df.c

   1 #include <sys/statvfs.h>
   2 #include <stdio.h>
   3 #include <assert.h>
   4 #include <string.h>
   5 #include <sys/types.h>
   6 #include <errno.h>
   7
   8 #include "gcc-compat.h"
   9 #include "log.h"
  10 #include "error.h"
  11 #include "string.h"
  12 #include "df.h"
  13
  14 int get_disk_space(const char *path, struct disk_space *result)
  15 {
  16         /* using floats allows to not care about integer overflows */
  17         float total_blocks, available_blocks, blocksize;
  18         float total_inodes, available_inodes;
  19
  20         struct statvfs vfs;
  21         int ret = statvfs(path, &vfs);
  22         if (ret < 0)
  23                 return -ERRNO_TO_DSS_ERROR(errno);
  24
  25         available_blocks = vfs.f_bavail;
  26         blocksize = vfs.f_bsize;
  27         total_blocks = vfs.f_blocks;
  28         total_inodes = vfs.f_files;
  29         available_inodes = vfs.f_ffree;
  30
  31         result->total_mb = total_blocks * blocksize / 1024.0 / 1024.0;
  32         result->free_mb =  available_blocks * blocksize / 1024.0 / 1024.0;
  33         result->percent_free = 100.0 * available_blocks / total_blocks + 0.5;
  34         result->percent_free_inodes = 100.0 * available_inodes / total_inodes + 0.5;
  35         return 1;
  36 }
  37
  38 void log_disk_space(struct disk_space *ds)
  39 {
  40         DSS_INFO_LOG("free: %uM/%uM (%u%%), %u%% inodes unused\n",
  41                 ds->free_mb, ds->total_mb, ds->percent_free,
  42                 ds->percent_free_inodes);
  43 }