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 */ 93