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/* libguestfs - the guestfsd daemon
* Copyright (C) 2009 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 <stdint.h>
#include <inttypes.h>
#include <unistd.h>
#include "daemon.h"
#include "actions.h"
/* These functions are all about using the blockdev command, so
* we centralize it in one call.
*/
static int64_t
call_blockdev (const char *device, const char *switc, int extraarg, int prints)
{
int r;
int64_t rv;
char *out, *err;
const char *argv[] = {
"blockdev",
switc,
NULL,
NULL,
NULL
};
char buf[64];
/* When you call close on any block device, udev kicks off a rule
* which runs blkid to reexamine the device. We need to wait for
* this rule to finish running (from a previous operation) since it
* holds the device open and can cause other operations to fail,
* notably BLKRRPART.
*
* This is particularly a problem where we have just written to a
* device (eg. zeroing it) and immediately call blockdev --rereadpt.
*
* Therefore, wait for udev to finish all outstanding events before
* performing any blockdev command.
*/
udev_settle ();
if (extraarg > 0) {
snprintf (buf, sizeof buf, "%d", extraarg);
argv[2] = buf;
argv[3] = device;
} else
argv[2] = device;
r = commandv (&out, &err, argv);
if (r == -1) {
reply_with_error ("%s: %s", argv[0], err);
free (err);
free (out);
return -1;
}
rv = 0;
if (prints) {
if (sscanf (out, "%" SCNi64, &rv) != 1) {
reply_with_error ("%s: expected output, but got nothing", argv[0]);
free (out);
free (err);
return -1;
}
}
free (out);
free (err);
return rv;
}
int
do_blockdev_setro (const char *device)
{
return (int) call_blockdev (device, "--setro", 0, 0);
}
int
do_blockdev_setrw (const char *device)
{
return (int) call_blockdev (device, "--setrw", 0, 0);
}
int
do_blockdev_getro (const char *device)
{
return (int) call_blockdev (device, "--getro", 0, 1);
}
int
do_blockdev_getss (const char *device)
{
return (int) call_blockdev (device, "--getss", 0, 1);
}
int
do_blockdev_getbsz (const char *device)
{
return (int) call_blockdev (device, "--getbsz", 0, 1);
}
int
do_blockdev_setbsz (const char *device, int blocksize)
{
if (blocksize <= 0 /* || blocksize >= what? */) {
reply_with_error ("blocksize must be > 0");
return -1;
}
return (int) call_blockdev (device, "--setbsz", blocksize, 0);
}
int64_t
do_blockdev_getsz (const char *device)
{
return call_blockdev (device, "--getsz", 0, 1);
}
int64_t
do_blockdev_getsize64 (const char *device)
{
return call_blockdev (device, "--getsize64", 0, 1);
}
int
do_blockdev_flushbufs (const char *device)
{
return call_blockdev (device, "--flushbufs", 0, 0);
}
int
do_blockdev_rereadpt (const char *device)
{
return call_blockdev (device, "--rereadpt", 0, 0);
}
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