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, see <http://www.gnu.org/licenses/>. 17 */ 18 /* 19 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 20 * Use is subject to license terms. 21 */ 22 23 #ifndef _SYS_ZIL_H 24 #define _SYS_ZIL_H 25 26 /* 27 * Intent log format: 28 * 29 * Each objset has its own intent log. The log header (zil_header_t) 30 * for objset N's intent log is kept in the Nth object of the SPA's 31 * intent_log objset. The log header points to a chain of log blocks, 32 * each of which contains log records (i.e., transactions) followed by 33 * a log block trailer (zil_trailer_t). The format of a log record 34 * depends on the record (or transaction) type, but all records begin 35 * with a common structure that defines the type, length, and txg. 36 */ 37 38 /* 39 * Intent log header - this on disk structure holds fields to manage 40 * the log. All fields are 64 bit to easily handle cross architectures. 41 */ 42 typedef struct zil_header { 43 uint64_t zh_claim_txg; /* txg in which log blocks were claimed */ 44 uint64_t zh_replay_seq; /* highest replayed sequence number */ 45 blkptr_t zh_log; /* log chain */ 46 uint64_t zh_claim_seq; /* highest claimed sequence number */ 47 uint64_t zh_flags; /* header flags */ 48 uint64_t zh_pad[4]; 49 } zil_header_t; 50 51 /* 52 * zh_flags bit settings 53 */ 54 #define ZIL_REPLAY_NEEDED 0x1 /* replay needed - internal only */ 55 56 #endif /* _SYS_ZIL_H */ 57