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