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6365f011b0
Introduce prioritized_section() as a closer match to previous logic of critical_section() that has been held over longer sequence of ioctl commands - essentially it's matching operation on a single cookie. While 'critical_section()' now corresponds to locked memory - we hold this memory only between suspend/resume thus notion of 'cookie' was lost. This patch restores some logic unintentionaly lost with dropping memory locking for just activation/deactivation calls.
46 lines
1.5 KiB
C
46 lines
1.5 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_MEMLOCK_H
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#define LVM_MEMLOCK_H
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struct cmd_context;
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/*
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* Inside a critical section, memory is always locked.
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*
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* After leaving the critical section, memory stays locked until
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* memlock_unlock() is called. This happens with
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* sync_local_dev_names() and sync_dev_names().
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*
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* This allows critical sections to be entered and exited repeatedly without
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* incurring the expense of locking memory every time.
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*
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* memlock_reset() is necessary to clear the state after forking (polldaemon).
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*/
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void critical_section_inc(struct cmd_context *cmd, const char *reason);
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void critical_section_dec(struct cmd_context *cmd, const char *reason);
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int critical_section(void);
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int prioritized_section(void);
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void memlock_inc_daemon(struct cmd_context *cmd);
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void memlock_dec_daemon(struct cmd_context *cmd);
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int memlock_count_daemon(void);
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void memlock_init(struct cmd_context *cmd);
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void memlock_reset(void);
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void memlock_unlock(struct cmd_context *cmd);
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#endif
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