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/*
* Copyright (C) 2010 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "lib.h"
#include "log.h"
#include "lvm2cmd.h"
#include "dmeventd_lvm.h"
#include <pthread.h>
#include <syslog.h>
extern int dmeventd_debug;
/*
* register_device() is called first and performs initialisation.
* Only one device may be registered or unregistered at a time.
*/
static pthread_mutex_t _register_mutex = PTHREAD_MUTEX_INITIALIZER;
/*
* Number of active registrations.
*/
static int _register_count = 0;
static struct dm_pool *_mem_pool = NULL;
static void *_lvm_handle = NULL;
/*
* Currently only one event can be processed at a time.
*/
static pthread_mutex_t _event_mutex = PTHREAD_MUTEX_INITIALIZER;
/*
* FIXME Do not pass things directly to syslog, rather use the existing logging
* facilities to sort logging ... however that mechanism needs to be somehow
* configurable and we don't have that option yet
*/
static void _temporary_log_fn(int level,
const char *file __attribute__((unused)),
int line __attribute__((unused)),
int dm_errno __attribute__((unused)),
const char *message)
{
level &= ~(_LOG_STDERR | _LOG_ONCE);
switch (level) {
case _LOG_DEBUG:
if (dmeventd_debug >= 3)
syslog(LOG_DEBUG, "%s", message);
break;
case _LOG_INFO:
if (dmeventd_debug >= 2)
syslog(LOG_INFO, "%s", message);
break;
case _LOG_NOTICE:
if (dmeventd_debug >= 1)
syslog(LOG_NOTICE, "%s", message);
break;
case _LOG_WARN:
syslog(LOG_WARNING, "%s", message);
break;
case _LOG_ERR:
syslog(LOG_ERR, "%s", message);
break;
default:
syslog(LOG_CRIT, "%s", message);
}
}
void dmeventd_lvm2_lock(void)
{
pthread_mutex_lock(&_event_mutex);
}
void dmeventd_lvm2_unlock(void)
{
pthread_mutex_unlock(&_event_mutex);
}
int dmeventd_lvm2_init(void)
{
int r = 0;
pthread_mutex_lock(&_register_mutex);
/*
* Need some space for allocations. 1024 should be more
* than enough for what we need (device mapper name splitting)
*/
if (!_mem_pool && !(_mem_pool = dm_pool_create("mirror_dso", 1024)))
goto out;
if (!_lvm_handle) {
lvm2_log_fn(_temporary_log_fn);
if (!(_lvm_handle = lvm2_init())) {
dm_pool_destroy(_mem_pool);
_mem_pool = NULL;
goto out;
}
lvm2_disable_dmeventd_monitoring(_lvm_handle);
/* FIXME Temporary: move to dmeventd core */
lvm2_run(_lvm_handle, "_memlock_inc");
}
_register_count++;
r = 1;
out:
pthread_mutex_unlock(&_register_mutex);
return r;
}
void dmeventd_lvm2_exit(void)
{
pthread_mutex_lock(&_register_mutex);
if (!--_register_count) {
lvm2_run(_lvm_handle, "_memlock_dec");
dm_pool_destroy(_mem_pool);
_mem_pool = NULL;
lvm2_exit(_lvm_handle);
_lvm_handle = NULL;
}
pthread_mutex_unlock(&_register_mutex);
}
struct dm_pool *dmeventd_lvm2_pool(void)
{
return _mem_pool;
}
int dmeventd_lvm2_run(const char *cmdline)
{
return lvm2_run(_lvm_handle, cmdline);
}
int dmeventd_lvm2_command(struct dm_pool *mem, char *buffer, size_t size,
const char *cmd, const char *device)
{
char *vg = NULL, *lv = NULL, *layer;
int r;
if (!dm_split_lvm_name(mem, device, &vg, &lv, &layer)) {
syslog(LOG_ERR, "Unable to determine VG name from %s.\n",
device);
return 0;
}
/* strip off the mirror component designations */
layer = strstr(lv, "_mlog");
if (layer)
*layer = '\0';
r = dm_snprintf(buffer, size, "%s %s/%s", cmd, vg, lv);
dm_pool_free(mem, vg);
if (r < 0) {
syslog(LOG_ERR, "Unable to form LVM command. (too long).\n");
return 0;
}
return 1;
}
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