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176 lines
5.7 KiB
C
176 lines
5.7 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(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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int locking_supports_remote_queries(void);
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#ifndef NODE_ALL
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# define NODE_ALL "*"
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# define NODE_LOCAL "."
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# define NODE_REMOTE "^"
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#endif
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int cluster_lock_held(const char *vol, const char *node, int *exclusive);
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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 LCK_CACHE flag when manipulating 'vol' metadata in the internal cache.
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* (Like commit, revert or invalidate metadata.)
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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), with
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* VG_ORPHANS last.
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*
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* Use VG_SYNC_NAMES to ensure /dev is up-to-date for example, with udev,
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* by waiting for any asynchronous events issued to have completed.
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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, const struct logical_volume *lv);
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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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* NB In clustered situations, LCK_CACHE is not propagated directly to remote nodes.
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* (It can be deduced from lock name.)
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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$_NLMODE (Deactivate) */
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#define LCK_READ 0x00000001U /* LCK$_CRMODE (Activate) */
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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$_PWMODE (Suspend) */
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#define LCK_EXCL 0x00000005U /* LCK$_EXMODE (Exclusive) */
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#define LCK_UNLOCK 0x00000006U /* This is ours (Resume) */
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/*
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* Lock flags - these numbers are the same as DLM
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*/
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#define LCKF_NOQUEUE 0x00000001U /* LKF$_NOQUEUE */
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#define LCKF_CONVERT 0x00000004U /* LKF$_CONVERT */
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/*
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* Lock scope
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*/
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#define LCK_SCOPE_MASK 0x00001008U
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#define LCK_VG 0x00000000U /* Volume Group */
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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_HOLD 0x00000020U /* Hold lock when lock_vol returns? */
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#define LCK_CLUSTER_VG 0x00000080U /* VG is clustered */
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#define LCK_LOCAL 0x00000040U /* Don't propagate to other nodes */
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#define LCK_REMOTE 0x00000800U /* Propagate to remote nodes only */
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#define LCK_CACHE 0x00000100U /* Operation on cache only using P_ lock */
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#define LCK_ORIGIN_ONLY 0x00000200U /* Operation should bypass any snapshots */
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#define LCK_REVERT 0x00000400U /* Revert any incomplete change */
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/*
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* Additional lock bits for cluster communication via args[1]
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*/
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#define LCK_PARTIAL_MODE 0x01 /* Partial activation? */
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#define LCK_MIRROR_NOSYNC_MODE 0x02 /* Mirrors don't require sync */
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#define LCK_DMEVENTD_MONITOR_MODE 0x04 /* Register with dmeventd */
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/* Not yet used. */
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#define LCK_CONVERT_MODE 0x08 /* Convert existing lock */
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#define LCK_TEST_MODE 0x10 /* Test mode: No activation */
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#define LCK_ORIGIN_ONLY_MODE 0x20 /* Same as above */
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#define LCK_DMEVENTD_MONITOR_IGNORE 0x40 /* Whether to ignore dmeventd */
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#define LCK_REVERT_MODE 0x80 /* Remove inactive tables */
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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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/* FIXME: LCK_HOLD abused here */
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#define LCK_VG_COMMIT (LCK_VG | LCK_WRITE | LCK_CACHE | LCK_HOLD)
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#define LCK_VG_REVERT (LCK_VG | LCK_READ | LCK_CACHE | LCK_HOLD)
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#define LCK_VG_BACKUP (LCK_VG | LCK_CACHE)
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#define LCK_MASK (LCK_TYPE_MASK | LCK_SCOPE_MASK)
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#define unlock_vg(cmd, vg, vol) \
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do { \
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if (vg && !lvmetad_vg_update_finish(vg)) \
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stack; \
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if (is_real_vg(vol) && !sync_local_dev_names(cmd)) \
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stack; \
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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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#define drop_cached_metadata(vg) \
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lock_vol((vg)->cmd, (vg)->name, LCK_VG_DROP_CACHE, NULL)
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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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#endif
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