root/fs/ocfs2/ocfs2_lockid.h

INCLUDED FROM

DEFINITIONS

1. ocfs2_lock_type_char
2. ocfs2_lock_type_string

/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 * ocfs2_lockid.h
 *
 * Defines OCFS2 lockid bits.
 *
 * Copyright (C) 2002, 2005 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#ifndef OCFS2_LOCKID_H
#define OCFS2_LOCKID_H

/* lock ids are made up in the following manner:
 * name[0]     --> type
 * name[1-6]   --> 6 pad characters, reserved for now
 * name[7-22]  --> block number, expressed in hex as 16 chars
 * name[23-30] --> i_generation, expressed in hex 8 chars
 * name[31]    --> '\0' */
#define OCFS2_LOCK_ID_MAX_LEN  32
#define OCFS2_LOCK_ID_PAD "000000"

#define OCFS2_DENTRY_LOCK_INO_START 18

enum ocfs2_lock_type {
        OCFS2_LOCK_TYPE_META = 0,
        OCFS2_LOCK_TYPE_DATA,
        OCFS2_LOCK_TYPE_SUPER,
        OCFS2_LOCK_TYPE_RENAME,
        OCFS2_LOCK_TYPE_RW,
        OCFS2_LOCK_TYPE_DENTRY,
        OCFS2_LOCK_TYPE_OPEN,
        OCFS2_LOCK_TYPE_FLOCK,
        OCFS2_NUM_LOCK_TYPES
};

static inline char ocfs2_lock_type_char(enum ocfs2_lock_type type)
{
        char c;
        switch (type) {
                case OCFS2_LOCK_TYPE_META:
                        c = 'M';
                        break;
                case OCFS2_LOCK_TYPE_DATA:
                        c = 'D';
                        break;
                case OCFS2_LOCK_TYPE_SUPER:
                        c = 'S';
                        break;
                case OCFS2_LOCK_TYPE_RENAME:
                        c = 'R';
                        break;
                case OCFS2_LOCK_TYPE_RW:
                        c = 'W';
                        break;
                case OCFS2_LOCK_TYPE_DENTRY:
                        c = 'N';
                        break;
                case OCFS2_LOCK_TYPE_OPEN:
                        c = 'O';
                        break;
                case OCFS2_LOCK_TYPE_FLOCK:
                        c = 'F';
                        break;
                default:
                        c = '\0';
        }

        return c;
}

static char *ocfs2_lock_type_strings[] = {
        [OCFS2_LOCK_TYPE_META] = "Meta",
        [OCFS2_LOCK_TYPE_DATA] = "Data",
        [OCFS2_LOCK_TYPE_SUPER] = "Super",
        [OCFS2_LOCK_TYPE_RENAME] = "Rename",
        /* Need to differntiate from [R]ename.. serializing writes is the
         * important job it does, anyway. */
        [OCFS2_LOCK_TYPE_RW] = "Write/Read",
        [OCFS2_LOCK_TYPE_DENTRY] = "Dentry",
        [OCFS2_LOCK_TYPE_OPEN] = "Open",
        [OCFS2_LOCK_TYPE_FLOCK] = "Flock",
};

static inline const char *ocfs2_lock_type_string(enum ocfs2_lock_type type)
{
#ifdef __KERNEL__
        BUG_ON(type >= OCFS2_NUM_LOCK_TYPES);
#endif
        return ocfs2_lock_type_strings[type];
}

#endif  /* OCFS2_LOCKID_H */