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0f0b2fd889
Previously opens succeeded, but actual write operations returned errors. Requested by: peter MFC after: 2 weeks
427 lines
12 KiB
C
427 lines
12 KiB
C
/*-
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* Copyright (c) 2012 Alexander Motin <mav@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/bio.h>
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#include <sys/endian.h>
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#include <sys/kernel.h>
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#include <sys/kobj.h>
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#include <sys/limits.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <geom/geom.h>
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#include "geom/raid/g_raid.h"
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#include "g_raid_tr_if.h"
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static MALLOC_DEFINE(M_TR_RAID5, "tr_raid5_data", "GEOM_RAID RAID5 data");
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#define TR_RAID5_NONE 0
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#define TR_RAID5_REBUILD 1
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#define TR_RAID5_RESYNC 2
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#define TR_RAID5_F_DOING_SOME 0x1
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#define TR_RAID5_F_LOCKED 0x2
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#define TR_RAID5_F_ABORT 0x4
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struct g_raid_tr_raid5_object {
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struct g_raid_tr_object trso_base;
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int trso_starting;
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int trso_stopping;
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int trso_type;
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int trso_recover_slabs; /* slabs before rest */
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int trso_fair_io;
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int trso_meta_update;
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int trso_flags;
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struct g_raid_subdisk *trso_failed_sd; /* like per volume */
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void *trso_buffer; /* Buffer space */
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struct bio trso_bio;
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};
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static g_raid_tr_taste_t g_raid_tr_taste_raid5;
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static g_raid_tr_event_t g_raid_tr_event_raid5;
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static g_raid_tr_start_t g_raid_tr_start_raid5;
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static g_raid_tr_stop_t g_raid_tr_stop_raid5;
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static g_raid_tr_iostart_t g_raid_tr_iostart_raid5;
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static g_raid_tr_iodone_t g_raid_tr_iodone_raid5;
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static g_raid_tr_kerneldump_t g_raid_tr_kerneldump_raid5;
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static g_raid_tr_locked_t g_raid_tr_locked_raid5;
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static g_raid_tr_free_t g_raid_tr_free_raid5;
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static kobj_method_t g_raid_tr_raid5_methods[] = {
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KOBJMETHOD(g_raid_tr_taste, g_raid_tr_taste_raid5),
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KOBJMETHOD(g_raid_tr_event, g_raid_tr_event_raid5),
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KOBJMETHOD(g_raid_tr_start, g_raid_tr_start_raid5),
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KOBJMETHOD(g_raid_tr_stop, g_raid_tr_stop_raid5),
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KOBJMETHOD(g_raid_tr_iostart, g_raid_tr_iostart_raid5),
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KOBJMETHOD(g_raid_tr_iodone, g_raid_tr_iodone_raid5),
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KOBJMETHOD(g_raid_tr_kerneldump, g_raid_tr_kerneldump_raid5),
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KOBJMETHOD(g_raid_tr_locked, g_raid_tr_locked_raid5),
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KOBJMETHOD(g_raid_tr_free, g_raid_tr_free_raid5),
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{ 0, 0 }
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};
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static struct g_raid_tr_class g_raid_tr_raid5_class = {
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"RAID5",
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g_raid_tr_raid5_methods,
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sizeof(struct g_raid_tr_raid5_object),
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.trc_enable = 1,
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.trc_priority = 100
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};
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static int
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g_raid_tr_taste_raid5(struct g_raid_tr_object *tr, struct g_raid_volume *vol)
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{
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struct g_raid_tr_raid5_object *trs;
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u_int qual;
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trs = (struct g_raid_tr_raid5_object *)tr;
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qual = tr->tro_volume->v_raid_level_qualifier;
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if (tr->tro_volume->v_raid_level == G_RAID_VOLUME_RL_RAID4 &&
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(qual == G_RAID_VOLUME_RLQ_R4P0 ||
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qual == G_RAID_VOLUME_RLQ_R4PN)) {
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/* RAID4 */
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} else if ((tr->tro_volume->v_raid_level == G_RAID_VOLUME_RL_RAID5 ||
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tr->tro_volume->v_raid_level == G_RAID_VOLUME_RL_RAID5E ||
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tr->tro_volume->v_raid_level == G_RAID_VOLUME_RL_RAID5EE ||
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tr->tro_volume->v_raid_level == G_RAID_VOLUME_RL_RAID5R ||
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tr->tro_volume->v_raid_level == G_RAID_VOLUME_RL_RAID6 ||
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tr->tro_volume->v_raid_level == G_RAID_VOLUME_RL_RAIDMDF) &&
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(qual == G_RAID_VOLUME_RLQ_R5RA ||
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qual == G_RAID_VOLUME_RLQ_R5RS ||
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qual == G_RAID_VOLUME_RLQ_R5LA ||
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qual == G_RAID_VOLUME_RLQ_R5LS)) {
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/* RAID5/5E/5EE/5R/6/MDF */
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} else
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return (G_RAID_TR_TASTE_FAIL);
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trs->trso_starting = 1;
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return (G_RAID_TR_TASTE_SUCCEED);
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}
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static int
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g_raid_tr_update_state_raid5(struct g_raid_volume *vol,
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struct g_raid_subdisk *sd)
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{
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struct g_raid_tr_raid5_object *trs;
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struct g_raid_softc *sc;
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u_int s;
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int na, ns, nu;
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sc = vol->v_softc;
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trs = (struct g_raid_tr_raid5_object *)vol->v_tr;
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if (trs->trso_stopping &&
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(trs->trso_flags & TR_RAID5_F_DOING_SOME) == 0)
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s = G_RAID_VOLUME_S_STOPPED;
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else if (trs->trso_starting)
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s = G_RAID_VOLUME_S_STARTING;
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else {
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na = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_ACTIVE);
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ns = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_STALE) +
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g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_RESYNC);
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nu = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_UNINITIALIZED);
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if (na == vol->v_disks_count)
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s = G_RAID_VOLUME_S_OPTIMAL;
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else if (na + ns == vol->v_disks_count ||
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na + ns + nu == vol->v_disks_count /* XXX: Temporary. */)
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s = G_RAID_VOLUME_S_SUBOPTIMAL;
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else if (na == vol->v_disks_count - 1 ||
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na + ns + nu == vol->v_disks_count)
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s = G_RAID_VOLUME_S_DEGRADED;
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else
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s = G_RAID_VOLUME_S_BROKEN;
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}
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if (s != vol->v_state) {
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g_raid_event_send(vol, G_RAID_VOLUME_S_ALIVE(s) ?
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G_RAID_VOLUME_E_UP : G_RAID_VOLUME_E_DOWN,
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G_RAID_EVENT_VOLUME);
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g_raid_change_volume_state(vol, s);
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if (!trs->trso_starting && !trs->trso_stopping)
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g_raid_write_metadata(sc, vol, NULL, NULL);
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}
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return (0);
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}
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static int
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g_raid_tr_event_raid5(struct g_raid_tr_object *tr,
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struct g_raid_subdisk *sd, u_int event)
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{
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g_raid_tr_update_state_raid5(tr->tro_volume, sd);
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return (0);
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}
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static int
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g_raid_tr_start_raid5(struct g_raid_tr_object *tr)
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{
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struct g_raid_tr_raid5_object *trs;
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struct g_raid_volume *vol;
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trs = (struct g_raid_tr_raid5_object *)tr;
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trs->trso_starting = 0;
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vol = tr->tro_volume;
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vol->v_read_only = 1;
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g_raid_tr_update_state_raid5(vol, NULL);
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return (0);
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}
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static int
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g_raid_tr_stop_raid5(struct g_raid_tr_object *tr)
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{
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struct g_raid_tr_raid5_object *trs;
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struct g_raid_volume *vol;
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trs = (struct g_raid_tr_raid5_object *)tr;
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vol = tr->tro_volume;
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trs->trso_starting = 0;
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trs->trso_stopping = 1;
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g_raid_tr_update_state_raid5(vol, NULL);
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return (0);
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}
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static void
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g_raid_tr_iostart_raid5_read(struct g_raid_tr_object *tr, struct bio *bp)
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{
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struct g_raid_volume *vol;
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struct g_raid_subdisk *sd;
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struct bio_queue_head queue;
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struct bio *cbp;
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char *addr;
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off_t offset, start, length, nstripe, remain;
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int no, pno, ddisks, pdisks, protate, pleft;
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u_int strip_size, lvl, qual;
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vol = tr->tro_volume;
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addr = bp->bio_data;
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strip_size = vol->v_strip_size;
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lvl = tr->tro_volume->v_raid_level;
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qual = tr->tro_volume->v_raid_level_qualifier;
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protate = tr->tro_volume->v_rotate_parity;
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/* Stripe number. */
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nstripe = bp->bio_offset / strip_size;
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/* Start position in stripe. */
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start = bp->bio_offset % strip_size;
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/* Number of data and parity disks. */
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if (lvl == G_RAID_VOLUME_RL_RAIDMDF)
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pdisks = tr->tro_volume->v_mdf_pdisks;
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else if (lvl == G_RAID_VOLUME_RL_RAID5EE ||
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lvl == G_RAID_VOLUME_RL_RAID6)
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pdisks = 2;
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else
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pdisks = 1;
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ddisks = vol->v_disks_count - pdisks;
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/* Parity disk number. */
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if (lvl == G_RAID_VOLUME_RL_RAID4) {
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if (qual == 0) /* P0 */
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pno = 0;
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else /* PN */
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pno = ddisks;
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pleft = -1;
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} else {
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pno = (nstripe / (ddisks * protate)) % vol->v_disks_count;
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pleft = protate - (nstripe / ddisks) % protate;
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if (qual >= 2) { /* PN/Left */
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pno = ddisks - pno;
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if (pno < 0)
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pno += vol->v_disks_count;
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}
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}
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/* Data disk number. */
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no = nstripe % ddisks;
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if (lvl == G_RAID_VOLUME_RL_RAID4) {
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if (qual == 0)
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no += pdisks;
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} else if (qual & 1) { /* Continuation/Symmetric */
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no = (pno + pdisks + no) % vol->v_disks_count;
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} else if (no >= pno) /* Restart/Asymmetric */
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no += pdisks;
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else
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no += imax(0, pno + pdisks - vol->v_disks_count);
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/* Stripe start position in disk. */
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offset = (nstripe / ddisks) * strip_size;
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/* Length of data to operate. */
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remain = bp->bio_length;
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bioq_init(&queue);
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do {
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length = MIN(strip_size - start, remain);
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cbp = g_clone_bio(bp);
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if (cbp == NULL)
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goto failure;
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cbp->bio_offset = offset + start;
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cbp->bio_data = addr;
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cbp->bio_length = length;
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cbp->bio_caller1 = &vol->v_subdisks[no];
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bioq_insert_tail(&queue, cbp);
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no++;
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if (lvl == G_RAID_VOLUME_RL_RAID4) {
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no %= vol->v_disks_count;
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if (no == pno)
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no = (no + pdisks) % vol->v_disks_count;
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} else if (qual & 1) { /* Continuation/Symmetric */
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no %= vol->v_disks_count;
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if (no == pno) {
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if ((--pleft) <= 0) {
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pleft += protate;
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if (qual < 2) /* P0/Right */
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pno++;
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else /* PN/Left */
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pno += vol->v_disks_count - 1;
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pno %= vol->v_disks_count;
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}
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no = (pno + pdisks) % vol->v_disks_count;
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offset += strip_size;
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}
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} else { /* Restart/Asymmetric */
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if (no == pno)
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no += pdisks;
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if (no >= vol->v_disks_count) {
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no -= vol->v_disks_count;
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if ((--pleft) <= 0) {
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pleft += protate;
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if (qual < 2) /* P0/Right */
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pno++;
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else /* PN/Left */
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pno += vol->v_disks_count - 1;
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pno %= vol->v_disks_count;
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}
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if (no == pno)
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no += pdisks;
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else
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no += imax(0, pno + pdisks - vol->v_disks_count);
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offset += strip_size;
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}
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}
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remain -= length;
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addr += length;
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start = 0;
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} while (remain > 0);
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for (cbp = bioq_first(&queue); cbp != NULL;
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cbp = bioq_first(&queue)) {
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bioq_remove(&queue, cbp);
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sd = cbp->bio_caller1;
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cbp->bio_caller1 = NULL;
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g_raid_subdisk_iostart(sd, cbp);
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}
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return;
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failure:
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for (cbp = bioq_first(&queue); cbp != NULL;
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cbp = bioq_first(&queue)) {
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bioq_remove(&queue, cbp);
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g_destroy_bio(cbp);
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}
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if (bp->bio_error == 0)
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bp->bio_error = ENOMEM;
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g_raid_iodone(bp, bp->bio_error);
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}
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static void
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g_raid_tr_iostart_raid5(struct g_raid_tr_object *tr, struct bio *bp)
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{
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struct g_raid_volume *vol;
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struct g_raid_tr_raid5_object *trs;
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vol = tr->tro_volume;
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trs = (struct g_raid_tr_raid5_object *)tr;
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if (vol->v_state < G_RAID_VOLUME_S_SUBOPTIMAL) {
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g_raid_iodone(bp, EIO);
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return;
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}
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switch (bp->bio_cmd) {
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case BIO_READ:
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g_raid_tr_iostart_raid5_read(tr, bp);
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break;
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case BIO_WRITE:
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case BIO_DELETE:
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case BIO_FLUSH:
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g_raid_iodone(bp, ENODEV);
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break;
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default:
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KASSERT(1 == 0, ("Invalid command here: %u (volume=%s)",
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bp->bio_cmd, vol->v_name));
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break;
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}
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}
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static void
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g_raid_tr_iodone_raid5(struct g_raid_tr_object *tr,
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struct g_raid_subdisk *sd, struct bio *bp)
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{
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struct bio *pbp;
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int error;
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pbp = bp->bio_parent;
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pbp->bio_inbed++;
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error = bp->bio_error;
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g_destroy_bio(bp);
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if (pbp->bio_children == pbp->bio_inbed) {
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pbp->bio_completed = pbp->bio_length;
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g_raid_iodone(pbp, error);
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}
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}
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static int
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g_raid_tr_kerneldump_raid5(struct g_raid_tr_object *tr,
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void *virtual, vm_offset_t physical, off_t offset, size_t length)
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{
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return (ENODEV);
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}
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static int
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g_raid_tr_locked_raid5(struct g_raid_tr_object *tr, void *argp)
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{
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struct bio *bp;
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struct g_raid_subdisk *sd;
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bp = (struct bio *)argp;
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sd = (struct g_raid_subdisk *)bp->bio_caller1;
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g_raid_subdisk_iostart(sd, bp);
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return (0);
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}
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static int
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g_raid_tr_free_raid5(struct g_raid_tr_object *tr)
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{
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struct g_raid_tr_raid5_object *trs;
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trs = (struct g_raid_tr_raid5_object *)tr;
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if (trs->trso_buffer != NULL) {
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free(trs->trso_buffer, M_TR_RAID5);
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trs->trso_buffer = NULL;
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}
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return (0);
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}
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G_RAID_TR_DECLARE(raid5, "RAID5");
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