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/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2011 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _LVM_LOCKING_H
#define _LVM_LOCKING_H
#include "lib/uuid/uuid.h"
#include "lib/config/config.h"
struct logical_volume;
int init_locking(struct cmd_context *cmd, int file_locking_sysinit, int file_locking_readonly, int file_locking_ignorefail);
void fin_locking(struct cmd_context *cmd);
void reset_locking(void);
int vg_write_lock_held(void);
/*
* Lock/unlock on-disk volume group data.
* Use VG_GLOBAL as a global lock.
* char *vol holds volume group name.
* If more than one lock needs to be held simultaneously, they must be
* acquired in alphabetical order of 'vol' (to avoid deadlocks).
*/
int lock_vol(struct cmd_context *cmd, const char *vol, uint32_t flags, const struct logical_volume *lv);
#define LCK_TYPE_MASK 0x00000007U
#define LCK_READ 0x00000001U
#define LCK_WRITE 0x00000004U
#define LCK_UNLOCK 0x00000006U
/*
* Lock bits.
* Bottom 8 bits except LCK_LOCAL form args[0] in cluster comms.
*/
#define LCK_NONBLOCK 0x00000010U /* Don't block waiting for lock? */
#define LCK_CONVERT 0x00000020U
#define VG_ORPHANS "#orphans"
#define VG_GLOBAL "#global"
#define LCK_VG_READ LCK_READ
#define LCK_VG_WRITE LCK_WRITE
#define LCK_VG_UNLOCK LCK_UNLOCK
#define unlock_vg(cmd, vg, vol) \
do { \
if (is_real_vg(vol)) { \
if (!sync_local_dev_names(cmd)) \
stack; \
vg_backup_if_needed(vg); \
} \
if (!lock_vol(cmd, vol, LCK_VG_UNLOCK, NULL)) \
stack; \
} while (0)
#define unlock_and_release_vg(cmd, vg, vol) \
do { \
unlock_vg(cmd, vg, vol); \
release_vg(vg); \
} while (0)
int sync_local_dev_names(struct cmd_context* cmd);
/* Process list of LVs */
struct volume_group;
int activate_lvs(struct cmd_context *cmd, struct dm_list *lvs, unsigned exclusive);
int lockf_global(struct cmd_context *cmd, const char *mode);
int lockf_global_convert(struct cmd_context *cmd, const char *mode);
int lockf_global_nonblock(struct cmd_context *cmd, const char *mode);
int lock_global(struct cmd_context *cmd, const char *mode);
int lock_global_convert(struct cmd_context *cmd, const char *mode);
#endif
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