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dlm.h
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1 /******************************************************************************
2 *******************************************************************************
3 **
4 ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
5 ** Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
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7 ** This copyrighted material is made available to anyone wishing to use,
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9 ** of the GNU General Public License v.2.
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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 
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;
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__ */