1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
/*
* 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 (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved.
*/
#ifndef _SYS_ZAP_IMPL_H
#define _SYS_ZAP_IMPL_H
#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 */
uint64_t zap_normflags; /* flags for u8_textprep_str() */
uint64_t zap_flags; /* zap_flag_t */
/*
* 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 */
|
