1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* dlmapi.h
*
* externally exported dlm interfaces
*
* Copyright (C) 2004 Oracle. All rights reserved.
*/
#ifndef DLMAPI_H
#define DLMAPI_H
struct dlm_lock;
struct dlm_ctxt;
/* NOTE: changes made to this enum should be reflected in dlmdebug.c */
enum dlm_status {
DLM_NORMAL = 0, /* 0: request in progress */
DLM_GRANTED, /* 1: request granted */
DLM_DENIED, /* 2: request denied */
DLM_DENIED_NOLOCKS, /* 3: request denied, out of system resources */
DLM_WORKING, /* 4: async request in progress */
DLM_BLOCKED, /* 5: lock request blocked */
DLM_BLOCKED_ORPHAN, /* 6: lock request blocked by a orphan lock*/
DLM_DENIED_GRACE_PERIOD, /* 7: topological change in progress */
DLM_SYSERR, /* 8: system error */
DLM_NOSUPPORT, /* 9: unsupported */
DLM_CANCELGRANT, /* 10: can't cancel convert: already granted */
DLM_IVLOCKID, /* 11: bad lockid */
DLM_SYNC, /* 12: synchronous request granted */
DLM_BADTYPE, /* 13: bad resource type */
DLM_BADRESOURCE, /* 14: bad resource handle */
DLM_MAXHANDLES, /* 15: no more resource handles */
DLM_NOCLINFO, /* 16: can't contact cluster manager */
DLM_NOLOCKMGR, /* 17: can't contact lock manager */
DLM_NOPURGED, /* 18: can't contact purge daemon */
DLM_BADARGS, /* 19: bad api args */
DLM_VOID, /* 20: no status */
DLM_NOTQUEUED, /* 21: NOQUEUE was specified and request failed */
DLM_IVBUFLEN, /* 22: invalid resource name length */
DLM_CVTUNGRANT, /* 23: attempted to convert ungranted lock */
DLM_BADPARAM, /* 24: invalid lock mode specified */
DLM_VALNOTVALID, /* 25: value block has been invalidated */
DLM_REJECTED, /* 26: request rejected, unrecognized client */
DLM_ABORT, /* 27: blocked lock request cancelled */
DLM_CANCEL, /* 28: conversion request cancelled */
DLM_IVRESHANDLE, /* 29: invalid resource handle */
DLM_DEADLOCK, /* 30: deadlock recovery refused this request */
DLM_DENIED_NOASTS, /* 31: failed to allocate AST */
DLM_FORWARD, /* 32: request must wait for primary's response */
DLM_TIMEOUT, /* 33: timeout value for lock has expired */
DLM_IVGROUPID, /* 34: invalid group specification */
DLM_VERS_CONFLICT, /* 35: version conflicts prevent request handling */
DLM_BAD_DEVICE_PATH, /* 36: Locks device does not exist or path wrong */
DLM_NO_DEVICE_PERMISSION, /* 37: Client has insufficient pers for device */
DLM_NO_CONTROL_DEVICE, /* 38: Cannot set options on opened device */
DLM_RECOVERING, /* 39: extension, allows caller to fail a lock
request if it is being recovered */
DLM_MIGRATING, /* 40: extension, allows caller to fail a lock
request if it is being migrated */
DLM_MAXSTATS, /* 41: upper limit for return code validation */
};
/* for pretty-printing dlm_status error messages */
const char *dlm_errmsg(enum dlm_status err);
/* for pretty-printing dlm_status error names */
const char *dlm_errname(enum dlm_status err);
/* Eventually the DLM will use standard errno values, but in the
* meantime this lets us track dlm errors as they bubble up. When we
* bring its error reporting into line with the rest of the stack,
* these can just be replaced with calls to mlog_errno. */
#define dlm_error(st) do { \
if ((st) != DLM_RECOVERING && \
(st) != DLM_MIGRATING && \
(st) != DLM_FORWARD) \
mlog(ML_ERROR, "dlm status = %s\n", dlm_errname((st))); \
} while (0)
#define DLM_LKSB_UNUSED1 0x01
#define DLM_LKSB_PUT_LVB 0x02
#define DLM_LKSB_GET_LVB 0x04
#define DLM_LKSB_UNUSED2 0x08
#define DLM_LKSB_UNUSED3 0x10
#define DLM_LKSB_UNUSED4 0x20
#define DLM_LKSB_UNUSED5 0x40
#define DLM_LKSB_UNUSED6 0x80
#define DLM_LVB_LEN 64
/* Callers are only allowed access to the lvb and status members of
* this struct. */
struct dlm_lockstatus {
enum dlm_status status;
u32 flags;
struct dlm_lock *lockid;
char lvb[DLM_LVB_LEN];
};
/* Valid lock modes. */
#define LKM_IVMODE (-1) /* invalid mode */
#define LKM_NLMODE 0 /* null lock */
#define LKM_CRMODE 1 /* concurrent read unsupported */
#define LKM_CWMODE 2 /* concurrent write unsupported */
#define LKM_PRMODE 3 /* protected read */
#define LKM_PWMODE 4 /* protected write unsupported */
#define LKM_EXMODE 5 /* exclusive */
#define LKM_MAXMODE 5
#define LKM_MODEMASK 0xff
/* Flags passed to dlmlock and dlmunlock:
* reserved: flags used by the "real" dlm
* only a few are supported by this dlm
* (U) = unsupported by ocfs2 dlm */
#define LKM_ORPHAN 0x00000010 /* this lock is orphanable (U) */
#define LKM_PARENTABLE 0x00000020 /* this lock was orphaned (U) */
#define LKM_BLOCK 0x00000040 /* blocking lock request (U) */
#define LKM_LOCAL 0x00000080 /* local lock request */
#define LKM_VALBLK 0x00000100 /* lock value block request */
#define LKM_NOQUEUE 0x00000200 /* non blocking request */
#define LKM_CONVERT 0x00000400 /* conversion request */
#define LKM_NODLCKWT 0x00000800 /* this lock wont deadlock (U) */
#define LKM_UNLOCK 0x00001000 /* deallocate this lock */
#define LKM_CANCEL 0x00002000 /* cancel conversion request */
#define LKM_DEQALL 0x00004000 /* remove all locks held by proc (U) */
#define LKM_INVVALBLK 0x00008000 /* invalidate lock value block */
#define LKM_SYNCSTS 0x00010000 /* return synchronous status if poss (U) */
#define LKM_TIMEOUT 0x00020000 /* lock request contains timeout (U) */
#define LKM_SNGLDLCK 0x00040000 /* request can self-deadlock (U) */
#define LKM_FINDLOCAL 0x00080000 /* find local lock request (U) */
#define LKM_PROC_OWNED 0x00100000 /* owned by process, not group (U) */
#define LKM_XID 0x00200000 /* use transaction id for deadlock (U) */
#define LKM_XID_CONFLICT 0x00400000 /* do not allow lock inheritance (U) */
#define LKM_FORCE 0x00800000 /* force unlock flag */
#define LKM_REVVALBLK 0x01000000 /* temporary solution: re-validate
lock value block (U) */
/* unused */
#define LKM_UNUSED1 0x00000001 /* unused */
#define LKM_UNUSED2 0x00000002 /* unused */
#define LKM_UNUSED3 0x00000004 /* unused */
#define LKM_UNUSED4 0x00000008 /* unused */
#define LKM_UNUSED5 0x02000000 /* unused */
#define LKM_UNUSED6 0x04000000 /* unused */
#define LKM_UNUSED7 0x08000000 /* unused */
/* ocfs2 extensions: internal only
* should never be used by caller */
#define LKM_MIGRATION 0x10000000 /* extension: lockres is to be migrated
to another node */
#define LKM_PUT_LVB 0x20000000 /* extension: lvb is being passed
should be applied to lockres */
#define LKM_GET_LVB 0x40000000 /* extension: lvb should be copied
from lockres when lock is granted */
#define LKM_RECOVERY 0x80000000 /* extension: flag for recovery lock
used to avoid recovery rwsem */
typedef void (dlm_astlockfunc_t)(void *);
typedef void (dlm_bastlockfunc_t)(void *, int);
typedef void (dlm_astunlockfunc_t)(void *, enum dlm_status);
enum dlm_status dlmlock(struct dlm_ctxt *dlm,
int mode,
struct dlm_lockstatus *lksb,
int flags,
const char *name,
int namelen,
dlm_astlockfunc_t *ast,
void *data,
dlm_bastlockfunc_t *bast);
enum dlm_status dlmunlock(struct dlm_ctxt *dlm,
struct dlm_lockstatus *lksb,
int flags,
dlm_astunlockfunc_t *unlockast,
void *data);
struct dlm_protocol_version {
u8 pv_major;
u8 pv_minor;
};
struct dlm_ctxt * dlm_register_domain(const char *domain, u32 key,
struct dlm_protocol_version *fs_proto);
void dlm_unregister_domain(struct dlm_ctxt *dlm);
void dlm_print_one_lock(struct dlm_lock *lockid);
typedef void (dlm_eviction_func)(int, void *);
struct dlm_eviction_cb {
struct list_head ec_item;
dlm_eviction_func *ec_func;
void *ec_data;
};
void dlm_setup_eviction_cb(struct dlm_eviction_cb *cb,
dlm_eviction_func *f,
void *data);
void dlm_register_eviction_cb(struct dlm_ctxt *dlm,
struct dlm_eviction_cb *cb);
void dlm_unregister_eviction_cb(struct dlm_eviction_cb *cb);
#endif /* DLMAPI_H */
|
