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 */ 109