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98 lines
2.5 KiB
C
98 lines
2.5 KiB
C
/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2014 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "lib/misc/lib.h"
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#include "lib/locking/locking.h"
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#include "locking_types.h"
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#include "lib/config/config.h"
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#include "lib/config/defaults.h"
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#include "lib/misc/lvm-string.h"
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#include "lib/misc/lvm-flock.h"
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#include <limits.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <signal.h>
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static char _lock_dir[PATH_MAX];
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static void _fin_file_locking(void)
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{
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release_flocks(1);
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}
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static void _reset_file_locking(void)
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{
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release_flocks(0);
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}
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static int _file_lock_resource(struct cmd_context *cmd, const char *resource,
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uint32_t flags, const struct logical_volume *lv)
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{
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char lockfile[PATH_MAX];
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if (!strcmp(resource, VG_GLOBAL)) {
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if (dm_snprintf(lockfile, sizeof(lockfile),
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"%s/P_%s", _lock_dir, resource + 1) < 0) {
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log_error("Too long locking filename %s/P_%s.", _lock_dir, resource + 1);
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return 0;
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}
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} else
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if (dm_snprintf(lockfile, sizeof(lockfile), "%s/V_%s", _lock_dir, resource) < 0) {
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log_error("Too long locking filename %s/V_%s.", _lock_dir, resource);
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return 0;
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}
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if (!lock_file(lockfile, flags))
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return_0;
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return 1;
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}
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int init_file_locking(struct locking_type *locking, struct cmd_context *cmd,
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int suppress_messages)
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{
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int r;
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const char *locking_dir;
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init_flock(cmd);
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locking->lock_resource = _file_lock_resource;
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locking->reset_locking = _reset_file_locking;
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locking->fin_locking = _fin_file_locking;
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locking->flags = LCK_FLOCK;
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/* Get lockfile directory from config file */
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locking_dir = find_config_tree_str(cmd, global_locking_dir_CFG, NULL);
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if (!_dm_strncpy(_lock_dir, locking_dir, sizeof(_lock_dir))) {
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log_error("Path for locking_dir %s is invalid.", locking_dir);
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return 0;
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}
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(void) dm_prepare_selinux_context(_lock_dir, S_IFDIR);
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r = dm_create_dir(_lock_dir);
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(void) dm_prepare_selinux_context(NULL, 0);
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if (!r)
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return 0;
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/* Trap a read-only file system */
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if ((access(_lock_dir, R_OK | W_OK | X_OK) == -1) && (errno == EROFS))
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return 0;
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return 1;
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}
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