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/* virt-df
* Copyright (C) 2010-2012 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 <stdint.h>
#include <string.h>
#include <inttypes.h>
#ifdef HAVE_LIBVIRT
#include <libvirt/libvirt.h>
#include <libvirt/virterror.h>
#endif
#include "progname.h"
#include "c-ctype.h"
#include "guestfs.h"
#include "options.h"
#include "virt-df.h"
static void try_df (const char *name, const char *uuid, const char *dev, int offset);
static int find_dev_in_devices (const char *dev, char **devices);
/* Since we want this function to be robust against very bad failure
* cases (hello, https://bugzilla.kernel.org/show_bug.cgi?id=18792) it
* won't exit on guestfs failures.
*/
int
df_on_handle (const char *name, const char *uuid, char **devices, int offset)
{
int ret = -1;
size_t i;
char **fses = NULL;
int free_devices = 0, is_lv;
if (verbose) {
fprintf (stderr, "df_on_handle %s devices=", name);
if (devices) {
fputc ('[', stderr);
for (i = 0; devices[i] != NULL; ++i) {
if (i > 0)
fputc (' ', stderr);
fputs (devices[i], stderr);
}
fputc (']', stderr);
}
else
fprintf (stderr, "null");
fputc ('\n', stderr);
}
if (devices == NULL) {
devices = guestfs_list_devices (g);
if (devices == NULL)
goto cleanup;
free_devices = 1;
} else {
/* Mask LVM for just the devices in the set. */
if (guestfs_lvm_set_filter (g, devices) == -1)
goto cleanup;
}
/* list-filesystems will return filesystems on every device ... */
fses = guestfs_list_filesystems (g);
if (fses == NULL)
goto cleanup;
/* ... so we need to filter out only the devices we are interested in. */
for (i = 0; fses[i] != NULL; i += 2) {
if (STRNEQ (fses[i+1], "") &&
STRNEQ (fses[i+1], "swap") &&
STRNEQ (fses[i+1], "unknown")) {
is_lv = guestfs_is_lv (g, fses[i]);
if (is_lv > 0) /* LVs are OK because of the LVM filter */
try_df (name, uuid, fses[i], -1);
else if (is_lv == 0) {
if (find_dev_in_devices (fses[i], devices))
try_df (name, uuid, fses[i], offset);
}
}
}
ret = 0;
cleanup:
if (fses) {
for (i = 0; fses[i] != NULL; ++i)
free (fses[i]);
free (fses);
}
if (free_devices) {
for (i = 0; devices[i] != NULL; ++i)
free (devices[i]);
free (devices);
}
return ret;
}
/* dev is a device or partition name such as "/dev/sda" or "/dev/sda1".
* See if dev occurs somewhere in the list of devices.
*/
static int
find_dev_in_devices (const char *dev, char **devices)
{
guestfs_error_handler_cb old_error_cb;
void *old_error_data;
size_t i, len;
char *whole_disk;
int free_whole_disk;
int ret = 0;
/* Convert 'dev' to a whole disk name. */
len = strlen (dev);
if (len > 0 && c_isdigit (dev[len-1])) {
old_error_cb = guestfs_get_error_handler (g, &old_error_data);
guestfs_set_error_handler (g, NULL, NULL);
whole_disk = guestfs_part_to_dev (g, dev);
guestfs_set_error_handler (g, old_error_cb, old_error_data);
if (!whole_disk) /* probably an MD device or similar */
return 0;
free_whole_disk = 1;
}
else {
whole_disk = (char *) dev;
free_whole_disk = 0;
}
for (i = 0; devices[i] != NULL; ++i) {
if (STREQ (whole_disk, devices[i])) {
ret = 1;
break;
}
}
if (free_whole_disk)
free (whole_disk);
return ret;
}
static void
try_df (const char *name, const char *uuid,
const char *dev, int offset)
{
struct guestfs_statvfs *stat = NULL;
guestfs_error_handler_cb old_error_cb;
void *old_error_data;
if (verbose)
fprintf (stderr, "try_df %s %s %d\n", name, dev, offset);
/* Try mounting and stating the device. This might reasonably fail,
* so don't show errors.
*/
old_error_cb = guestfs_get_error_handler (g, &old_error_data);
guestfs_set_error_handler (g, NULL, NULL);
if (guestfs_mount_ro (g, dev, "/") == 0) {
stat = guestfs_statvfs (g, "/");
guestfs_umount_all (g);
}
guestfs_set_error_handler (g, old_error_cb, old_error_data);
if (stat) {
print_stat (name, uuid, dev, offset, stat);
guestfs_free_statvfs (stat);
}
}
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