480 lines
12 KiB
C
480 lines
12 KiB
C
/*-
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* Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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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 AUTHORS 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 AUTHORS 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/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/bio.h>
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#include <sys/sysctl.h>
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#include <sys/malloc.h>
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#include <geom/geom.h>
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#include <geom/nop/g_nop.h>
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SYSCTL_DECL(_kern_geom);
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SYSCTL_NODE(_kern_geom, OID_AUTO, nop, CTLFLAG_RW, 0, "GEOM_NOP stuff");
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static u_int g_nop_debug = 0;
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SYSCTL_UINT(_kern_geom_nop, OID_AUTO, debug, CTLFLAG_RW, &g_nop_debug, 0,
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"Debug level");
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static int g_nop_destroy(struct g_geom *gp, boolean_t force);
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static int g_nop_destroy_geom(struct gctl_req *req, struct g_class *mp,
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struct g_geom *gp);
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static void g_nop_config(struct gctl_req *req, struct g_class *mp,
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const char *verb);
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static void g_nop_dumpconf(struct sbuf *sb, const char *indent,
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struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp);
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struct g_class g_nop_class = {
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.name = G_NOP_CLASS_NAME,
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.ctlreq = g_nop_config,
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.destroy_geom = g_nop_destroy_geom
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};
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static void
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g_nop_orphan(struct g_consumer *cp)
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{
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g_topology_assert();
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g_nop_destroy(cp->geom, 1);
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}
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static void
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g_nop_start(struct bio *bp)
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{
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struct g_nop_softc *sc;
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struct g_geom *gp;
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struct g_provider *pp;
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struct bio *cbp;
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gp = bp->bio_to->geom;
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sc = gp->softc;
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G_NOP_LOGREQ(bp, "Request received.");
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cbp = g_clone_bio(bp);
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if (cbp == NULL) {
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g_io_deliver(bp, ENOMEM);
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return;
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}
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pp = LIST_FIRST(&gp->provider);
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KASSERT(pp != NULL, ("NULL pp"));
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if (sc->sc_failprob > 0) {
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u_int rval;
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rval = arc4random() % 100;
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if (rval < sc->sc_failprob) {
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g_io_deliver(bp, EIO);
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return;
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}
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}
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cbp->bio_done = g_std_done;
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cbp->bio_offset = bp->bio_offset + sc->sc_offset;
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cbp->bio_data = bp->bio_data;
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cbp->bio_length = bp->bio_length;
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cbp->bio_to = LIST_FIRST(&gp->provider);
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G_NOP_LOGREQ(cbp, "Sending request.");
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g_io_request(cbp, LIST_FIRST(&gp->consumer));
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}
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static int
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g_nop_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;
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int error;
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gp = pp->geom;
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cp = LIST_FIRST(&gp->consumer);
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error = g_access(cp, dr, dw, de);
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return (error);
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}
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static int
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g_nop_create(struct gctl_req *req, struct g_class *mp, struct g_provider *pp,
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u_int failprob, off_t offset, off_t size)
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{
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struct g_nop_softc *sc;
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struct g_geom *gp;
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struct g_provider *newpp;
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struct g_consumer *cp;
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char name[64];
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int error;
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g_topology_assert();
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gp = NULL;
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newpp = NULL;
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cp = NULL;
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if ((offset % pp->sectorsize) != 0) {
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gctl_error(req, "Invalid offset for provider %s.", pp->name);
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return (EINVAL);
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}
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if ((size % pp->sectorsize) != 0) {
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gctl_error(req, "Invalid size for provider %s.", pp->name);
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return (EINVAL);
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}
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if (offset >= pp->mediasize) {
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gctl_error(req, "Invalid offset for provider %s.", pp->name);
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return (EINVAL);
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}
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if (size == 0)
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size = pp->mediasize - offset;
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if (offset + size > pp->mediasize) {
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gctl_error(req, "Invalid size for provider %s.", pp->name);
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return (EINVAL);
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}
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snprintf(name, sizeof(name), "%s%s", pp->name, G_NOP_SUFFIX);
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LIST_FOREACH(gp, &mp->geom, geom) {
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if (strcmp(gp->name, name) == 0) {
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gctl_error(req, "Provider %s already exists.", name);
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return (EEXIST);
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}
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}
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gp = g_new_geomf(mp, name);
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if (gp == NULL) {
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gctl_error(req, "Cannot create geom %s.", name);
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return (ENOMEM);
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}
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sc = g_malloc(sizeof(*sc), M_WAITOK);
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sc->sc_offset = offset;
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sc->sc_failprob = failprob;
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gp->softc = sc;
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gp->start = g_nop_start;
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gp->spoiled = g_nop_orphan;
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gp->orphan = g_nop_orphan;
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gp->access = g_nop_access;
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gp->dumpconf = g_nop_dumpconf;
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newpp = g_new_providerf(gp, gp->name);
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if (newpp == NULL) {
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gctl_error(req, "Cannot create provider %s.", name);
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error = ENOMEM;
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goto fail;
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}
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newpp->mediasize = size;
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newpp->sectorsize = pp->sectorsize;
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cp = g_new_consumer(gp);
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if (cp == NULL) {
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gctl_error(req, "Cannot create consumer for %s.", gp->name);
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error = ENOMEM;
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goto fail;
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}
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error = g_attach(cp, pp);
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if (error != 0) {
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gctl_error(req, "Cannot attach to provider %s.", pp->name);
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goto fail;
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}
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g_error_provider(newpp, 0);
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G_NOP_DEBUG(0, "Device %s created.", gp->name);
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return (0);
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fail:
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if (cp != NULL) {
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if (cp->provider != NULL)
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g_detach(cp);
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g_destroy_consumer(cp);
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}
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if (newpp != NULL)
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g_destroy_provider(pp);
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if (gp != NULL) {
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if (gp->softc != NULL)
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g_free(gp->softc);
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g_destroy_geom(gp);
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}
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return (error);
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}
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static int
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g_nop_destroy(struct g_geom *gp, boolean_t force)
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{
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struct g_provider *pp;
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g_topology_assert();
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pp = LIST_FIRST(&gp->provider);
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if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
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if (force) {
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G_NOP_DEBUG(0, "Device %s is still open, so it "
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"can't be definitely removed.", pp->name);
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} else {
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G_NOP_DEBUG(1, "Device %s is still open (r%dw%de%d).",
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pp->name, pp->acr, pp->acw, pp->ace);
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return (EBUSY);
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}
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} else {
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G_NOP_DEBUG(0, "Device %s removed.", gp->name);
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}
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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 int
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g_nop_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp)
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{
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return (g_nop_destroy(gp, 0));
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}
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static void
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g_nop_ctl_create(struct gctl_req *req, struct g_class *mp)
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{
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struct g_provider *pp;
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intmax_t *failprob, *offset, *size;
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const char *name;
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char param[16];
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int i, *nargs;
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g_topology_assert();
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nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
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if (nargs == NULL) {
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gctl_error(req, "No '%s' argument", "nargs");
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return;
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}
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if (*nargs <= 0) {
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gctl_error(req, "Missing device(s).");
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return;
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}
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failprob = gctl_get_paraml(req, "failprob", sizeof(*failprob));
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if (failprob == NULL) {
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gctl_error(req, "No '%s' argument", "failprob");
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return;
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}
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if (*failprob < 0 || *failprob > 100) {
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gctl_error(req, "Invalid '%s' argument", "failprob");
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return;
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}
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offset = gctl_get_paraml(req, "offset", sizeof(*offset));
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if (offset == NULL) {
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gctl_error(req, "No '%s' argument", "offset");
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return;
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}
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if (*offset < 0) {
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gctl_error(req, "Invalid '%s' argument", "offset");
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return;
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}
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size = gctl_get_paraml(req, "size", sizeof(*size));
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if (size == NULL) {
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gctl_error(req, "No '%s' argument", "size");
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return;
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}
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if (*size < 0) {
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gctl_error(req, "Invalid '%s' argument", "size");
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return;
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}
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for (i = 0; i < *nargs; i++) {
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snprintf(param, sizeof(param), "arg%d", i);
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name = gctl_get_asciiparam(req, param);
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if (name == NULL) {
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gctl_error(req, "No 'arg%d' argument", i);
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return;
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}
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if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
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name += strlen("/dev/");
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pp = g_provider_by_name(name);
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if (pp == NULL) {
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G_NOP_DEBUG(1, "Provider %s is invalid.", name);
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gctl_error(req, "Provider %s is invalid.", name);
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return;
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}
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if (g_nop_create(req, mp, pp, (u_int)*failprob, (off_t)*offset,
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(off_t)*size) != 0) {
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return;
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}
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}
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}
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static void
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g_nop_ctl_configure(struct gctl_req *req, struct g_class *mp)
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{
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struct g_nop_softc *sc;
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struct g_provider *pp;
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intmax_t *failprob;
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const char *name;
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char param[16];
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int i, *nargs;
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g_topology_assert();
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nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
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if (nargs == NULL) {
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gctl_error(req, "No '%s' argument", "nargs");
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return;
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}
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if (*nargs <= 0) {
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gctl_error(req, "Missing device(s).");
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return;
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}
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failprob = gctl_get_paraml(req, "failprob", sizeof(*failprob));
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if (failprob == NULL) {
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gctl_error(req, "No '%s' argument", "failprob");
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return;
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}
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if (*failprob < 0 || *failprob > 100) {
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gctl_error(req, "Invalid '%s' argument", "failprob");
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return;
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}
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for (i = 0; i < *nargs; i++) {
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snprintf(param, sizeof(param), "arg%d", i);
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name = gctl_get_asciiparam(req, param);
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if (name == NULL) {
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gctl_error(req, "No 'arg%d' argument", i);
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return;
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}
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if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
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name += strlen("/dev/");
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pp = g_provider_by_name(name);
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if (pp == NULL || pp->geom->class != mp) {
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G_NOP_DEBUG(1, "Provider %s is invalid.", name);
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gctl_error(req, "Provider %s is invalid.", name);
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return;
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}
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sc = pp->geom->softc;
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sc->sc_failprob = (u_int)*failprob;
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}
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}
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static struct g_geom *
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g_nop_find_geom(struct g_class *mp, const char *name)
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{
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struct g_geom *gp;
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LIST_FOREACH(gp, &mp->geom, geom) {
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if (strcmp(gp->name, name) == 0)
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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 void
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g_nop_ctl_destroy(struct gctl_req *req, struct g_class *mp)
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{
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int *nargs, *force, error, i;
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struct g_geom *gp;
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const char *name;
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char param[16];
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g_topology_assert();
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nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
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if (nargs == NULL) {
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gctl_error(req, "No '%s' argument", "nargs");
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return;
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}
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if (*nargs <= 0) {
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gctl_error(req, "Missing device(s).");
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return;
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}
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force = gctl_get_paraml(req, "force", sizeof(*force));
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if (force == NULL) {
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gctl_error(req, "No 'force' argument");
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return;
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}
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for (i = 0; i < *nargs; i++) {
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snprintf(param, sizeof(param), "arg%d", i);
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name = gctl_get_asciiparam(req, param);
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if (name == NULL) {
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gctl_error(req, "No 'arg%d' argument", i);
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return;
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}
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if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
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name += strlen("/dev/");
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gp = g_nop_find_geom(mp, name);
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if (gp == NULL) {
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G_NOP_DEBUG(1, "Device %s is invalid.", name);
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gctl_error(req, "Device %s is invalid.", name);
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return;
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}
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error = g_nop_destroy(gp, *force);
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if (error != 0) {
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gctl_error(req, "Cannot destroy device %s (error=%d).",
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gp->name, error);
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return;
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}
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}
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}
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static void
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g_nop_config(struct gctl_req *req, struct g_class *mp, const char *verb)
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{
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uint32_t *version;
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g_topology_assert();
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version = gctl_get_paraml(req, "version", sizeof(*version));
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if (version == NULL) {
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gctl_error(req, "No '%s' argument.", "version");
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return;
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}
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if (*version != G_NOP_VERSION) {
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gctl_error(req, "Userland and kernel parts are out of sync.");
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return;
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}
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if (strcmp(verb, "create") == 0) {
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g_nop_ctl_create(req, mp);
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return;
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} else if (strcmp(verb, "configure") == 0) {
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g_nop_ctl_configure(req, mp);
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return;
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} else if (strcmp(verb, "destroy") == 0) {
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g_nop_ctl_destroy(req, mp);
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return;
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}
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gctl_error(req, "Unknown verb.");
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}
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static void
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g_nop_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
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struct g_consumer *cp, struct g_provider *pp)
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{
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struct g_nop_softc *sc;
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if (pp != NULL || cp != NULL)
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return;
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sc = gp->softc;
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sbuf_printf(sb, "%s<Offset>%jd</Offset>\n", indent,
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(intmax_t)sc->sc_offset);
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sbuf_printf(sb, "%s<Failprob>%u</Failprob>\n", indent, sc->sc_failprob);
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}
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DECLARE_GEOM_CLASS(g_nop_class, g_nop);
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