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1 | /****************************************************************************** |
2 | ******************************************************************************* |
3 | ** |
4 | ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
5 | ** Copyright (C) 2004-2008 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 __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 | * -ENOMEM if there is no memory to process request |
52 | * -EINVAL if there are invalid parameters |
53 | * -DLM_EUNLOCK if unlock request was successful |
54 | * -DLM_ECANCEL if a cancel completed successfully |
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 | #ifdef __KERNEL__ |
76 | |
77 | /* |
78 | * dlm_new_lockspace |
79 | * |
80 | * Starts a lockspace with the given name. If the named lockspace exists in |
81 | * the cluster, the calling node joins it. |
82 | */ |
83 | |
84 | int dlm_new_lockspace(const char *name, int namelen, |
85 | dlm_lockspace_t **lockspace, uint32_t flags, int lvblen); |
86 | |
87 | /* |
88 | * dlm_release_lockspace |
89 | * |
90 | * Stop a lockspace. |
91 | */ |
92 | |
93 | int dlm_release_lockspace(dlm_lockspace_t *lockspace, int force); |
94 | |
95 | /* |
96 | * dlm_lock |
97 | * |
98 | * Make an asyncronous request to acquire or convert a lock on a named |
99 | * resource. |
100 | * |
101 | * lockspace: context for the request |
102 | * mode: the requested mode of the lock (DLM_LOCK_) |
103 | * lksb: lock status block for input and async return values |
104 | * flags: input flags (DLM_LKF_) |
105 | * name: name of the resource to lock, can be binary |
106 | * namelen: the length in bytes of the resource name (MAX_RESNAME_LEN) |
107 | * parent: the lock ID of a parent lock or 0 if none |
108 | * lockast: function DLM executes when it completes processing the request |
109 | * astarg: argument passed to lockast and bast functions |
110 | * bast: function DLM executes when this lock later blocks another request |
111 | * |
112 | * Returns: |
113 | * 0 if request is successfully queued for processing |
114 | * -EINVAL if any input parameters are invalid |
115 | * -EAGAIN if request would block and is flagged DLM_LKF_NOQUEUE |
116 | * -ENOMEM if there is no memory to process request |
117 | * -ENOTCONN if there is a communication error |
118 | * |
119 | * If the call to dlm_lock returns an error then the operation has failed and |
120 | * the AST routine will not be called. If dlm_lock returns 0 it is still |
121 | * possible that the lock operation will fail. The AST routine will be called |
122 | * when the locking is complete and the status is returned in the lksb. |
123 | * |
124 | * If the AST routines or parameter are passed to a conversion operation then |
125 | * they will overwrite those values that were passed to a previous dlm_lock |
126 | * call. |
127 | * |
128 | * AST routines should not block (at least not for long), but may make |
129 | * any locking calls they please. |
130 | */ |
131 | |
132 | int dlm_lock(dlm_lockspace_t *lockspace, |
133 | int mode, |
134 | struct dlm_lksb *lksb, |
135 | uint32_t flags, |
136 | void *name, |
137 | unsigned int namelen, |
138 | uint32_t parent_lkid, |
139 | void (*lockast) (void *astarg), |
140 | void *astarg, |
141 | void (*bast) (void *astarg, int mode)); |
142 | |
143 | /* |
144 | * dlm_unlock |
145 | * |
146 | * Asynchronously release a lock on a resource. The AST routine is called |
147 | * when the resource is successfully unlocked. |
148 | * |
149 | * lockspace: context for the request |
150 | * lkid: the lock ID as returned in the lksb |
151 | * flags: input flags (DLM_LKF_) |
152 | * lksb: if NULL the lksb parameter passed to last lock request is used |
153 | * astarg: the arg used with the completion ast for the unlock |
154 | * |
155 | * Returns: |
156 | * 0 if request is successfully queued for processing |
157 | * -EINVAL if any input parameters are invalid |
158 | * -ENOTEMPTY if the lock still has sublocks |
159 | * -EBUSY if the lock is waiting for a remote lock operation |
160 | * -ENOTCONN if there is a communication error |
161 | */ |
162 | |
163 | int dlm_unlock(dlm_lockspace_t *lockspace, |
164 | uint32_t lkid, |
165 | uint32_t flags, |
166 | struct dlm_lksb *lksb, |
167 | void *astarg); |
168 | |
169 | #endif /* __KERNEL__ */ |
170 | |
171 | #endif /* __DLM_DOT_H__ */ |
172 | |
173 |
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