1 /* 2 * GRUB -- GRand Unified Bootloader 3 * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc. 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 /* 8 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 9 * Use is subject to license terms. 10 */ 11 12 #ifndef _SYS_ZIL_H 13 #define _SYS_ZIL_H 14 15 /* 16 * Intent log format: 17 * 18 * Each objset has its own intent log. The log header (zil_header_t) 19 * for objset N's intent log is kept in the Nth object of the SPA's 20 * intent_log objset. The log header points to a chain of log blocks, 21 * each of which contains log records (i.e., transactions) followed by 22 * a log block trailer (zil_trailer_t). The format of a log record 23 * depends on the record (or transaction) type, but all records begin 24 * with a common structure that defines the type, length, and txg. 25 */ 26 27 /* 28 * Intent log header - this on disk structure holds fields to manage 29 * the log. All fields are 64 bit to easily handle cross architectures. 30 */ 31 typedef struct zil_header { 32 uint64_t zh_claim_txg; /* txg in which log blocks were claimed */ 33 uint64_t zh_replay_seq; /* highest replayed sequence number */ 34 blkptr_t zh_log; /* log chain */ 35 uint64_t zh_claim_seq; /* highest claimed sequence number */ 36 uint64_t zh_flags; /* header flags */ 37 uint64_t zh_pad[4]; 38 } zil_header_t; 39 40 /* 41 * zh_flags bit settings 42 */ 43 #define ZIL_REPLAY_NEEDED 0x1 /* replay needed - internal only */ 44 45 #endif /* _SYS_ZIL_H */ 46