165 lines
4.2 KiB
C
165 lines
4.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2007 Lukas Ertl
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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 AUTHOR 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 AUTHOR 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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#include <sys/param.h>
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#include <sys/bio.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/systm.h>
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#include <geom/geom.h>
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#include <geom/vinum/geom_vinum_var.h>
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#include <geom/vinum/geom_vinum.h>
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void
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gv_volume_flush(struct gv_volume *v)
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{
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struct gv_softc *sc;
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struct bio *bp;
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KASSERT(v != NULL, ("NULL v"));
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sc = v->vinumconf;
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KASSERT(sc != NULL, ("NULL sc"));
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bp = bioq_takefirst(v->wqueue);
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while (bp != NULL) {
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gv_volume_start(sc, bp);
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bp = bioq_takefirst(v->wqueue);
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}
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}
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void
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gv_volume_start(struct gv_softc *sc, struct bio *bp)
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{
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struct gv_volume *v;
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struct gv_plex *p, *lp;
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int numwrites;
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v = bp->bio_to->private;
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if (v == NULL || v->state != GV_VOL_UP) {
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g_io_deliver(bp, ENXIO);
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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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/*
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* Try to find a good plex where we can send the request to,
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* round-robin-style. The plex either has to be up, or it's a
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* degraded RAID5 plex. Check if we have delayed requests. Put
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* this request on the delayed queue if so. This makes sure that
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* we don't read old values.
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*/
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if (bioq_first(v->wqueue) != NULL) {
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bioq_insert_tail(v->wqueue, bp);
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break;
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}
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lp = v->last_read_plex;
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if (lp == NULL)
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lp = LIST_FIRST(&v->plexes);
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p = LIST_NEXT(lp, in_volume);
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if (p == NULL)
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p = LIST_FIRST(&v->plexes);
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do {
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if (p == NULL) {
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p = lp;
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break;
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}
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if ((p->state > GV_PLEX_DEGRADED) ||
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(p->state >= GV_PLEX_DEGRADED &&
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p->org == GV_PLEX_RAID5))
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break;
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p = LIST_NEXT(p, in_volume);
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if (p == NULL)
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p = LIST_FIRST(&v->plexes);
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} while (p != lp);
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if ((p == NULL) ||
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(p->org == GV_PLEX_RAID5 && p->state < GV_PLEX_DEGRADED) ||
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(p->org != GV_PLEX_RAID5 && p->state <= GV_PLEX_DEGRADED)) {
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g_io_deliver(bp, ENXIO);
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return;
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}
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v->last_read_plex = p;
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/* Hand it down to the plex logic. */
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gv_plex_start(p, bp);
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break;
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case BIO_WRITE:
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case BIO_DELETE:
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/* Delay write-requests if any plex is synchronizing. */
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LIST_FOREACH(p, &v->plexes, in_volume) {
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if (p->flags & GV_PLEX_SYNCING) {
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bioq_insert_tail(v->wqueue, bp);
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return;
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}
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}
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numwrites = 0;
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/* Give the BIO to each plex of this volume. */
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LIST_FOREACH(p, &v->plexes, in_volume) {
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if (p->state < GV_PLEX_DEGRADED)
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continue;
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gv_plex_start(p, bp);
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numwrites++;
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}
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if (numwrites == 0)
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g_io_deliver(bp, ENXIO);
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break;
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}
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}
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void
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gv_bio_done(struct gv_softc *sc, struct bio *bp)
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{
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struct gv_volume *v __diagused;
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struct gv_plex *p;
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struct gv_sd *s;
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s = bp->bio_caller1;
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KASSERT(s != NULL, ("gv_bio_done: NULL s"));
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p = s->plex_sc;
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KASSERT(p != NULL, ("gv_bio_done: NULL p"));
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v = p->vol_sc;
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KASSERT(v != NULL, ("gv_bio_done: NULL v"));
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switch (p->org) {
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case GV_PLEX_CONCAT:
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case GV_PLEX_STRIPED:
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gv_plex_normal_done(p, bp);
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break;
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case GV_PLEX_RAID5:
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gv_plex_raid5_done(p, bp);
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break;
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}
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gv_drive_done(s->drive_sc);
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}
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