1/*
2 *  GRUB  --  GRand Unified Bootloader
3 *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
4 *
5 *  This program is free software; you can redistribute it and/or modify
6 *  it under the terms of the GNU General Public License as published by
7 *  the Free Software Foundation; either version 2 of the License, or
8 *  (at your option) any later version.
9 *
10 *  This program is distributed in the hope that it will be useful,
11 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
12 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 *  GNU General Public License for more details.
14 *
15 *  You should have received a copy of the GNU General Public License
16 *  along with this program; if not, write to the Free Software
17 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 */
19/*
20 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
21 * Use is subject to license terms.
22 */
23
24#ifndef	_SYS_ZIL_H
25#define	_SYS_ZIL_H
26
27/*
28 * Intent log format:
29 *
30 * Each objset has its own intent log.  The log header (zil_header_t)
31 * for objset N's intent log is kept in the Nth object of the SPA's
32 * intent_log objset.  The log header points to a chain of log blocks,
33 * each of which contains log records (i.e., transactions) followed by
34 * a log block trailer (zil_trailer_t).  The format of a log record
35 * depends on the record (or transaction) type, but all records begin
36 * with a common structure that defines the type, length, and txg.
37 */
38
39/*
40 * Intent log header - this on disk structure holds fields to manage
41 * the log.  All fields are 64 bit to easily handle cross architectures.
42 */
43typedef struct zil_header {
44	uint64_t zh_claim_txg;	/* txg in which log blocks were claimed */
45	uint64_t zh_replay_seq;	/* highest replayed sequence number */
46	blkptr_t zh_log;	/* log chain */
47	uint64_t zh_claim_seq;	/* highest claimed sequence number */
48	uint64_t zh_flags;	/* header flags */
49	uint64_t zh_pad[4];
50} zil_header_t;
51
52/*
53 * zh_flags bit settings
54 */
55#define	ZIL_REPLAY_NEEDED 0x1	/* replay needed - internal only */
56
57#endif	/* _SYS_ZIL_H */
58