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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)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | SEE ALSO

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