[mirror_ubuntu-artful-kernel.git] / fs / ocfs2 / ocfs2_lockid.h

/* -*- 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"

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_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;
		default:
			c = '\0';
	}

	return c;
}

#endif  /* OCFS2_LOCKID_H */
Commit	Line	Data
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
	38	enum ocfs2_lock_type {
	39	OCFS2_LOCK_TYPE_META = 0,
	40	OCFS2_LOCK_TYPE_DATA,
	41	OCFS2_LOCK_TYPE_SUPER,
	42	OCFS2_LOCK_TYPE_RENAME,
	43	OCFS2_LOCK_TYPE_RW,
	44	OCFS2_NUM_LOCK_TYPES
	45	};
	46
	47	static inline char ocfs2_lock_type_char(enum ocfs2_lock_type type)
	48	{
	49	char c;
	50	switch (type) {
	51	case OCFS2_LOCK_TYPE_META:
	52	c = 'M';
	53	break;
	54	case OCFS2_LOCK_TYPE_DATA:
	55	c = 'D';
	56	break;
	57	case OCFS2_LOCK_TYPE_SUPER:
	58	c = 'S';
	59	break;
	60	case OCFS2_LOCK_TYPE_RENAME:
	61	c = 'R';
	62	break;
	63	case OCFS2_LOCK_TYPE_RW:
	64	c = 'W';
65	break;
66	default:
67	c = '\0';
68	}
69
70	return c;
71	}
72
73	#endif /* OCFS2_LOCKID_H */