2 * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
3 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
5 * This file is part of LVM2.
7 * This copyrighted material is made available to anyone wishing to use,
8 * modify, copy, or redistribute it subject to the terms and conditions
9 * of the GNU Lesser General Public License v.2.1.
11 * You should have received a copy of the GNU Lesser General Public License
12 * along with this program; if not, write to the Free Software Foundation,
13 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
16 #ifndef _LVM_LOCKING_H
17 #define _LVM_LOCKING_H
22 int init_locking(int type, struct cmd_context *cmd, int suppress_messages);
23 void fin_locking(void);
24 void reset_locking(void);
25 int vg_write_lock_held(void);
26 int locking_is_clustered(void);
28 int remote_lock_held(const char *vol);
32 * Lock/unlock on-disk volume group data.
33 * Use VG_ORPHANS to lock all orphan PVs.
34 * Use VG_GLOBAL as a global lock and to wipe the internal cache.
35 * char *vol holds volume group name.
36 * Set LCK_CACHE flag when manipulating 'vol' metadata in the internal cache.
37 * (Like commit, revert or invalidate metadata.)
38 * If more than one lock needs to be held simultaneously, they must be
39 * acquired in alphabetical order of 'vol' (to avoid deadlocks), with
43 * Lock/unlock an individual logical volume
44 * char *vol holds lvid
46 int lock_vol(struct cmd_context *cmd, const char *vol, uint32_t flags);
49 * Internal locking representation.
50 * LCK_VG: Uses prefix V_ unless the vol begins with # (i.e. #global or #orphans)
51 * or the LCK_CACHE flag is set when it uses the prefix P_.
52 * If LCK_CACHE is set, we do not take out a real lock.
53 * NB In clustered situations, LCK_CACHE is not propagated directly to remote nodes.
54 * (It can be deduced from lock name.)
58 * Does the LVM1 driver have this VG active?
60 int check_lvm1_vg_inactive(struct cmd_context *cmd, const char *vgname);
63 * Lock type - these numbers are the same as VMS and the IBM DLM
65 #define LCK_TYPE_MASK 0x00000007U
67 #define LCK_NULL 0x00000000U /* LCK$_NLMODE */
68 #define LCK_READ 0x00000001U /* LCK$_CRMODE */
70 #define LCK_PREAD 0x00000003U /* LCK$_PRMODE */
71 #define LCK_WRITE 0x00000004U /* LCK$_PWMODE */
72 #define LCK_EXCL 0x00000005U /* LCK$_EXMODE */
73 #define LCK_UNLOCK 0x00000006U /* This is ours */
76 * Lock flags - these numbers are the same as DLM
78 #define LCKF_NOQUEUE 0x00000001U /* LKF$_NOQUEUE */
79 #define LCKF_CONVERT 0x00000004U /* LKF$_CONVERT */
84 #define LCK_SCOPE_MASK 0x00000008U
85 #define LCK_VG 0x00000000U
86 #define LCK_LV 0x00000008U
91 #define LCK_NONBLOCK 0x00000010U /* Don't block waiting for lock? */
92 #define LCK_HOLD 0x00000020U /* Hold lock when lock_vol returns? */
93 #define LCK_LOCAL 0x00000040U /* Don't propagate to other nodes */
94 #define LCK_CLUSTER_VG 0x00000080U /* VG is clustered */
95 #define LCK_CACHE 0x00000100U /* Operation on cache only using P_ lock */
96 #define LCK_ORIGIN_ONLY 0x00000200U /* Operation should bypass any snapshots */
99 * Additional lock bits for cluster communication via args[1]
101 #define LCK_PARTIAL_MODE 0x01 /* Partial activation? */
102 #define LCK_MIRROR_NOSYNC_MODE 0x02 /* Mirrors don't require sync */
103 #define LCK_DMEVENTD_MONITOR_MODE 0x04 /* Register with dmeventd */
104 #define LCK_CONVERT 0x08 /* Convert existing lock */
105 #define LCK_ORIGIN_ONLY_MODE 0x20 /* Same as above */
108 * Special cases of VG locks.
110 #define VG_ORPHANS "#orphans"
111 #define VG_GLOBAL "#global"
114 * Common combinations
116 #define LCK_NONE (LCK_VG | LCK_NULL)
118 #define LCK_VG_READ (LCK_VG | LCK_READ | LCK_HOLD)
119 #define LCK_VG_WRITE (LCK_VG | LCK_WRITE | LCK_HOLD)
120 #define LCK_VG_UNLOCK (LCK_VG | LCK_UNLOCK)
121 #define LCK_VG_DROP_CACHE (LCK_VG | LCK_WRITE | LCK_CACHE)
123 /* FIXME: LCK_HOLD abused here */
124 #define LCK_VG_COMMIT (LCK_VG | LCK_WRITE | LCK_CACHE | LCK_HOLD)
125 #define LCK_VG_REVERT (LCK_VG | LCK_READ | LCK_CACHE | LCK_HOLD)
127 #define LCK_VG_BACKUP (LCK_VG | LCK_CACHE)
129 #define LCK_LV_EXCLUSIVE (LCK_LV | LCK_EXCL)
130 #define LCK_LV_SUSPEND (LCK_LV | LCK_WRITE)
131 #define LCK_LV_RESUME (LCK_LV | LCK_UNLOCK)
132 #define LCK_LV_ACTIVATE (LCK_LV | LCK_READ)
133 #define LCK_LV_DEACTIVATE (LCK_LV | LCK_NULL)
135 #define LCK_MASK (LCK_TYPE_MASK | LCK_SCOPE_MASK)
137 #define LCK_LV_CLUSTERED(lv) \
138 (vg_is_clustered((lv)->vg) ? LCK_CLUSTER_VG : 0)
140 #define lock_lv_vol(cmd, lv, flags) \
141 (find_replicator_vgs((lv)) ? \
142 lock_vol(cmd, (lv)->lvid.s, flags | LCK_LV_CLUSTERED(lv)) : \
145 #define unlock_vg(cmd, vol) lock_vol(cmd, vol, LCK_VG_UNLOCK)
146 #define unlock_and_free_vg(cmd, vg, vol) \
148 unlock_vg(cmd, vol); \
152 #define resume_lv(cmd, lv) lock_lv_vol(cmd, lv, LCK_LV_RESUME)
153 #define resume_lv_origin(cmd, lv) lock_lv_vol(cmd, lv, LCK_LV_RESUME | LCK_ORIGIN_ONLY)
154 #define suspend_lv(cmd, lv) lock_lv_vol(cmd, lv, LCK_LV_SUSPEND | LCK_HOLD)
155 #define suspend_lv_origin(cmd, lv) lock_lv_vol(cmd, lv, LCK_LV_SUSPEND | LCK_HOLD | LCK_ORIGIN_ONLY)
156 #define deactivate_lv(cmd, lv) lock_lv_vol(cmd, lv, LCK_LV_DEACTIVATE)
157 #define activate_lv(cmd, lv) lock_lv_vol(cmd, lv, LCK_LV_ACTIVATE | LCK_HOLD)
158 #define activate_lv_excl(cmd, lv) \
159 lock_lv_vol(cmd, lv, LCK_LV_EXCLUSIVE | LCK_HOLD)
160 #define activate_lv_local(cmd, lv) \
161 lock_lv_vol(cmd, lv, LCK_LV_ACTIVATE | LCK_HOLD | LCK_LOCAL)
162 #define deactivate_lv_local(cmd, lv) \
163 lock_lv_vol(cmd, lv, LCK_LV_DEACTIVATE | LCK_LOCAL)
164 #define drop_cached_metadata(vg) \
165 lock_vol((vg)->cmd, (vg)->name, LCK_VG_DROP_CACHE)
166 #define remote_commit_cached_metadata(vg) \
167 lock_vol((vg)->cmd, (vg)->name, LCK_VG_COMMIT)
168 #define remote_revert_cached_metadata(vg) \
169 lock_vol((vg)->cmd, (vg)->name, LCK_VG_REVERT)
170 #define remote_backup_metadata(vg) \
171 lock_vol((vg)->cmd, (vg)->name, LCK_VG_BACKUP)
173 /* Process list of LVs */
174 int suspend_lvs(struct cmd_context *cmd, struct dm_list *lvs);
175 int resume_lvs(struct cmd_context *cmd, struct dm_list *lvs);
176 int activate_lvs(struct cmd_context *cmd, struct dm_list *lvs, unsigned exclusive);
178 /* Interrupt handling */
179 void sigint_clear(void);
180 void sigint_allow(void);
181 void sigint_restore(void);
182 int sigint_caught(void);