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When pvcreate/pvremove prompt the user, they first release the global lock, then acquire it again after the prompt, to avoid blocking other commands while waiting for a user response. This release/reacquire changes the locking order with respect to the hints flock (and potentially other locks). So, to avoid deadlock, use a nonblocking request when reacquiring the global lock.
83 lines
2.6 KiB
C
83 lines
2.6 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(struct cmd_context *cmd);
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void reset_locking(void);
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int vg_write_lock_held(void);
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/*
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* Lock/unlock on-disk volume group data.
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* Use VG_GLOBAL as a global lock.
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* char *vol holds volume group name.
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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).
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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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#define LCK_TYPE_MASK 0x00000007U
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#define LCK_READ 0x00000001U
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#define LCK_WRITE 0x00000004U
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#define LCK_UNLOCK 0x00000006U
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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_CONVERT 0x00000020U
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#define VG_ORPHANS "#orphans"
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#define VG_GLOBAL "#global"
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#define LCK_VG_READ LCK_READ
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#define LCK_VG_WRITE LCK_WRITE
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#define LCK_VG_UNLOCK LCK_UNLOCK
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#define unlock_vg(cmd, vg, vol) \
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do { \
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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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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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int lockf_global(struct cmd_context *cmd, const char *mode);
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int lockf_global_convert(struct cmd_context *cmd, const char *mode);
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int lockf_global_nonblock(struct cmd_context *cmd, const char *mode);
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int lock_global(struct cmd_context *cmd, const char *mode);
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int lock_global_convert(struct cmd_context *cmd, const char *mode);
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#endif
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