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git://sourceware.org/git/lvm2.git
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dfbc015c69
Run backup of metadata on remote nodes in the same place like local node - when calling backup(). Introduce backup_locally() which calls only local backup if needed. Remote backup is now trigerred by LCK_VG_BACKUP flag combination (special VG lock). This lock type will call check_current_backup() (including backup_locally() call) and updates metadata on all nodes. (Patch fixes non-functional remote backup, current call during VG lock never triggers.)
150 lines
4.9 KiB
C
150 lines
4.9 KiB
C
/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2007 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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#ifndef _LVM_LOCKING_H
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#define _LVM_LOCKING_H
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#include "uuid.h"
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#include "config.h"
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int init_locking(int type, struct cmd_context *cmd);
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void fin_locking(void);
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void reset_locking(void);
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int vg_write_lock_held(void);
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int locking_is_clustered(void);
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/*
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* LCK_VG:
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* Lock/unlock on-disk volume group data.
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* Use VG_ORPHANS to lock all orphan PVs.
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* Use VG_GLOBAL as a global lock and to wipe the internal cache.
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* char *vol holds volume group name.
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* Set the LCK_CACHE flag to invalidate 'vol' in the internal cache.
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*
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* LCK_LV:
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* Lock/unlock an individual logical volume
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* char *vol holds lvid
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*/
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int lock_vol(struct cmd_context *cmd, const char *vol, uint32_t flags);
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/*
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* Internal locking representation.
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* LCK_VG: Uses prefix V_ unless the vol begins with # (i.e. #global or #orphans)
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* or the LCK_CACHE flag is set when it uses the prefix P_.
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* If LCK_CACHE is set, we do not take out a real lock.
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*/
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/*
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* Does the LVM1 driver have this VG active?
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*/
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int check_lvm1_vg_inactive(struct cmd_context *cmd, const char *vgname);
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/*
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* Lock type - these numbers are the same as VMS and the IBM DLM
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*/
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#define LCK_TYPE_MASK 0x00000007U
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#define LCK_NULL 0x00000000U /* LCK$_NLMODE */
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#define LCK_READ 0x00000001U /* LCK$_CRMODE */
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/* LCK$_CWMODE */
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#define LCK_PREAD 0x00000003U /* LCK$_PRMODE */
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#define LCK_WRITE 0x00000004U /* LCK$_PWMODE */
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#define LCK_EXCL 0x00000005U /* LCK$_EXMODE */
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#define LCK_UNLOCK 0x00000006U /* This is ours */
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/*
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* Lock scope
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*/
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#define LCK_SCOPE_MASK 0x00000008U
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#define LCK_VG 0x00000000U
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#define LCK_LV 0x00000008U
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/*
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* Lock bits
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*/
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#define LCK_NONBLOCK 0x00000010U /* Don't block waiting for lock? */
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#define LCK_HOLD 0x00000020U /* Hold lock when lock_vol returns? */
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#define LCK_LOCAL 0x00000040U /* Don't propagate to other nodes */
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#define LCK_CLUSTER_VG 0x00000080U /* VG is clustered */
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#define LCK_CACHE 0x00000100U /* Operation on cache only using P_ lock */
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/*
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* Additional lock bits for cluster communication
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*/
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#define LCK_MIRROR_NOSYNC_MODE 0x00000002U /* Mirrors don't require sync */
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#define LCK_DMEVENTD_MONITOR_MODE 0x00000004U /* Register with dmeventd */
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/*
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* Special cases of VG locks.
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*/
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#define VG_ORPHANS "#orphans"
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#define VG_GLOBAL "#global"
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/*
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* Common combinations
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*/
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#define LCK_NONE (LCK_VG | LCK_NULL)
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#define LCK_VG_READ (LCK_VG | LCK_READ | LCK_HOLD)
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#define LCK_VG_WRITE (LCK_VG | LCK_WRITE | LCK_HOLD)
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#define LCK_VG_UNLOCK (LCK_VG | LCK_UNLOCK)
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#define LCK_VG_DROP_CACHE (LCK_VG | LCK_WRITE | LCK_CACHE)
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#define LCK_VG_BACKUP (LCK_VG | LCK_CACHE)
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#define LCK_LV_EXCLUSIVE (LCK_LV | LCK_EXCL | LCK_NONBLOCK)
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#define LCK_LV_SUSPEND (LCK_LV | LCK_WRITE | LCK_NONBLOCK)
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#define LCK_LV_RESUME (LCK_LV | LCK_UNLOCK | LCK_NONBLOCK)
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#define LCK_LV_ACTIVATE (LCK_LV | LCK_READ | LCK_NONBLOCK)
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#define LCK_LV_DEACTIVATE (LCK_LV | LCK_NULL | LCK_NONBLOCK)
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#define LCK_LV_CLUSTERED(lv) \
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(vg_is_clustered((lv)->vg) ? LCK_CLUSTER_VG : 0)
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#define lock_lv_vol(cmd, lv, flags) \
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lock_vol(cmd, (lv)->lvid.s, flags | LCK_LV_CLUSTERED(lv))
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#define unlock_vg(cmd, vol) lock_vol(cmd, vol, LCK_VG_UNLOCK)
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#define unlock_release_vg(cmd, vg, vol) do { unlock_vg(cmd, vol); \
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vg_release(vg); \
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} while (0)
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#define resume_lv(cmd, lv) lock_lv_vol(cmd, lv, LCK_LV_RESUME)
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#define suspend_lv(cmd, lv) lock_lv_vol(cmd, lv, LCK_LV_SUSPEND | LCK_HOLD)
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#define deactivate_lv(cmd, lv) lock_lv_vol(cmd, lv, LCK_LV_DEACTIVATE)
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#define activate_lv(cmd, lv) lock_lv_vol(cmd, lv, LCK_LV_ACTIVATE | LCK_HOLD)
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#define activate_lv_excl(cmd, lv) \
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lock_lv_vol(cmd, lv, LCK_LV_EXCLUSIVE | LCK_HOLD)
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#define activate_lv_local(cmd, lv) \
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lock_lv_vol(cmd, lv, LCK_LV_ACTIVATE | LCK_HOLD | LCK_LOCAL)
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#define deactivate_lv_local(cmd, lv) \
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lock_lv_vol(cmd, lv, LCK_LV_DEACTIVATE | LCK_LOCAL)
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#define drop_cached_metadata(vg) \
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lock_vol((vg)->cmd, (vg)->name, LCK_VG_DROP_CACHE)
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#define remote_backup_metadata(vg) \
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lock_vol((vg)->cmd, (vg)->name, LCK_VG_BACKUP)
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/* Process list of LVs */
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int suspend_lvs(struct cmd_context *cmd, struct dm_list *lvs);
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int resume_lvs(struct cmd_context *cmd, struct dm_list *lvs);
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int activate_lvs(struct cmd_context *cmd, struct dm_list *lvs, unsigned exclusive);
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/* Interrupt handling */
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void sigint_clear(void);
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void sigint_allow(void);
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void sigint_restore(void);
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int sigint_caught(void);
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#endif
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