chiark / gitweb /
journal: store XOR combination of entry data object hashes to identify hash lines
[elogind.git] / src / journal / journal-def.h
1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
2
3 #ifndef foojournaldefhfoo
4 #define foojournaldefhfoo
5
6 /***
7   This file is part of systemd.
8
9   Copyright 2011 Lennart Poettering
10
11   systemd is free software; you can redistribute it and/or modify it
12   under the terms of the GNU General Public License as published by
13   the Free Software Foundation; either version 2 of the License, or
14   (at your option) any later version.
15
16   systemd is distributed in the hope that it will be useful, but
17   WITHOUT ANY WARRANTY; without even the implied warranty of
18   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19   General Public License for more details.
20
21   You should have received a copy of the GNU General Public License
22   along with systemd; If not, see <http://www.gnu.org/licenses/>.
23 ***/
24
25 #include <inttypes.h>
26
27 #include "macro.h"
28 #include "sd-id128.h"
29
30 typedef struct Header Header;
31 typedef struct ObjectHeader ObjectHeader;
32 typedef union Object Object;
33 typedef struct DataObject DataObject;
34 typedef struct EntryObject EntryObject;
35 typedef struct HashTableObject HashTableObject;
36 typedef struct BisectTableObject BisectTableObject;
37 typedef struct EntryItem EntryItem;
38 typedef struct HashItem HashItem;
39
40 /* Object types */
41 enum {
42         OBJECT_UNUSED,
43         OBJECT_DATA,
44         OBJECT_ENTRY,
45         OBJECT_HASH_TABLE,
46         OBJECT_BISECT_TABLE
47 };
48
49 _packed_ struct ObjectHeader {
50         uint8_t type;
51         uint8_t reserved[3];
52         uint64_t size;
53         uint8_t payload[];
54 };
55
56 _packed_ struct DataObject {
57         ObjectHeader object;
58         uint64_t hash;
59         uint64_t head_entry_offset;
60         uint64_t tail_entry_offset;
61         uint64_t prev_hash_offset;
62         uint64_t next_hash_offset;
63         uint8_t payload[];
64 };
65
66 _packed_ struct EntryItem {
67         uint64_t object_offset;
68         uint64_t prev_entry_offset;
69         uint64_t next_entry_offset;
70 };
71
72 _packed_ struct EntryObject {
73         ObjectHeader object;
74         uint64_t seqnum;
75         uint64_t realtime;
76         uint64_t monotonic;
77         uint64_t xor_hash;
78         uint64_t prev_entry_offset;
79         uint64_t next_entry_offset;
80         EntryItem items[];
81 };
82
83 _packed_ struct HashItem {
84         uint64_t head_hash_offset;
85         uint64_t tail_hash_offset;
86 };
87
88 _packed_ struct HashTableObject {
89         ObjectHeader object;
90         HashItem table[];
91 };
92
93 _packed_ struct BisectTableObject {
94         ObjectHeader object;
95         uint64_t table[];
96 };
97
98 union Object {
99         ObjectHeader object;
100         DataObject data;
101         EntryObject entry;
102         HashTableObject hash_table;
103         BisectTableObject bisect_table;
104 };
105
106 enum {
107         STATE_OFFLINE,
108         STATE_ONLINE,
109         STATE_ARCHIVED
110 };
111
112 _packed_ struct Header {
113         uint8_t signature[8]; /* "LPKSHHRH" */
114         uint32_t compatible_flags;
115         uint32_t incompatible_flags;
116         uint32_t state;
117         uint8_t reserved[4];
118         sd_id128_t file_id;
119         sd_id128_t machine_id;
120         sd_id128_t boot_id;
121         uint64_t arena_offset;
122         uint64_t arena_size;
123         uint64_t arena_max_size;
124         uint64_t arena_min_size;
125         uint64_t arena_keep_free;
126         uint64_t hash_table_offset;     /* for looking up data objects */
127         uint64_t hash_table_size;
128         uint64_t bisect_table_offset;   /* for looking up entry objects */
129         uint64_t bisect_table_size;
130         uint64_t head_object_offset;
131         uint64_t tail_object_offset;
132         uint64_t head_entry_offset;
133         uint64_t tail_entry_offset;
134         uint64_t last_bisect_offset;
135         uint64_t n_objects;
136         uint64_t seqnum_base;
137         uint64_t seqnum;
138 };
139
140 #endif