df.c

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #include <sys/statvfs.h>
   3 #include <stdio.h>
   4 #include <assert.h>
   5 #include <string.h>
   6 #include <sys/types.h>
   7 #include <errno.h>
   8
   9 #include "gcc-compat.h"
  10 #include "log.h"
  11 #include "err.h"
  12 #include "str.h"
  13 #include "df.h"
  14
  15 int get_disk_space(const char *path, struct disk_space *result)
  16 {
  17         /* With floats we don't need to care about integer overflows. */
  18         float total_blocks, available_blocks, blocksize;
  19         float total_inodes, available_inodes;
  20
  21         struct statvfs vfs;
  22         int ret = statvfs(path, &vfs);
  23         if (ret < 0)
  24                 return -ERRNO_TO_DSS_ERROR(errno);
  25
  26         available_blocks = vfs.f_bavail;
  27         blocksize = vfs.f_bsize;
  28         total_blocks = vfs.f_blocks;
  29         total_inodes = vfs.f_files;
  30         available_inodes = vfs.f_ffree;
  31
  32         result->total_mb = total_blocks * blocksize / 1024.0 / 1024.0;
  33         result->free_mb =  available_blocks * blocksize / 1024.0 / 1024.0;
  34         result->percent_free = 100.0 * available_blocks / total_blocks + 0.5;
  35         result->percent_free_inodes = 100.0 * available_inodes / total_inodes + 0.5;
  36         return 1;
  37 }
  38
  39 void log_disk_space(struct disk_space *ds)
  40 {
  41         DSS_INFO_LOG(("free: %uM/%uM (%u%%), %u%% inodes unused\n",
  42                 ds->free_mb, ds->total_mb, ds->percent_free,
  43                 ds->percent_free_inodes));
  44 }