1*4882a593Smuzhiyun /* 2*4882a593Smuzhiyun * GRUB -- GRand Unified Bootloader 3*4882a593Smuzhiyun * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc. 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+ 6*4882a593Smuzhiyun */ 7*4882a593Smuzhiyun /* 8*4882a593Smuzhiyun * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 9*4882a593Smuzhiyun * Use is subject to license terms. 10*4882a593Smuzhiyun */ 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun #ifndef _SYS_ZIL_H 13*4882a593Smuzhiyun #define _SYS_ZIL_H 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun /* 16*4882a593Smuzhiyun * Intent log format: 17*4882a593Smuzhiyun * 18*4882a593Smuzhiyun * Each objset has its own intent log. The log header (zil_header_t) 19*4882a593Smuzhiyun * for objset N's intent log is kept in the Nth object of the SPA's 20*4882a593Smuzhiyun * intent_log objset. The log header points to a chain of log blocks, 21*4882a593Smuzhiyun * each of which contains log records (i.e., transactions) followed by 22*4882a593Smuzhiyun * a log block trailer (zil_trailer_t). The format of a log record 23*4882a593Smuzhiyun * depends on the record (or transaction) type, but all records begin 24*4882a593Smuzhiyun * with a common structure that defines the type, length, and txg. 25*4882a593Smuzhiyun */ 26*4882a593Smuzhiyun 27*4882a593Smuzhiyun /* 28*4882a593Smuzhiyun * Intent log header - this on disk structure holds fields to manage 29*4882a593Smuzhiyun * the log. All fields are 64 bit to easily handle cross architectures. 30*4882a593Smuzhiyun */ 31*4882a593Smuzhiyun typedef struct zil_header { 32*4882a593Smuzhiyun uint64_t zh_claim_txg; /* txg in which log blocks were claimed */ 33*4882a593Smuzhiyun uint64_t zh_replay_seq; /* highest replayed sequence number */ 34*4882a593Smuzhiyun blkptr_t zh_log; /* log chain */ 35*4882a593Smuzhiyun uint64_t zh_claim_seq; /* highest claimed sequence number */ 36*4882a593Smuzhiyun uint64_t zh_flags; /* header flags */ 37*4882a593Smuzhiyun uint64_t zh_pad[4]; 38*4882a593Smuzhiyun } zil_header_t; 39*4882a593Smuzhiyun 40*4882a593Smuzhiyun /* 41*4882a593Smuzhiyun * zh_flags bit settings 42*4882a593Smuzhiyun */ 43*4882a593Smuzhiyun #define ZIL_REPLAY_NEEDED 0x1 /* replay needed - internal only */ 44*4882a593Smuzhiyun 45*4882a593Smuzhiyun #endif /* _SYS_ZIL_H */ 46