mirror of
git://sourceware.org/git/lvm2.git
synced 2024-12-21 13:34:40 +03:00
e59e2f7c3c
leaving behind the LVM-specific parts of the code (convenience wrappers that handle `struct device` and `struct cmd_context`, basically). A number of functions have been renamed (in addition to getting a dm_ prefix) -- namely, all of the config interface now has a dm_config_ prefix.
108 lines
3.0 KiB
C
108 lines
3.0 KiB
C
/*
|
|
* Copyright (C) 2002-2004 Sistina Software, Inc. All rights reserved.
|
|
* Copyright (C) 2004-2006 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_types.h"
|
|
#include "defaults.h"
|
|
#include "sharedlib.h"
|
|
#include "toolcontext.h"
|
|
#include "activate.h"
|
|
#include "locking.h"
|
|
|
|
static void *_locking_lib = NULL;
|
|
static void (*_reset_fn) (void) = NULL;
|
|
static void (*_end_fn) (void) = NULL;
|
|
static int (*_lock_fn) (struct cmd_context * cmd, const char *resource,
|
|
uint32_t flags) = NULL;
|
|
static int (*_init_fn) (int type, struct dm_config_tree * cft,
|
|
uint32_t *flags) = NULL;
|
|
static int (*_lock_query_fn) (const char *resource, int *mode) = NULL;
|
|
|
|
static int _lock_resource(struct cmd_context *cmd, const char *resource,
|
|
uint32_t flags)
|
|
{
|
|
if (!_lock_fn)
|
|
return 0;
|
|
|
|
if (!strcmp(resource, VG_SYNC_NAMES)) {
|
|
/* Hide this lock request from external locking */
|
|
fs_unlock();
|
|
return 1;
|
|
}
|
|
|
|
return _lock_fn(cmd, resource, flags);
|
|
}
|
|
|
|
static void _fin_external_locking(void)
|
|
{
|
|
if (_end_fn)
|
|
_end_fn();
|
|
|
|
dlclose(_locking_lib);
|
|
|
|
_locking_lib = NULL;
|
|
_init_fn = NULL;
|
|
_end_fn = NULL;
|
|
_lock_fn = NULL;
|
|
_reset_fn = NULL;
|
|
}
|
|
|
|
static void _reset_external_locking(void)
|
|
{
|
|
if (_reset_fn)
|
|
_reset_fn();
|
|
}
|
|
|
|
int init_external_locking(struct locking_type *locking, struct cmd_context *cmd,
|
|
int suppress_messages)
|
|
{
|
|
const char *libname;
|
|
|
|
if (_locking_lib) {
|
|
log_error_suppress(suppress_messages, "External locking already initialised");
|
|
return 1;
|
|
}
|
|
|
|
locking->lock_resource = _lock_resource;
|
|
locking->fin_locking = _fin_external_locking;
|
|
locking->reset_locking = _reset_external_locking;
|
|
locking->flags = 0;
|
|
|
|
libname = find_config_tree_str(cmd, "global/locking_library",
|
|
DEFAULT_LOCKING_LIB);
|
|
|
|
if (!(_locking_lib = load_shared_library(cmd, libname, "locking", 1)))
|
|
return_0;
|
|
|
|
/* Get the functions we need */
|
|
if (!(_init_fn = dlsym(_locking_lib, "locking_init")) ||
|
|
!(_lock_fn = dlsym(_locking_lib, "lock_resource")) ||
|
|
!(_reset_fn = dlsym(_locking_lib, "reset_locking")) ||
|
|
!(_end_fn = dlsym(_locking_lib, "locking_end"))) {
|
|
log_error_suppress(suppress_messages, "Shared library %s does "
|
|
"not contain locking functions", libname);
|
|
dlclose(_locking_lib);
|
|
_locking_lib = NULL;
|
|
return 0;
|
|
}
|
|
|
|
if (!(_lock_query_fn = dlsym(_locking_lib, "query_resource")))
|
|
log_warn_suppress(suppress_messages, "WARNING: %s: _query_resource() "
|
|
"missing: Using inferior activation method.", libname);
|
|
|
|
log_verbose("Loaded external locking library %s", libname);
|
|
return _init_fn(2, cmd->cft, &locking->flags);
|
|
}
|