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Diffstat (limited to 'fs/ocfs2/dlm/dlmapi.h')
| -rw-r--r-- | fs/ocfs2/dlm/dlmapi.h | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/fs/ocfs2/dlm/dlmapi.h b/fs/ocfs2/dlm/dlmapi.h new file mode 100644 index 000000000000..53652f51c0e1 --- /dev/null +++ b/fs/ocfs2/dlm/dlmapi.h @@ -0,0 +1,214 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * dlmapi.h + * + * externally exported dlm interfaces + * + * Copyright (C) 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + */ + +#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, + 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_ctxt * dlm_register_domain(const char *domain, u32 key); + +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 */ |