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lvm2/lib/locking/no_locking.c

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/*
* Copyright (C) 2001 Sistina Software (UK) Limited.
*
* This file is released under the LGPL.
*
*/
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#include "lib.h"
#include "locking.h"
#include "locking_types.h"
#include "lvm-string.h"
#include "activate.h"
#include "lvmcache.h"
#include <signal.h>
/*
* No locking
*/
static void _no_fin_locking(void)
{
return;
}
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static void _no_reset_locking(void)
{
return;
}
static int _no_lock_resource(struct cmd_context *cmd, const char *resource,
int flags)
{
switch (flags & LCK_SCOPE_MASK) {
case LCK_VG:
switch (flags & LCK_TYPE_MASK) {
case LCK_UNLOCK:
lvmcache_unlock_vgname(resource);
break;
default:
lvmcache_lock_vgname(resource,
(flags & LCK_TYPE_MASK) ==
LCK_READ);
}
break;
case LCK_LV:
switch (flags & LCK_TYPE_MASK) {
case LCK_UNLOCK:
return lv_resume_if_active(cmd, resource);
case LCK_READ:
return lv_activate(cmd, resource);
case LCK_WRITE:
return lv_suspend_if_active(cmd, resource);
case LCK_EXCL:
return lv_deactivate(cmd, resource);
default:
break;
}
break;
default:
log_error("Unrecognised lock scope: %d",
flags & LCK_SCOPE_MASK);
return 0;
}
return 1;
}
int init_no_locking(struct locking_type *locking, struct config_tree *cft)
{
locking->lock_resource = _no_lock_resource;
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locking->reset_locking = _no_reset_locking;
locking->fin_locking = _no_fin_locking;
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locking->flags = 0;
return 1;
}