mirror of
git://sourceware.org/git/lvm2.git
synced 2024-12-21 13:34:40 +03:00
84cdf85bd2
Let's enforce cheking of write access to LV by compiler. Activation part does never need to write anything to LV so keep LV pointer const.
127 lines
3.6 KiB
C
127 lines
3.6 KiB
C
/*
|
|
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
|
|
* Copyright (C) 2004-2007 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 "locking.h"
|
|
#include "locking_types.h"
|
|
#include "lvm-string.h"
|
|
#include "activate.h"
|
|
|
|
#include <signal.h>
|
|
|
|
/*
|
|
* No locking
|
|
*/
|
|
|
|
static void _no_fin_locking(void)
|
|
{
|
|
}
|
|
|
|
static void _no_reset_locking(void)
|
|
{
|
|
}
|
|
|
|
static int _no_lock_resource(struct cmd_context *cmd, const char *resource,
|
|
uint32_t flags, const struct logical_volume *lv)
|
|
{
|
|
switch (flags & LCK_SCOPE_MASK) {
|
|
case LCK_ACTIVATION:
|
|
break;
|
|
case LCK_VG:
|
|
if (!strcmp(resource, VG_SYNC_NAMES))
|
|
fs_unlock();
|
|
break;
|
|
case LCK_LV:
|
|
switch (flags & LCK_TYPE_MASK) {
|
|
case LCK_NULL:
|
|
return lv_deactivate(cmd, resource, lv_ondisk(lv));
|
|
case LCK_UNLOCK:
|
|
return lv_resume_if_active(cmd, resource, (flags & LCK_ORIGIN_ONLY) ? 1: 0, 0, (flags & LCK_REVERT) ? 1 : 0, lv_ondisk(lv));
|
|
case LCK_READ:
|
|
return lv_activate_with_filter(cmd, resource, 0, lv->status & LV_NOSCAN ? 1 : 0,
|
|
lv->status & LV_TEMPORARY ? 1 : 0, lv_ondisk(lv));
|
|
case LCK_WRITE:
|
|
return lv_suspend_if_active(cmd, resource, (flags & LCK_ORIGIN_ONLY) ? 1 : 0, 0, lv_ondisk(lv), lv);
|
|
case LCK_EXCL:
|
|
return lv_activate_with_filter(cmd, resource, 1, lv->status & LV_NOSCAN ? 1 : 0,
|
|
lv->status & LV_TEMPORARY ? 1 : 0, lv_ondisk(lv));
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
log_error("Unrecognised lock scope: %d",
|
|
flags & LCK_SCOPE_MASK);
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int _no_query_resource(const char *resource, int *mode)
|
|
{
|
|
log_very_verbose("Locking is disabled: Treating lock %s as not held.",
|
|
resource);
|
|
return 1;
|
|
}
|
|
|
|
static int _readonly_lock_resource(struct cmd_context *cmd,
|
|
const char *resource,
|
|
uint32_t flags, const struct logical_volume *lv)
|
|
{
|
|
if ((flags & LCK_TYPE_MASK) == LCK_WRITE &&
|
|
(flags & LCK_SCOPE_MASK) == LCK_VG &&
|
|
!(flags & LCK_CACHE) &&
|
|
strcmp(resource, VG_GLOBAL)) {
|
|
log_error("Read-only locking type set. "
|
|
"Write locks are prohibited.");
|
|
return 0;
|
|
}
|
|
|
|
return _no_lock_resource(cmd, resource, flags, lv);
|
|
}
|
|
|
|
void init_no_locking(struct locking_type *locking, struct cmd_context *cmd __attribute__((unused)),
|
|
int suppress_messages)
|
|
{
|
|
locking->lock_resource = _no_lock_resource;
|
|
locking->query_resource = _no_query_resource;
|
|
locking->reset_locking = _no_reset_locking;
|
|
locking->fin_locking = _no_fin_locking;
|
|
locking->flags = LCK_CLUSTERED;
|
|
}
|
|
|
|
int init_readonly_locking(struct locking_type *locking, struct cmd_context *cmd __attribute__((unused)),
|
|
int suppress_messages)
|
|
{
|
|
locking->lock_resource = _readonly_lock_resource;
|
|
locking->query_resource = _no_query_resource;
|
|
locking->reset_locking = _no_reset_locking;
|
|
locking->fin_locking = _no_fin_locking;
|
|
locking->flags = 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
void init_dummy_locking(struct locking_type *locking, struct cmd_context *cmd __attribute__((unused)),
|
|
int suppress_messages)
|
|
{
|
|
locking->lock_resource = _readonly_lock_resource;
|
|
locking->query_resource = _no_query_resource;
|
|
locking->reset_locking = _no_reset_locking;
|
|
locking->fin_locking = _no_fin_locking;
|
|
locking->flags = LCK_CLUSTERED;
|
|
}
|