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1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * stackglue.c | |
5 | * | |
6 | * Code which implements an OCFS2 specific interface to underlying | |
7 | * cluster stacks. | |
8 | * | |
9 | * Copyright (C) 2007 Oracle. All rights reserved. | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public | |
13 | * License as published by the Free Software Foundation, version 2. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | */ | |
20 | ||
24ef1815 JB |
21 | #include "stackglue.h" |
22 | ||
23 | static struct ocfs2_locking_protocol *lproto; | |
24 | ||
bd3e7610 JB |
25 | /* These should be identical */ |
26 | #if (DLM_LOCK_IV != LKM_IVMODE) | |
27 | # error Lock modes do not match | |
28 | #endif | |
29 | #if (DLM_LOCK_NL != LKM_NLMODE) | |
30 | # error Lock modes do not match | |
31 | #endif | |
32 | #if (DLM_LOCK_CR != LKM_CRMODE) | |
33 | # error Lock modes do not match | |
34 | #endif | |
35 | #if (DLM_LOCK_CW != LKM_CWMODE) | |
36 | # error Lock modes do not match | |
37 | #endif | |
38 | #if (DLM_LOCK_PR != LKM_PRMODE) | |
39 | # error Lock modes do not match | |
40 | #endif | |
41 | #if (DLM_LOCK_PW != LKM_PWMODE) | |
42 | # error Lock modes do not match | |
43 | #endif | |
44 | #if (DLM_LOCK_EX != LKM_EXMODE) | |
45 | # error Lock modes do not match | |
46 | #endif | |
47 | static inline int mode_to_o2dlm(int mode) | |
48 | { | |
49 | BUG_ON(mode > LKM_MAXMODE); | |
50 | ||
51 | return mode; | |
52 | } | |
53 | ||
54 | #define map_flag(_generic, _o2dlm) \ | |
55 | if (flags & (_generic)) { \ | |
56 | flags &= ~(_generic); \ | |
57 | o2dlm_flags |= (_o2dlm); \ | |
58 | } | |
59 | static int flags_to_o2dlm(u32 flags) | |
60 | { | |
61 | int o2dlm_flags = 0; | |
62 | ||
63 | map_flag(DLM_LKF_NOQUEUE, LKM_NOQUEUE); | |
64 | map_flag(DLM_LKF_CANCEL, LKM_CANCEL); | |
65 | map_flag(DLM_LKF_CONVERT, LKM_CONVERT); | |
66 | map_flag(DLM_LKF_VALBLK, LKM_VALBLK); | |
67 | map_flag(DLM_LKF_IVVALBLK, LKM_INVVALBLK); | |
68 | map_flag(DLM_LKF_ORPHAN, LKM_ORPHAN); | |
69 | map_flag(DLM_LKF_FORCEUNLOCK, LKM_FORCE); | |
70 | map_flag(DLM_LKF_TIMEOUT, LKM_TIMEOUT); | |
71 | map_flag(DLM_LKF_LOCAL, LKM_LOCAL); | |
72 | ||
73 | /* map_flag() should have cleared every flag passed in */ | |
74 | BUG_ON(flags != 0); | |
75 | ||
76 | return o2dlm_flags; | |
77 | } | |
78 | #undef map_flag | |
79 | ||
24ef1815 JB |
80 | enum dlm_status ocfs2_dlm_lock(struct dlm_ctxt *dlm, |
81 | int mode, | |
82 | struct dlm_lockstatus *lksb, | |
83 | u32 flags, | |
84 | void *name, | |
85 | unsigned int namelen, | |
86 | void *astarg) | |
87 | { | |
bd3e7610 JB |
88 | int o2dlm_mode = mode_to_o2dlm(mode); |
89 | int o2dlm_flags = flags_to_o2dlm(flags); | |
90 | ||
24ef1815 | 91 | BUG_ON(lproto == NULL); |
bd3e7610 JB |
92 | |
93 | return dlmlock(dlm, o2dlm_mode, lksb, o2dlm_flags, name, namelen, | |
24ef1815 JB |
94 | lproto->lp_lock_ast, astarg, |
95 | lproto->lp_blocking_ast); | |
96 | } | |
97 | ||
98 | enum dlm_status ocfs2_dlm_unlock(struct dlm_ctxt *dlm, | |
99 | struct dlm_lockstatus *lksb, | |
100 | u32 flags, | |
101 | void *astarg) | |
102 | { | |
bd3e7610 JB |
103 | int o2dlm_flags = flags_to_o2dlm(flags); |
104 | ||
24ef1815 JB |
105 | BUG_ON(lproto == NULL); |
106 | ||
bd3e7610 JB |
107 | return dlmunlock(dlm, lksb, o2dlm_flags, |
108 | lproto->lp_unlock_ast, astarg); | |
24ef1815 JB |
109 | } |
110 | ||
111 | ||
112 | void o2cb_get_stack(struct ocfs2_locking_protocol *proto) | |
113 | { | |
114 | BUG_ON(proto == NULL); | |
115 | ||
116 | lproto = proto; | |
117 | } | |
118 | ||
119 | void o2cb_put_stack(void) | |
120 | { | |
121 | lproto = NULL; | |
122 | } |