f_getfree

The f_getfree function gets number of the free clusters on the volume.

FRESULT f_getfree (
  const TCHAR* path,  /* [IN] Logical drive number */
  DWORD* nclst,       /* [OUT] Number of free clusters */
  FATFS** fatfs       /* [OUT] Corresponding filesystem object */
);

Parameters

path
Pointer to the null-terminated string that specifies the logical drive. A null-string means the default drive.
nclst
Pointer to the DWORD variable to store number of free clusters.
fatfs
Pointer to pointer that to store a pointer to the corresponding file system object.

Return Values

FR_OK, FR_DISK_ERR, FR_INT_ERR, FR_NOT_READY, FR_INVALID_DRIVE, FR_NOT_ENABLED, FR_NO_FILESYSTEM, FR_TIMEOUT

Descriptions

The f_getfree function gets number of free clusters on the volume. The member csize in the file system object indicates number of sectors per cluster, so that the free space in unit of sector can be calcurated with this information. When FSINFO structure on the FAT32 volume is not in sync, this function can return an incorrect free cluster count. To avoid this problem, FatFs can be forced full FAT scan by FF_FS_NOFSINFO option.

QuickInfo

Available when FF_FS_READONLY == 0 and FF_FS_MINIMIZE == 0.

Example

    FATFS *fs;
    DWORD fre_clust, fre_sect, tot_sect;


    /* Get volume information and free clusters of drive 1 */
    res = f_getfree("1:", &fre_clust, &fs);
    if (res) die(res);

    /* Get total sectors and free sectors */
    tot_sect = (fs->n_fatent - 2) * fs->csize;
    fre_sect = fre_clust * fs->csize;

    /* Print the free space (assuming 512 bytes/sector) */
    printf("%10lu KiB total drive space.\n%10lu KiB available.\n",
           tot_sect / 2, fre_sect / 2);

See Also

FATFS

Return