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lvm2/lib/locking/locking.h
David Teigland 6ac1e04b3a replicator: remove the code 
It has not been used in a long time and is not
expected to be used further.
2017-10-13 16:20:42 -05:00

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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 "uuid.h"
#include "config.h"
struct logical_volume;
int init_locking(int type, struct cmd_context *cmd, int suppress_messages);
void fin_locking(void);
void reset_locking(void);
int vg_write_lock_held(void);
int locking_is_clustered(void);
int locking_supports_remote_queries(void);
#ifndef NODE_ALL
# define NODE_ALL "*"
# define NODE_LOCAL "."
# define NODE_REMOTE "^"
#endif
int cluster_lock_held(const char *vol, const char *node, int *exclusive);
/*
* LCK_VG:
* Lock/unlock on-disk volume group data.
* Use VG_ORPHANS to lock all orphan PVs.
* Use VG_GLOBAL as a global lock and to wipe the internal cache.
* char *vol holds volume group name.
* Set LCK_CACHE flag when manipulating 'vol' metadata in the internal cache.
* (Like commit, revert or invalidate metadata.)
* If more than one lock needs to be held simultaneously, they must be
* acquired in alphabetical order of 'vol' (to avoid deadlocks), with
* VG_ORPHANS last.
*
* Use VG_SYNC_NAMES to ensure /dev is up-to-date for example, with udev,
* by waiting for any asynchronous events issued to have completed.
*
* LCK_LV:
* Lock/unlock an individual logical volume
* char *vol holds lvid
*/
int lock_vol(struct cmd_context *cmd, const char *vol, uint32_t flags, const struct logical_volume *lv);
/*
* Internal locking representation.
* LCK_VG: Uses prefix V_ unless the vol begins with # (i.e. #global or #orphans)
* or the LCK_CACHE flag is set when it uses the prefix P_.
* If LCK_CACHE is set, we do not take out a real lock.
* NB In clustered situations, LCK_CACHE is not propagated directly to remote nodes.
* (It can be deduced from lock name.)
*/
/*
* Does the LVM1 driver have this VG active?
*/
int check_lvm1_vg_inactive(struct cmd_context *cmd, const char *vgname);
/*
* Lock type - these numbers are the same as VMS and the IBM DLM
*/
#define LCK_TYPE_MASK 0x00000007U
#define LCK_NULL 0x00000000U /* LCK$_NLMODE (Deactivate) */
#define LCK_READ 0x00000001U /* LCK$_CRMODE (Activate) */
/* LCK$_CWMODE */
#define LCK_PREAD 0x00000003U /* LCK$_PRMODE */
#define LCK_WRITE 0x00000004U /* LCK$_PWMODE (Suspend) */
#define LCK_EXCL 0x00000005U /* LCK$_EXMODE (Exclusive) */
#define LCK_UNLOCK 0x00000006U /* This is ours (Resume) */
/*
* Lock flags - these numbers are the same as DLM
*/
#define LCKF_NOQUEUE 0x00000001U /* LKF$_NOQUEUE */
#define LCKF_CONVERT 0x00000004U /* LKF$_CONVERT */
/*
* Lock scope
*/
#define LCK_SCOPE_MASK 0x00001008U
#define LCK_VG 0x00000000U /* Volume Group */
#define LCK_LV 0x00000008U /* Logical Volume */
#define LCK_ACTIVATION 0x00001000U /* Activation */
/*
* 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_HOLD 0x00000020U /* Hold lock when lock_vol returns? */
#define LCK_CLUSTER_VG 0x00000080U /* VG is clustered */
#define LCK_LOCAL 0x00000040U /* Don't propagate to other nodes */
#define LCK_REMOTE 0x00000800U /* Propagate to remote nodes only */
#define LCK_CACHE 0x00000100U /* Operation on cache only using P_ lock */
#define LCK_ORIGIN_ONLY 0x00000200U /* Operation should bypass any snapshots */
#define LCK_REVERT 0x00000400U /* Revert any incomplete change */
/*
* Additional lock bits for cluster communication via args[1]
*/
#define LCK_PARTIAL_MODE 0x01 /* Partial activation? */
#define LCK_MIRROR_NOSYNC_MODE 0x02 /* Mirrors don't require sync */
#define LCK_DMEVENTD_MONITOR_MODE 0x04 /* Register with dmeventd */
/* Not yet used. */
#define LCK_CONVERT_MODE 0x08 /* Convert existing lock */
#define LCK_TEST_MODE 0x10 /* Test mode: No activation */
#define LCK_ORIGIN_ONLY_MODE 0x20 /* Same as above */
#define LCK_DMEVENTD_MONITOR_IGNORE 0x40 /* Whether to ignore dmeventd */
#define LCK_REVERT_MODE 0x80 /* Remove inactive tables */
/*
* Special cases of VG locks.
*/
#define VG_ORPHANS "#orphans"
#define VG_GLOBAL "#global"
#define VG_SYNC_NAMES "#sync_names"
/*
* Common combinations
*/
#define LCK_NONE (LCK_VG | LCK_NULL)
#define LCK_ACTIVATE_LOCK (LCK_ACTIVATION | LCK_WRITE | LCK_HOLD)
#define LCK_ACTIVATE_UNLOCK (LCK_ACTIVATION | LCK_UNLOCK)
#define LCK_VG_READ (LCK_VG | LCK_READ | LCK_HOLD)
#define LCK_VG_WRITE (LCK_VG | LCK_WRITE | LCK_HOLD)
#define LCK_VG_UNLOCK (LCK_VG | LCK_UNLOCK)
#define LCK_VG_DROP_CACHE (LCK_VG | LCK_WRITE | LCK_CACHE)
/* FIXME: LCK_HOLD abused here */
#define LCK_VG_COMMIT (LCK_VG | LCK_WRITE | LCK_CACHE | LCK_HOLD)
#define LCK_VG_REVERT (LCK_VG | LCK_READ | LCK_CACHE | LCK_HOLD)
#define LCK_VG_BACKUP (LCK_VG | LCK_CACHE)
#define LCK_VG_SYNC (LCK_NONE | LCK_CACHE)
#define LCK_VG_SYNC_LOCAL (LCK_NONE | LCK_CACHE | LCK_LOCAL)
#define LCK_LV_EXCLUSIVE (LCK_LV | LCK_EXCL)
#define LCK_LV_SUSPEND (LCK_LV | LCK_WRITE)
#define LCK_LV_RESUME (LCK_LV | LCK_UNLOCK)
#define LCK_LV_ACTIVATE (LCK_LV | LCK_READ)
#define LCK_LV_DEACTIVATE (LCK_LV | LCK_NULL)
#define LCK_MASK (LCK_TYPE_MASK | LCK_SCOPE_MASK)
#define LCK_LV_CLUSTERED(lv) \
(vg_is_clustered((lv)->vg) ? LCK_CLUSTER_VG : 0)
#define lock_lv_vol(cmd, lv, flags) lock_vol(cmd, (lv)->lvid.s, flags | LCK_LV_CLUSTERED(lv), lv)
/*
* Activation locks are wrapped around activation commands that have to
* be processed atomically one-at-a-time.
* If a VG WRITE lock is held or clustered activation activates simple LV
* an activation lock is redundant.
*
* Some LV types do require taking a lock common for whole group of LVs.
* TODO: For simplicity reasons ATM take a VG activation global lock and
* later more fine-grained component detection algorithm can be added
*/
#define lv_type_requires_activation_lock(lv) ((lv_is_thin_type(lv) || lv_is_cache_type(lv) || lv_is_mirror_type(lv) || lv_is_raid_type(lv) || lv_is_origin(lv) || lv_is_snapshot(lv)) ? 1 : 0)
#define lv_activation_lock_name(lv) (lv_type_requires_activation_lock(lv) ? (lv)->vg->name : (lv)->lvid.s)
#define lv_requires_activation_lock_now(lv) ((!vg_write_lock_held() && (!vg_is_clustered((lv)->vg) || !lv_type_requires_activation_lock(lv))) ? 1 : 0)
#define lock_activation(cmd, lv) (lv_requires_activation_lock_now(lv) ? lock_vol(cmd, lv_activation_lock_name(lv), LCK_ACTIVATE_LOCK, lv) : 1)
#define unlock_activation(cmd, lv) (lv_requires_activation_lock_now(lv) ? lock_vol(cmd, lv_activation_lock_name(lv), LCK_ACTIVATE_UNLOCK, lv) : 1)
/*
* Place temporary exclusive 'activation' lock around an LV locking operation
* to serialise it.
*/
#define lock_lv_vol_serially(cmd, lv, flags) \
({ \
int rr = 0; \
\
if (lock_activation((cmd), (lv))) { \
rr = lock_lv_vol((cmd), (lv), (flags)); \
unlock_activation((cmd), (lv)); \
} \
rr; \
})
#define unlock_vg(cmd, vg, vol) \
do { \
if (vg && !lvmetad_vg_update_finish(vg)) \
stack; \
if (is_real_vg(vol) && !sync_dev_names(cmd)) \
stack; \
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)
#define resume_lv(cmd, lv) \
({ \
int rr = lock_lv_vol((cmd), (lv), LCK_LV_RESUME); \
unlock_activation((cmd), (lv)); \
rr; \
})
#define resume_lv_origin(cmd, lv) lock_lv_vol(cmd, lv, LCK_LV_RESUME | LCK_ORIGIN_ONLY)
#define revert_lv(cmd, lv) \
({ \
int rr = lock_lv_vol((cmd), (lv), LCK_LV_RESUME | LCK_REVERT); \
\
unlock_activation((cmd), (lv)); \
rr; \
})
#define suspend_lv(cmd, lv) \
(lock_activation((cmd), (lv)) ? lock_lv_vol((cmd), (lv), LCK_LV_SUSPEND | LCK_HOLD) : 0)
#define suspend_lv_origin(cmd, lv) lock_lv_vol(cmd, lv, LCK_LV_SUSPEND | LCK_HOLD | LCK_ORIGIN_ONLY)
#define deactivate_lv(cmd, lv) lock_lv_vol_serially(cmd, lv, LCK_LV_DEACTIVATE)
#define activate_lv(cmd, lv) lock_lv_vol_serially(cmd, lv, LCK_LV_ACTIVATE | LCK_HOLD)
#define activate_lv_excl_local(cmd, lv) \
lock_lv_vol_serially(cmd, lv, LCK_LV_EXCLUSIVE | LCK_HOLD | LCK_LOCAL)
#define activate_lv_excl_remote(cmd, lv) \
lock_lv_vol(cmd, lv, LCK_LV_EXCLUSIVE | LCK_HOLD | LCK_REMOTE)
struct logical_volume;
int activate_lv_excl(struct cmd_context *cmd, struct logical_volume *lv);
#define activate_lv_local(cmd, lv) \
lock_lv_vol_serially(cmd, lv, LCK_LV_ACTIVATE | LCK_HOLD | LCK_LOCAL)
#define deactivate_lv_local(cmd, lv) \
lock_lv_vol_serially(cmd, lv, LCK_LV_DEACTIVATE | LCK_LOCAL)
#define drop_cached_metadata(vg) \
lock_vol((vg)->cmd, (vg)->name, LCK_VG_DROP_CACHE, NULL)
#define remote_commit_cached_metadata(vg) \
lock_vol((vg)->cmd, (vg)->name, LCK_VG_COMMIT, NULL)
#define remote_revert_cached_metadata(vg) \
lock_vol((vg)->cmd, (vg)->name, LCK_VG_REVERT, NULL)
#define remote_backup_metadata(vg) \
lock_vol((vg)->cmd, (vg)->name, LCK_VG_BACKUP, NULL)
int sync_local_dev_names(struct cmd_context* cmd);
int sync_dev_names(struct cmd_context* cmd);
/* Process list of LVs */
struct volume_group;
int suspend_lvs(struct cmd_context *cmd, struct dm_list *lvs,
struct volume_group *vg_to_revert);
int resume_lvs(struct cmd_context *cmd, struct dm_list *lvs);
int revert_lvs(struct cmd_context *cmd, struct dm_list *lvs);
int activate_lvs(struct cmd_context *cmd, struct dm_list *lvs, unsigned exclusive);
#endif
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