arch/all-pc/boot/grub2-aros/include/grub/zfs/zil.h

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
   4  *
   5  *  GRUB 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 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18 /*
  19  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  20  * Use is subject to license terms.
  21  */
  22
  23 #ifndef _SYS_ZIL_H
  24 #define _SYS_ZIL_H
  25
  26 /*
  27  * Intent log format:
  28  *
  29  * Each objset has its own intent log.  The log header (zil_header_t)
  30  * for objset N's intent log is kept in the Nth object of the SPA's
  31  * intent_log objset.  The log header points to a chain of log blocks,
  32  * each of which contains log records (i.e., transactions) followed by
  33  * a log block trailer (zil_trailer_t).  The format of a log record
  34  * depends on the record (or transaction) type, but all records begin
  35  * with a common structure that defines the type, length, and txg.
  36  */
  37
  38 /*
  39  * Intent log header - this on disk structure holds fields to manage
  40  * the log.  All fields are 64 bit to easily handle cross architectures.
  41  */
  42 typedef struct zil_header {
  43         grub_uint64_t zh_claim_txg;   /* txg in which log blocks were claimed */
  44         grub_uint64_t zh_replay_seq;  /* highest replayed sequence number */
  45         blkptr_t zh_log;        /* log chain */
  46         grub_uint64_t zh_claim_seq;     /* highest claimed sequence number */
  47         grub_uint64_t zh_flags; /* header flags */
  48         grub_uint64_t zh_pad[4];
  49 } zil_header_t;
  50
  51 /*
  52  * zh_flags bit settings
  53  */
  54 #define ZIL_REPLAY_NEEDED 0x1   /* replay needed - internal only */
  55
  56 #endif  /* _SYS_ZIL_H */