Mercurial > illumos > illumos-gate
view usr/src/grub/grub-0.95/stage2/zfs-include/zap_impl.h @ 3912:f6891a60bd72
PSARC 2007/083 ZFS bootable datasets
4929890 ZFS Boot support for the x86 platform
6479807 pools need properties
6531774 reserve bits in directory entry for file type
author | lling |
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date | Wed, 28 Mar 2007 12:48:13 -0700 |
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/* * GRUB -- GRand Unified Bootloader * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ /* * Copyright 2007 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #ifndef _SYS_ZAP_IMPL_H #define _SYS_ZAP_IMPL_H #pragma ident "%Z%%M% %I% %E% SMI" #define ZAP_MAGIC 0x2F52AB2ABULL #define ZAP_HASHBITS 28 #define MZAP_ENT_LEN 64 #define MZAP_NAME_LEN (MZAP_ENT_LEN - 8 - 4 - 2) #define MZAP_MAX_BLKSHIFT SPA_MAXBLOCKSHIFT #define MZAP_MAX_BLKSZ (1 << MZAP_MAX_BLKSHIFT) typedef struct mzap_ent_phys { uint64_t mze_value; uint32_t mze_cd; uint16_t mze_pad; /* in case we want to chain them someday */ char mze_name[MZAP_NAME_LEN]; } mzap_ent_phys_t; typedef struct mzap_phys { uint64_t mz_block_type; /* ZBT_MICRO */ uint64_t mz_salt; uint64_t mz_pad[6]; mzap_ent_phys_t mz_chunk[1]; /* actually variable size depending on block size */ } mzap_phys_t; /* * The (fat) zap is stored in one object. It is an array of * 1<<FZAP_BLOCK_SHIFT byte blocks. The layout looks like one of: * * ptrtbl fits in first block: * [zap_phys_t zap_ptrtbl_shift < 6] [zap_leaf_t] ... * * ptrtbl too big for first block: * [zap_phys_t zap_ptrtbl_shift >= 6] [zap_leaf_t] [ptrtbl] ... * */ #define ZBT_LEAF ((1ULL << 63) + 0) #define ZBT_HEADER ((1ULL << 63) + 1) #define ZBT_MICRO ((1ULL << 63) + 3) /* any other values are ptrtbl blocks */ /* * the embedded pointer table takes up half a block: * block size / entry size (2^3) / 2 */ #define ZAP_EMBEDDED_PTRTBL_SHIFT(zap) (FZAP_BLOCK_SHIFT(zap) - 3 - 1) /* * The embedded pointer table starts half-way through the block. Since * the pointer table itself is half the block, it starts at (64-bit) * word number (1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap)). */ #define ZAP_EMBEDDED_PTRTBL_ENT(zap, idx) \ ((uint64_t *)(zap)->zap_f.zap_phys) \ [(idx) + (1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap))] /* * TAKE NOTE: * If zap_phys_t is modified, zap_byteswap() must be modified. */ typedef struct zap_phys { uint64_t zap_block_type; /* ZBT_HEADER */ uint64_t zap_magic; /* ZAP_MAGIC */ struct zap_table_phys { uint64_t zt_blk; /* starting block number */ uint64_t zt_numblks; /* number of blocks */ uint64_t zt_shift; /* bits to index it */ uint64_t zt_nextblk; /* next (larger) copy start block */ uint64_t zt_blks_copied; /* number source blocks copied */ } zap_ptrtbl; uint64_t zap_freeblk; /* the next free block */ uint64_t zap_num_leafs; /* number of leafs */ uint64_t zap_num_entries; /* number of entries */ uint64_t zap_salt; /* salt to stir into hash function */ /* * This structure is followed by padding, and then the embedded * pointer table. The embedded pointer table takes up second * half of the block. It is accessed using the * ZAP_EMBEDDED_PTRTBL_ENT() macro. */ } zap_phys_t; #endif /* _SYS_ZAP_IMPL_H */