blob: 1f73cc06168f7d78c59052241b3cf9279801c298 [file] [log] [blame]
David Howells607ca462012-10-13 10:46:48 +01001/******************************************************************************
2*******************************************************************************
3**
4** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
5** Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
6**
7** This copyrighted material is made available to anyone wishing to use,
8** modify, copy, or redistribute it subject to the terms and conditions
9** of the GNU General Public License v.2.
10**
11*******************************************************************************
12******************************************************************************/
13
14#ifndef _UAPI__DLM_DOT_H__
15#define _UAPI__DLM_DOT_H__
16
17/*
18 * Interface to Distributed Lock Manager (DLM)
19 * routines and structures to use DLM lockspaces
20 */
21
22/* Lock levels and flags are here */
23#include <linux/dlmconstants.h>
24#include <linux/types.h>
25
26typedef void dlm_lockspace_t;
27
28/*
29 * Lock status block
30 *
31 * Use this structure to specify the contents of the lock value block. For a
32 * conversion request, this structure is used to specify the lock ID of the
33 * lock. DLM writes the status of the lock request and the lock ID assigned
34 * to the request in the lock status block.
35 *
36 * sb_lkid: the returned lock ID. It is set on new (non-conversion) requests.
37 * It is available when dlm_lock returns.
38 *
39 * sb_lvbptr: saves or returns the contents of the lock's LVB according to rules
40 * shown for the DLM_LKF_VALBLK flag.
41 *
42 * sb_flags: DLM_SBF_DEMOTED is returned if in the process of promoting a lock,
43 * it was first demoted to NL to avoid conversion deadlock.
44 * DLM_SBF_VALNOTVALID is returned if the resource's LVB is marked invalid.
45 *
46 * sb_status: the returned status of the lock request set prior to AST
47 * execution. Possible return values:
48 *
49 * 0 if lock request was successful
50 * -EAGAIN if request would block and is flagged DLM_LKF_NOQUEUE
51 * -DLM_EUNLOCK if unlock request was successful
52 * -DLM_ECANCEL if a cancel completed successfully
53 * -EDEADLK if a deadlock was detected
54 * -ETIMEDOUT if the lock request was canceled due to a timeout
55 */
56
57#define DLM_SBF_DEMOTED 0x01
58#define DLM_SBF_VALNOTVALID 0x02
59#define DLM_SBF_ALTMODE 0x04
60
61struct dlm_lksb {
62 int sb_status;
63 __u32 sb_lkid;
64 char sb_flags;
65 char * sb_lvbptr;
66};
67
68/* dlm_new_lockspace() flags */
69
70#define DLM_LSFL_TIMEWARN 0x00000002
71#define DLM_LSFL_FS 0x00000004
72#define DLM_LSFL_NEWEXCL 0x00000008
73
74
75#endif /* _UAPI__DLM_DOT_H__ */