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4328802ce9
volume already has a plex attached and adjust the access counts of the new consumer accordingly.
281 lines
6.6 KiB
C
281 lines
6.6 KiB
C
/*-
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* Copyright (c) 2004 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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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/bio.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/libkern.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/mutex.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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static void
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gv_volume_orphan(struct g_consumer *cp)
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{
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struct g_geom *gp;
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struct gv_volume *v;
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int error;
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g_topology_assert();
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gp = cp->geom;
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g_trace(G_T_TOPOLOGY, "gv_volume_orphan(%s)", gp->name);
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if (cp->acr != 0 || cp->acw != 0 || cp->ace != 0)
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g_access(cp, -cp->acr, -cp->acw, -cp->ace);
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error = cp->provider->error;
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if (error == 0)
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error = ENXIO;
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g_detach(cp);
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g_destroy_consumer(cp);
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if (!LIST_EMPTY(&gp->consumer))
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return;
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v = gp->softc;
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if (v != NULL)
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v->geom = NULL;
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gp->softc = NULL;
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g_wither_geom(gp, error);
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}
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/* We end up here after the requests to our plexes are done. */
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static void
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gv_volume_done(struct bio *bp)
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{
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struct g_consumer *cp;
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/* The next plex in this volume. */
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cp = LIST_NEXT(bp->bio_from, consumer);
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switch (bp->bio_cmd) {
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case BIO_READ:
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/*
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* If no error occured on this request, or if we have no plex
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* left, finish here...
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*/
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if ((bp->bio_error == 0) || (cp == NULL)) {
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g_std_done(bp);
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return;
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}
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/* ... or try to read from the next plex. */
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g_io_request(bp, cp);
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return;
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case BIO_WRITE:
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case BIO_DELETE:
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/* No more plexes left. */
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if (cp == NULL) {
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/*
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* Clear any errors if one of the previous writes
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* succeeded.
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*/
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if (bp->bio_caller1 == (int *)1)
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bp->bio_error = 0;
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g_std_done(bp);
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return;
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}
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/* If this write request had no errors, remember that fact... */
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if (bp->bio_error == 0)
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bp->bio_caller1 = (int *)1;
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/* ... and write to the next plex. */
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g_io_request(bp, cp);
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return;
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}
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}
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static void
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gv_volume_start(struct bio *bp)
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{
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struct g_geom *gp;
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struct bio *bp2;
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struct gv_volume *v;
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gp = bp->bio_to->geom;
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v = gp->softc;
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if (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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case BIO_WRITE:
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case BIO_DELETE:
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bp2 = g_clone_bio(bp);
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if (bp2 == NULL) {
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g_io_deliver(bp, ENOMEM);
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return;
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}
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bp2->bio_done = gv_volume_done;
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g_io_request(bp2, LIST_FIRST(&gp->consumer));
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return;
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default:
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g_io_deliver(bp, EOPNOTSUPP);
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return;
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}
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}
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static int
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gv_volume_access(struct g_provider *pp, int dr, int dw, int de)
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{
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struct g_geom *gp;
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struct g_consumer *cp, *cp2;
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int error;
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gp = pp->geom;
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error = ENXIO;
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LIST_FOREACH(cp, &gp->consumer, consumer) {
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error = g_access(cp, dr, dw, de);
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if (error) {
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LIST_FOREACH(cp2, &gp->consumer, consumer) {
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if (cp == cp2)
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break;
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g_access(cp2, -dr, -dw, -de);
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}
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return (error);
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}
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}
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return (error);
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}
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static struct g_geom *
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gv_volume_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
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{
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struct g_geom *gp;
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struct g_provider *pp2;
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struct g_consumer *cp, *ocp;
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struct gv_softc *sc;
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struct gv_volume *v;
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struct gv_plex *p;
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int error, first;
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g_trace(G_T_TOPOLOGY, "gv_volume_taste(%s, %s)", mp->name, pp->name);
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g_topology_assert();
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/* First, find the VINUM class and its associated geom. */
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gp = find_vinum_geom();
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if (gp == NULL)
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return (NULL);
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sc = gp->softc;
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KASSERT(sc != NULL, ("gv_volume_taste: NULL sc"));
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gp = pp->geom;
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/* We only want to attach to plexes. */
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if (strcmp(gp->class->name, "VINUMPLEX"))
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return (NULL);
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first = 0;
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p = gp->softc;
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v = gv_find_vol(sc, p->volume);
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if (v == NULL)
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return (NULL);
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if (v->geom == NULL) {
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gp = g_new_geomf(mp, "%s", p->volume);
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gp->start = gv_volume_start;
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gp->orphan = gv_volume_orphan;
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gp->access = gv_volume_access;
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gp->softc = v;
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first++;
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} else
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gp = v->geom;
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/*
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* Create a new consumer and attach it to the plex geom. Since this
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* volume might already have a plex attached, we need to adjust the
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* access counts of the new consumer.
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*/
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ocp = LIST_FIRST(&gp->consumer);
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cp = g_new_consumer(gp);
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g_attach(cp, pp);
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if ((ocp != NULL) && (ocp->acr > 0 || ocp->acw > 0 || ocp->ace > 0)) {
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error = g_access(cp, ocp->acr, ocp->acw, ocp->ace);
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if (error) {
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printf("GEOM_VINUM: failed g_access %s -> %s; "
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"errno %d\n", v->name, p->name, error);
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g_detach(cp);
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g_destroy_consumer(cp);
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if (first)
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g_destroy_geom(gp);
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return (NULL);
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}
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}
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p->consumer = cp;
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if (p->vol_sc != v) {
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p->vol_sc = v;
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v->plexcount++;
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LIST_INSERT_HEAD(&v->plexes, p, in_volume);
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}
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/* We need to setup a new VINUMVOLUME geom. */
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if (first) {
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pp2 = g_new_providerf(gp, "gvinum/%s", v->name);
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pp2->mediasize = pp->mediasize;
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pp2->sectorsize = pp->sectorsize;
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g_error_provider(pp2, 0);
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v->size = pp2->mediasize;
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v->geom = gp;
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return (gp);
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}
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return (NULL);
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}
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static int
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gv_volume_destroy_geom(struct gctl_req *req, struct g_class *mp,
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struct g_geom *gp)
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{
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g_trace(G_T_TOPOLOGY, "gv_volume_destroy_geom: %s", gp->name);
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g_topology_assert();
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g_wither_geom(gp, ENXIO);
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return (0);
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}
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#define VINUMVOLUME_CLASS_NAME "VINUMVOLUME"
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static struct g_class g_vinum_volume_class = {
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.name = VINUMVOLUME_CLASS_NAME,
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.version = G_VERSION,
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.taste = gv_volume_taste,
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.destroy_geom = gv_volume_destroy_geom,
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};
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DECLARE_GEOM_CLASS(g_vinum_volume_class, g_vinum_volume);
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