3ae1acf93a
New features: lock timeouts and time warnings. If the DLM_LKF_TIMEOUT flag is set, then the request/conversion will be canceled after waiting the specified number of centiseconds (specified per lock). This feature is only available for locks requested through libdlm (can be enabled for kernel dlm users if there's a use for it.) If the new DLM_LSFL_TIMEWARN flag is set when creating the lockspace, then a warning message will be sent to userspace (using genetlink) after a request/conversion has been waiting for a given number of centiseconds (configurable per node). The time warnings will be used in the future to do deadlock detection in userspace. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
98 lines
2.1 KiB
C
98 lines
2.1 KiB
C
/******************************************************************************
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*******************************************************************************
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**
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** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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** Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
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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 General Public License v.2.
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**
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*******************************************************************************
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******************************************************************************/
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#include "dlm_internal.h"
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#include "lockspace.h"
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#include "lock.h"
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#include "user.h"
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#include "memory.h"
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#include "config.h"
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#ifdef CONFIG_DLM_DEBUG
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int dlm_register_debugfs(void);
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void dlm_unregister_debugfs(void);
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#else
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static inline int dlm_register_debugfs(void) { return 0; }
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static inline void dlm_unregister_debugfs(void) { }
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#endif
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int dlm_netlink_init(void);
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void dlm_netlink_exit(void);
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static int __init init_dlm(void)
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{
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int error;
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error = dlm_memory_init();
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if (error)
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goto out;
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error = dlm_lockspace_init();
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if (error)
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goto out_mem;
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error = dlm_config_init();
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if (error)
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goto out_lockspace;
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error = dlm_register_debugfs();
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if (error)
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goto out_config;
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error = dlm_user_init();
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if (error)
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goto out_debug;
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error = dlm_netlink_init();
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if (error)
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goto out_user;
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printk("DLM (built %s %s) installed\n", __DATE__, __TIME__);
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return 0;
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out_user:
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dlm_user_exit();
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out_debug:
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dlm_unregister_debugfs();
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out_config:
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dlm_config_exit();
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out_lockspace:
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dlm_lockspace_exit();
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out_mem:
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dlm_memory_exit();
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out:
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return error;
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}
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static void __exit exit_dlm(void)
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{
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dlm_netlink_exit();
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dlm_user_exit();
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dlm_config_exit();
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dlm_memory_exit();
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dlm_lockspace_exit();
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dlm_unregister_debugfs();
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}
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module_init(init_dlm);
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module_exit(exit_dlm);
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MODULE_DESCRIPTION("Distributed Lock Manager");
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MODULE_AUTHOR("Red Hat, Inc.");
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MODULE_LICENSE("GPL");
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EXPORT_SYMBOL_GPL(dlm_new_lockspace);
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EXPORT_SYMBOL_GPL(dlm_release_lockspace);
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EXPORT_SYMBOL_GPL(dlm_lock);
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EXPORT_SYMBOL_GPL(dlm_unlock);
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