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how to get the file system size


 
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# 1  
Old 02-13-2008
how to get the file system size

I have the next code, and the output is incosistent, what is the problem:

free blocks: 1201595
block size: 4096
total size(free blocks * block size): 626765824

1201595 * 4096 not is 626765824, what's the problem???

#include <sys/statvfs.h>
#include <stdio.h>

int main(){

struct statvfs buffer;
int status;
int free_blk;
int blk_size;

status = statvfs("/", &buffer);

printf("free blocks: %u\n",buffer.f_bavail);
printf("block size: %u\n",buffer.f_bsize);

free_blk = buffer.f_bavail;
blk_size = buffer.f_bsize;
printf("total size: %u\n",free_blk*blk_size);
return 0;
}

Thks
# 2  
Old 02-13-2008
The problem is an integer overflow.
Declare the variables free_blk and blk_size as long and change the format of the last printf statement as follow:

Code:
#include <sys/statvfs.h>
#include <stdio.h>

int main(){

  struct statvfs buffer;
  int status;
  long free_blk;
  long blk_size;

  status = statvfs("/", &buffer);

  printf("free blocks: %u\n",buffer.f_bavail);
  printf("block size: %u\n",buffer.f_bsize);

  free_blk = buffer.f_bavail;
  blk_size = buffer.f_bsize;
  printf("total size: %Ld\n",free_blk*blk_size);
  return 0;
}

Regards

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