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01: /******************************************************************************
02: *******************************************************************************
03: **
04: **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
05: **  Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
06: **
07: **  This copyrighted material is made available to anyone wishing to use,
08: **  modify, copy, or redistribute it subject to the terms and conditions
09: **  of the GNU General Public License v.2.
10: **
11: *******************************************************************************
12: ******************************************************************************/
13: 
14: #ifndef __DLM_DOT_H__
15: #define __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: 
26: typedef 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: 
61: struct 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_NODIR          0x00000001
71: #define DLM_LSFL_TIMEWARN       0x00000002
72: #define DLM_LSFL_FS             0x00000004
73: #define DLM_LSFL_NEWEXCL        0x00000008
74: 
75: 
76: #endif                          /* __DLM_DOT_H__ */
77: 
78: 

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