1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
2 | /****************************************************************************** |
3 | ******************************************************************************* |
4 | ** |
5 | ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
6 | ** Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved. |
7 | ** |
8 | ** This copyrighted material is made available to anyone wishing to use, |
9 | ** modify, copy, or redistribute it subject to the terms and conditions |
10 | ** of the GNU General Public License v.2. |
11 | ** |
12 | ******************************************************************************* |
13 | ******************************************************************************/ |
14 | |
15 | #ifndef _UAPI__DLM_DOT_H__ |
16 | #define _UAPI__DLM_DOT_H__ |
17 | |
18 | /* |
19 | * Interface to Distributed Lock Manager (DLM) |
20 | * routines and structures to use DLM lockspaces |
21 | */ |
22 | |
23 | /* Lock levels and flags are here */ |
24 | #include <linux/dlmconstants.h> |
25 | #include <linux/types.h> |
26 | |
27 | typedef void dlm_lockspace_t; |
28 | |
29 | /* |
30 | * Lock status block |
31 | * |
32 | * Use this structure to specify the contents of the lock value block. For a |
33 | * conversion request, this structure is used to specify the lock ID of the |
34 | * lock. DLM writes the status of the lock request and the lock ID assigned |
35 | * to the request in the lock status block. |
36 | * |
37 | * sb_lkid: the returned lock ID. It is set on new (non-conversion) requests. |
38 | * It is available when dlm_lock returns. |
39 | * |
40 | * sb_lvbptr: saves or returns the contents of the lock's LVB according to rules |
41 | * shown for the DLM_LKF_VALBLK flag. |
42 | * |
43 | * sb_flags: DLM_SBF_DEMOTED is returned if in the process of promoting a lock, |
44 | * it was first demoted to NL to avoid conversion deadlock. |
45 | * DLM_SBF_VALNOTVALID is returned if the resource's LVB is marked invalid. |
46 | * |
47 | * sb_status: the returned status of the lock request set prior to AST |
48 | * execution. Possible return values: |
49 | * |
50 | * 0 if lock request was successful |
51 | * -EAGAIN if request would block and is flagged DLM_LKF_NOQUEUE |
52 | * -DLM_EUNLOCK if unlock request was successful |
53 | * -DLM_ECANCEL if a cancel completed successfully |
54 | * -EDEADLK if a deadlock was detected |
55 | * -ETIMEDOUT if the lock request was canceled due to a timeout |
56 | */ |
57 | |
58 | #define DLM_SBF_DEMOTED 0x01 |
59 | #define DLM_SBF_VALNOTVALID 0x02 |
60 | #define DLM_SBF_ALTMODE 0x04 |
61 | |
62 | struct dlm_lksb { |
63 | int sb_status; |
64 | __u32 sb_lkid; |
65 | char sb_flags; |
66 | char * sb_lvbptr; |
67 | }; |
68 | |
69 | /* dlm_new_lockspace() flags */ |
70 | |
71 | /* DLM_LSFL_TIMEWARN is deprecated and reserved. DO NOT USE! */ |
72 | #define DLM_LSFL_TIMEWARN 0x00000002 |
73 | #define DLM_LSFL_NEWEXCL 0x00000008 |
74 | |
75 | |
76 | #endif /* _UAPI__DLM_DOT_H__ */ |
77 | |