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108 lines
3.0 KiB
C
108 lines
3.0 KiB
C
/*
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* Copyright (C) 2002-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2006 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 Lesser General Public License v.2.1.
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*
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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,
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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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#include "activate.h"
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#include "locking.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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uint32_t flags) = NULL;
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static int (*_init_fn) (int type, struct dm_config_tree * cft,
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uint32_t *flags) = NULL;
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static int (*_lock_query_fn) (const char *resource, int *mode) = NULL;
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static int _lock_resource(struct cmd_context *cmd, const char *resource,
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uint32_t flags, struct logical_volume *lv __attribute__((unused)))
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{
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if (!_lock_fn)
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return 0;
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if (!strcmp(resource, VG_SYNC_NAMES)) {
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/* Hide this lock request from external locking */
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fs_unlock();
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return 1;
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}
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return _lock_fn(cmd, resource, flags);
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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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int suppress_messages)
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{
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const char *libname;
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if (_locking_lib) {
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log_error_suppress(suppress_messages, "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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if (!(libname = find_config_tree_str(cmd, global_locking_library_CFG, NULL)))
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libname = DEFAULT_LOCKING_LIB;
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if (!(_locking_lib = load_shared_library(cmd, libname, "locking", 1)))
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return_0;
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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_suppress(suppress_messages, "Shared library %s does "
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"not contain locking 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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if (!(_lock_query_fn = dlsym(_locking_lib, "query_resource")))
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log_warn_suppress(suppress_messages, "WARNING: %s: _query_resource() "
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"missing: Using inferior activation method.", libname);
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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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