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bb45e33518
Previously there have been necessary explicit call of backup (often either forgotten or over-used). With this patch the necessity to store backup is remember at vg_commit and once the VG is unlocked, the committed metadata are automatically store in backup file. This may possibly alter some printed messages from command when the backup is now taken later.
86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2011 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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#ifndef _LVM_LOCKING_H
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#define _LVM_LOCKING_H
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#include "lib/uuid/uuid.h"
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#include "lib/config/config.h"
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struct logical_volume;
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int init_locking(struct cmd_context *cmd, int file_locking_sysinit, int file_locking_readonly, int file_locking_ignorefail);
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void fin_locking(struct cmd_context *cmd);
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void reset_locking(void);
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int vg_write_lock_held(void);
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/*
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* Lock/unlock on-disk volume group data.
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* Use VG_GLOBAL as a global lock.
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* char *vol holds volume group name.
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* If more than one lock needs to be held simultaneously, they must be
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* acquired in alphabetical order of 'vol' (to avoid deadlocks).
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*/
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int lock_vol(struct cmd_context *cmd, const char *vol, uint32_t flags, const struct logical_volume *lv);
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#define LCK_TYPE_MASK 0x00000007U
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#define LCK_READ 0x00000001U
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#define LCK_WRITE 0x00000004U
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#define LCK_UNLOCK 0x00000006U
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/*
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* Lock bits.
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* Bottom 8 bits except LCK_LOCAL form args[0] in cluster comms.
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*/
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#define LCK_NONBLOCK 0x00000010U /* Don't block waiting for lock? */
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#define LCK_CONVERT 0x00000020U
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#define VG_ORPHANS "#orphans"
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#define VG_GLOBAL "#global"
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#define LCK_VG_READ LCK_READ
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#define LCK_VG_WRITE LCK_WRITE
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#define LCK_VG_UNLOCK LCK_UNLOCK
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#define unlock_vg(cmd, vg, vol) \
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do { \
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if (is_real_vg(vol)) { \
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if (!sync_local_dev_names(cmd)) \
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stack; \
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vg_backup_if_needed(vg); \
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} \
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if (!lock_vol(cmd, vol, LCK_VG_UNLOCK, NULL)) \
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stack; \
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} while (0)
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#define unlock_and_release_vg(cmd, vg, vol) \
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do { \
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unlock_vg(cmd, vg, vol); \
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release_vg(vg); \
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} while (0)
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int sync_local_dev_names(struct cmd_context* cmd);
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/* Process list of LVs */
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struct volume_group;
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int activate_lvs(struct cmd_context *cmd, struct dm_list *lvs, unsigned exclusive);
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int lockf_global(struct cmd_context *cmd, const char *mode);
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int lockf_global_convert(struct cmd_context *cmd, const char *mode);
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int lockf_global_nonblock(struct cmd_context *cmd, const char *mode);
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int lock_global(struct cmd_context *cmd, const char *mode);
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int lock_global_convert(struct cmd_context *cmd, const char *mode);
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#endif
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