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/*
* FUSE: Filesystem in Userspace
* Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu>
* This program can be distributed under the terms of the GNU GPL.
* See the file COPYING.
*
* Changed by Stephan Schwaer
* */
#include "../shared/protocol.h"
#include "../shared/signal.h"
#include "connection.h"
#include "../serialize.h"
#include "helper.h"
#include "../shared/log.h"
#define FUSE_USE_VERSION 30
#include <fuse.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
/* for printing uint */
#define __STDC_FORMAT_MACROS
#include <inttypes.h>
#define debugf(...) do { logadd( LOG_DEBUG1, __VA_ARGS__ ); } while (0)
static const char *imagePathName = "/img";
static uint64_t imageSize;
/* Debug/Benchmark variables */
static bool useDebug = false;
static bool useLog = false;
static log_info logInfo;
void error(const char *msg)
{
perror( msg );
exit( 0 );
}
static int image_getattr(const char *path, struct stat *stbuf)
{
int res = 0;
memset( stbuf, 0, sizeof( struct stat ) );
if ( strcmp( path, "/" ) == 0 ) {
stbuf->st_mode = S_IFDIR | 0444;
stbuf->st_nlink = 2;
} else if ( strcmp( path, imagePathName ) == 0 ) {
stbuf->st_mode = S_IFREG | 0444;
stbuf->st_nlink = 1;
stbuf->st_size = imageSize;
} else {
res = -ENOENT;
}
return res;
}
static int image_readdir(const char *path, void *buf, fuse_fill_dir_t filler, off_t offset UNUSED, struct fuse_file_info *fi UNUSED)
{
if ( strcmp( path, "/" ) != 0 ) {
return -ENOENT;
}
filler( buf, ".", NULL, 0 );
filler( buf, "..", NULL, 0 );
filler( buf, imagePathName + 1, NULL, 0 );
return 0;
}
static int image_open(const char *path, struct fuse_file_info *fi)
{
if ( strcmp( path, imagePathName ) != 0 ) {
return -ENOENT;
}
if ( ( fi->flags & 3 ) != O_RDONLY ) {
return -EACCES;
}
return 0;
}
static int image_read(const char *path, char *buf, size_t size, off_t offset, struct fuse_file_info *fi UNUSED)
{
if ( (uint64_t)offset >= imageSize ) {
return 0;
}
// if ( strcmp( path, imagePathName ) != 0 ) {
// return -ENOENT;
// }
if ( offset + size > imageSize ) {
size = imageSize - offset;
}
/* count the requested blocks */
uint64_t startBlock = offset / ( 4096 );
const uint64_t endBlock = ( offset + size - 1 ) / ( 4096 );
if ( useDebug ) {
for ( ; startBlock <= endBlock; startBlock++ ) {
logInfo.blockRequestCount[startBlock] += 1;
}
}
dnbd3_async_t request;
request.buffer = buf;
request.length = (uint32_t)size;
request.offset = offset;
request.signalFd = signal_newBlocking();
if ( !connection_read( &request ) ) {
return -EINVAL;
}
while ( !request.finished ) {
int ret = signal_wait( request.signalFd, 10000 );
if ( ret < 0 ) {
debugf( "fuse_read signal wait returned %d", ret );
}
}
signal_close( request.signalFd );
if ( request.success ) {
return request.length;
} else {
return -EIO;
}
}
/* close the connection */
void image_destroy(void *private_data UNUSED)
{
if ( useLog ) {
printLog( &logInfo );
}
connection_close();
return;
}
/* map the implemented fuse operations */
static struct fuse_operations image_oper = {
.getattr = image_getattr,
.readdir = image_readdir,
.open = image_open,
.read = image_read,
.destroy = image_destroy,
};
int main(int argc, char *argv[])
{
char *server_address = NULL;
char *image_Name = NULL;
char *mountPoint = NULL;
int opt;
bool testOpt = false;
if ( argc == 1 || strcmp( argv[1], "--help" ) == 0 || strcmp( argv[1], "--usage" ) == 0 ) {
exit_usage:
printf( "Usage: %s [-l] [-d] [-t] -m <mountpoint> -s <serverAdress> -i <imageName>\n", argv[0] );
printf( " -l: creates a logfile log.txt at program path\n" );
printf( " -d: fuse debug mode\n" );
printf( " -t: use hardcoded server, port and image for testing\n" );
exit( EXIT_FAILURE );
}
log_setConsoleMask( 65535 );
while ( ( opt = getopt( argc,argv,"m:s:p:i:tdl" ) ) != -1 ) {
switch ( opt ) {
case 'm':
mountPoint = optarg;
break;
case 's':
server_address = optarg;
break;
case 'i':
image_Name = optarg;
break;
case 't':
testOpt = true;
break;
case 'd':
useDebug = true;
break;
case 'l':
useLog = true;
useDebug = true;
break;
default:
goto exit_usage;
}
}
if ( testOpt ) {
/* values for testing. */
server_address = "132.230.4.1 132.230.8.113 132.230.4.60";
image_Name = "windows7-umwelt.vmdk";
useLog = true;
}
if ( server_address == NULL || image_Name == NULL || mountPoint == NULL ) {
goto exit_usage;
}
int arg_count = 4;
if ( useDebug ) {
arg_count++;
}
char *args[6] = { "foo", "-o", "ro,allow_other,kernel_cache,max_readahead=262144", mountPoint, "-d" };
if ( !connection_init( server_address, image_Name, 0 ) ) {
printf( "Tschüss\n" );
return 1;
}
imageSize = connection_getImageSize();
/* initialize benchmark variables */
logInfo.receivedBytes = 0;
logInfo.imageSize = imageSize;
logInfo.imageBlockCount = ( imageSize + 4095 ) / 4096;
uint8_t tmpShrt[logInfo.imageBlockCount];
memset( tmpShrt, 0, sizeof tmpShrt );
logInfo.blockRequestCount = tmpShrt;
printf( "ImagePathName: %s\n",imagePathName );
return fuse_main( arg_count, args, &image_oper, NULL );
}
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