409 lines
10 KiB
C
409 lines
10 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/geom_slice.h>
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#include <geom/label/g_label.h>
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SYSCTL_DECL(_kern_geom);
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SYSCTL_NODE(_kern_geom, OID_AUTO, label, CTLFLAG_RW, 0, "GEOM_LABEL stuff");
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u_int g_label_debug = 0;
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SYSCTL_UINT(_kern_geom_label, OID_AUTO, debug, CTLFLAG_RW, &g_label_debug, 0,
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"Debug level");
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static int g_label_destroy(struct g_geom *gp, boolean_t force);
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static struct g_geom *g_label_taste(struct g_class *mp, struct g_provider *pp,
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int flags __unused);
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static void g_label_config(struct gctl_req *req, struct g_class *mp,
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const char *verb);
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struct g_class g_label_class = {
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.name = G_LABEL_CLASS_NAME,
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.version = G_VERSION,
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.ctlreq = g_label_config,
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.taste = g_label_taste
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};
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/*
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* To add a new file system where you want to look for volume labels,
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* you have to:
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* 1. Add a file which implements looking for volume labels.
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* 2. Add an 'extern const struct g_label_desc g_label_<your file system>;'.
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* 3. Add an element to the table below '&g_label_<your_file_system>,'.
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*/
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const struct g_label_desc *g_labels[] = {
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&g_label_ufs,
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&g_label_iso9660,
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&g_label_msdosfs,
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NULL
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};
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static void
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g_label_orphan(struct g_consumer *cp __unused)
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{
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KASSERT(1 == 0, ("%s called?", __func__));
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}
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static void
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g_label_start(struct bio *bp __unused)
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{
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KASSERT(1 == 0, ("%s called?", __func__));
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}
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static int
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g_label_access(struct g_provider *pp __unused, int dr __unused, int dw __unused,
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int de __unused)
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{
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KASSERT(1 == 0, ("%s called", __func__));
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return (EOPNOTSUPP);
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}
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static struct g_geom *
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g_label_create(struct gctl_req *req, struct g_class *mp, struct g_provider *pp,
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const char *label, const char *dir, off_t mediasize)
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{
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struct g_geom *gp;
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struct g_provider *pp2;
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struct g_consumer *cp;
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char name[64];
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g_topology_assert();
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gp = NULL;
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cp = NULL;
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snprintf(name, sizeof(name), "%s/%s", dir, label);
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LIST_FOREACH(gp, &mp->geom, geom) {
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pp2 = LIST_FIRST(&gp->provider);
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if (pp2 == NULL)
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continue;
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if (strcmp(pp2->name, name) == 0) {
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G_LABEL_DEBUG(1, "Label %s(%s) already exists (%s).",
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label, name, pp->name);
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if (req != NULL) {
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gctl_error(req, "Provider %s already exists.",
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name);
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}
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return (NULL);
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}
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}
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gp = g_slice_new(mp, 1, pp, &cp, NULL, 0, NULL);
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if (gp == NULL) {
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G_LABEL_DEBUG(0, "Cannot create slice %s.", label);
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if (req != NULL)
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gctl_error(req, "Cannot create slice %s.", label);
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return (NULL);
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}
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g_access(cp, -1, 0, 0);
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g_slice_config(gp, 0, G_SLICE_CONFIG_SET, (off_t)0, mediasize,
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pp->sectorsize, name);
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G_LABEL_DEBUG(0, "Label for provider %s is %s.", pp->name, name);
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return (gp);
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}
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static int
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g_label_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_LABEL_DEBUG(0, "Provider %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_LABEL_DEBUG(1,
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"Provider %s is still open (r%dw%de%d).", pp->name,
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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_LABEL_DEBUG(0, "Label %s removed.",
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LIST_FIRST(&gp->provider)->name);
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}
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g_slice_spoiled(LIST_FIRST(&gp->consumer));
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return (0);
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}
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static int
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g_label_read_metadata(struct g_consumer *cp, struct g_label_metadata *md)
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{
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struct g_provider *pp;
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u_char *buf;
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int error;
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g_topology_assert();
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pp = cp->provider;
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g_topology_unlock();
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buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
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&error);
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g_topology_lock();
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if (buf == NULL)
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return (error);
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/* Decode metadata. */
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label_metadata_decode(buf, md);
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g_free(buf);
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return (0);
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}
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static struct g_geom *
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g_label_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
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{
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struct g_label_metadata md;
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struct g_consumer *cp;
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struct g_geom *gp;
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int i;
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g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
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g_topology_assert();
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G_LABEL_DEBUG(2, "Tasting %s.", pp->name);
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/* Skip providers with 0 sectorsize. */
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if (pp->sectorsize == 0)
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return (NULL);
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if (strcmp(pp->geom->class->name, mp->name) == 0)
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return (NULL);
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gp = g_new_geomf(mp, "label:taste");
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gp->start = g_label_start;
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gp->access = g_label_access;
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gp->orphan = g_label_orphan;
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cp = g_new_consumer(gp);
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g_attach(cp, pp);
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if (g_access(cp, 1, 0, 0) != 0)
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goto end;
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do {
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if (g_label_read_metadata(cp, &md) != 0)
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break;
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if (strcmp(md.md_magic, G_LABEL_MAGIC) != 0)
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break;
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if (md.md_version > G_LABEL_VERSION) {
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printf("geom_label.ko module is too old to handle %s.\n",
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pp->name);
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break;
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}
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g_label_create(NULL, mp, pp, md.md_label, G_LABEL_DIR,
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pp->mediasize - pp->sectorsize);
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} while (0);
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for (i = 0; g_labels[i] != NULL; i++) {
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char label[64];
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g_topology_unlock();
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g_labels[i]->ld_taste(cp, label, sizeof(label));
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g_topology_lock();
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if (label[0] == '\0')
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continue;
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g_label_create(NULL, mp, pp, label, g_labels[i]->ld_dir,
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pp->mediasize);
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}
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g_access(cp, -1, 0, 0);
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end:
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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 void
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g_label_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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const char *name;
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int *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 != 2) {
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gctl_error(req, "Invalid number of argument.");
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return;
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}
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/*
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* arg1 is the name of provider.
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*/
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name = gctl_get_asciiparam(req, "arg1");
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if (name == NULL) {
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gctl_error(req, "No 'arg%d' argument", 1);
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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_LABEL_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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/*
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* arg0 is the label.
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*/
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name = gctl_get_asciiparam(req, "arg0");
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if (name == NULL) {
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gctl_error(req, "No 'arg%d' argument", 0);
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return;
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}
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g_label_create(req, mp, pp, name, G_LABEL_DIR, pp->mediasize);
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}
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static const char *
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g_label_skip_dir(const char *name)
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{
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char path[64];
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u_int i;
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if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
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name += strlen("/dev/");
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if (strncmp(name, G_LABEL_DIR "/", strlen(G_LABEL_DIR "/")) == 0)
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name += strlen(G_LABEL_DIR "/");
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for (i = 0; g_labels[i] != NULL; i++) {
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snprintf(path, sizeof(path), "%s/", g_labels[i]->ld_dir);
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if (strncmp(name, path, strlen(path)) == 0) {
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name += strlen(path);
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break;
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}
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}
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return (name);
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}
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static struct g_geom *
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g_label_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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struct g_provider *pp;
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const char *pname;
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name = g_label_skip_dir(name);
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LIST_FOREACH(gp, &mp->geom, geom) {
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pp = LIST_FIRST(&gp->provider);
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pname = g_label_skip_dir(pp->name);
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if (strcmp(pname, 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_label_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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gp = g_label_find_geom(mp, name);
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if (gp == NULL) {
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G_LABEL_DEBUG(1, "Label %s is invalid.", name);
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gctl_error(req, "Label %s is invalid.", name);
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return;
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}
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error = g_label_destroy(gp, *force);
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if (error != 0) {
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gctl_error(req, "Cannot destroy label %s (error=%d).",
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LIST_FIRST(&gp->provider)->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_label_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_LABEL_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_label_ctl_create(req, mp);
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return;
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} else if (strcmp(verb, "destroy") == 0 ||
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strcmp(verb, "stop") == 0) {
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g_label_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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DECLARE_GEOM_CLASS(g_label_class, g_label);
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