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, see <http://www.gnu.org/licenses/>. 17 */ 18 /* 19 * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 20 * Use is subject to license terms. 21 */ 22 23 #ifndef _ZIO_H 24 #define _ZIO_H 25 26 #define ZEC_MAGIC 0x210da7ab10c7a11ULL /* zio data bloc tail */ 27 28 typedef struct zio_eck { 29 uint64_t zec_magic; /* for validation, endianness */ 30 zio_cksum_t zec_cksum; /* 256-bit checksum */ 31 } zio_eck_t; 32 33 /* 34 * Gang block headers are self-checksumming and contain an array 35 * of block pointers. 36 */ 37 #define SPA_GANGBLOCKSIZE SPA_MINBLOCKSIZE 38 #define SPA_GBH_NBLKPTRS ((SPA_GANGBLOCKSIZE - \ 39 sizeof (zio_eck_t)) / sizeof (blkptr_t)) 40 #define SPA_GBH_FILLER ((SPA_GANGBLOCKSIZE - \ 41 sizeof (zio_eck_t) - \ 42 (SPA_GBH_NBLKPTRS * sizeof (blkptr_t))) /\ 43 sizeof (uint64_t)) 44 45 #define ZIO_GET_IOSIZE(zio) \ 46 (BP_IS_GANG((zio)->io_bp) ? \ 47 SPA_GANGBLOCKSIZE : BP_GET_PSIZE((zio)->io_bp)) 48 49 typedef struct zio_gbh { 50 blkptr_t zg_blkptr[SPA_GBH_NBLKPTRS]; 51 uint64_t zg_filler[SPA_GBH_FILLER]; 52 zio_eck_t zg_tail; 53 } zio_gbh_phys_t; 54 55 enum zio_checksum { 56 ZIO_CHECKSUM_INHERIT = 0, 57 ZIO_CHECKSUM_ON, 58 ZIO_CHECKSUM_OFF, 59 ZIO_CHECKSUM_LABEL, 60 ZIO_CHECKSUM_GANG_HEADER, 61 ZIO_CHECKSUM_ZILOG, 62 ZIO_CHECKSUM_FLETCHER_2, 63 ZIO_CHECKSUM_FLETCHER_4, 64 ZIO_CHECKSUM_SHA256, 65 ZIO_CHECKSUM_ZILOG2, 66 ZIO_CHECKSUM_FUNCTIONS 67 }; 68 69 enum zio_compress { 70 ZIO_COMPRESS_INHERIT = 0, 71 ZIO_COMPRESS_ON, 72 ZIO_COMPRESS_OFF, 73 ZIO_COMPRESS_LZJB, 74 ZIO_COMPRESS_EMPTY, 75 ZIO_COMPRESS_FUNCTIONS 76 }; 77 78 #endif /* _ZIO_H */ 79