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_LOCK_TYPE_QINFO, 50 OCFS2_NUM_LOCK_TYPES 51 }; 52 53 static inline char ocfs2_lock_type_char(enum ocfs2_lock_type type) 54 { 55 char c; 56 switch (type) { 57 case OCFS2_LOCK_TYPE_META: 58 c = 'M'; 59 break; 60 case OCFS2_LOCK_TYPE_DATA: 61 c = 'D'; 62 break; 63 case OCFS2_LOCK_TYPE_SUPER: 64 c = 'S'; 65 break; 66 case OCFS2_LOCK_TYPE_RENAME: 67 c = 'R'; 68 break; 69 case OCFS2_LOCK_TYPE_RW: 70 c = 'W'; 71 break; 72 case OCFS2_LOCK_TYPE_DENTRY: 73 c = 'N'; 74 break; 75 case OCFS2_LOCK_TYPE_OPEN: 76 c = 'O'; 77 break; 78 case OCFS2_LOCK_TYPE_FLOCK: 79 c = 'F'; 80 break; 81 case OCFS2_LOCK_TYPE_QINFO: 82 c = 'Q'; 83 break; 84 default: 85 c = '\0'; 86 } 87 88 return c; 89 } 90 91 static char *ocfs2_lock_type_strings[] = { 92 [OCFS2_LOCK_TYPE_META] = "Meta", 93 [OCFS2_LOCK_TYPE_DATA] = "Data", 94 [OCFS2_LOCK_TYPE_SUPER] = "Super", 95 [OCFS2_LOCK_TYPE_RENAME] = "Rename", 96 /* Need to differntiate from [R]ename.. serializing writes is the 97 * important job it does, anyway. */ 98 [OCFS2_LOCK_TYPE_RW] = "Write/Read", 99 [OCFS2_LOCK_TYPE_DENTRY] = "Dentry", 100 [OCFS2_LOCK_TYPE_OPEN] = "Open", 101 [OCFS2_LOCK_TYPE_FLOCK] = "Flock", 102 [OCFS2_LOCK_TYPE_QINFO] = "Quota", 103 }; 104 105 static inline const char *ocfs2_lock_type_string(enum ocfs2_lock_type type) 106 { 107 #ifdef __KERNEL__ 108 BUG_ON(type >= OCFS2_NUM_LOCK_TYPES); 109 #endif 110 return ocfs2_lock_type_strings[type]; 111 } 112 113 #endif /* OCFS2_LOCKID_H */ 114