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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. | |
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 | ||
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_TIMEWARN 0x00000002 | |
71 | #define DLM_LSFL_FS 0x00000004 | |
72 | #define DLM_LSFL_NEWEXCL 0x00000008 | |
73 | ||
74 | ||
75 | #endif /* _UAPI__DLM_DOT_H__ */ |