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 */ 43 typedef 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