STATFS(2)

NAME
statfs, fstatfs - get file system statistics

SYNOPSIS
#include <sys/vfs.h>

int statfs(const char *path, struct statfs *buf);
int fstatfs(int fd, struct statfs *buf);

DESCRIPTION
statfs returns information about a mounted file system. path is the path name of any file within the mounted filesystem. buf is a pointer to a statfs structure defined as follows:
    struct statfs {
       long    f_type;     /* type of filesystem (see below) */
       long    f_bsize;    /* optimal transfer block size */
       long    f_blocks;   /* total data blocks in file system */
       long    f_bfree;    /* free blocks in fs */
       long    f_bavail;   /* free blocks avail to non-superuser */
       long    f_files;    /* total file nodes in file system */
       long    f_ffree;    /* free file nodes in fs */
       fsid_t  f_fsid;     /* file system id */
       long    f_namelen;  /* maximum length of filenames */
       long    f_spare[6]; /* spare for later */
    };
    File system types:
    linux/affs_fs.h:
       AFFS_SUPER_MAGIC      0xADFF
    linux/efs_fs.h:
       EFS_SUPER_MAGIC       0x00414A53
    linux/ext_fs.h:
       EXT_SUPER_MAGIC       0x137D
    linux/ext2_fs.h:
       EXT2_OLD_SUPER_MAGIC  0xEF51
       EXT2_SUPER_MAGIC      0xEF53
    linux/hpfs_fs.h:
       HPFS_SUPER_MAGIC      0xF995E849
    linux/iso_fs.h:
       ISOFS_SUPER_MAGIC     0x9660
    linux/minix_fs.h:
       MINIX_SUPER_MAGIC     0x137F /* orig. minix */
       MINIX_SUPER_MAGIC2    0x138F /* 30 char minix */
       MINIX2_SUPER_MAGIC    0x2468 /* minix V2 */
       MINIX2_SUPER_MAGIC2   0x2478 /* minix V2, 30 char names */
    linux/msdos_fs.h:
       MSDOS_SUPER_MAGIC     0x4d44
    linux/ncp_fs.h:
       NCP_SUPER_MAGIC       0x564c
    linux/nfs_fs.h:
       NFS_SUPER_MAGIC       0x6969
    linux/proc_fs.h:
       PROC_SUPER_MAGIC      0x9fa0
    linux/smb_fs.h:
       SMB_SUPER_MAGIC       0x517B
    linux/sysv_fs.h:
       XENIX_SUPER_MAGIC     0x012FF7B4
       SYSV4_SUPER_MAGIC     0x012FF7B5
       SYSV2_SUPER_MAGIC     0x012FF7B6
       COH_SUPER_MAGIC       0x012FF7B7
    linux/ufs_fs.h:
       UFS_MAGIC             0x00011954
    linux/xfs_fs.h:
       XFS_SUPER_MAGIC       0x58465342
    linux/xia_fs.h:
       _XIAFS_SUPER_MAGIC    0x012FD16D

Fields that are undefined for a particular file system are set to 0. fstatfs returns the same information about an open file referenced by descriptor fd.

RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.

ERRORS
For statfs:

ENOTDIR
    A component of the path prefix of path is not a directory.

ENAMETOOLONG
    path is too long.

ENOENT
    The file referred to by path does not exist.

EACCES
    Search permission is denied for a component of the path prefix of path.

ELOOP
    Too many symbolic links were encountered in translating path.

EFAULT
    Buf or path points to an invalid address.

EIO An I/O error occurred while reading from or writing to the file system.

ENOMEM
    Insufficient kernel memory was available.

ENOSYS
    The filesystem path is on does not support statfs.

For fstatfs:

EBADF
    fd is not a valid open file descriptor.

EFAULT
    buf points to an invalid address.

EIO An I/O error occurred while reading from or writing to the file system.

ENOSYS
    The filesystem fd is open on does not support statfs.

CONFORMING TO
The Linux statfs was inspired by the 4.4BSD one (but they do not use the same structure).

SEE ALSO
stat(2)