blob: af7e888ad331e65b55089db9008a0aebb35f434d (
plain)
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
|
#ifndef QPID_LEGACYSTORE_JRNL_FILE_HDR_H
#define QPID_LEGACYSTORE_JRNL_FILE_HDR_H
/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
/**
* \file file_hdr.h
*
* Qpid asynchronous store plugin library
*
* File containing code for class mrg::journal::file_hdr (file
* record header), used to start a journal file. It contains some
* file metadata and information to aid journal recovery.
*
* \author Kim van der Riet
*/
#include <time.h>
#include "rec_hdr.h"
#pragma pack(1)
/**
* \brief Struct for data common to the head of all journal files. In addition to
* the common data, this includes the record ID and offset of the first record in
* the file.
*
* This header precedes all data in journal files and occupies the first complete
* block in the file. The record ID and offset are updated on each overwrite of the
* file.
*
* File header info in binary format (48 bytes):
* <pre>
* 0 7
* +---+---+---+---+---+---+---+---+ -+
* | magic | v | 0 | flags | |
* +---+---+---+---+---+---+---+---+ | struct hdr
* | first rid in file | |
* +---+---+---+---+---+---+---+---+ -+
* | fro |
* +---+---+---+---+---+---+---+---+
* | timestamp (sec) |
* +---+---+---+---+---+---+---+---+
* | timestamp (ns) |
* +---+---+---+---+---+---+---+---+
* | file-count | reserved |
* +---+---+---+---+---+---+---+---+
* | file-size |
* +---+---+---+---+---+---+---+---+
* | file-number |
* +---+---+---+---+---+---+---+---+
* | n-len | File Name... |
* +-------+ |
* | |
* +---+---+---+---+---+---+---+---+
*
* v = file version (If the format or encoding of this file changes, then this
* number should be incremented)
* fro = First record offset, offset from start of file to first record header
* file-count = Number of files in use for the journal at the time this header is written
* file-size = Size of the file in octets
* file-number = Incrementing serial number indicating file order within a journal
* n-len = Length of the queue name in octets.
* </pre>
*
* Note that journal files should be transferable between 32- and 64-bit
* hardware of the same endianness, but not between hardware of opposite
* entianness without some sort of binary conversion utility. Thus buffering
* will be needed for types that change size between 32- and 64-bit compiles.
*/
typedef struct file_hdr_t {
rec_hdr_t _rhdr;
uint64_t _fro;
uint64_t _ts_sec;
uint64_t _ts_nsec;
uint32_t _file_count;
uint32_t _reserved;
uint64_t _file_size;
uint64_t _file_number;
uint16_t _name_length;
} file_hdr_t;
int set_time_now(file_hdr_t *fh);
void set_time(file_hdr_t *fh, struct timespec *ts);
#pragma pack()
#endif // ifndef QPID_LEGACYSTORE_JRNL_FILE_HDR_H
|
