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head/lib/geom/multipath/geom_multipath.c

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2006 Mathew Jacob <mjacob@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("$FreeBSD$");
#include <sys/param.h>
#include <errno.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <strings.h>
#include <assert.h>
#include <libgeom.h>
#include <unistd.h>
#include <uuid.h>
#include <geom/multipath/g_multipath.h>
#include "core/geom.h"
#include "misc/subr.h"
uint32_t lib_version = G_LIB_VERSION;
uint32_t version = G_MULTIPATH_VERSION;
static void mp_main(struct gctl_req *, unsigned int);
static void mp_label(struct gctl_req *);
static void mp_clear(struct gctl_req *);
static void mp_prefer(struct gctl_req *);
struct g_command class_commands[] = {
{
"create", G_FLAG_VERBOSE | G_FLAG_LOADKLD, NULL,
{
{ 'A', "active_active", NULL, G_TYPE_BOOL },
{ 'R', "active_read", NULL, G_TYPE_BOOL },
G_OPT_SENTINEL
},
"[-vAR] name prov ..."
},
{
"label", G_FLAG_VERBOSE | G_FLAG_LOADKLD, mp_main,
{
{ 'A', "active_active", NULL, G_TYPE_BOOL },
{ 'R', "active_read", NULL, G_TYPE_BOOL },
G_OPT_SENTINEL
},
"[-vAR] name prov ..."
},
{ "configure", G_FLAG_VERBOSE, NULL,
{
{ 'A', "active_active", NULL, G_TYPE_BOOL },
{ 'P', "active_passive", NULL, G_TYPE_BOOL },
{ 'R', "active_read", NULL, G_TYPE_BOOL },
G_OPT_SENTINEL
},
"[-vAPR] name"
},
{
"add", G_FLAG_VERBOSE, NULL, G_NULL_OPTS,
"[-v] name prov"
},
{
"remove", G_FLAG_VERBOSE, NULL, G_NULL_OPTS,
"[-v] name prov"
},
{
"prefer", G_FLAG_VERBOSE, mp_main, G_NULL_OPTS,
"[-v] prov ..."
},
{
"fail", G_FLAG_VERBOSE, NULL, G_NULL_OPTS,
"[-v] name prov"
},
{
"restore", G_FLAG_VERBOSE, NULL, G_NULL_OPTS,
"[-v] name prov"
},
{
"rotate", G_FLAG_VERBOSE, NULL, G_NULL_OPTS,
"[-v] name"
},
{
"getactive", G_FLAG_VERBOSE, NULL, G_NULL_OPTS,
"[-v] name"
},
{
"destroy", G_FLAG_VERBOSE, NULL, G_NULL_OPTS,
"[-v] name"
},
{
"stop", G_FLAG_VERBOSE, NULL, G_NULL_OPTS,
"[-v] name"
},
{
"clear", G_FLAG_VERBOSE, mp_main, G_NULL_OPTS,
"[-v] prov ..."
},
G_CMD_SENTINEL
};
static void
mp_main(struct gctl_req *req, unsigned int flags __unused)
{
const char *name;
name = gctl_get_ascii(req, "verb");
if (name == NULL) {
gctl_error(req, "No '%s' argument.", "verb");
return;
}
if (strcmp(name, "label") == 0) {
mp_label(req);
} else if (strcmp(name, "clear") == 0) {
mp_clear(req);
} else if (strcmp(name, "prefer") == 0) {
mp_prefer(req);
} else {
gctl_error(req, "Unknown command: %s.", name);
}
}
static void
mp_label(struct gctl_req *req)
{
struct g_multipath_metadata md;
off_t disksize = 0, msize;
uint8_t *sector, *rsector;
char *ptr;
uuid_t uuid;
ssize_t secsize = 0, ssize;
uint32_t status;
const char *name, *name2, *mpname;
int error, i, nargs, fd;
nargs = gctl_get_int(req, "nargs");
if (nargs < 2) {
gctl_error(req, "wrong number of arguments.");
return;
}
/*
* First, check each provider to make sure it's the same size.
* This also gets us our size and sectorsize for the metadata.
*/
for (i = 1; i < nargs; i++) {
name = gctl_get_ascii(req, "arg%d", i);
msize = g_get_mediasize(name);
ssize = g_get_sectorsize(name);
if (msize == 0 || ssize == 0) {
gctl_error(req, "cannot get information about %s: %s.",
name, strerror(errno));
return;
}
if (i == 1) {
secsize = ssize;
disksize = msize;
} else {
if (secsize != ssize) {
gctl_error(req, "%s sector size %ju different.",
name, (intmax_t)ssize);
return;
}
if (disksize != msize) {
gctl_error(req, "%s media size %ju different.",
name, (intmax_t)msize);
return;
}
}
}
/*
* Generate metadata.
*/
strlcpy(md.md_magic, G_MULTIPATH_MAGIC, sizeof(md.md_magic));
md.md_version = G_MULTIPATH_VERSION;
mpname = gctl_get_ascii(req, "arg0");
strlcpy(md.md_name, mpname, sizeof(md.md_name));
md.md_size = disksize;
md.md_sectorsize = secsize;
uuid_create(&uuid, &status);
if (status != uuid_s_ok) {
gctl_error(req, "cannot create a UUID.");
return;
}
uuid_to_string(&uuid, &ptr, &status);
if (status != uuid_s_ok) {
gctl_error(req, "cannot stringify a UUID.");
return;
}
strlcpy(md.md_uuid, ptr, sizeof (md.md_uuid));
md.md_active_active = gctl_get_int(req, "active_active");
if (gctl_get_int(req, "active_read"))
md.md_active_active = 2;
free(ptr);
/*
* Allocate a sector to write as metadata.
*/
sector = calloc(1, secsize);
if (sector == NULL) {
gctl_error(req, "unable to allocate metadata buffer");
return;
}
rsector = malloc(secsize);
if (rsector == NULL) {
gctl_error(req, "unable to allocate metadata buffer");
goto done;
}
/*
* encode the metadata
*/
multipath_metadata_encode(&md, sector);
/*
* Store metadata on the initial provider.
*/
name = gctl_get_ascii(req, "arg1");
error = g_metadata_store(name, sector, secsize);
if (error != 0) {
gctl_error(req, "cannot store metadata on %s: %s.", name, strerror(error));
goto done;
}
/*
* Now touch the rest of the providers to hint retaste.
*/
for (i = 2; i < nargs; i++) {
name2 = gctl_get_ascii(req, "arg%d", i);
fd = g_open(name2, 1);
if (fd < 0) {
fprintf(stderr, "Unable to open %s: %s.\n",
name2, strerror(errno));
continue;
}
if (pread(fd, rsector, secsize, disksize - secsize) !=
(ssize_t)secsize) {
fprintf(stderr, "Unable to read metadata from %s: %s.\n",
name2, strerror(errno));
g_close(fd);
continue;
}
g_close(fd);
if (memcmp(sector, rsector, secsize)) {
fprintf(stderr, "No metadata found on %s."
" It is not a path of %s.\n",
name2, name);
}
}
done:
free(rsector);
free(sector);
}
static void
mp_clear(struct gctl_req *req)
{
const char *name;
int error, i, nargs;
nargs = gctl_get_int(req, "nargs");
if (nargs < 1) {
gctl_error(req, "Too few arguments.");
return;
}
for (i = 0; i < nargs; i++) {
name = gctl_get_ascii(req, "arg%d", i);
error = g_metadata_clear(name, G_MULTIPATH_MAGIC);
if (error != 0) {
fprintf(stderr, "Can't clear metadata on %s: %s.\n",
name, strerror(error));
gctl_error(req, "Not fully done.");
continue;
}
}
}
static void
mp_prefer(struct gctl_req *req)
{
const char *name, *comp, *errstr;
int nargs;
nargs = gctl_get_int(req, "nargs");
if (nargs != 2) {
gctl_error(req, "Usage: prefer GEOM PROVIDER");
return;
}
name = gctl_get_ascii(req, "arg0");
comp = gctl_get_ascii(req, "arg1");
errstr = gctl_issue (req);
if (errstr != NULL) {
fprintf(stderr, "Can't set %s preferred provider to %s: %s.\n",
name, comp, errstr);
}
}