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4d3c95f5 JL |
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 */ |