e7fd41792f
This is the core of the distributed lock manager which is required to use GFS2 as a cluster filesystem. It is also used by CLVM and can be used as a standalone lock manager independantly of either of these two projects. It implements VAX-style locking modes. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steve Whitehouse <swhiteho@redhat.com>
85 lines
2.2 KiB
C
85 lines
2.2 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) 2004-2005 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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/* This is the device interface for dlm, most users will use a library
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* interface.
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*/
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#define DLM_USER_LVB_LEN 32
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/* Version of the device interface */
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#define DLM_DEVICE_VERSION_MAJOR 3
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#define DLM_DEVICE_VERSION_MINOR 0
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#define DLM_DEVICE_VERSION_PATCH 0
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/* struct passed to the lock write */
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struct dlm_lock_params {
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__u8 mode;
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__u16 flags;
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__u32 lkid;
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__u32 parent;
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struct dlm_range range;
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__u8 namelen;
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void __user *castparam;
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void __user *castaddr;
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void __user *bastparam;
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void __user *bastaddr;
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struct dlm_lksb __user *lksb;
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char lvb[DLM_USER_LVB_LEN];
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char name[1];
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};
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struct dlm_lspace_params {
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__u32 flags;
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__u32 minor;
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char name[1];
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};
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struct dlm_write_request {
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__u32 version[3];
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__u8 cmd;
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union {
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struct dlm_lock_params lock;
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struct dlm_lspace_params lspace;
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} i;
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};
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/* struct read from the "device" fd,
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consists mainly of userspace pointers for the library to use */
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struct dlm_lock_result {
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__u32 length;
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void __user * user_astaddr;
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void __user * user_astparam;
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struct dlm_lksb __user * user_lksb;
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struct dlm_lksb lksb;
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__u8 bast_mode;
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/* Offsets may be zero if no data is present */
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__u32 lvb_offset;
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};
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/* Commands passed to the device */
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#define DLM_USER_LOCK 1
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#define DLM_USER_UNLOCK 2
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#define DLM_USER_QUERY 3
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#define DLM_USER_CREATE_LOCKSPACE 4
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#define DLM_USER_REMOVE_LOCKSPACE 5
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/* Arbitrary length restriction */
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#define MAX_LS_NAME_LEN 64
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/* Lockspace flags */
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#define DLM_USER_LSFLG_AUTOFREE 1
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#define DLM_USER_LSFLG_FORCEFREE 2
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