.\" $NetBSD: statfs.2,v 1.10 1995/06/29 11:40:48 cgd Exp $
.\"
.\" Copyright (c) 1989, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" @(#)statfs.2 8.3 (Berkeley) 2/11/94
.\"
.Dd February 11, 1994
.Dt STATFS 2
.Os
.Sh NAME
.Nm statfs,
.Nm fstatfs
.Nd get file system statistics
.Sh SYNOPSIS
.Fd #include <sys/param.h>
.Fd #include <sys/mount.h>
.Ft int
.Fn statfs "const char *path" "struct statfs *buf"
.Ft int
.Fn fstatfs "int fd" "struct statfs *buf"
.Sh DESCRIPTION
.Fn Statfs
returns information about a mounted file system.
.Fa Path
is the path name of any file within the mounted file system.
.Fa Buf
is a pointer to a
.Fa statfs
structure defined as follows:
.Bd -literal
typedef struct { int32_t val[2]; } fsid_t;
#define MFSTYPENAMELEN 16 /* length of fs type name including null */
#define MAXPATHLEN 1024
struct statfs {
uint32_t f_bsize; /* fundamental file system block size */
int32_t f_iosize; /* optimal transfer block size */
uint64_t f_blocks; /* total data blocks in file system */
uint64_t f_bfree; /* free blocks in fs */
uint64_t f_bavail; /* free blocks avail to non-superuser */
uint64_t f_files; /* total file nodes in file system */
uint64_t f_ffree; /* free file nodes in fs */
fsid_t f_fsid; /* file system id */
uid_t f_owner; /* user that mounted the filesystem */
uint32_t f_type; /* type of filesystem */
uint32_t f_flags; /* copy of mount exported flags */
uint32_t f_fssubtype; /* fs sub-type (flavor) */
char f_fstypename[MFSTYPENAMELEN]; /* fs type name */
char f_mntonname[MAXPATHLEN]; /* directory on which mounted */
char f_mntfromname[MAXPATHLEN]; /* mounted filesystem */
uint32_t f_reserved[8]; /* For future use */
};
.Ed
.Pp
Fields that are undefined for a particular file system are set to -1.
.Fn Fstatfs
returns the same information about an open file referenced by descriptor
.Fa fd .
.Sh FLAGS
.Bl -tag -width MNT_UNKOWNPERMISSIONS
These are some of the flags that may be present in the f_flags field.
.It Dv MNT_RDONLY
A read-only filesystem
.It Dv MNT_SYNCHRONOUS
File system is written to synchronously
.It Dv MNT_NOEXEC
Can't exec from filesystem
.It Dv MNT_NOSUID
Setuid bits are not honored on this filesystem
.It Dv MNT_NODEV
Don't interpret special files
.It Dv MNT_UNION
Union with underlying filesysten
.It Dv MNT_ASYNC
File system written to asynchronously
.It Dv MNT_EXPORTED
File system is exported
.it Dv MNT_LOCAL
File system is stored locally
.It Dv MNT_QUOTA
Quotas are enabled on this file system
.It Dv MNT_ROOTFS
This file system is the root of the file system
.It Dv MNT_DOVOLFS
File system supports volfs
.It Dv MNT_DONTBROWSE
File system is not appropriate path to user data
.It Dv MNT_UNKNOWNPERMISSIONS
VFS will ignore ownership information on filesystem objects
.It Dv MNT_AUTOMOUNTED
File system was mounted by automounter
.It Dv MNT_JOURNALED
File system is journaled
.It Dv MNT_DEFWRITE
File system should defer writes
.It Dv MNT_MULTILABEL
MAC support for individual labels
.El
.Sh CAVEATS
In Mac OS X versions before 10.4, f_iosize is 4096. On these older
systems, use MAXBSIZE instead.
.Sh RETURN VALUES
Upon successful completion, a value of 0 is returned.
Otherwise, -1 is returned and the global variable
.Va errno
is set to indicate the error.
.Sh ERRORS
.Fn Statfs
fails if one or more of the following are true:
.Bl -tag -width Er
.It Bq Er ENOTDIR
A component of the path prefix of
.Fa Path
is not a directory.
.It Bq Er ENAMETOOLONG
The length of a component of
.Fa path
exceeds
.Dv {NAME_MAX}
characters, or the length of
.Fa path
exceeds
.Dv {PATH_MAX}
characters.
.It Bq Er ENOENT
The file referred to by
.Fa path
does not exist.
.It Bq Er EACCES
Search permission is denied for a component of the path prefix of
.Fa path .
.It Bq Er ELOOP
Too many symbolic links were encountered in translating
.Fa path .
.It Bq Er EFAULT
.Fa Buf
or
.Fa path
points to an invalid address.
.It Bq Er EIO
An
.Tn I/O
error occurred while reading from or writing to the file system.
.El
.Pp
.Fn Fstatfs
fails if one or more of the following are true:
.Bl -tag -width Er
.It Bq Er EBADF
.Fa fd
is not a valid open file descriptor.
.It Bq Er EFAULT
.Fa Buf
points to an invalid address.
.It Bq Er EIO
An
.Tn I/O
error occurred while reading from or writing to the file system.
.El
.Sh HISTORY
The
.Fn statfs
function first appeared in 4.4BSD.