1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* -*- mode: c; c-basic-offset: 8; -*- 3 * vim: noexpandtab sw=8 ts=8 sts=0: 4 * 5 * dlmapi.h 6 * 7 * externally exported dlm interfaces 8 * 9 * Copyright (C) 2004 Oracle. All rights reserved. 10 */ 11 12 #ifndef DLMAPI_H 13 #define DLMAPI_H 14 15 struct dlm_lock; 16 struct dlm_ctxt; 17 18 /* NOTE: changes made to this enum should be reflected in dlmdebug.c */ 19 enum dlm_status { 20 DLM_NORMAL = 0, /* 0: request in progress */ 21 DLM_GRANTED, /* 1: request granted */ 22 DLM_DENIED, /* 2: request denied */ 23 DLM_DENIED_NOLOCKS, /* 3: request denied, out of system resources */ 24 DLM_WORKING, /* 4: async request in progress */ 25 DLM_BLOCKED, /* 5: lock request blocked */ 26 DLM_BLOCKED_ORPHAN, /* 6: lock request blocked by a orphan lock*/ 27 DLM_DENIED_GRACE_PERIOD, /* 7: topological change in progress */ 28 DLM_SYSERR, /* 8: system error */ 29 DLM_NOSUPPORT, /* 9: unsupported */ 30 DLM_CANCELGRANT, /* 10: can't cancel convert: already granted */ 31 DLM_IVLOCKID, /* 11: bad lockid */ 32 DLM_SYNC, /* 12: synchronous request granted */ 33 DLM_BADTYPE, /* 13: bad resource type */ 34 DLM_BADRESOURCE, /* 14: bad resource handle */ 35 DLM_MAXHANDLES, /* 15: no more resource handles */ 36 DLM_NOCLINFO, /* 16: can't contact cluster manager */ 37 DLM_NOLOCKMGR, /* 17: can't contact lock manager */ 38 DLM_NOPURGED, /* 18: can't contact purge daemon */ 39 DLM_BADARGS, /* 19: bad api args */ 40 DLM_VOID, /* 20: no status */ 41 DLM_NOTQUEUED, /* 21: NOQUEUE was specified and request failed */ 42 DLM_IVBUFLEN, /* 22: invalid resource name length */ 43 DLM_CVTUNGRANT, /* 23: attempted to convert ungranted lock */ 44 DLM_BADPARAM, /* 24: invalid lock mode specified */ 45 DLM_VALNOTVALID, /* 25: value block has been invalidated */ 46 DLM_REJECTED, /* 26: request rejected, unrecognized client */ 47 DLM_ABORT, /* 27: blocked lock request cancelled */ 48 DLM_CANCEL, /* 28: conversion request cancelled */ 49 DLM_IVRESHANDLE, /* 29: invalid resource handle */ 50 DLM_DEADLOCK, /* 30: deadlock recovery refused this request */ 51 DLM_DENIED_NOASTS, /* 31: failed to allocate AST */ 52 DLM_FORWARD, /* 32: request must wait for primary's response */ 53 DLM_TIMEOUT, /* 33: timeout value for lock has expired */ 54 DLM_IVGROUPID, /* 34: invalid group specification */ 55 DLM_VERS_CONFLICT, /* 35: version conflicts prevent request handling */ 56 DLM_BAD_DEVICE_PATH, /* 36: Locks device does not exist or path wrong */ 57 DLM_NO_DEVICE_PERMISSION, /* 37: Client has insufficient pers for device */ 58 DLM_NO_CONTROL_DEVICE, /* 38: Cannot set options on opened device */ 59 60 DLM_RECOVERING, /* 39: extension, allows caller to fail a lock 61 request if it is being recovered */ 62 DLM_MIGRATING, /* 40: extension, allows caller to fail a lock 63 request if it is being migrated */ 64 DLM_MAXSTATS, /* 41: upper limit for return code validation */ 65 }; 66 67 /* for pretty-printing dlm_status error messages */ 68 const char *dlm_errmsg(enum dlm_status err); 69 /* for pretty-printing dlm_status error names */ 70 const char *dlm_errname(enum dlm_status err); 71 72 /* Eventually the DLM will use standard errno values, but in the 73 * meantime this lets us track dlm errors as they bubble up. When we 74 * bring its error reporting into line with the rest of the stack, 75 * these can just be replaced with calls to mlog_errno. */ 76 #define dlm_error(st) do { \ 77 if ((st) != DLM_RECOVERING && \ 78 (st) != DLM_MIGRATING && \ 79 (st) != DLM_FORWARD) \ 80 mlog(ML_ERROR, "dlm status = %s\n", dlm_errname((st))); \ 81 } while (0) 82 83 #define DLM_LKSB_UNUSED1 0x01 84 #define DLM_LKSB_PUT_LVB 0x02 85 #define DLM_LKSB_GET_LVB 0x04 86 #define DLM_LKSB_UNUSED2 0x08 87 #define DLM_LKSB_UNUSED3 0x10 88 #define DLM_LKSB_UNUSED4 0x20 89 #define DLM_LKSB_UNUSED5 0x40 90 #define DLM_LKSB_UNUSED6 0x80 91 92 #define DLM_LVB_LEN 64 93 94 /* Callers are only allowed access to the lvb and status members of 95 * this struct. */ 96 struct dlm_lockstatus { 97 enum dlm_status status; 98 u32 flags; 99 struct dlm_lock *lockid; 100 char lvb[DLM_LVB_LEN]; 101 }; 102 103 /* Valid lock modes. */ 104 #define LKM_IVMODE (-1) /* invalid mode */ 105 #define LKM_NLMODE 0 /* null lock */ 106 #define LKM_CRMODE 1 /* concurrent read unsupported */ 107 #define LKM_CWMODE 2 /* concurrent write unsupported */ 108 #define LKM_PRMODE 3 /* protected read */ 109 #define LKM_PWMODE 4 /* protected write unsupported */ 110 #define LKM_EXMODE 5 /* exclusive */ 111 #define LKM_MAXMODE 5 112 #define LKM_MODEMASK 0xff 113 114 /* Flags passed to dlmlock and dlmunlock: 115 * reserved: flags used by the "real" dlm 116 * only a few are supported by this dlm 117 * (U) = unsupported by ocfs2 dlm */ 118 #define LKM_ORPHAN 0x00000010 /* this lock is orphanable (U) */ 119 #define LKM_PARENTABLE 0x00000020 /* this lock was orphaned (U) */ 120 #define LKM_BLOCK 0x00000040 /* blocking lock request (U) */ 121 #define LKM_LOCAL 0x00000080 /* local lock request */ 122 #define LKM_VALBLK 0x00000100 /* lock value block request */ 123 #define LKM_NOQUEUE 0x00000200 /* non blocking request */ 124 #define LKM_CONVERT 0x00000400 /* conversion request */ 125 #define LKM_NODLCKWT 0x00000800 /* this lock wont deadlock (U) */ 126 #define LKM_UNLOCK 0x00001000 /* deallocate this lock */ 127 #define LKM_CANCEL 0x00002000 /* cancel conversion request */ 128 #define LKM_DEQALL 0x00004000 /* remove all locks held by proc (U) */ 129 #define LKM_INVVALBLK 0x00008000 /* invalidate lock value block */ 130 #define LKM_SYNCSTS 0x00010000 /* return synchronous status if poss (U) */ 131 #define LKM_TIMEOUT 0x00020000 /* lock request contains timeout (U) */ 132 #define LKM_SNGLDLCK 0x00040000 /* request can self-deadlock (U) */ 133 #define LKM_FINDLOCAL 0x00080000 /* find local lock request (U) */ 134 #define LKM_PROC_OWNED 0x00100000 /* owned by process, not group (U) */ 135 #define LKM_XID 0x00200000 /* use transaction id for deadlock (U) */ 136 #define LKM_XID_CONFLICT 0x00400000 /* do not allow lock inheritance (U) */ 137 #define LKM_FORCE 0x00800000 /* force unlock flag */ 138 #define LKM_REVVALBLK 0x01000000 /* temporary solution: re-validate 139 lock value block (U) */ 140 /* unused */ 141 #define LKM_UNUSED1 0x00000001 /* unused */ 142 #define LKM_UNUSED2 0x00000002 /* unused */ 143 #define LKM_UNUSED3 0x00000004 /* unused */ 144 #define LKM_UNUSED4 0x00000008 /* unused */ 145 #define LKM_UNUSED5 0x02000000 /* unused */ 146 #define LKM_UNUSED6 0x04000000 /* unused */ 147 #define LKM_UNUSED7 0x08000000 /* unused */ 148 149 /* ocfs2 extensions: internal only 150 * should never be used by caller */ 151 #define LKM_MIGRATION 0x10000000 /* extension: lockres is to be migrated 152 to another node */ 153 #define LKM_PUT_LVB 0x20000000 /* extension: lvb is being passed 154 should be applied to lockres */ 155 #define LKM_GET_LVB 0x40000000 /* extension: lvb should be copied 156 from lockres when lock is granted */ 157 #define LKM_RECOVERY 0x80000000 /* extension: flag for recovery lock 158 used to avoid recovery rwsem */ 159 160 161 typedef void (dlm_astlockfunc_t)(void *); 162 typedef void (dlm_bastlockfunc_t)(void *, int); 163 typedef void (dlm_astunlockfunc_t)(void *, enum dlm_status); 164 165 enum dlm_status dlmlock(struct dlm_ctxt *dlm, 166 int mode, 167 struct dlm_lockstatus *lksb, 168 int flags, 169 const char *name, 170 int namelen, 171 dlm_astlockfunc_t *ast, 172 void *data, 173 dlm_bastlockfunc_t *bast); 174 175 enum dlm_status dlmunlock(struct dlm_ctxt *dlm, 176 struct dlm_lockstatus *lksb, 177 int flags, 178 dlm_astunlockfunc_t *unlockast, 179 void *data); 180 181 struct dlm_protocol_version { 182 u8 pv_major; 183 u8 pv_minor; 184 }; 185 struct dlm_ctxt * dlm_register_domain(const char *domain, u32 key, 186 struct dlm_protocol_version *fs_proto); 187 188 void dlm_unregister_domain(struct dlm_ctxt *dlm); 189 190 void dlm_print_one_lock(struct dlm_lock *lockid); 191 192 typedef void (dlm_eviction_func)(int, void *); 193 struct dlm_eviction_cb { 194 struct list_head ec_item; 195 dlm_eviction_func *ec_func; 196 void *ec_data; 197 }; 198 void dlm_setup_eviction_cb(struct dlm_eviction_cb *cb, 199 dlm_eviction_func *f, 200 void *data); 201 void dlm_register_eviction_cb(struct dlm_ctxt *dlm, 202 struct dlm_eviction_cb *cb); 203 void dlm_unregister_eviction_cb(struct dlm_eviction_cb *cb); 204 205 #endif /* DLMAPI_H */ 206