summaryrefslogtreecommitdiffstats
path: root/src/fuse/cowfile.h
blob: c74ab9910b79bf816dd7b46c651696836b99ab1e (plain) (blame)
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
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
#ifndef _COWFILE_H_
#define _COWFILE_H_

#include <stdint.h>
#include <stdlib.h>
#include <stdatomic.h>
#include <dnbd3/shared/log.h>
#include <sys/mman.h>
#include <string.h>
#include <pthread.h>
#include <errno.h>
#include <curl/curl.h>
#include "main.h"
#include "connection.h"


#define COW_METADATA_STORAGE_CAPACITY ( COW_BITFIELD_SIZE * 8 * DNBD3_BLOCK_SIZE )
#define COW_L2_SIZE 1024
#define COW_L2_STORAGE_CAPACITY ( COW_L2_SIZE * COW_METADATA_STORAGE_CAPACITY )
#define container_of( ptr, type, member ) ( (type *)( (char *)( ptr ) - (char *)&( ( (type *)NULL )->member ) ) )

_Static_assert( ATOMIC_INT_LOCK_FREE == 2, "ATOMIC INT not lock free" );
_Static_assert( ATOMIC_LONG_LOCK_FREE == 2, "ATOMIC LONG not lock free" );
_Static_assert( ATOMIC_LLONG_LOCK_FREE == 2, "ATOMIC LLONG not lock free" );
_Static_assert( sizeof( atomic_uint_least64_t ) == 8, "atomic_uint_least64_t not 8 byte" );
_Static_assert( sizeof( atomic_int_least64_t ) == 8, "atomic_int_least64_t not 8 byte" );

enum dataSource
{
	local,
	remote,
	zero
};

#define COW_METADATA_HEADER_SIZE 320
typedef struct cowfile_metadata_header
{
	uint64_t magicValue;                    // 8byte
	atomic_uint_least64_t imageSize;        // 8byte
	int32_t version;                        // 4byte
	int32_t blocksize;                      // 4byte
	uint64_t originalImageSize;             // 8byte
	uint64_t metaDataStart;                 // 8byte
	int32_t bitfieldSize;                   // 4byte
	int32_t nextL2;                         // 4byte
	atomic_uint_least64_t metadataFileSize; // 8byte
	atomic_uint_least64_t dataFileSize;     // 8byte
	uint64_t maxImageSize;                  // 8byte
	uint64_t creationTime;                  // 8byte
	char uuid[40];                          // 40byte
	char imageName[200];                    // 200byte
} cowfile_metadata_header_t;
_Static_assert(
		sizeof( cowfile_metadata_header_t ) == COW_METADATA_HEADER_SIZE, "cowfile_metadata_header is messed up" );

#define COW_METADATA_METADATA_SIZE 64
typedef struct cow_block_metadata
{
	atomic_int_least64_t offset;
	atomic_uint_least64_t timeChanged;
	atomic_uint_least64_t uploads;
	atomic_char bitfield[40];
} cow_block_metadata_t;
_Static_assert( sizeof( cow_block_metadata_t ) == COW_METADATA_METADATA_SIZE, "cow_block_metadata_t is messed up" );


typedef struct cow_request
{
	size_t fuseRequestSize;
	off_t fuseRequestOffset;
	char *readBuffer;
	const char *writeBuffer;
	atomic_size_t bytesWorkedOn;
	atomic_int workCounter;
	atomic_int errorCode;
	fuse_ino_t ino;
	struct fuse_file_info *fi;
} cow_request_t;

typedef struct cow_sub_request cow_sub_request_t;
typedef void ( *cow_callback )( cow_sub_request_t *sRequest );

typedef struct cow_sub_request
{
	size_t size;
	off_t inBlockOffset;
	const char *writeSrc;
	char *buffer;
	cow_block_metadata_t *block;
	cow_callback callback;
	cow_request_t *cowRequest;
	dnbd3_async_t dRequest;
	char writeBuffer[];
} cow_sub_request_t;

typedef struct cow_curl_read_upload
{
	atomic_uint_least64_t time;
	cow_block_metadata_t *block;
	size_t position;
	long unsigned int blocknumber;
	int fails;
	curl_off_t ulLast;
} cow_curl_read_upload_t;


typedef struct cow_block_upload_statistics
{
	uint64_t blocknumber;
	uint64_t uploads;
} cow_block_upload_statistics_t;


typedef int32_t l1;
typedef cow_block_metadata_t l2[COW_L2_SIZE];

bool cowfile_init( char *path, const char *image_Name, uint16_t imageVersion, atomic_uint_fast64_t **imageSizePtr,
		char *serverAddress, bool sStdout, bool sFile );

bool cowfile_load( char *path, atomic_uint_fast64_t **imageSizePtr, char *serverAddress, bool sStdout, bool sFile );

void cowfile_read( fuse_req_t req, size_t size, off_t offset );

void cowfile_write( fuse_req_t req, cow_request_t *cowRequest, off_t offset, size_t size );

void cowfile_handleCallback( dnbd3_async_t *request );

void cowfile_setSize( fuse_req_t req, size_t size, fuse_ino_t ino, struct fuse_file_info *fi );

void readRemoteData( cow_sub_request_t *sRequest );

int cow_printStats( char *buffer, const size_t len );

void cowfile_close();

#endif /* COWFILE_H_ */