol->v_disks_count % N) != 0 && + vol->v_strip_size < + g_raid1e_rebuild_slab) { + trs->trso_meta_update *= + g_raid1e_rebuild_slab; + trs->trso_meta_update /= + vol->v_strip_size; + } + } + trs->trso_flags &= ~TR_RAID1E_F_DOING_SOME; + if (--trs->trso_recover_slabs <= 0) + return; + /* Run next rebuild iteration. */ + g_raid_tr_raid1e_rebuild_some(tr); + } + } else if (trs->trso_type == TR_RAID1E_RESYNC) { + /* + * read good sd, read bad sd in parallel. when both + * done, compare the buffers. write good to the bad + * if different. do the next bit of work. + */ + panic("Somehow, we think we're doing a resync"); + } + return; + } + pbp = bp->bio_parent; + pbp->bio_inbed++; + mask = (intptr_t)bp->bio_caller2; + if (bp->bio_cmd == BIO_READ && bp->bio_error != 0) { + /* + * Read failed on first drive. Retry the read error on + * another disk drive, if available, before erroring out the + * read. + */ + sd->sd_disk->d_read_errs++; + G_RAID_LOGREQ(0, bp, + "Read error (%d), %d read errors total", + bp->bio_error, sd->sd_disk->d_read_errs); + + /* + * If there are too many read errors, we move to degraded. + * XXX Do we want to FAIL the drive (eg, make the user redo + * everything to get it back in sync), or just degrade the + * drive, which kicks off a resync? + */ + do_write = 0; + if (sd->sd_disk->d_read_errs > g_raid_read_err_thresh) + g_raid_tr_raid1e_fail_disk(sd->sd_softc, sd, sd->sd_disk); + else if (mask == 0) + do_write = 1; + + /* Restore what we were doing. */ + P2V(vol, sd->sd_pos, bp->bio_offset, &virtual, ©); + V2P(vol, virtual, &disk, &offset, &start); + + /* Find the other disk, and try to do the I/O to it. */ + mask |= 1 << copy; + best = g_raid_tr_raid1e_select_read_disk(vol, + disk, offset, start, mask); + if (best >= 0 && (cbp = g_clone_bio(pbp)) != NULL) { + disk += best; + if (disk >= vol->v_disks_count) { + disk -= vol->v_disks_count; + offset += vol->v_strip_size; + } + cbp->bio_offset = offset + start; + cbp->bio_length = bp->bio_length; + cbp->bio_data = bp->bio_data; + g_destroy_bio(bp); + nsd = &vol->v_subdisks[disk]; + G_RAID_LOGREQ(2, cbp, "Retrying read from %d", + nsd->sd_pos); + if (do_write) + mask |= 1 << 31; + if ((mask & (1 << 31)) != 0) + sd->sd_recovery++; + cbp->bio_caller2 = (void *)mask; + if (do_write) { + cbp->bio_caller1 = nsd; + /* Lock callback starts I/O */ + g_raid_lock_range(sd->sd_volume, + virtual, cbp->bio_length, pbp, cbp); + } else { + g_raid_subdisk_iostart(nsd, cbp); + } + return; + } + /* + * We can't retry. Return the original error by falling + * through. This will happen when there's only one good disk. + * We don't need to fail the raid, since its actual state is + * based on the state of the subdisks. + */ + G_RAID_LOGREQ(2, bp, "Couldn't retry read, failing it"); + } + if (bp->bio_cmd == BIO_READ && + bp->bio_error == 0 && + (mask & (1 << 31)) != 0) { + G_RAID_LOGREQ(3, bp, "Recovered data from other drive"); + + /* Restore what we were doing. */ + P2V(vol, sd->sd_pos, bp->bio_offset, &virtual, ©); + V2P(vol, virtual, &disk, &offset, &start); + + /* Find best disk to write. */ + best = g_raid_tr_raid1e_select_read_disk(vol, + disk, offset, start, ~mask); + if (best >= 0 && (cbp = g_clone_bio(pbp)) != NULL) { + disk += best; + if (disk >= vol->v_disks_count) { + disk -= vol->v_disks_count; + offset += vol->v_strip_size; + } + cbp->bio_offset = offset + start; + cbp->bio_length = bp->bio_length; + cbp->bio_data = bp->bio_data; + cbp->bio_cmd = BIO_WRITE; + cbp->bio_cflags = G_RAID_BIO_FLAG_REMAP; + cbp->bio_caller2 = (void *)mask; + g_destroy_bio(bp); + G_RAID_LOGREQ(2, cbp, + "Attempting bad sector remap on failing drive."); + g_raid_subdisk_iostart(&vol->v_subdisks[disk], cbp); + return; + } + } + if ((mask & (1 << 31)) != 0) { + /* + * We're done with a recovery, mark the range as unlocked. + * For any write errors, we agressively fail the disk since + * there was both a READ and a WRITE error at this location. + * Both types of errors generally indicates the drive is on + * the verge of total failure anyway. Better to stop trusting + * it now. However, we need to reset error to 0 in that case + * because we're not failing the original I/O which succeeded. + */ + + /* Restore what we were doing. */ + P2V(vol, sd->sd_pos, bp->bio_offset, &virtual, ©); + V2P(vol, virtual, &disk, &offset, &start); + + for (copy = 0; copy < N; copy++) { + if ((mask & (1 << copy) ) != 0) + vol->v_subdisks[(disk + copy) % + vol->v_disks_count].sd_recovery--; + } + + if (bp->bio_cmd == BIO_WRITE && bp->bio_error) { + G_RAID_LOGREQ(0, bp, "Remap write failed: " + "failing subdisk."); + g_raid_tr_raid1e_fail_disk(sd->sd_softc, sd, sd->sd_disk); + bp->bio_error = 0; + } + G_RAID_LOGREQ(2, bp, "REMAP done %d.", bp->bio_error); + g_raid_unlock_range(sd->sd_volume, virtual, bp->bio_length); + } + error = bp->bio_error; + g_destroy_bio(bp); + if (pbp->bio_children == pbp->bio_inbed) { + pbp->bio_completed = pbp->bio_length; + g_raid_iodone(pbp, error); + } +} + +static int +g_raid_tr_kerneldump_raid1e(struct g_raid_tr_object *tr, + void *virtual, vm_offset_t physical, off_t boffset, size_t blength) +{ + struct g_raid_volume *vol; + struct g_raid_subdisk *sd; + struct bio_queue_head queue; + char *addr; + off_t offset, start, length, remain; + u_int no, strip_size; + int i, error; + + vol = tr->tro_volume; + addr = virtual; + strip_size = vol->v_strip_size; + V2P(vol, boffset, &no, &offset, &start); + remain = blength; + bioq_init(&queue); + while (remain > 0) { + length = MIN(strip_size - start, remain); + for (i = 0; i < N; i++) { + sd = &vol->v_subdisks[no]; + switch (sd->sd_state) { + case G_RAID_SUBDISK_S_ACTIVE: + case G_RAID_SUBDISK_S_STALE: + case G_RAID_SUBDISK_S_RESYNC: + break; + case G_RAID_SUBDISK_S_REBUILD: + if (offset + start >= sd->sd_rebuild_pos) + goto nextdisk; + break; + default: + goto nextdisk; + } + error = g_raid_subdisk_kerneldump(sd, + addr, 0, offset + start, length); + if (error != 0) + return (error); +nextdisk: + if (++no >= vol->v_disks_count) { + no = 0; + offset += strip_size; + } + } + remain -= length; + addr += length; + start = 0; + } + return (0); +} + +static int +g_raid_tr_locked_raid1e(struct g_raid_tr_object *tr, void *argp) +{ + struct bio *bp; + struct g_raid_subdisk *sd; + + bp = (struct bio *)argp; + sd = (struct g_raid_subdisk *)bp->bio_caller1; + g_raid_subdisk_iostart(sd, bp); + + return (0); +} + +static int +g_raid_tr_idle_raid1e(struct g_raid_tr_object *tr) +{ + struct g_raid_tr_raid1e_object *trs; + struct g_raid_volume *vol; + + vol = tr->tro_volume; + trs = (struct g_raid_tr_raid1e_object *)tr; + trs->trso_fair_io = g_raid1e_rebuild_fair_io; + trs->trso_recover_slabs = g_raid1e_rebuild_cluster_idle; + /* Compensate short rebuild I/Os. */ + if ((vol->v_disks_count % N) != 0 && + vol->v_strip_size < g_raid1e_rebuild_slab) { + trs->trso_recover_slabs *= g_raid1e_rebuild_slab; + trs->trso_recover_slabs /= vol->v_strip_size; + } + if (trs->trso_type == TR_RAID1E_REBUILD) + g_raid_tr_raid1e_rebuild_some(tr); + return (0); +} + +static int +g_raid_tr_free_raid1e(struct g_raid_tr_object *tr) +{ + struct g_raid_tr_raid1e_object *trs; + + trs = (struct g_raid_tr_raid1e_object *)tr; + + if (trs->trso_buffer != NULL) { + free(trs->trso_buffer, M_TR_RAID1E); + trs->trso_buffer = NULL; + } + return (0); +} + +G_RAID_TR_DECLARE(g_raid_tr_raid1e); |
