Mounted Filesystem Information

For getting information of a partition (filesystem) which is mounted on a directory on Linux System, I have created a C program. Its listing is given as below:

/*
 * =====================================================================================
 *
 *       Filename:  file_system_stat.c
 *
 *    Description:  Get file system statistics of mounted partition
 *
 *        Version:  1.0
 *        Created:  Thursday 09 July 2009 10:48:02  IST IST
 *       Revision:  none
 *       Compiler:  gcc
 *
 *         Author:  Mitesh Singh Jat (mitesh)
 *
 * =====================================================================================
 */

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

int file_system_stats(const char *pathp)
{
    struct statfs sfs;
    int retval;
    if (pathp == NULL)
    {
        fprintf(stderr, "file_system_stats: cannot find stats of NULL path\n");
        return (-1);
    }
    retval = statfs(pathp, &sfs);
    if (retval < 0)
    {
        fprintf(stderr, "file_system_stats: cannot find file system\n");
        fprintf(stderr, "    stats of partition %s\n", pathp);
        return (-1);
    }
    printf("\n=== Filesystem Stats of '%s' ===\n", pathp);
    printf("Optimal Transfer Block Size = %ld\n", sfs.f_bsize);
    printf("Total data blocks           = %ld\n", sfs.f_blocks);
    printf("Total free data blocks      = %ld\n", sfs.f_bfree);
    printf("Total file nodes            = %ld\n", sfs.f_files);
    printf("Total free file nodes       = %ld\n", sfs.f_ffree);
    printf("=================================================\n\n");
    return (retval);
}

int main(int argc, char *argv[])
{
    int i;
    int retval = 0;
    if (argc <= 1)
    {
        fprintf(stderr, "Usage: %s <path> [more_paths...]\n", argv[0]);
        retval = file_system_stats("./");
        return (retval);
    }

    for (i = 1; i < argc && retval >= 0; ++i)
    {
        retval = file_system_stats(argv[i]);
    }
    return (retval);
}

Compilation:
$ gcc -Wall -o file_system_stat file_system_stat.c

Sample Runs:
--(mitesh@roundduck-lm)-(~/Programming/C/Usp)--
--(0 : 505)$ ./file_system_stat
Usage: ./file_system_stat <path> [more_paths...]

=== Filesystem Stats of './' ===
Optimal Transfer Block Size = 4096
Total data blocks = 9690330
Total free data blocks = 3956097
Total file nodes = 2449408
Total free file nodes = 2315870
=================================================

--(mitesh@roundduck-lm)-(~/Programming/C/Usp)--
--(0 : 506)$ ./file_system_stat /boot

=== Filesystem Stats of '/boot' ===
Optimal Transfer Block Size = 4096
Total data blocks = 12017122
Total free data blocks = 5616343
Total file nodes = 3055616
Total free file nodes = 2830533
=================================================

--(mitesh@roundduck-lm)-(~/Programming/C/Usp)--
--(0 : 507)$ ./file_system_stat /boot /mnt/extra

=== Filesystem Stats of '/boot' ===
Optimal Transfer Block Size = 4096
Total data blocks = 12017122
Total free data blocks = 5616343
Total file nodes = 3055616
Total free file nodes = 2830533
=================================================


=== Filesystem Stats of '/mnt/extra' ===
Optimal Transfer Block Size = 4096
Total data blocks = 21235766
Total free data blocks = 7269970
Total file nodes = 5357568
Total free file nodes = 5357279
=================================================

--(mitesh@roundduck-lm)-(~/Programming/C/Usp)--
--(1 : 508)$ ./file_system_stat /this_is_not_a_partition
file_system_stats: cannot find file system
stats of partition /this_is_not_a_partition





Note: By the way, the block size of a filesystem can be found using commands given at here or here.