| Jorgen Lundman | 4d3c95f | 2012-07-19 20:48:25 +0000 | [diff] [blame] | 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 */ |