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lvm2/lib/locking/no_locking.c

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/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
*
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* This file is part of LVM2.
*
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* 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.
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*
* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
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#include "lib.h"
#include "locking.h"
#include "locking_types.h"
#include "lvm-string.h"
#include "activate.h"
#include <signal.h>
/*
* No locking
*/
static void _no_fin_locking(void)
{
}
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static void _no_reset_locking(void)
{
}
static int _no_lock_resource(struct cmd_context *cmd, const char *resource,
uint32_t flags)
{
switch (flags & LCK_SCOPE_MASK) {
case LCK_VG:
if (!strcmp(resource, VG_SYNC_NAMES))
fs_unlock();
break;
case LCK_LV:
switch (flags & LCK_TYPE_MASK) {
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case LCK_NULL:
return lv_deactivate(cmd, resource);
case LCK_UNLOCK:
return lv_resume_if_active(cmd, resource, (flags & LCK_ORIGIN_ONLY) ? 1: 0, 0);
case LCK_READ:
return lv_activate_with_filter(cmd, resource, 0);
case LCK_WRITE:
return lv_suspend_if_active(cmd, resource, (flags & LCK_ORIGIN_ONLY) ? 1 : 0);
case LCK_EXCL:
return lv_activate_with_filter(cmd, resource, 1);
default:
break;
}
break;
default:
log_error("Unrecognised lock scope: %d",
flags & LCK_SCOPE_MASK);
return 0;
}
return 1;
}
static int _readonly_lock_resource(struct cmd_context *cmd,
const char *resource,
uint32_t flags)
{
if ((flags & LCK_TYPE_MASK) == LCK_WRITE &&
(flags & LCK_SCOPE_MASK) == LCK_VG &&
!(flags & LCK_CACHE) &&
strcmp(resource, VG_GLOBAL)) {
log_error("Write locks are prohibited with read-only locking.");
return 0;
}
return _no_lock_resource(cmd, resource, flags);
}
int init_no_locking(struct locking_type *locking, struct cmd_context *cmd __attribute__((unused)))
{
locking->lock_resource = _no_lock_resource;
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locking->reset_locking = _no_reset_locking;
locking->fin_locking = _no_fin_locking;
locking->flags = LCK_CLUSTERED;
return 1;
}
int init_readonly_locking(struct locking_type *locking, struct cmd_context *cmd __attribute__((unused)))
{
locking->lock_resource = _readonly_lock_resource;
locking->reset_locking = _no_reset_locking;
locking->fin_locking = _no_fin_locking;
locking->flags = 0;
return 1;
}