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/*-
* 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: release/9.1.0/sys/geom/raid/tr_raid1e.c 240558 2012-09-16 11:02:22Z mav $");
#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_raid1e);
#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_enable = 1,
.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_R1EA)
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_softc *sc;
struct g_raid_subdisk *sd, *bestsd, *worstsd;
int i, j, state, sstate;
sc = vol->v_softc;
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_softc *sc;
struct g_raid_subdisk *sd, *bestsd, *worstsd;
int i, j, state, sstate;
sc = vol->v_softc;
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)
{
struct g_raid_volume *vol;
vol = sd->sd_volume;
/*
* 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(vol, G_RAID_SUBDISK_S_ACTIVE) +
g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_RESYNC) +
g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_STALE) +
g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_UNINITIALIZED) <
vol->v_disks_count) &&
(sd->sd_state >= G_RAID_SUBDISK_S_UNINITIALIZED))
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);
}
if (pbp->bio_cmd != BIO_READ) {
if (pbp->bio_inbed == 1 || pbp->bio_error != 0)
pbp->bio_error = bp->bio_error;
if (bp->bio_error != 0) {
G_RAID_LOGREQ(0, bp, "Write failed: failing subdisk.");
g_raid_tr_raid1e_fail_disk(sd->sd_softc, sd, sd->sd_disk);
}
error = pbp->bio_error;
} else
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(raid1e, "RAID1E");