fs/ocfs2/ocfs2_lockid.h

   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_NUM_LOCK_TYPES
  48 };
  49
  50 static inline char ocfs2_lock_type_char(enum ocfs2_lock_type type)
  51 {
  52         char c;
  53         switch (type) {
  54                 case OCFS2_LOCK_TYPE_META:
  55                         c = 'M';
  56                         break;
  57                 case OCFS2_LOCK_TYPE_DATA:
  58                         c = 'D';
  59                         break;
  60                 case OCFS2_LOCK_TYPE_SUPER:
  61                         c = 'S';
  62                         break;
  63                 case OCFS2_LOCK_TYPE_RENAME:
  64                         c = 'R';
  65                         break;
  66                 case OCFS2_LOCK_TYPE_RW:
  67                         c = 'W';
  68                         break;
  69                 case OCFS2_LOCK_TYPE_DENTRY:
  70                         c = 'N';
  71                         break;
  72                 default:
  73                         c = '\0';
  74         }
  75
  76         return c;
  77 }
  78
  79 static char *ocfs2_lock_type_strings[] = {
  80         [OCFS2_LOCK_TYPE_META] = "Meta",
  81         [OCFS2_LOCK_TYPE_DATA] = "Data",
  82         [OCFS2_LOCK_TYPE_SUPER] = "Super",
  83         [OCFS2_LOCK_TYPE_RENAME] = "Rename",
  84         /* Need to differntiate from [R]ename.. serializing writes is the
  85          * important job it does, anyway. */
  86         [OCFS2_LOCK_TYPE_RW] = "Write/Read",
  87         [OCFS2_LOCK_TYPE_DENTRY] = "Dentry",
  88 };
  89
  90 static inline const char *ocfs2_lock_type_string(enum ocfs2_lock_type type)
  91 {
  92 #ifdef __KERNEL__
  93         mlog_bug_on_msg(type >= OCFS2_NUM_LOCK_TYPES, "%d\n", type);
  94 #endif
  95         return ocfs2_lock_type_strings[type];
  96 }
  97
  98 #endif  /* OCFS2_LOCKID_H */