usr/src/grub/grub-0.97/stage2/zfs-include/zil.h

   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, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19 /*
  20  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  21  * Use is subject to license terms.
  22  */
  23
  24 #ifndef _SYS_ZIL_H
  25 #define _SYS_ZIL_H
  26
  27 /*
  28  * Intent log format:
  29  *
  30  * Each objset has its own intent log.  The log header (zil_header_t)
  31  * for objset N's intent log is kept in the Nth object of the SPA's
  32  * intent_log objset.  The log header points to a chain of log blocks,
  33  * each of which contains log records (i.e., transactions) followed by
  34  * a log block trailer (zil_trailer_t).  The format of a log record
  35  * depends on the record (or transaction) type, but all records begin
  36  * with a common structure that defines the type, length, and txg.
  37  */
  38
  39 /*
  40  * Intent log header - this on disk structure holds fields to manage
  41  * the log.  All fields are 64 bit to easily handle cross architectures.
  42  */
  43 typedef struct zil_header {
  44         uint64_t zh_claim_txg;  /* txg in which log blocks were claimed */
  45         uint64_t zh_replay_seq; /* highest replayed sequence number */
  46         blkptr_t zh_log;        /* log chain */
  47         uint64_t zh_claim_seq;  /* highest claimed sequence number */
  48         uint64_t zh_flags;      /* header flags */
  49         uint64_t zh_pad[4];
  50 } zil_header_t;
  51
  52 /*
  53  * zh_flags bit settings
  54  */
  55 #define ZIL_REPLAY_NEEDED 0x1   /* replay needed - internal only */
  56
  57 #endif  /* _SYS_ZIL_H */