| 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 (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. |
| 21 | */ |
| 22 | |
| 23 | #ifndef _ZIO_H |
| 24 | #define _ZIO_H |
| 25 | |
| 26 | #include <zfs/spa.h> |
| 27 | |
| 28 | #define ZEC_MAGIC 0x210da7ab10c7a11ULL /* zio data bloc tail */ |
| 29 | |
| 30 | typedef struct zio_eck { |
| 31 | uint64_t zec_magic; /* for validation, endianness */ |
| 32 | zio_cksum_t zec_cksum; /* 256-bit checksum */ |
| 33 | } zio_eck_t; |
| 34 | |
| 35 | /* |
| 36 | * Gang block headers are self-checksumming and contain an array |
| 37 | * of block pointers. |
| 38 | */ |
| 39 | #define SPA_GANGBLOCKSIZE SPA_MINBLOCKSIZE |
| 40 | #define SPA_GBH_NBLKPTRS ((SPA_GANGBLOCKSIZE - \ |
| 41 | sizeof(zio_eck_t)) / sizeof(blkptr_t)) |
| 42 | #define SPA_GBH_FILLER ((SPA_GANGBLOCKSIZE - \ |
| 43 | sizeof(zio_eck_t) - \ |
| 44 | (SPA_GBH_NBLKPTRS * sizeof(blkptr_t))) /\ |
| 45 | sizeof(uint64_t)) |
| 46 | |
| 47 | #define ZIO_GET_IOSIZE(zio) \ |
| 48 | (BP_IS_GANG((zio)->io_bp) ? \ |
| 49 | SPA_GANGBLOCKSIZE : BP_GET_PSIZE((zio)->io_bp)) |
| 50 | |
| 51 | typedef struct zio_gbh { |
| 52 | blkptr_t zg_blkptr[SPA_GBH_NBLKPTRS]; |
| 53 | uint64_t zg_filler[SPA_GBH_FILLER]; |
| 54 | zio_eck_t zg_tail; |
| 55 | } zio_gbh_phys_t; |
| 56 | |
| 57 | enum zio_checksum { |
| 58 | ZIO_CHECKSUM_INHERIT = 0, |
| 59 | ZIO_CHECKSUM_ON, |
| 60 | ZIO_CHECKSUM_OFF, |
| 61 | ZIO_CHECKSUM_LABEL, |
| 62 | ZIO_CHECKSUM_GANG_HEADER, |
| 63 | ZIO_CHECKSUM_ZILOG, |
| 64 | ZIO_CHECKSUM_FLETCHER_2, |
| 65 | ZIO_CHECKSUM_FLETCHER_4, |
| 66 | ZIO_CHECKSUM_SHA256, |
| 67 | ZIO_CHECKSUM_ZILOG2, |
| 68 | ZIO_CHECKSUM_FUNCTIONS |
| 69 | }; |
| 70 | |
| 71 | #define ZIO_CHECKSUM_ON_VALUE ZIO_CHECKSUM_FLETCHER_2 |
| 72 | #define ZIO_CHECKSUM_DEFAULT ZIO_CHECKSUM_ON |
| 73 | |
| 74 | enum zio_compress { |
| 75 | ZIO_COMPRESS_INHERIT = 0, |
| 76 | ZIO_COMPRESS_ON, |
| 77 | ZIO_COMPRESS_OFF, |
| 78 | ZIO_COMPRESS_LZJB, |
| 79 | ZIO_COMPRESS_EMPTY, |
| 80 | ZIO_COMPRESS_GZIP1, |
| 81 | ZIO_COMPRESS_GZIP2, |
| 82 | ZIO_COMPRESS_GZIP3, |
| 83 | ZIO_COMPRESS_GZIP4, |
| 84 | ZIO_COMPRESS_GZIP5, |
| 85 | ZIO_COMPRESS_GZIP6, |
| 86 | ZIO_COMPRESS_GZIP7, |
| 87 | ZIO_COMPRESS_GZIP8, |
| 88 | ZIO_COMPRESS_GZIP9, |
| 89 | ZIO_COMPRESS_FUNCTIONS |
| 90 | }; |
| 91 | |
| 92 | #endif /* _ZIO_H */ |