Current Path : /sys/geom/raid/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
Current File : //sys/geom/raid/tr_raid1e.c |
/*- * 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");