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If we know major:minor number of device (which is known after resume) we will try to use sysfs to set/get read ahead parameters of device. This avoid potential problem of blocking commands like 'dmsetup info' awaiting for device being usable for open/close - i.e. overfilled thin pool may block such command.
41 lines
1.5 KiB
C
41 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) 2004-2012 Red Hat, Inc. All rights reserved.
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*
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* This file is part of the device-mapper userspace tools.
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef LIB_DMCOMMON_H
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#define LIB_DMCOMMON_H
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#include "libdevmapper.h"
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struct target *create_target(uint64_t start,
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uint64_t len,
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const char *type, const char *params);
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int add_dev_node(const char *dev_name, uint32_t minor, uint32_t major,
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uid_t uid, gid_t gid, mode_t mode, int check_udev, unsigned rely_on_udev);
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int rm_dev_node(const char *dev_name, int check_udev, unsigned rely_on_udev);
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int rename_dev_node(const char *old_name, const char *new_name,
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int check_udev, unsigned rely_on_udev);
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int get_dev_node_read_ahead(const char *dev_name, uint32_t major, uint32_t minor,
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uint32_t *read_ahead);
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int set_dev_node_read_ahead(const char *dev_name, uint32_t major, uint32_t minor,
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uint32_t read_ahead, uint32_t read_ahead_flags);
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void update_devs(void);
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void selinux_release(void);
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void inc_suspended(void);
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void dec_suspended(void);
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#endif
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