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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 <unistd.h>
#include <limits.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <fcntl.h>
#include "ignore-value.h"
#include "daemon.h"
#include "actions.h"
#define BUS_PATH "/sys/bus/virtio/drivers/9pnet_virtio"
static void
modprobe_9pnet_virtio (void)
{
/* Required with Linux 5.6 and maybe earlier kernels. For unclear
* reasons the module is not an automatic dependency of the 9p
* module so doesn't get loaded automatically.
*/
ignore_value (command (NULL, NULL, "modprobe", "9pnet_virtio", NULL));
}
/* https://bugzilla.redhat.com/show_bug.cgi?id=714981#c1 */
char **
do_list_9p (void)
{
CLEANUP_FREE_STRINGSBUF DECLARE_STRINGSBUF (r);
DIR *dir;
modprobe_9pnet_virtio ();
dir = opendir (BUS_PATH);
if (!dir) {
perror ("opendir: " BUS_PATH);
if (errno != ENOENT) {
reply_with_perror ("opendir: " BUS_PATH);
return NULL;
}
/* If this directory doesn't exist, it probably means that
* the virtio driver isn't loaded. Don't return an error
* in this case, but return an empty list.
*/
if (end_stringsbuf (&r) == -1)
return NULL;
return take_stringsbuf (&r);
}
while (1) {
struct dirent *d;
errno = 0;
d = readdir (dir);
if (d == NULL) break;
if (STRPREFIX (d->d_name, "virtio")) {
CLEANUP_FREE char *mount_tag_path = NULL;
if (asprintf (&mount_tag_path, BUS_PATH "/%s/mount_tag",
d->d_name) == -1) {
reply_with_perror ("asprintf");
closedir (dir);
return NULL;
}
/* A bit unclear, but it looks like the virtio transport allows
* the mount tag length to be unlimited (or up to 65536 bytes).
* See: linux/include/linux/virtio_9p.h
*/
CLEANUP_FREE char *mount_tag = read_whole_file (mount_tag_path, NULL);
if (mount_tag == 0)
continue;
if (add_string (&r, mount_tag) == -1) {
closedir (dir);
return NULL;
}
}
}
/* Check readdir didn't fail */
if (errno != 0) {
reply_with_perror ("readdir: /sys/block");
closedir (dir);
return NULL;
}
/* Close the directory handle */
if (closedir (dir) == -1) {
reply_with_perror ("closedir: /sys/block");
return NULL;
}
/* Sort the tags. */
if (r.size > 0)
sort_strings (r.argv, r.size);
/* NULL terminate the list */
if (end_stringsbuf (&r) == -1)
return NULL;
return take_stringsbuf (&r);
}
/* Takes optional arguments, consult optargs_bitmask. */
int
do_mount_9p (const char *mount_tag, const char *mountpoint, const char *options)
{
CLEANUP_FREE char *mp = NULL, *opts = NULL, *err = NULL;
struct stat statbuf;
int r;
ABS_PATH (mountpoint, 0, return -1);
mp = sysroot_path (mountpoint);
if (!mp) {
reply_with_perror ("malloc");
return -1;
}
/* Check the mountpoint exists and is a directory. */
if (stat (mp, &statbuf) == -1) {
reply_with_perror ("%s", mountpoint);
return -1;
}
if (!S_ISDIR (statbuf.st_mode)) {
reply_with_perror ("%s: mount point is not a directory", mountpoint);
return -1;
}
/* Add trans=virtio to the options. */
if ((optargs_bitmask & GUESTFS_MOUNT_9P_OPTIONS_BITMASK) &&
STRNEQ (options, "")) {
if (asprintf (&opts, "trans=virtio,%s", options) == -1) {
reply_with_perror ("asprintf");
return -1;
}
}
else {
opts = strdup ("trans=virtio");
if (opts == NULL) {
reply_with_perror ("strdup");
return -1;
}
}
modprobe_9pnet_virtio ();
r = command (NULL, &err,
"mount", "-o", opts, "-t", "9p", mount_tag, mp, NULL);
if (r == -1) {
reply_with_error ("%s on %s: %s", mount_tag, mountpoint, err);
return -1;
}
return 0;
}
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