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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
  40 enum 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_NUM_LOCK_TYPES
  50 };
  51
  52 static inline char ocfs2_lock_type_char(enum ocfs2_lock_type type)
  53 {
  54         char c;
  55         switch (type) {
  56                 case OCFS2_LOCK_TYPE_META:
  57                         c = 'M';
  58                         break;
  59                 case OCFS2_LOCK_TYPE_DATA:
  60                         c = 'D';
  61                         break;
  62                 case OCFS2_LOCK_TYPE_SUPER:
  63                         c = 'S';
  64                         break;
  65                 case OCFS2_LOCK_TYPE_RENAME:
  66                         c = 'R';
  67                         break;
  68                 case OCFS2_LOCK_TYPE_RW:
  69                         c = 'W';
  70                         break;
  71                 case OCFS2_LOCK_TYPE_DENTRY:
  72                         c = 'N';
  73                         break;
  74                 case OCFS2_LOCK_TYPE_OPEN:
  75                         c = 'O';
  76                         break;
  77                 case OCFS2_LOCK_TYPE_FLOCK:
  78                         c = 'F';
  79                         break;
  80                 default:
  81                         c = '\0';
  82         }
  83
  84         return c;
  85 }
  86
  87 static char *ocfs2_lock_type_strings[] = {
  88         [OCFS2_LOCK_TYPE_META] = "Meta",
  89         [OCFS2_LOCK_TYPE_DATA] = "Data",
  90         [OCFS2_LOCK_TYPE_SUPER] = "Super",
  91         [OCFS2_LOCK_TYPE_RENAME] = "Rename",
  92         /* Need to differntiate from [R]ename.. serializing writes is the
  93          * important job it does, anyway. */
  94         [OCFS2_LOCK_TYPE_RW] = "Write/Read",
  95         [OCFS2_LOCK_TYPE_DENTRY] = "Dentry",
  96         [OCFS2_LOCK_TYPE_OPEN] = "Open",
  97         [OCFS2_LOCK_TYPE_FLOCK] = "Flock",
  98 };
  99
 100 static inline const char *ocfs2_lock_type_string(enum ocfs2_lock_type type)
 101 {
 102 #ifdef __KERNEL__
 103         BUG_ON(type >= OCFS2_NUM_LOCK_TYPES);
 104 #endif
 105         return ocfs2_lock_type_strings[type];
 106 }
 107
 108 #endif  /* OCFS2_LOCKID_H */