3728855a0f
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.
488 lines
11 KiB
C
488 lines
11 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 2003 Poul-Henning Kamp
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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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* 3. The names of the authors may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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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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* $FreeBSD$
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*/
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/* This is a GEOM module for handling path selection for multi-path
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* storage devices. It is named "fox" because it, like they, prefer
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* to have multiple exits to choose from.
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*
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sysctl.h>
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#include <sys/kernel.h>
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#include <sys/conf.h>
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#include <sys/bio.h>
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#include <sys/malloc.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/libkern.h>
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#include <sys/endian.h>
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#include <sys/md5.h>
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#include <sys/errno.h>
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#include <geom/geom.h>
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#define FOX_CLASS_NAME "FOX"
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#define FOX_MAGIC "GEOM::FOX"
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static int g_fox_once;
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FEATURE(geom_fox, "GEOM FOX redundant path mitigation support");
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struct g_fox_softc {
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off_t mediasize;
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u_int sectorsize;
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TAILQ_HEAD(, bio) queue;
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struct mtx lock;
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u_char magic[16];
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struct g_consumer *path;
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struct g_consumer *opath;
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int waiting;
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int cr, cw, ce;
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};
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/*
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* This function is called whenever we need to select a new path.
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*/
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static void
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g_fox_select_path(void *arg, int flag)
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{
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struct g_geom *gp;
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struct g_fox_softc *sc;
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struct g_consumer *cp1;
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struct bio *bp;
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int error;
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g_topology_assert();
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if (flag == EV_CANCEL)
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return;
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gp = arg;
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sc = gp->softc;
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if (sc->opath != NULL) {
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/*
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* First, close the old path entirely.
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*/
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printf("Closing old path (%s) on fox (%s)\n",
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sc->opath->provider->name, gp->name);
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cp1 = LIST_NEXT(sc->opath, consumer);
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g_access(sc->opath, -sc->cr, -sc->cw, -(sc->ce + 1));
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/*
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* The attempt to reopen it with a exclusive count
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*/
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error = g_access(sc->opath, 0, 0, 1);
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if (error) {
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/*
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* Ok, ditch this consumer, we can't use it.
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*/
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printf("Drop old path (%s) on fox (%s)\n",
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sc->opath->provider->name, gp->name);
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g_detach(sc->opath);
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g_destroy_consumer(sc->opath);
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if (LIST_EMPTY(&gp->consumer)) {
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/* No consumers left */
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g_wither_geom(gp, ENXIO);
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for (;;) {
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bp = TAILQ_FIRST(&sc->queue);
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if (bp == NULL)
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break;
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TAILQ_REMOVE(&sc->queue, bp, bio_queue);
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bp->bio_error = ENXIO;
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g_std_done(bp);
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}
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return;
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}
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} else {
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printf("Got e-bit on old path (%s) on fox (%s)\n",
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sc->opath->provider->name, gp->name);
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}
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sc->opath = NULL;
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} else {
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cp1 = LIST_FIRST(&gp->consumer);
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}
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if (cp1 == NULL)
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cp1 = LIST_FIRST(&gp->consumer);
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printf("Open new path (%s) on fox (%s)\n",
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cp1->provider->name, gp->name);
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error = g_access(cp1, sc->cr, sc->cw, sc->ce);
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if (error) {
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/*
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* If we failed, we take another trip through here
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*/
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printf("Open new path (%s) on fox (%s) failed, reselect.\n",
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cp1->provider->name, gp->name);
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sc->opath = cp1;
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g_post_event(g_fox_select_path, gp, M_WAITOK, gp, NULL);
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} else {
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printf("Open new path (%s) on fox (%s) succeeded\n",
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cp1->provider->name, gp->name);
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mtx_lock(&sc->lock);
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sc->path = cp1;
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sc->waiting = 0;
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for (;;) {
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bp = TAILQ_FIRST(&sc->queue);
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if (bp == NULL)
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break;
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TAILQ_REMOVE(&sc->queue, bp, bio_queue);
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g_io_request(bp, sc->path);
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}
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mtx_unlock(&sc->lock);
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}
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}
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static void
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g_fox_orphan(struct g_consumer *cp)
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{
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struct g_geom *gp;
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struct g_fox_softc *sc;
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int error, mark;
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g_topology_assert();
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gp = cp->geom;
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sc = gp->softc;
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printf("Removing path (%s) from fox (%s)\n",
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cp->provider->name, gp->name);
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mtx_lock(&sc->lock);
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if (cp == sc->path) {
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sc->opath = NULL;
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sc->path = NULL;
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sc->waiting = 1;
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mark = 1;
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} else {
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mark = 0;
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}
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mtx_unlock(&sc->lock);
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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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g_detach(cp);
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g_destroy_consumer(cp);
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if (!LIST_EMPTY(&gp->consumer)) {
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if (mark)
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g_post_event(g_fox_select_path, gp, M_WAITOK, gp, NULL);
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return;
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}
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mtx_destroy(&sc->lock);
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g_free(gp->softc);
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gp->softc = NULL;
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g_wither_geom(gp, ENXIO);
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}
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static void
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g_fox_done(struct bio *bp)
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{
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struct g_geom *gp;
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struct g_fox_softc *sc;
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int error;
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if (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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gp = bp->bio_from->geom;
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sc = gp->softc;
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if (bp->bio_from != sc->path) {
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g_io_request(bp, sc->path);
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return;
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}
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mtx_lock(&sc->lock);
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sc->opath = sc->path;
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sc->path = NULL;
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error = g_post_event(g_fox_select_path, gp, M_NOWAIT, gp, NULL);
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if (error) {
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bp->bio_error = ENOMEM;
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g_std_done(bp);
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} else {
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sc->waiting = 1;
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TAILQ_INSERT_TAIL(&sc->queue, bp, bio_queue);
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}
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mtx_unlock(&sc->lock);
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}
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static void
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g_fox_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 g_fox_softc *sc;
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int error;
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gp = bp->bio_to->geom;
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sc = gp->softc;
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if (sc == NULL) {
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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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break;
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}
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bp2->bio_offset += sc->sectorsize;
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bp2->bio_done = g_fox_done;
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mtx_lock(&sc->lock);
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if (sc->path == NULL || !TAILQ_EMPTY(&sc->queue)) {
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if (sc->waiting == 0) {
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error = g_post_event(g_fox_select_path, gp,
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M_NOWAIT, gp, NULL);
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if (error) {
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g_destroy_bio(bp2);
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bp2 = NULL;
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g_io_deliver(bp, error);
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} else {
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sc->waiting = 1;
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}
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}
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if (bp2 != NULL)
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TAILQ_INSERT_TAIL(&sc->queue, bp2,
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bio_queue);
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} else {
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g_io_request(bp2, sc->path);
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}
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mtx_unlock(&sc->lock);
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break;
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default:
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g_io_deliver(bp, EOPNOTSUPP);
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break;
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}
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return;
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}
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static int
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g_fox_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_fox_softc *sc;
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struct g_consumer *cp1;
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int error;
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g_topology_assert();
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gp = pp->geom;
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sc = gp->softc;
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if (sc == NULL) {
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if (dr <= 0 && dw <= 0 && de <= 0)
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return (0);
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else
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return (ENXIO);
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}
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if (sc->cr == 0 && sc->cw == 0 && sc->ce == 0) {
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/*
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* First open, open all consumers with an exclusive bit
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*/
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error = 0;
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LIST_FOREACH(cp1, &gp->consumer, consumer) {
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error = g_access(cp1, 0, 0, 1);
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if (error) {
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printf("FOX: access(%s,0,0,1) = %d\n",
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cp1->provider->name, error);
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break;
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}
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}
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if (error) {
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LIST_FOREACH(cp1, &gp->consumer, consumer) {
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if (cp1->ace)
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g_access(cp1, 0, 0, -1);
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}
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return (error);
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}
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}
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if (sc->path == NULL)
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g_fox_select_path(gp, 0);
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if (sc->path == NULL)
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error = ENXIO;
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else
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error = g_access(sc->path, dr, dw, de);
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if (error == 0) {
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sc->cr += dr;
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sc->cw += dw;
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sc->ce += de;
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if (sc->cr == 0 && sc->cw == 0 && sc->ce == 0) {
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/*
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* Last close, remove e-bit on all consumers
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*/
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LIST_FOREACH(cp1, &gp->consumer, consumer)
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g_access(cp1, 0, 0, -1);
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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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g_fox_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
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{
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struct g_geom *gp, *gp2;
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struct g_provider *pp2;
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struct g_consumer *cp, *cp2;
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struct g_fox_softc *sc, *sc2;
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int error;
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u_int sectorsize;
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u_char *buf;
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g_trace(G_T_TOPOLOGY, "fox_taste(%s, %s)", mp->name, pp->name);
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g_topology_assert();
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if (!strcmp(pp->geom->class->name, mp->name))
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return (NULL);
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gp = g_new_geomf(mp, "%s.fox", pp->name);
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gp->softc = g_malloc(sizeof(struct g_fox_softc), M_WAITOK | M_ZERO);
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sc = gp->softc;
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cp = g_new_consumer(gp);
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g_attach(cp, pp);
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error = g_access(cp, 1, 0, 0);
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if (error) {
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g_free(sc);
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g_detach(cp);
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g_destroy_consumer(cp);
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g_destroy_geom(gp);
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return(NULL);
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}
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do {
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sectorsize = cp->provider->sectorsize;
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g_topology_unlock();
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buf = g_read_data(cp, 0, sectorsize, NULL);
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g_topology_lock();
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if (buf == NULL)
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break;
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if (memcmp(buf, FOX_MAGIC, strlen(FOX_MAGIC)))
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break;
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/*
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* First we need to see if this a new path for an existing fox.
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*/
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LIST_FOREACH(gp2, &mp->geom, geom) {
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sc2 = gp2->softc;
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if (sc2 == NULL)
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continue;
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if (memcmp(buf + 16, sc2->magic, sizeof sc2->magic))
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continue;
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break;
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}
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if (gp2 != NULL) {
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/*
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* It was. Create a new consumer for that fox,
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* attach it, and if the fox is open, open this
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* path with an exclusive count of one.
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*/
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printf("Adding path (%s) to fox (%s)\n",
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pp->name, gp2->name);
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cp2 = g_new_consumer(gp2);
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g_attach(cp2, pp);
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pp2 = LIST_FIRST(&gp2->provider);
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if (pp2->acr > 0 || pp2->acw > 0 || pp2->ace > 0) {
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error = g_access(cp2, 0, 0, 1);
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if (error) {
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/*
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* This is bad, or more likely,
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* the user is doing something stupid
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*/
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printf(
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"WARNING: New path (%s) to fox(%s) not added: %s\n%s",
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cp2->provider->name, gp2->name,
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"Could not get exclusive bit.",
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"WARNING: This indicates a risk of data inconsistency."
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);
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g_detach(cp2);
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g_destroy_consumer(cp2);
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}
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}
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break;
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}
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printf("Creating new fox (%s)\n", pp->name);
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sc->path = cp;
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memcpy(sc->magic, buf + 16, sizeof sc->magic);
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pp2 = g_new_providerf(gp, "%s", gp->name);
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pp2->mediasize = sc->mediasize = pp->mediasize - pp->sectorsize;
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pp2->sectorsize = sc->sectorsize = pp->sectorsize;
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printf("fox %s lock %p\n", gp->name, &sc->lock);
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mtx_init(&sc->lock, "fox queue", NULL, MTX_DEF);
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TAILQ_INIT(&sc->queue);
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g_error_provider(pp2, 0);
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} while (0);
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if (buf != NULL)
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g_free(buf);
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g_access(cp, -1, 0, 0);
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if (!LIST_EMPTY(&gp->provider)) {
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if (!g_fox_once) {
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g_fox_once = 1;
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printf(
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"WARNING: geom_fox (geom %s) is deprecated, "
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"use gmultipath instead.\n", gp->name);
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}
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return (gp);
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}
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g_free(gp->softc);
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g_detach(cp);
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g_destroy_consumer(cp);
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g_destroy_geom(gp);
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return (NULL);
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}
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static int
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g_fox_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp)
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{
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struct g_fox_softc *sc;
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g_topology_assert();
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sc = gp->softc;
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mtx_destroy(&sc->lock);
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g_free(gp->softc);
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gp->softc = NULL;
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g_wither_geom(gp, ENXIO);
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return (0);
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}
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static struct g_class g_fox_class = {
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.name = FOX_CLASS_NAME,
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.version = G_VERSION,
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.taste = g_fox_taste,
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.destroy_geom = g_fox_destroy_geom,
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.start = g_fox_start,
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.spoiled = g_fox_orphan,
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.orphan = g_fox_orphan,
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.access= g_fox_access,
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};
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DECLARE_GEOM_CLASS(g_fox_class, g_fox);
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