linux/fs/ocfs2/ocfs2_lockid.h
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   1/* -*- mode: c; c-basic-offset: 8; -*-
   2 * vim: noexpandtab sw=8 ts=8 sts=0:
   3 *
   4 * ocfs2_lockid.h
   5 *
   6 * Defines OCFS2 lockid bits.
   7 *
   8 * Copyright (C) 2002, 2005 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#ifndef OCFS2_LOCKID_H
  27#define OCFS2_LOCKID_H
  28
  29/* lock ids are made up in the following manner:
  30 * name[0]     --> type
  31 * name[1-6]   --> 6 pad characters, reserved for now
  32 * name[7-22]  --> block number, expressed in hex as 16 chars
  33 * name[23-30] --> i_generation, expressed in hex 8 chars
  34 * name[31]    --> '\0' */
  35#define OCFS2_LOCK_ID_MAX_LEN  32
  36#define OCFS2_LOCK_ID_PAD "000000"
  37
  38#define OCFS2_DENTRY_LOCK_INO_START 18
  39
  40enum ocfs2_lock_type {
  41        OCFS2_LOCK_TYPE_META = 0,
  42        OCFS2_LOCK_TYPE_DATA,
  43        OCFS2_LOCK_TYPE_SUPER,
  44        OCFS2_LOCK_TYPE_RENAME,
  45        OCFS2_LOCK_TYPE_RW,
  46        OCFS2_LOCK_TYPE_DENTRY,
  47        OCFS2_LOCK_TYPE_OPEN,
  48        OCFS2_LOCK_TYPE_FLOCK,
  49        OCFS2_LOCK_TYPE_QINFO,
  50        OCFS2_LOCK_TYPE_NFS_SYNC,
  51        OCFS2_LOCK_TYPE_ORPHAN_SCAN,
  52        OCFS2_LOCK_TYPE_REFCOUNT,
  53        OCFS2_NUM_LOCK_TYPES
  54};
  55
  56static inline char ocfs2_lock_type_char(enum ocfs2_lock_type type)
  57{
  58        char c;
  59        switch (type) {
  60                case OCFS2_LOCK_TYPE_META:
  61                        c = 'M';
  62                        break;
  63                case OCFS2_LOCK_TYPE_DATA:
  64                        c = 'D';
  65                        break;
  66                case OCFS2_LOCK_TYPE_SUPER:
  67                        c = 'S';
  68                        break;
  69                case OCFS2_LOCK_TYPE_RENAME:
  70                        c = 'R';
  71                        break;
  72                case OCFS2_LOCK_TYPE_RW:
  73                        c = 'W';
  74                        break;
  75                case OCFS2_LOCK_TYPE_DENTRY:
  76                        c = 'N';
  77                        break;
  78                case OCFS2_LOCK_TYPE_OPEN:
  79                        c = 'O';
  80                        break;
  81                case OCFS2_LOCK_TYPE_FLOCK:
  82                        c = 'F';
  83                        break;
  84                case OCFS2_LOCK_TYPE_QINFO:
  85                        c = 'Q';
  86                        break;
  87                case OCFS2_LOCK_TYPE_NFS_SYNC:
  88                        c = 'Y';
  89                        break;
  90                case OCFS2_LOCK_TYPE_ORPHAN_SCAN:
  91                        c = 'P';
  92                        break;
  93                case OCFS2_LOCK_TYPE_REFCOUNT:
  94                        c = 'T';
  95                        break;
  96                default:
  97                        c = '\0';
  98        }
  99
 100        return c;
 101}
 102
 103static char *ocfs2_lock_type_strings[] = {
 104        [OCFS2_LOCK_TYPE_META] = "Meta",
 105        [OCFS2_LOCK_TYPE_DATA] = "Data",
 106        [OCFS2_LOCK_TYPE_SUPER] = "Super",
 107        [OCFS2_LOCK_TYPE_RENAME] = "Rename",
 108        /* Need to differntiate from [R]ename.. serializing writes is the
 109         * important job it does, anyway. */
 110        [OCFS2_LOCK_TYPE_RW] = "Write/Read",
 111        [OCFS2_LOCK_TYPE_DENTRY] = "Dentry",
 112        [OCFS2_LOCK_TYPE_OPEN] = "Open",
 113        [OCFS2_LOCK_TYPE_FLOCK] = "Flock",
 114        [OCFS2_LOCK_TYPE_QINFO] = "Quota",
 115        [OCFS2_LOCK_TYPE_NFS_SYNC] = "NFSSync",
 116        [OCFS2_LOCK_TYPE_ORPHAN_SCAN] = "OrphanScan",
 117        [OCFS2_LOCK_TYPE_REFCOUNT] = "Refcount",
 118};
 119
 120static inline const char *ocfs2_lock_type_string(enum ocfs2_lock_type type)
 121{
 122#ifdef __KERNEL__
 123        BUG_ON(type >= OCFS2_NUM_LOCK_TYPES);
 124#endif
 125        return ocfs2_lock_type_strings[type];
 126}
 127
 128#endif  /* OCFS2_LOCKID_H */
 129
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