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mirror of git://sourceware.org/git/lvm2.git synced 2024-12-22 17:35:59 +03:00
lvm2/lib/locking/locking.h
Alasdair Kergon f4cbeaf0ac o Lock mechanism for LV activation
o #defines for common lock flag combinations
o Try out hyphens instead of colons in device-mapper names - does this
  make messages containing filenames easier to read?
2002-02-27 12:26:41 +00:00

66 lines
1.4 KiB
C

/*
* Copyright (C) 2001 Sistina Software (UK) Limited.
*
* This file is released under the LGPL.
*
*/
#include "metadata.h"
#include "uuid.h"
#include "config.h"
int init_locking(int type, struct config_file *cf);
void fin_locking(void);
/*
* LCK_VG:
* Lock/unlock on-disk volume group data
* Use "" to lock orphan PVs
* char *vol holds volume group name
*
* LCK_LV:
* Lock/unlock an individual logical volume
* If it's active, LCK_WRITE suspends it; LCK_EXCLUSIVE deactivates it;
* LCK_NONE unsuspends it.
* LCK_READ activates it.
* char *vol holds "VG_name/LV_uuid"
*
* FIXME: Change to something like
* int lock_vol(struct cmd_context *cmd, const struct id *id, int flags);
*/
int lock_vol(struct cmd_context *cmd, const char *vol, int flags);
/*
* Lock type
*/
#define LCK_TYPE_MASK 0x000000FF
#define LCK_NONE 0x00000000
#define LCK_READ 0x00000001
#define LCK_WRITE 0x00000002
#define LCK_EXCL 0x00000003
/*
* Lock scope
*/
#define LCK_SCOPE_MASK 0x0000FF00
#define LCK_VG 0x00000000
#define LCK_LV 0x00000100
/*
* Lock bits
*/
#define LCK_NONBLOCK 0x00010000
/*
* Common combinations
*/
#define LCK_VG_READ (LCK_VG | LCK_READ)
#define LCK_VG_WRITE (LCK_VG | LCK_WRITE)
#define LCK_VG_UNLOCK (LCK_VG | LCK_NONE)
#define LCK_LV_DEACTIVATE (LCK_LV | LCK_EXCL)
#define LCK_LV_SUSPEND (LCK_LV | LCK_WRITE)
#define LCK_LV_ACTIVATE (LCK_LV | LCK_READ)
#define LCK_LV_UNLOCK (LCK_LV | LCK_NONE)