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/* libguestfs - the guestfsd daemon
* Copyright (C) 2011 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <glob.h>
#include "daemon.h"
#include "actions.h"
#include "optgroups.h"
int
optgroup_mdadm_available (void)
{
return prog_exists ("mdadm");
}
static size_t
count_bits (uint64_t bitmap)
{
size_t c;
if (bitmap == 0)
return 0;
c = bitmap & 1 ? 1 : 0;
bitmap >>= 1;
return c + count_bits (bitmap);
}
/* Takes optional arguments, consult optargs_bitmask. */
int
do_mdadm_create (const char *name, char *const *devices,
int64_t missingbitmap, int nrdevices, int spare,
int64_t chunk, const char *level)
{
char nrdevices_s[32];
char spare_s[32];
char chunk_s[32];
size_t j;
int r;
char *err;
uint64_t umissingbitmap = (uint64_t) missingbitmap;
/* Check the optional parameters and set defaults where appropriate. */
if (!(optargs_bitmask & GUESTFS_MDADM_CREATE_MISSINGBITMAP_BITMASK))
umissingbitmap = 0;
if (optargs_bitmask & GUESTFS_MDADM_CREATE_SPARE_BITMASK) {
if (spare < 0) {
reply_with_error ("spare must not be negative");
return -1;
}
}
else
spare = 0;
if (optargs_bitmask & GUESTFS_MDADM_CREATE_NRDEVICES_BITMASK) {
if (nrdevices < 2) {
reply_with_error ("nrdevices is less than 2");
return -1;
}
}
else
nrdevices = count_strings (devices) + count_bits (umissingbitmap);
if (optargs_bitmask & GUESTFS_MDADM_CREATE_LEVEL_BITMASK) {
if (STRNEQ (level, "linear") && STRNEQ (level, "raid0") &&
STRNEQ (level, "0") && STRNEQ (level, "stripe") &&
STRNEQ (level, "raid1") && STRNEQ (level, "1") &&
STRNEQ (level, "mirror") &&
STRNEQ (level, "raid4") && STRNEQ (level, "4") &&
STRNEQ (level, "raid5") && STRNEQ (level, "5") &&
STRNEQ (level, "raid6") && STRNEQ (level, "6") &&
STRNEQ (level, "raid10") && STRNEQ (level, "10")) {
reply_with_error ("unknown level parameter: %s", level);
return -1;
}
}
else
level = "raid1";
if (optargs_bitmask & GUESTFS_MDADM_CREATE_CHUNK_BITMASK) {
/* chunk is bytes in the libguestfs API, but K when we pass it to mdadm */
if ((chunk & 1023) != 0) {
reply_with_error ("chunk size must be a multiple of 1024 bytes");
return -1;
}
}
/* Check invariant. */
if (count_strings (devices) + count_bits (umissingbitmap) !=
(size_t) (nrdevices + spare)) {
reply_with_error ("devices (%zu) + bits set in missingbitmap (%zu) is not equal to nrdevices (%d) + spare (%d)",
count_strings (devices), count_bits (umissingbitmap),
nrdevices, spare);
return -1;
}
size_t MAX_ARGS = nrdevices + 16;
const char *argv[MAX_ARGS];
size_t i = 0;
ADD_ARG (argv, i, "mdadm");
ADD_ARG (argv, i, "--create");
/* --run suppresses "Continue creating array" question */
ADD_ARG (argv, i, "--run");
ADD_ARG (argv, i, name);
ADD_ARG (argv, i, "--level");
ADD_ARG (argv, i, level);
ADD_ARG (argv, i, "--raid-devices");
snprintf (nrdevices_s, sizeof nrdevices_s, "%d", nrdevices);
ADD_ARG (argv, i, nrdevices_s);
if (optargs_bitmask & GUESTFS_MDADM_CREATE_SPARE_BITMASK) {
ADD_ARG (argv, i, "--spare-devices");
snprintf (spare_s, sizeof spare_s, "%d", spare);
ADD_ARG (argv, i, spare_s);
}
if (optargs_bitmask & GUESTFS_MDADM_CREATE_CHUNK_BITMASK) {
ADD_ARG (argv, i, "--chunk");
snprintf (chunk_s, sizeof chunk_s, "%" PRIi64, chunk / 1024);
ADD_ARG (argv, i, chunk_s);
}
/* Add devices and "missing". */
j = 0;
while (devices[j] != NULL || umissingbitmap != 0) {
if (umissingbitmap & 1)
ADD_ARG (argv, i, "missing");
else {
ADD_ARG (argv, i, devices[j]);
j++;
}
umissingbitmap >>= 1;
}
ADD_ARG (argv, i, NULL);
r = commandv (NULL, &err, argv);
if (r == -1) {
reply_with_error ("mdadm: %s: %s", name, err);
free (err);
return -1;
}
free (err);
udev_settle ();
return 0;
}
static int
glob_errfunc (const char *epath, int eerrno)
{
fprintf (stderr, "glob: failure reading %s: %s\n", epath, strerror (eerrno));
return 1;
}
char **
do_list_md_devices (void)
{
char **r = NULL;
int size = 0, alloc = 0;
glob_t mds;
memset(&mds, 0, sizeof(mds));
#define PREFIX "/sys/block/md"
#define SUFFIX "/md"
/* Look for directories under /sys/block matching md[0-9]*
* As an additional check, we also make sure they have a md subdirectory.
*/
int err = glob (PREFIX "[0-9]*" SUFFIX, GLOB_ERR, glob_errfunc, &mds);
if (err == GLOB_NOSPACE) {
reply_with_error ("glob: returned GLOB_NOSPACE: "
"rerun with LIBGUESTFS_DEBUG=1");
goto error;
} else if (err == GLOB_ABORTED) {
reply_with_error ("glob: returned GLOB_ABORTED: "
"rerun with LIBGUESTFS_DEBUG=1");
goto error;
}
for (size_t i = 0; i < mds.gl_pathc; i++) {
size_t len = strlen (mds.gl_pathv[i]) - strlen (PREFIX) - strlen (SUFFIX);
#define DEV "/dev/md"
char *dev = malloc (strlen(DEV) + len + 1);
if (NULL == dev) {
reply_with_perror("malloc");
goto error;
}
char *n = dev;
n = mempcpy(n, DEV, strlen(DEV));
n = mempcpy(n, &mds.gl_pathv[i][strlen(PREFIX)], len);
*n = '\0';
if (add_string_nodup (&r, &size, &alloc, dev) == -1) goto error;
}
if (add_string_nodup (&r, &size, &alloc, NULL) == -1) goto error;
globfree (&mds);
return r;
error:
globfree (&mds);
if (r != NULL) free_strings (r);
return NULL;
}
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