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/*
Copyright (c) 2013-2014 Red Hat, Inc. <http://www.redhat.com>
This file is part of GlusterFS.
This file is licensed to you under your choice of the GNU Lesser
General Public License, version 3 or any later version (LGPLv3 or
later), or the GNU General Public License, version 2 (GPLv2), in all
cases as published by the Free Software Foundation.
*/
#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif
#include "common-utils.h"
#include "cli1-xdr.h"
#include "xdr-generic.h"
#include "glusterd.h"
#include "glusterd-op-sm.h"
#include "glusterd-store.h"
#include "glusterd-utils.h"
#include "glusterd-volgen.h"
#include "glusterd-locks.h"
#include "run.h"
#include "syscall.h"
#include <signal.h>
static dict_t *vol_lock;
/* Initialize the global vol-lock list(dict) when
* glusterd is spawned */
int32_t
glusterd_vol_lock_init ()
{
int32_t ret = -1;
vol_lock = dict_new ();
if (!vol_lock)
goto out;
ret = 0;
out:
return ret;
}
/* Destroy the global vol-lock list(dict) when
* glusterd cleanup is performed */
void
glusterd_vol_lock_fini ()
{
if (vol_lock)
dict_unref (vol_lock);
}
int32_t
glusterd_get_vol_lock_owner (char *volname, uuid_t *uuid)
{
int32_t ret = -1;
vol_lock_obj *lock_obj = NULL;
uuid_t no_owner = {0,};
if (!volname || !uuid) {
gf_log ("", GF_LOG_ERROR, "volname or uuid is null.");
ret = -1;
goto out;
}
ret = dict_get_bin (vol_lock, volname, (void **) &lock_obj);
if (!ret)
uuid_copy (*uuid, lock_obj->lock_owner);
else
uuid_copy (*uuid, no_owner);
ret = 0;
out:
gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
return ret;
}
int32_t
glusterd_volume_lock (char *volname, uuid_t uuid)
{
int32_t ret = -1;
vol_lock_obj *lock_obj = NULL;
uuid_t owner = {0};
if (!volname) {
gf_log ("", GF_LOG_ERROR, "volname is null.");
ret = -1;
goto out;
}
ret = glusterd_get_vol_lock_owner (volname, &owner);
if (ret) {
gf_log ("", GF_LOG_DEBUG, "Unable to get volume lock owner");
goto out;
}
/* If the lock has already been held for the given volume
* we fail */
if (!uuid_is_null (owner)) {
gf_log ("", GF_LOG_ERROR, "Unable to acquire lock. "
"Lock for %s held by %s", volname,
uuid_utoa (owner));
ret = -1;
goto out;
}
lock_obj = GF_CALLOC (1, sizeof(vol_lock_obj),
gf_common_mt_vol_lock_obj_t);
if (!lock_obj) {
ret = -1;
goto out;
}
uuid_copy (lock_obj->lock_owner, uuid);
ret = dict_set_bin (vol_lock, volname, lock_obj, sizeof(vol_lock_obj));
if (ret) {
gf_log ("", GF_LOG_ERROR, "Unable to set lock owner "
"in volume lock");
if (lock_obj)
GF_FREE (lock_obj);
goto out;
}
gf_log ("", GF_LOG_DEBUG, "Lock for %s successfully held by %s",
volname, uuid_utoa (uuid));
ret = 0;
out:
gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
return ret;
}
int32_t
glusterd_volume_unlock (char *volname, uuid_t uuid)
{
int32_t ret = -1;
uuid_t owner = {0};
if (!volname) {
gf_log ("", GF_LOG_ERROR, "volname is null.");
ret = -1;
goto out;
}
ret = glusterd_get_vol_lock_owner (volname, &owner);
if (ret)
goto out;
if (uuid_is_null (owner)) {
gf_log ("", GF_LOG_ERROR, "Lock for %s not held", volname);
ret = -1;
goto out;
}
ret = uuid_compare (uuid, owner);
if (ret) {
gf_log (THIS->name, GF_LOG_ERROR, "Lock owner mismatch. "
"Lock for %s held by %s",
volname, uuid_utoa (owner));
goto out;
}
/* Removing the volume lock from the global list */
dict_del (vol_lock, volname);
gf_log ("", GF_LOG_DEBUG, "Lock for %s successfully released",
volname);
ret = 0;
out:
gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
return ret;
}
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