fs/ocfs2/dlm/dlmapi.h

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * dlmapi.h
   5  *
   6  * externally exported dlm interfaces
   7  *
   8  * Copyright (C) 2004 Oracle.  All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2 of the License, or (at your option) any later version.
  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  * You should have received a copy of the GNU General Public
  21  * License along with this program; if not, write to the
  22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23  * Boston, MA 021110-1307, USA.
  24  *
  25  */
  26
  27 #ifndef DLMAPI_H
  28 #define DLMAPI_H
  29
  30 struct dlm_lock;
  31 struct dlm_ctxt;
  32
  33 /* NOTE: changes made to this enum should be reflected in dlmdebug.c */
  34 enum dlm_status {
  35         DLM_NORMAL = 0,           /*  0: request in progress */
  36         DLM_GRANTED,              /*  1: request granted */
  37         DLM_DENIED,               /*  2: request denied */
  38         DLM_DENIED_NOLOCKS,       /*  3: request denied, out of system resources */
  39         DLM_WORKING,              /*  4: async request in progress */
  40         DLM_BLOCKED,              /*  5: lock request blocked */
  41         DLM_BLOCKED_ORPHAN,       /*  6: lock request blocked by a orphan lock*/
  42         DLM_DENIED_GRACE_PERIOD,  /*  7: topological change in progress */
  43         DLM_SYSERR,               /*  8: system error */
  44         DLM_NOSUPPORT,            /*  9: unsupported */
  45         DLM_CANCELGRANT,          /* 10: can't cancel convert: already granted */
  46         DLM_IVLOCKID,             /* 11: bad lockid */
  47         DLM_SYNC,                 /* 12: synchronous request granted */
  48         DLM_BADTYPE,              /* 13: bad resource type */
  49         DLM_BADRESOURCE,          /* 14: bad resource handle */
  50         DLM_MAXHANDLES,           /* 15: no more resource handles */
  51         DLM_NOCLINFO,             /* 16: can't contact cluster manager */
  52         DLM_NOLOCKMGR,            /* 17: can't contact lock manager */
  53         DLM_NOPURGED,             /* 18: can't contact purge daemon */
  54         DLM_BADARGS,              /* 19: bad api args */
  55         DLM_VOID,                 /* 20: no status */
  56         DLM_NOTQUEUED,            /* 21: NOQUEUE was specified and request failed */
  57         DLM_IVBUFLEN,             /* 22: invalid resource name length */
  58         DLM_CVTUNGRANT,           /* 23: attempted to convert ungranted lock */
  59         DLM_BADPARAM,             /* 24: invalid lock mode specified */
  60         DLM_VALNOTVALID,          /* 25: value block has been invalidated */
  61         DLM_REJECTED,             /* 26: request rejected, unrecognized client */
  62         DLM_ABORT,                /* 27: blocked lock request cancelled */
  63         DLM_CANCEL,               /* 28: conversion request cancelled */
  64         DLM_IVRESHANDLE,          /* 29: invalid resource handle */
  65         DLM_DEADLOCK,             /* 30: deadlock recovery refused this request */
  66         DLM_DENIED_NOASTS,        /* 31: failed to allocate AST */
  67         DLM_FORWARD,              /* 32: request must wait for primary's response */
  68         DLM_TIMEOUT,              /* 33: timeout value for lock has expired */
  69         DLM_IVGROUPID,            /* 34: invalid group specification */
  70         DLM_VERS_CONFLICT,        /* 35: version conflicts prevent request handling */
  71         DLM_BAD_DEVICE_PATH,      /* 36: Locks device does not exist or path wrong */
  72         DLM_NO_DEVICE_PERMISSION, /* 37: Client has insufficient pers for device */
  73         DLM_NO_CONTROL_DEVICE,    /* 38: Cannot set options on opened device */
  74
  75         DLM_RECOVERING,           /* 39: extension, allows caller to fail a lock
  76                                      request if it is being recovered */
  77         DLM_MIGRATING,            /* 40: extension, allows caller to fail a lock
  78                                      request if it is being migrated */
  79         DLM_MAXSTATS,             /* 41: upper limit for return code validation */
  80 };
  81
  82 /* for pretty-printing dlm_status error messages */
  83 const char *dlm_errmsg(enum dlm_status err);
  84 /* for pretty-printing dlm_status error names */
  85 const char *dlm_errname(enum dlm_status err);
  86
  87 /* Eventually the DLM will use standard errno values, but in the
  88  * meantime this lets us track dlm errors as they bubble up. When we
  89  * bring its error reporting into line with the rest of the stack,
  90  * these can just be replaced with calls to mlog_errno. */
  91 #define dlm_error(st) do {                                              \
  92         if ((st) != DLM_RECOVERING &&                                   \
  93             (st) != DLM_MIGRATING &&                                    \
  94             (st) != DLM_FORWARD)                                        \
  95                 mlog(ML_ERROR, "dlm status = %s\n", dlm_errname((st))); \
  96 } while (0)
  97
  98 #define DLM_LKSB_UNUSED1           0x01
  99 #define DLM_LKSB_PUT_LVB           0x02
 100 #define DLM_LKSB_GET_LVB           0x04
 101 #define DLM_LKSB_UNUSED2           0x08
 102 #define DLM_LKSB_UNUSED3           0x10
 103 #define DLM_LKSB_UNUSED4           0x20
 104 #define DLM_LKSB_UNUSED5           0x40
 105 #define DLM_LKSB_UNUSED6           0x80
 106
 107 #define DLM_LVB_LEN  64
 108
 109 /* Callers are only allowed access to the lvb and status members of
 110  * this struct. */
 111 struct dlm_lockstatus {
 112         enum dlm_status status;
 113         u32 flags;
 114         struct dlm_lock *lockid;
 115         char lvb[DLM_LVB_LEN];
 116 };
 117
 118 /* Valid lock modes. */
 119 #define LKM_IVMODE      (-1)            /* invalid mode */
 120 #define LKM_NLMODE      0               /* null lock */
 121 #define LKM_CRMODE      1               /* concurrent read    unsupported */
 122 #define LKM_CWMODE      2               /* concurrent write   unsupported */
 123 #define LKM_PRMODE      3               /* protected read */
 124 #define LKM_PWMODE      4               /* protected write    unsupported */
 125 #define LKM_EXMODE      5               /* exclusive */
 126 #define LKM_MAXMODE     5
 127 #define LKM_MODEMASK    0xff
 128
 129 /* Flags passed to dlmlock and dlmunlock:
 130  * reserved: flags used by the "real" dlm
 131  * only a few are supported by this dlm
 132  * (U) = unsupported by ocfs2 dlm */
 133 #define LKM_ORPHAN       0x00000010  /* this lock is orphanable (U) */
 134 #define LKM_PARENTABLE   0x00000020  /* this lock was orphaned (U) */
 135 #define LKM_BLOCK        0x00000040  /* blocking lock request (U) */
 136 #define LKM_LOCAL        0x00000080  /* local lock request */
 137 #define LKM_VALBLK       0x00000100  /* lock value block request */
 138 #define LKM_NOQUEUE      0x00000200  /* non blocking request */
 139 #define LKM_CONVERT      0x00000400  /* conversion request */
 140 #define LKM_NODLCKWT     0x00000800  /* this lock wont deadlock (U) */
 141 #define LKM_UNLOCK       0x00001000  /* deallocate this lock */
 142 #define LKM_CANCEL       0x00002000  /* cancel conversion request */
 143 #define LKM_DEQALL       0x00004000  /* remove all locks held by proc (U) */
 144 #define LKM_INVVALBLK    0x00008000  /* invalidate lock value block */
 145 #define LKM_SYNCSTS      0x00010000  /* return synchronous status if poss (U) */
 146 #define LKM_TIMEOUT      0x00020000  /* lock request contains timeout (U) */
 147 #define LKM_SNGLDLCK     0x00040000  /* request can self-deadlock (U) */
 148 #define LKM_FINDLOCAL    0x00080000  /* find local lock request (U) */
 149 #define LKM_PROC_OWNED   0x00100000  /* owned by process, not group (U) */
 150 #define LKM_XID          0x00200000  /* use transaction id for deadlock (U) */
 151 #define LKM_XID_CONFLICT 0x00400000  /* do not allow lock inheritance (U) */
 152 #define LKM_FORCE        0x00800000  /* force unlock flag */
 153 #define LKM_REVVALBLK    0x01000000  /* temporary solution: re-validate
 154                                         lock value block (U) */
 155 /* unused */
 156 #define LKM_UNUSED1      0x00000001  /* unused */
 157 #define LKM_UNUSED2      0x00000002  /* unused */
 158 #define LKM_UNUSED3      0x00000004  /* unused */
 159 #define LKM_UNUSED4      0x00000008  /* unused */
 160 #define LKM_UNUSED5      0x02000000  /* unused */
 161 #define LKM_UNUSED6      0x04000000  /* unused */
 162 #define LKM_UNUSED7      0x08000000  /* unused */
 163
 164 /* ocfs2 extensions: internal only
 165  * should never be used by caller */
 166 #define LKM_MIGRATION    0x10000000  /* extension: lockres is to be migrated
 167                                         to another node */
 168 #define LKM_PUT_LVB      0x20000000  /* extension: lvb is being passed
 169                                         should be applied to lockres */
 170 #define LKM_GET_LVB      0x40000000  /* extension: lvb should be copied
 171                                         from lockres when lock is granted */
 172 #define LKM_RECOVERY     0x80000000  /* extension: flag for recovery lock
 173                                         used to avoid recovery rwsem */
 174
 175
 176 typedef void (dlm_astlockfunc_t)(void *);
 177 typedef void (dlm_bastlockfunc_t)(void *, int);
 178 typedef void (dlm_astunlockfunc_t)(void *, enum dlm_status);
 179
 180 enum dlm_status dlmlock(struct dlm_ctxt *dlm,
 181                         int mode,
 182                         struct dlm_lockstatus *lksb,
 183                         int flags,
 184                         const char *name,
 185                         int namelen,
 186                         dlm_astlockfunc_t *ast,
 187                         void *data,
 188                         dlm_bastlockfunc_t *bast);
 189
 190 enum dlm_status dlmunlock(struct dlm_ctxt *dlm,
 191                           struct dlm_lockstatus *lksb,
 192                           int flags,
 193                           dlm_astunlockfunc_t *unlockast,
 194                           void *data);
 195
 196 struct dlm_protocol_version {
 197         u8 pv_major;
 198         u8 pv_minor;
 199 };
 200 struct dlm_ctxt * dlm_register_domain(const char *domain, u32 key,
 201                                       struct dlm_protocol_version *fs_proto);
 202
 203 void dlm_unregister_domain(struct dlm_ctxt *dlm);
 204
 205 void dlm_print_one_lock(struct dlm_lock *lockid);
 206
 207 typedef void (dlm_eviction_func)(int, void *);
 208 struct dlm_eviction_cb {
 209         struct list_head        ec_item;
 210         dlm_eviction_func       *ec_func;
 211         void                    *ec_data;
 212 };
 213 void dlm_setup_eviction_cb(struct dlm_eviction_cb *cb,
 214                            dlm_eviction_func *f,
 215                            void *data);
 216 void dlm_register_eviction_cb(struct dlm_ctxt *dlm,
 217                               struct dlm_eviction_cb *cb);
 218 void dlm_unregister_eviction_cb(struct dlm_eviction_cb *cb);
 219
 220 #endif /* DLMAPI_H */