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nosparse.cpp( for preventing VMware .vmem fragmentation )
Download source: nosparse.cpp
Download binary: nosparse.so
/*******
--About nosparse.cpp--
Preventing fragmentation of ".vmem" file of VMware Server 1.0.x on Linux(32 or 64bit)
Generating .vmem file as a normal file, not as a sparse file.
This code is based on the "hook_tcp.cpp" by Yoggy(http://www.t-dori.net/?hook_tcp.so)
Special thanx to Yoggy and Team t-dori!
--How to use--
Compile:
***!! you need to compile this code on the 32 bit Linux box !!***
g++ -Wall -fPIC -shared -o nosparse.so nosparse.cpp -ldl
Run:
example_shell> LD_PRELOAD=/root/vmware/nosparse.so /usr/lib/vmware/bin/vmware-vmx -x -C /vmware/Linux/Linux.vmx -@ \"\" &
Suppose "nosparse.so" is on /root/vmware and your guest .vmx file is /vmware/Linux/Linux.vmx
Your guest OS needs at least more than 200MB memory allocated.
Generating .vmem file takes some time. Please be patient.
Author: Kanatoko<anvil@jumperz.net>
http://www.jumperz.net/
*******/
#include <dlfcn.h>
#include <syslog.h>
#include <fstream>
#if defined(RTLD_NEXT)
#define REAL_LIBC RTLD_NEXT
#else
#define REAL_LIBC ((void *) -1L)
#endif
using namespace std;
static int flag1 = 0;
// pointer to the original function
static int (*original_pwrite64) (int file_descriptor, const void *buf, size_t nbyte, off64_t offset) = NULL;
// for logging
#define LOG(...) do { \
syslog(LOG_INFO, __VA_ARGS__); \
} while(0)
#define SADDR_B(target,shift) (((target) >> (shift)) & 0x000000ff)
static void __attribute__ ((constructor))
_constructor()
{
// for syslog
openlog(NULL, LOG_CONS | LOG_NDELAY | LOG_PID, LOG_USER);
//get address of the original function
original_pwrite64 = (int(*)(int,const void*,size_t, off64_t)) dlsym(REAL_LIBC, "pwrite64");
}
static void __attribute__ ((destructor))
_destructor()
{
closelog();
}
ssize_t pwrite64(int fd, const void *buf, size_t nbyte, off64_t offset)
{
int rv;
if( flag1 == 0
&& offset > ( 1024 * 1024 * 200 ) //works only if offset is larger than 200MB
&& nbyte == 1
)
{
flag1 = 1;
LOG( "pwrite64 is hooked. ARGS: nbyte=%d, offset=%d\n", nbyte, (int)offset );
LOG( "creating .vmem file...\n" );
int bufsize = 1024 * 1024;
char buffer[ bufsize ];
off64_t remain = offset + 1;
while( remain > 0 )
{
if( remain > bufsize )
{
rv = write( fd, buffer, bufsize );
}
else
{
rv = write( fd, buffer, remain );
}
if( rv == -1 )
{
LOG( "write failed.\n" );
return -1;
}
remain -= rv;
}
return 1;
}
else
{
rv = (*original_pwrite64)(fd, buf, nbyte, offset );
return rv;
}
}
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