git://bbs.cooldavid.org / net-next-2.6.git / blame
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|---|---|---|
| ccd979bd MF |
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 | ||
| d680efe9 MF |
38 | #define OCFS2_DENTRY_LOCK_INO_START 18 |
| 39 | ||
| ccd979bd MF |
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, | |
| d680efe9 | 46 | OCFS2_LOCK_TYPE_DENTRY, |
| ccd979bd MF |
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; | |
| d680efe9 MF |
69 | case OCFS2_LOCK_TYPE_DENTRY: |
| 70 | c = 'N'; | |
| 71 | break; | |
| ccd979bd MF |
72 | default: |
| 73 | c = '\0'; | |
| 74 | } | |
| 75 | ||
| 76 | return c; | |
| 77 | } | |
| 78 | ||
| d680efe9 MF |
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 | ||
| ccd979bd | 98 | #endif /* OCFS2_LOCKID_H */ |