| Current Path : /usr/src/sys/geom/label/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/sys/geom/label/g_label.c |
/*-
* Copyright (c) 2004-2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/geom/label/g_label.c 221433 2011-05-04 12:59:11Z ae $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/bio.h>
#include <sys/malloc.h>
#include <sys/libkern.h>
#include <sys/sysctl.h>
#include <geom/geom.h>
#include <geom/geom_slice.h>
#include <geom/label/g_label.h>
FEATURE(geom_label, "GEOM labeling support");
SYSCTL_DECL(_kern_geom);
SYSCTL_NODE(_kern_geom, OID_AUTO, label, CTLFLAG_RW, 0, "GEOM_LABEL stuff");
u_int g_label_debug = 0;
TUNABLE_INT("kern.geom.label.debug", &g_label_debug);
SYSCTL_UINT(_kern_geom_label, OID_AUTO, debug, CTLFLAG_RW, &g_label_debug, 0,
"Debug level");
static int g_label_destroy_geom(struct gctl_req *req, struct g_class *mp,
struct g_geom *gp);
static int g_label_destroy(struct g_geom *gp, boolean_t force);
static struct g_geom *g_label_taste(struct g_class *mp, struct g_provider *pp,
int flags __unused);
static void g_label_config(struct gctl_req *req, struct g_class *mp,
const char *verb);
struct g_class g_label_class = {
.name = G_LABEL_CLASS_NAME,
.version = G_VERSION,
.ctlreq = g_label_config,
.taste = g_label_taste,
.destroy_geom = g_label_destroy_geom
};
/*
* To add a new file system where you want to look for volume labels,
* you have to:
* 1. Add a file g_label_<file system>.c which implements labels recognition.
* 2. Add an 'extern const struct g_label_desc g_label_<file system>;' into
* g_label.h file.
* 3. Add an element to the table below '&g_label_<file system>,'.
* 4. Add your file to sys/conf/files.
* 5. Add your file to sys/modules/geom/geom_label/Makefile.
* 6. Add your file system to manual page sbin/geom/class/label/glabel.8.
*/
const struct g_label_desc *g_labels[] = {
&g_label_ufs_id,
&g_label_ufs_volume,
&g_label_iso9660,
&g_label_msdosfs,
&g_label_ext2fs,
&g_label_reiserfs,
&g_label_ntfs,
&g_label_gpt,
&g_label_gpt_uuid,
NULL
};
static int
g_label_destroy_geom(struct gctl_req *req __unused, struct g_class *mp,
struct g_geom *gp __unused)
{
/*
* XXX: Unloading a class which is using geom_slice:1.56 is currently
* XXX: broken, so we deny unloading when we have geoms.
*/
return (EOPNOTSUPP);
}
static void
g_label_orphan(struct g_consumer *cp)
{
G_LABEL_DEBUG(1, "Label %s removed.",
LIST_FIRST(&cp->geom->provider)->name);
g_slice_orphan(cp);
}
static void
g_label_spoiled(struct g_consumer *cp)
{
G_LABEL_DEBUG(1, "Label %s removed.",
LIST_FIRST(&cp->geom->provider)->name);
g_slice_spoiled(cp);
}
static int
g_label_is_name_ok(const char *label)
{
const char *s;
/* Check if the label starts from ../ */
if (strncmp(label, "../", 3) == 0)
return (0);
/* Check if the label contains /../ */
if (strstr(label, "/../") != NULL)
return (0);
/* Check if the label ends at ../ */
if ((s = strstr(label, "/..")) != NULL && s[3] == '\0')
return (0);
return (1);
}
static struct g_geom *
g_label_create(struct gctl_req *req, struct g_class *mp, struct g_provider *pp,
const char *label, const char *dir, off_t mediasize)
{
struct g_geom *gp;
struct g_provider *pp2;
struct g_consumer *cp;
char name[64];
g_topology_assert();
if (!g_label_is_name_ok(label)) {
G_LABEL_DEBUG(0, "%s contains suspicious label, skipping.",
pp->name);
G_LABEL_DEBUG(1, "%s suspicious label is: %s", pp->name, label);
if (req != NULL)
gctl_error(req, "Label name %s is invalid.", label);
return (NULL);
}
gp = NULL;
cp = NULL;
snprintf(name, sizeof(name), "%s/%s", dir, label);
LIST_FOREACH(gp, &mp->geom, geom) {
pp2 = LIST_FIRST(&gp->provider);
if (pp2 == NULL)
continue;
if ((pp2->flags & G_PF_ORPHAN) != 0)
continue;
if (strcmp(pp2->name, name) == 0) {
G_LABEL_DEBUG(1, "Label %s(%s) already exists (%s).",
label, name, pp->name);
if (req != NULL) {
gctl_error(req, "Provider %s already exists.",
name);
}
return (NULL);
}
}
gp = g_slice_new(mp, 1, pp, &cp, NULL, 0, NULL);
if (gp == NULL) {
G_LABEL_DEBUG(0, "Cannot create slice %s.", label);
if (req != NULL)
gctl_error(req, "Cannot create slice %s.", label);
return (NULL);
}
gp->orphan = g_label_orphan;
gp->spoiled = g_label_spoiled;
g_access(cp, -1, 0, 0);
g_slice_config(gp, 0, G_SLICE_CONFIG_SET, (off_t)0, mediasize,
pp->sectorsize, name);
G_LABEL_DEBUG(1, "Label for provider %s is %s.", pp->name, name);
return (gp);
}
static int
g_label_destroy(struct g_geom *gp, boolean_t force)
{
struct g_provider *pp;
g_topology_assert();
pp = LIST_FIRST(&gp->provider);
if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
if (force) {
G_LABEL_DEBUG(0, "Provider %s is still open, so it "
"can't be definitely removed.", pp->name);
} else {
G_LABEL_DEBUG(1,
"Provider %s is still open (r%dw%de%d).", pp->name,
pp->acr, pp->acw, pp->ace);
return (EBUSY);
}
} else if (pp != NULL)
G_LABEL_DEBUG(1, "Label %s removed.", pp->name);
g_slice_spoiled(LIST_FIRST(&gp->consumer));
return (0);
}
static int
g_label_read_metadata(struct g_consumer *cp, struct g_label_metadata *md)
{
struct g_provider *pp;
u_char *buf;
int error;
g_topology_assert();
pp = cp->provider;
g_topology_unlock();
buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
&error);
g_topology_lock();
if (buf == NULL)
return (error);
/* Decode metadata. */
label_metadata_decode(buf, md);
g_free(buf);
return (0);
}
static void
g_label_orphan_taste(struct g_consumer *cp __unused)
{
KASSERT(1 == 0, ("%s called?", __func__));
}
static void
g_label_start_taste(struct bio *bp __unused)
{
KASSERT(1 == 0, ("%s called?", __func__));
}
static int
g_label_access_taste(struct g_provider *pp __unused, int dr __unused,
int dw __unused, int de __unused)
{
KASSERT(1 == 0, ("%s called", __func__));
return (EOPNOTSUPP);
}
static struct g_geom *
g_label_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
{
struct g_label_metadata md;
struct g_consumer *cp;
struct g_geom *gp;
int i;
g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
g_topology_assert();
G_LABEL_DEBUG(2, "Tasting %s.", pp->name);
/* Skip providers that are already open for writing. */
if (pp->acw > 0)
return (NULL);
if (strcmp(pp->geom->class->name, mp->name) == 0)
return (NULL);
gp = g_new_geomf(mp, "label:taste");
gp->start = g_label_start_taste;
gp->access = g_label_access_taste;
gp->orphan = g_label_orphan_taste;
cp = g_new_consumer(gp);
g_attach(cp, pp);
if (g_access(cp, 1, 0, 0) != 0)
goto end;
do {
if (g_label_read_metadata(cp, &md) != 0)
break;
if (strcmp(md.md_magic, G_LABEL_MAGIC) != 0)
break;
if (md.md_version > G_LABEL_VERSION) {
printf("geom_label.ko module is too old to handle %s.\n",
pp->name);
break;
}
/*
* Backward compatibility:
*/
/*
* There was no md_provsize field in earlier versions of
* metadata.
*/
if (md.md_version < 2)
md.md_provsize = pp->mediasize;
if (md.md_provsize != pp->mediasize)
break;
g_label_create(NULL, mp, pp, md.md_label, G_LABEL_DIR,
pp->mediasize - pp->sectorsize);
} while (0);
for (i = 0; g_labels[i] != NULL; i++) {
char label[64];
if (g_labels[i]->ld_enabled == 0)
continue;
g_topology_unlock();
g_labels[i]->ld_taste(cp, label, sizeof(label));
g_topology_lock();
if (label[0] == '\0')
continue;
g_label_create(NULL, mp, pp, label, g_labels[i]->ld_dir,
pp->mediasize);
}
g_access(cp, -1, 0, 0);
end:
g_detach(cp);
g_destroy_consumer(cp);
g_destroy_geom(gp);
return (NULL);
}
static void
g_label_ctl_create(struct gctl_req *req, struct g_class *mp)
{
struct g_provider *pp;
const char *name;
int *nargs;
g_topology_assert();
nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
if (nargs == NULL) {
gctl_error(req, "No '%s' argument", "nargs");
return;
}
if (*nargs != 2) {
gctl_error(req, "Invalid number of arguments.");
return;
}
/*
* arg1 is the name of provider.
*/
name = gctl_get_asciiparam(req, "arg1");
if (name == NULL) {
gctl_error(req, "No 'arg%d' argument", 1);
return;
}
if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
name += strlen("/dev/");
pp = g_provider_by_name(name);
if (pp == NULL) {
G_LABEL_DEBUG(1, "Provider %s is invalid.", name);
gctl_error(req, "Provider %s is invalid.", name);
return;
}
/*
* arg0 is the label.
*/
name = gctl_get_asciiparam(req, "arg0");
if (name == NULL) {
gctl_error(req, "No 'arg%d' argument", 0);
return;
}
g_label_create(req, mp, pp, name, G_LABEL_DIR, pp->mediasize);
}
static const char *
g_label_skip_dir(const char *name)
{
char path[64];
u_int i;
if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
name += strlen("/dev/");
if (strncmp(name, G_LABEL_DIR "/", strlen(G_LABEL_DIR "/")) == 0)
name += strlen(G_LABEL_DIR "/");
for (i = 0; g_labels[i] != NULL; i++) {
snprintf(path, sizeof(path), "%s/", g_labels[i]->ld_dir);
if (strncmp(name, path, strlen(path)) == 0) {
name += strlen(path);
break;
}
}
return (name);
}
static struct g_geom *
g_label_find_geom(struct g_class *mp, const char *name)
{
struct g_geom *gp;
struct g_provider *pp;
const char *pname;
name = g_label_skip_dir(name);
LIST_FOREACH(gp, &mp->geom, geom) {
pp = LIST_FIRST(&gp->provider);
pname = g_label_skip_dir(pp->name);
if (strcmp(pname, name) == 0)
return (gp);
}
return (NULL);
}
static void
g_label_ctl_destroy(struct gctl_req *req, struct g_class *mp)
{
int *nargs, *force, error, i;
struct g_geom *gp;
const char *name;
char param[16];
g_topology_assert();
nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
if (nargs == NULL) {
gctl_error(req, "No '%s' argument", "nargs");
return;
}
if (*nargs <= 0) {
gctl_error(req, "Missing device(s).");
return;
}
force = gctl_get_paraml(req, "force", sizeof(*force));
if (force == NULL) {
gctl_error(req, "No 'force' argument");
return;
}
for (i = 0; i < *nargs; i++) {
snprintf(param, sizeof(param), "arg%d", i);
name = gctl_get_asciiparam(req, param);
if (name == NULL) {
gctl_error(req, "No 'arg%d' argument", i);
return;
}
gp = g_label_find_geom(mp, name);
if (gp == NULL) {
G_LABEL_DEBUG(1, "Label %s is invalid.", name);
gctl_error(req, "Label %s is invalid.", name);
return;
}
error = g_label_destroy(gp, *force);
if (error != 0) {
gctl_error(req, "Cannot destroy label %s (error=%d).",
LIST_FIRST(&gp->provider)->name, error);
return;
}
}
}
static void
g_label_config(struct gctl_req *req, struct g_class *mp, const char *verb)
{
uint32_t *version;
g_topology_assert();
version = gctl_get_paraml(req, "version", sizeof(*version));
if (version == NULL) {
gctl_error(req, "No '%s' argument.", "version");
return;
}
if (*version != G_LABEL_VERSION) {
gctl_error(req, "Userland and kernel parts are out of sync.");
return;
}
if (strcmp(verb, "create") == 0) {
g_label_ctl_create(req, mp);
return;
} else if (strcmp(verb, "destroy") == 0 ||
strcmp(verb, "stop") == 0) {
g_label_ctl_destroy(req, mp);
return;
}
gctl_error(req, "Unknown verb.");
}
DECLARE_GEOM_CLASS(g_label_class, g_label);