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608eedf88d
Add --config for overriding most config file settings from cmdline. Quote arguments when printing command line. Remove linefeed from 'initialising logging' message. Add 'Completed' debug message. Don't attempt library exit after reloading config files. Always compile with libdevmapper, even if device-mapper is disabled.
96 lines
2.4 KiB
C
96 lines
2.4 KiB
C
/*
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* Copyright (C) 2002-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License v.2.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "lib.h"
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#include "locking_types.h"
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#include "defaults.h"
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#include "sharedlib.h"
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#include "toolcontext.h"
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static void *_locking_lib = NULL;
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static void (*_reset_fn) (void) = NULL;
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static void (*_end_fn) (void) = NULL;
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static int (*_lock_fn) (struct cmd_context * cmd, const char *resource,
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int flags) = NULL;
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static int (*_init_fn) (int type, struct config_tree * cft,
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uint32_t *flags) = NULL;
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static int _lock_resource(struct cmd_context *cmd, const char *resource,
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int flags)
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{
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if (_lock_fn)
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return _lock_fn(cmd, resource, flags);
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else
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return 0;
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}
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static void _fin_external_locking(void)
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{
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if (_end_fn)
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_end_fn();
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dlclose(_locking_lib);
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_locking_lib = NULL;
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_init_fn = NULL;
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_end_fn = NULL;
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_lock_fn = NULL;
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_reset_fn = NULL;
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}
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static void _reset_external_locking(void)
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{
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if (_reset_fn)
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_reset_fn();
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}
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int init_external_locking(struct locking_type *locking, struct cmd_context *cmd)
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{
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const char *libname;
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if (_locking_lib) {
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log_error("External locking already initialised");
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return 1;
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}
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locking->lock_resource = _lock_resource;
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locking->fin_locking = _fin_external_locking;
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locking->reset_locking = _reset_external_locking;
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locking->flags = 0;
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libname = find_config_tree_str(cmd, "global/locking_library",
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DEFAULT_LOCKING_LIB);
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if (!(_locking_lib = load_shared_library(cmd, libname, "locking", 1))) {
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stack;
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return 0;
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}
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/* Get the functions we need */
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if (!(_init_fn = dlsym(_locking_lib, "locking_init")) ||
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!(_lock_fn = dlsym(_locking_lib, "lock_resource")) ||
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!(_reset_fn = dlsym(_locking_lib, "reset_locking")) ||
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!(_end_fn = dlsym(_locking_lib, "locking_end"))) {
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log_error("Shared library %s does not contain locking "
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"functions", libname);
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dlclose(_locking_lib);
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_locking_lib = NULL;
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return 0;
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}
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log_verbose("Loaded external locking library %s", libname);
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return _init_fn(2, cmd->cft, &locking->flags);
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}
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