STATFS(2)						     Linux Programmer's Manual							 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)

Linux 2.0.30							    1997-08-21								 STATFS(2)