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/*
* Common code for checking sessions for mnt use
*
* Copyright (C) 2014 - 2015 Chris Leech
* Copyright (C) 2014 - 2015 Red Hat, Inc. All rights reserved.
*
* 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.
*
* See the file COPYING included with this distribution for more details.
*/
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <dirent.h>
#include <libmount/libmount.h>
#include "initiator.h"
#include "transport.h"
#include "iscsid.h"
#include "iscsi_ipc.h"
#include "log.h"
#include "iscsi_sysfs.h"
#include "iscsi_settings.h"
#include "iface.h"
#include "host.h"
#include "sysdeps.h"
#include "iscsi_err.h"
#include "iscsi_net_util.h"
static struct libmnt_table *mtab, *swaps;
static struct libmnt_cache *mntcache;
static void libmount_cleanup(void)
{
mnt_free_table(mtab);
mnt_free_table(swaps);
mnt_free_cache(mntcache);
mtab = NULL;
swaps = NULL;
mntcache = NULL;
}
static int libmount_init(void)
{
mnt_init_debug(0);
mtab = mnt_new_table();
swaps = mnt_new_table();
mntcache = mnt_new_cache();
if (!mtab || !swaps || !mntcache) {
libmount_cleanup();
return -ENOMEM;
}
mnt_table_set_cache(mtab, mntcache);
mnt_table_set_cache(swaps, mntcache);
mnt_table_parse_mtab(mtab, NULL);
mnt_table_parse_swaps(swaps, NULL);
return 0;
}
static int trans_filter(const struct dirent *d)
{
if (!strcmp(".", d->d_name) || !strcmp("..", d->d_name))
return 0;
return 1;
}
static int subdir_filter(const struct dirent *d)
{
if (!(d->d_type & DT_DIR))
return 0;
return trans_filter(d);
}
static int is_partition(const char *path)
{
char *devtype;
int rc = 0;
devtype = sysfs_get_uevent_devtype(path);
if (!devtype)
return 0;
if (strcmp(devtype, "partition") == 0)
rc = 1;
free(devtype);
return rc;
}
static int blockdev_check_mnts(char *syspath)
{
struct libmnt_fs *fs;
char *devname = NULL;
char *_devname = NULL;
int rc = 0;
devname = sysfs_get_uevent_devname(syspath);
if (!devname)
goto out;
_devname = calloc(1, PATH_MAX);
if (!_devname)
goto out;
snprintf(_devname, PATH_MAX, "/dev/%s", devname);
fs = mnt_table_find_source(mtab, _devname, MNT_ITER_FORWARD);
if (fs) {
rc = 1;
goto out;
}
fs = mnt_table_find_source(swaps, _devname, MNT_ITER_FORWARD);
if (fs)
rc = 1;
out:
free(devname);
free(_devname);
return rc;
}
static int count_device_users(char *syspath);
static int blockdev_get_partitions(char *syspath)
{
struct dirent **parts = NULL;
int n, i;
int count = 0;
n = scandir(syspath, &parts, subdir_filter, alphasort);
for (i = 0; i < n; i++) {
char *newpath;
newpath = calloc(1, PATH_MAX);
if (!newpath)
continue;
snprintf(newpath, PATH_MAX, "%s/%s", syspath, parts[i]->d_name);
free(parts[i]);
if (is_partition(newpath)) {
count += count_device_users(newpath);
}
free(newpath);
}
free(parts);
return count;
}
static int blockdev_get_holders(char *syspath)
{
char *path = NULL;
struct dirent **holds = NULL;
int n, i;
int count = 0;
path = calloc(1, PATH_MAX);
if (!path)
return 0;
snprintf(path, PATH_MAX, "%s/holders", syspath);
n = scandir(path, &holds, trans_filter, alphasort);
for (i = 0; i < n; i++) {
char *newpath;
char *rp;
newpath = calloc(1, PATH_MAX);
if (!newpath)
continue;
snprintf(newpath, PATH_MAX, "%s/%s", path, holds[i]->d_name);
free(holds[i]);
rp = realpath(newpath, NULL);
if (rp)
count += count_device_users(rp);
free(newpath);
free(rp);
}
free(path);
free(holds);
return count;
}
static int count_device_users(char *syspath)
{
int count = 0;
count += blockdev_check_mnts(syspath);
count += blockdev_get_partitions(syspath);
count += blockdev_get_holders(syspath);
return count;
};
static void device_in_use(void *data, int host_no, int target, int lun)
{
char *syspath = NULL;
char *devname = NULL;
int *count = data;
devname = iscsi_sysfs_get_blockdev_from_lun(host_no, target, lun);
if (!devname)
goto out;
syspath = calloc(1, PATH_MAX);
if (!syspath)
goto out;
snprintf(syspath, PATH_MAX, "/sys/class/block/%s", devname);
*count += count_device_users(syspath);
out:
free(syspath);
free(devname);
}
int session_in_use(int sid)
{
int host_no = -1, err = 0;
int count = 0;
if (libmount_init()) {
log_error("Failed to initialize libmount, "
"not checking for active mounts on session [%d].", sid);
return 0;
}
host_no = iscsi_sysfs_get_host_no_from_sid(sid, &err);
if (!err)
iscsi_sysfs_for_each_device(&count, host_no, sid, device_in_use);
libmount_cleanup();
return count;
}
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