zil.h
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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _SYS_ZIL_H
#define _SYS_ZIL_H
/*
* Intent log format:
*
* Each objset has its own intent log. The log header (zil_header_t)
* for objset N's intent log is kept in the Nth object of the SPA's
* intent_log objset. The log header points to a chain of log blocks,
* each of which contains log records (i.e., transactions) followed by
* a log block trailer (zil_trailer_t). The format of a log record
* depends on the record (or transaction) type, but all records begin
* with a common structure that defines the type, length, and txg.
*/
/*
* Intent log header - this on disk structure holds fields to manage
* the log. All fields are 64 bit to easily handle cross architectures.
*/
typedef struct zil_header {
uint64_t zh_claim_txg; /* txg in which log blocks were claimed */
uint64_t zh_replay_seq; /* highest replayed sequence number */
blkptr_t zh_log; /* log chain */
uint64_t zh_claim_seq; /* highest claimed sequence number */
uint64_t zh_flags; /* header flags */
uint64_t zh_pad[4];
} zil_header_t;
/*
* zh_flags bit settings
*/
#define ZIL_REPLAY_NEEDED 0x1 /* replay needed - internal only */
#endif /* _SYS_ZIL_H */