2007-04-06 01:09:06 +00:00
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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* All rights reserved.
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*/
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#include <sys/zfs_context.h>
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/bio.h>
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2007-05-06 01:39:39 +00:00
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#include <sys/disk.h>
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2007-04-06 01:09:06 +00:00
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#include <sys/spa.h>
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#include <sys/vdev_impl.h>
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#include <sys/fs/zfs.h>
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#include <sys/zio.h>
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#include <geom/geom.h>
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2007-05-06 01:39:39 +00:00
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#include <geom/geom_int.h>
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2007-04-06 01:09:06 +00:00
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/*
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* Virtual device vector for GEOM.
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*/
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struct g_class zfs_vdev_class = {
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.name = "ZFS::VDEV",
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.version = G_VERSION,
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};
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DECLARE_GEOM_CLASS(zfs_vdev_class, zfs_vdev);
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typedef struct vdev_geom_ctx {
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struct g_consumer *gc_consumer;
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int gc_state;
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struct bio_queue_head gc_queue;
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struct mtx gc_queue_mtx;
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} vdev_geom_ctx_t;
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static void
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vdev_geom_release(vdev_t *vd)
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{
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vdev_geom_ctx_t *ctx;
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ctx = vd->vdev_tsd;
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vd->vdev_tsd = NULL;
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mtx_lock(&ctx->gc_queue_mtx);
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ctx->gc_state = 1;
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wakeup_one(&ctx->gc_queue);
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while (ctx->gc_state != 2)
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msleep(&ctx->gc_state, &ctx->gc_queue_mtx, 0, "vgeom:w", 0);
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mtx_unlock(&ctx->gc_queue_mtx);
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mtx_destroy(&ctx->gc_queue_mtx);
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kmem_free(ctx, sizeof(*ctx));
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}
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static void
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vdev_geom_orphan(struct g_consumer *cp)
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{
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struct g_geom *gp;
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vdev_t *vd;
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int error;
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g_topology_assert();
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vd = cp->private;
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gp = cp->geom;
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error = cp->provider->error;
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ZFS_LOG(1, "Closing access to %s.", cp->provider->name);
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2007-05-06 01:39:39 +00:00
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if (cp->acr + cp->acw + cp->ace > 0)
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g_access(cp, -cp->acr, -cp->acw, -cp->ace);
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2007-04-06 01:09:06 +00:00
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ZFS_LOG(1, "Destroyed consumer to %s.", cp->provider->name);
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2007-04-29 00:41:29 +00:00
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g_detach(cp);
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2007-04-06 01:09:06 +00:00
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g_destroy_consumer(cp);
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/* Destroy geom if there are no consumers left. */
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if (LIST_EMPTY(&gp->consumer)) {
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ZFS_LOG(1, "Destroyed geom %s.", gp->name);
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2007-04-29 00:41:29 +00:00
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g_wither_geom(gp, error);
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2007-04-06 01:09:06 +00:00
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}
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vdev_geom_release(vd);
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/* Both methods below work, but in a bit different way. */
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#if 0
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vd->vdev_reopen_wanted = 1;
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#else
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vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
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vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, vd->vdev_stat.vs_aux);
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#endif
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}
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static struct g_consumer *
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vdev_geom_attach(struct g_provider *pp, int write)
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{
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struct g_geom *gp;
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struct g_consumer *cp;
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g_topology_assert();
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ZFS_LOG(1, "Attaching to %s.", pp->name);
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/* Do we have geom already? No? Create one. */
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LIST_FOREACH(gp, &zfs_vdev_class.geom, geom) {
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2007-05-06 01:39:39 +00:00
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if (gp->flags & G_GEOM_WITHER)
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continue;
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if (strcmp(gp->name, "zfs::vdev") != 0)
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continue;
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break;
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2007-04-06 01:09:06 +00:00
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}
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if (gp == NULL) {
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gp = g_new_geomf(&zfs_vdev_class, "zfs::vdev");
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gp->orphan = vdev_geom_orphan;
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cp = g_new_consumer(gp);
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if (g_attach(cp, pp) != 0) {
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g_wither_geom(gp, ENXIO);
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return (NULL);
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}
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if (g_access(cp, 1, write, 1) != 0) {
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g_wither_geom(gp, ENXIO);
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return (NULL);
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}
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ZFS_LOG(1, "Created geom and consumer for %s.", pp->name);
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} else {
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/* Check if we are already connected to this provider. */
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LIST_FOREACH(cp, &gp->consumer, consumer) {
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if (cp->provider == pp) {
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ZFS_LOG(1, "Found consumer for %s.", pp->name);
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break;
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}
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}
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if (cp == NULL) {
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cp = g_new_consumer(gp);
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if (g_attach(cp, pp) != 0) {
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g_destroy_consumer(cp);
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return (NULL);
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}
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if (g_access(cp, 1, write, 1) != 0) {
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g_detach(cp);
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g_destroy_consumer(cp);
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return (NULL);
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}
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ZFS_LOG(1, "Created consumer for %s.", pp->name);
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} else {
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if (g_access(cp, 1, cp->acw > 0 ? 0 : write, 1) != 0)
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return (NULL);
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ZFS_LOG(1, "Used existing consumer for %s.", pp->name);
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}
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}
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return (cp);
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}
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static void
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vdev_geom_detach(void *arg, int flag __unused)
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{
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struct g_geom *gp;
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struct g_consumer *cp;
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g_topology_assert();
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cp = arg;
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gp = cp->geom;
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ZFS_LOG(1, "Closing access to %s.", cp->provider->name);
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g_access(cp, -1, 0, -1);
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/* Destroy consumer on last close. */
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if (cp->acr == 0 && cp->ace == 0) {
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ZFS_LOG(1, "Destroyed consumer to %s.", cp->provider->name);
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if (cp->acw > 0)
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g_access(cp, 0, -cp->acw, 0);
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g_detach(cp);
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g_destroy_consumer(cp);
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}
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/* Destroy geom if there are no consumers left. */
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if (LIST_EMPTY(&gp->consumer)) {
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ZFS_LOG(1, "Destroyed geom %s.", gp->name);
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g_wither_geom(gp, ENXIO);
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}
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}
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static void
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vdev_geom_worker(void *arg)
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{
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vdev_geom_ctx_t *ctx;
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zio_t *zio;
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struct bio *bp;
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ctx = arg;
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for (;;) {
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mtx_lock(&ctx->gc_queue_mtx);
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bp = bioq_takefirst(&ctx->gc_queue);
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if (bp == NULL) {
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if (ctx->gc_state == 1) {
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ctx->gc_state = 2;
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wakeup_one(&ctx->gc_state);
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mtx_unlock(&ctx->gc_queue_mtx);
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kthread_exit(0);
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}
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msleep(&ctx->gc_queue, &ctx->gc_queue_mtx,
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PRIBIO | PDROP, "vgeom:io", 0);
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continue;
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}
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mtx_unlock(&ctx->gc_queue_mtx);
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zio = bp->bio_caller1;
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zio->io_error = bp->bio_error;
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if (bp->bio_cmd == BIO_FLUSH && bp->bio_error == ENOTSUP) {
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vdev_t *vd;
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/*
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* If we get ENOTSUP, we know that no future
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* attempts will ever succeed. In this case we
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* set a persistent bit so that we don't bother
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* with the ioctl in the future.
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*/
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vd = zio->io_vd;
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vd->vdev_nowritecache = B_TRUE;
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}
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g_destroy_bio(bp);
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zio_next_stage_async(zio);
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}
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}
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2007-05-06 01:39:39 +00:00
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static char *
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vdev_geom_get_id(struct g_consumer *cp)
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{
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char *id;
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int len;
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g_topology_assert_not();
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len = DISK_IDENT_SIZE;
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id = kmem_zalloc(len, KM_SLEEP);
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if (g_io_getattr("GEOM::ident", cp, &len, id) != 0) {
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kmem_free(id, DISK_IDENT_SIZE);
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return (NULL);
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}
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return (id);
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}
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static void
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vdev_geom_free_id(char *id)
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{
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if (id != NULL)
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kmem_free(id, DISK_IDENT_SIZE);
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}
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struct vdev_geom_find {
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const char *id;
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int write;
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struct g_consumer *cp;
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};
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static void
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vdev_geom_taste_orphan(struct g_consumer *cp)
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{
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KASSERT(1 == 0, ("%s called while tasting %s.", __func__,
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cp->provider->name));
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}
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static void
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vdev_geom_attach_by_id_event(void *arg, int flags __unused)
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{
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struct vdev_geom_find *ap;
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struct g_class *mp;
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struct g_geom *gp, *zgp;
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struct g_provider *pp;
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struct g_consumer *zcp;
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char *id;
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g_topology_assert();
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ap = arg;
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zgp = g_new_geomf(&zfs_vdev_class, "zfs::vdev::taste");
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/* This orphan function should be never called. */
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zgp->orphan = vdev_geom_taste_orphan;
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zcp = g_new_consumer(zgp);
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LIST_FOREACH(mp, &g_classes, class) {
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if (mp == &zfs_vdev_class)
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continue;
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LIST_FOREACH(gp, &mp->geom, geom) {
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if (gp->flags & G_GEOM_WITHER)
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continue;
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LIST_FOREACH(pp, &gp->provider, provider) {
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if (pp->flags & G_PF_WITHER)
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continue;
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g_attach(zcp, pp);
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if (g_access(zcp, 1, 0, 0) != 0) {
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g_detach(zcp);
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continue;
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}
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g_topology_unlock();
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id = vdev_geom_get_id(zcp);
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g_topology_lock();
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g_access(zcp, -1, 0, 0);
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g_detach(zcp);
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if (id == NULL || strcmp(id, ap->id) != 0) {
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vdev_geom_free_id(id);
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continue;
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}
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vdev_geom_free_id(id);
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ap->cp = vdev_geom_attach(pp, ap->write);
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if (ap->cp == NULL) {
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printf("ZFS WARNING: Cannot open %s "
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"for writting.\n", pp->name);
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continue;
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}
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goto end;
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}
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}
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}
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ap->cp = NULL;
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end:
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g_destroy_consumer(zcp);
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g_destroy_geom(zgp);
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}
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static struct g_consumer *
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vdev_geom_attach_by_id(const char *id, int write)
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{
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struct vdev_geom_find *ap;
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struct g_consumer *cp;
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ap = kmem_zalloc(sizeof(*ap), KM_SLEEP);
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ap->id = id;
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ap->write = write;
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g_waitfor_event(vdev_geom_attach_by_id_event, ap, M_WAITOK, NULL);
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cp = ap->cp;
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kmem_free(ap, sizeof(*ap));
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return (cp);
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}
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|
2007-04-06 01:09:06 +00:00
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static int
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vdev_geom_open(vdev_t *vd, uint64_t *psize, uint64_t *ashift)
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{
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vdev_geom_ctx_t *ctx;
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struct g_provider *pp;
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struct g_consumer *cp;
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2007-05-06 01:39:39 +00:00
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char *id = NULL;
|
2007-04-06 01:09:06 +00:00
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|
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int owned;
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/*
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* We must have a pathname, and it must be absolute.
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*/
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if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') {
|
|
|
|
vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
|
|
|
|
return (EINVAL);
|
|
|
|
}
|
|
|
|
|
|
|
|
if ((owned = mtx_owned(&Giant)))
|
|
|
|
mtx_unlock(&Giant);
|
2007-05-06 01:39:39 +00:00
|
|
|
cp = NULL;
|
2007-04-06 01:09:06 +00:00
|
|
|
g_topology_lock();
|
|
|
|
pp = g_provider_by_name(vd->vdev_path + sizeof("/dev/") - 1);
|
2007-05-06 01:39:39 +00:00
|
|
|
if (pp != NULL) {
|
|
|
|
ZFS_LOG(1, "Found provider by name %s.", vd->vdev_path);
|
|
|
|
cp = vdev_geom_attach(pp, !!(spa_mode & FWRITE));
|
|
|
|
if (cp != NULL && vd->vdev_devid != NULL) {
|
|
|
|
g_topology_unlock();
|
|
|
|
id = vdev_geom_get_id(cp);
|
|
|
|
g_topology_lock();
|
|
|
|
if (id == NULL || strcmp(id, vd->vdev_devid) != 0) {
|
|
|
|
vdev_geom_detach(cp, 0);
|
|
|
|
cp = NULL;
|
|
|
|
ZFS_LOG(1, "ID mismatch for provider %s: "
|
|
|
|
"[%s]!=[%s].", vd->vdev_path,
|
|
|
|
vd->vdev_devid, id);
|
|
|
|
goto next;
|
|
|
|
}
|
|
|
|
ZFS_LOG(1, "ID match for provider %s.", vd->vdev_path);
|
|
|
|
}
|
2007-04-06 01:09:06 +00:00
|
|
|
}
|
2007-05-06 01:39:39 +00:00
|
|
|
next:
|
2007-04-06 01:09:06 +00:00
|
|
|
g_topology_unlock();
|
2007-05-06 01:39:39 +00:00
|
|
|
vdev_geom_free_id(id);
|
|
|
|
if (cp == NULL && vd->vdev_devid != NULL) {
|
2007-05-09 22:32:49 +00:00
|
|
|
ZFS_LOG(1, "Searching by ID [%s].", vd->vdev_devid);
|
2007-05-06 01:39:39 +00:00
|
|
|
cp = vdev_geom_attach_by_id(vd->vdev_devid,
|
|
|
|
!!(spa_mode & FWRITE));
|
|
|
|
if (cp != NULL) {
|
|
|
|
size_t len = strlen(cp->provider->name) + 6; /* 6 == strlen("/dev/") + 1 */
|
|
|
|
char *buf = kmem_alloc(len, KM_SLEEP);
|
|
|
|
|
|
|
|
snprintf(buf, len, "/dev/%s", cp->provider->name);
|
|
|
|
spa_strfree(vd->vdev_path);
|
|
|
|
vd->vdev_path = buf;
|
|
|
|
|
|
|
|
ZFS_LOG(1, "Attach by ID [%s] succeeded, provider %s.",
|
|
|
|
vd->vdev_devid, vd->vdev_path);
|
|
|
|
}
|
|
|
|
}
|
2007-04-06 01:09:06 +00:00
|
|
|
if (owned)
|
|
|
|
mtx_lock(&Giant);
|
|
|
|
if (cp == NULL) {
|
2007-05-06 01:39:39 +00:00
|
|
|
ZFS_LOG(1, "Provider %s (id=[%s]) not found.", vd->vdev_path,
|
|
|
|
vd->vdev_devid);
|
2007-04-06 01:09:06 +00:00
|
|
|
vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
|
|
|
|
return (EACCES);
|
|
|
|
}
|
2007-05-06 01:39:39 +00:00
|
|
|
pp = cp->provider;
|
2007-04-06 01:09:06 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Determine the actual size of the device.
|
|
|
|
*/
|
|
|
|
*psize = pp->mediasize;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Determine the device's minimum transfer size.
|
|
|
|
*/
|
|
|
|
*ashift = highbit(MAX(pp->sectorsize, SPA_MINBLOCKSIZE)) - 1;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Clear the nowritecache bit, so that on a vdev_reopen() we will
|
|
|
|
* try again.
|
|
|
|
*/
|
|
|
|
vd->vdev_nowritecache = B_FALSE;
|
|
|
|
|
|
|
|
cp->private = vd;
|
|
|
|
|
|
|
|
ctx = kmem_zalloc(sizeof(*ctx), KM_SLEEP);
|
|
|
|
bioq_init(&ctx->gc_queue);
|
|
|
|
mtx_init(&ctx->gc_queue_mtx, "zfs:vdev:geom:queue", NULL, MTX_DEF);
|
|
|
|
ctx->gc_consumer = cp;
|
|
|
|
ctx->gc_state = 0;
|
|
|
|
|
|
|
|
vd->vdev_tsd = ctx;
|
|
|
|
|
|
|
|
kthread_create(vdev_geom_worker, ctx, NULL, 0, 0, "vdev:worker %s",
|
|
|
|
pp->name);
|
|
|
|
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
vdev_geom_close(vdev_t *vd)
|
|
|
|
{
|
|
|
|
vdev_geom_ctx_t *ctx;
|
|
|
|
struct g_consumer *cp;
|
|
|
|
|
|
|
|
if ((ctx = vd->vdev_tsd) == NULL)
|
|
|
|
return;
|
|
|
|
if ((cp = ctx->gc_consumer) == NULL)
|
|
|
|
return;
|
|
|
|
vdev_geom_release(vd);
|
|
|
|
g_post_event(vdev_geom_detach, cp, M_WAITOK, NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
vdev_geom_io_intr(struct bio *bp)
|
|
|
|
{
|
|
|
|
vdev_geom_ctx_t *ctx;
|
|
|
|
zio_t *zio;
|
|
|
|
|
|
|
|
zio = bp->bio_caller1;
|
|
|
|
ctx = zio->io_vd->vdev_tsd;
|
|
|
|
|
|
|
|
mtx_lock(&ctx->gc_queue_mtx);
|
|
|
|
bioq_insert_tail(&ctx->gc_queue, bp);
|
|
|
|
wakeup_one(&ctx->gc_queue);
|
|
|
|
mtx_unlock(&ctx->gc_queue_mtx);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
vdev_geom_io_start(zio_t *zio)
|
|
|
|
{
|
|
|
|
vdev_t *vd;
|
|
|
|
vdev_geom_ctx_t *ctx;
|
|
|
|
struct g_consumer *cp;
|
|
|
|
struct bio *bp;
|
|
|
|
int error;
|
|
|
|
|
|
|
|
cp = NULL;
|
|
|
|
|
|
|
|
vd = zio->io_vd;
|
|
|
|
ctx = vd->vdev_tsd;
|
|
|
|
if (ctx != NULL)
|
|
|
|
cp = ctx->gc_consumer;
|
|
|
|
|
|
|
|
if (zio->io_type == ZIO_TYPE_IOCTL) {
|
|
|
|
zio_vdev_io_bypass(zio);
|
|
|
|
|
|
|
|
/* XXPOLICY */
|
|
|
|
if (vdev_is_dead(vd)) {
|
|
|
|
zio->io_error = ENXIO;
|
|
|
|
zio_next_stage_async(zio);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
switch (zio->io_cmd) {
|
|
|
|
|
|
|
|
case DKIOCFLUSHWRITECACHE:
|
|
|
|
if (vd->vdev_nowritecache) {
|
|
|
|
zio->io_error = ENOTSUP;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
goto sendreq;
|
|
|
|
default:
|
|
|
|
zio->io_error = ENOTSUP;
|
|
|
|
}
|
|
|
|
|
|
|
|
zio_next_stage_async(zio);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio) == 0)
|
|
|
|
return;
|
|
|
|
|
|
|
|
if ((zio = vdev_queue_io(zio)) == NULL)
|
|
|
|
return;
|
|
|
|
|
|
|
|
sendreq:
|
|
|
|
|
|
|
|
error = vdev_is_dead(vd) ? ENXIO : vdev_error_inject(vd, zio);
|
|
|
|
if (error == 0 && cp == NULL)
|
|
|
|
error = ENXIO;
|
|
|
|
if (error) {
|
|
|
|
zio->io_error = error;
|
|
|
|
zio_next_stage_async(zio);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
bp = g_alloc_bio();
|
|
|
|
bp->bio_caller1 = zio;
|
|
|
|
switch (zio->io_type) {
|
|
|
|
case ZIO_TYPE_READ:
|
|
|
|
case ZIO_TYPE_WRITE:
|
|
|
|
bp->bio_cmd = zio->io_type == ZIO_TYPE_READ ? BIO_READ : BIO_WRITE;
|
|
|
|
bp->bio_data = zio->io_data;
|
|
|
|
bp->bio_offset = zio->io_offset;
|
|
|
|
bp->bio_length = zio->io_size;
|
|
|
|
break;
|
|
|
|
case ZIO_TYPE_IOCTL:
|
|
|
|
bp->bio_cmd = BIO_FLUSH;
|
|
|
|
bp->bio_data = NULL;
|
|
|
|
bp->bio_offset = cp->provider->mediasize;
|
|
|
|
bp->bio_length = 0;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
bp->bio_done = vdev_geom_io_intr;
|
|
|
|
|
|
|
|
g_io_request(bp, cp);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
vdev_geom_io_done(zio_t *zio)
|
|
|
|
{
|
|
|
|
vdev_queue_io_done(zio);
|
|
|
|
|
|
|
|
if (zio->io_type == ZIO_TYPE_WRITE)
|
|
|
|
vdev_cache_write(zio);
|
|
|
|
|
|
|
|
if (zio_injection_enabled && zio->io_error == 0)
|
|
|
|
zio->io_error = zio_handle_device_injection(zio->io_vd, EIO);
|
|
|
|
|
|
|
|
zio_next_stage(zio);
|
|
|
|
}
|
|
|
|
|
|
|
|
vdev_ops_t vdev_geom_ops = {
|
|
|
|
vdev_geom_open,
|
|
|
|
vdev_geom_close,
|
|
|
|
vdev_default_asize,
|
|
|
|
vdev_geom_io_start,
|
|
|
|
vdev_geom_io_done,
|
|
|
|
NULL,
|
|
|
|
VDEV_TYPE_DISK, /* name of this vdev type */
|
|
|
|
B_TRUE /* leaf vdev */
|
|
|
|
};
|