.\"
.\" @(#)statfs.2 8.3 (Berkeley) 2/11/94
.\"
-.Dd February 11, 1994
+.Dd August 14, 2008
.Dt STATFS 2
.Os
.Sh NAME
-.Nm statfs
+.Nm statfs,
+.Nm statfs64,
+.Nm fstatfs,
+.Nm fstatfs64
.Nd get file system statistics
.Sh SYNOPSIS
.Fd #include <sys/param.h>
.Fn statfs "const char *path" "struct statfs *buf"
.Ft int
.Fn fstatfs "int fd" "struct statfs *buf"
+.Sh TRANSITIONAL SYNOPSIS (NOW DEPRECATED)
+.Ft int
+.br
+.Fn statfs64 "const char *path" "struct statfs64 *buf" ;
+.sp
+.Ft int
+.br
+.Fn fstatfs64 "int fd" "struct statfs64 *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 statfs structure defined as follows:
+The
+.Fn statfs
+routine returns information about a mounted file system.
+The
+.Fa path
+argument is the path name of any file or directory within the mounted file system.
+The
+.Fa buf
+argument is a pointer to a
+.Fa statfs
+structure.
+When the macro
+.Dv _DARWIN_FEATURE_64_BIT_INODE
+is not defined (see
+.Xr stat 2
+for more information on this macro), the
+.Fa statfs
+structure is defined as:
.Bd -literal
typedef struct { int32_t val[2]; } fsid_t;
-#define MFSNAMELEN 16 /* length of fs type name, including nul */
-#define MNAMELEN 32 /* length of buffer for returned name */
+#define MFSNAMELEN 15 /* length of fs type name, not inc. nul */
+#define MNAMELEN 90 /* length of buffer for returned name */
-struct statfs {
- short f_type; /* type of file system (unused; zero) */
- short f_flags; /* copy of mount flags */
+struct statfs { /* when _DARWIN_FEATURE_64_BIT_INODE is NOT defined */
+ short f_otype; /* type of file system (reserved: zero) */
+ short f_oflags; /* copy of mount flags (reserved: zero) */
long f_bsize; /* fundamental file system block size */
long f_iosize; /* optimal transfer block size */
long f_blocks; /* total data blocks in file system */
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 (super-user only) */
+ fsid_t f_fsid; /* file system id */
uid_t f_owner; /* user that mounted the file system */
- long f_spare[4]; /* spare for later */
+ short f_reserved1; /* reserved for future use */
+ short f_type; /* type of file system (reserved) */
+ long f_flags; /* copy of mount flags (reserved) */
+ long f_reserved2[2]; /* reserved for future use */
char f_fstypename[MFSNAMELEN]; /* fs type name */
char f_mntonname[MNAMELEN]; /* directory on which mounted */
char f_mntfromname[MNAMELEN]; /* mounted file system */
+ char f_reserved3; /* reserved for future use */
+ long f_reserved4[4]; /* reserved for future use */
};
.Ed
.Pp
+However, when the macro
+.Dv _DARWIN_FEATURE_64_BIT_INODE
+is defined, the
+.Fa statfs
+structure is defined as:
+.Bd -literal
+#define MFSTYPENAMELEN 16 /* length of fs type name including null */
+#define MAXPATHLEN 1024
+#define MNAMELEN MAXPATHLEN
+
+struct statfs { /* when _DARWIN_FEATURE_64_BIT_INODE is defined */
+ 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
+Note that the
+.Fa f_fstypename ,
+.Fa f_mntonname ,
+and
+.Fa f_mntfromname
+fields are also wider in this variant.
+.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
+The
+.Fn fstatfs
+routine returns the same information about an open file referenced by descriptor
.Fa fd .
+.Sh FLAGS
+.Bl -tag -width MNT_UNKNOWNPERMISSIONS
+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
+.It Dv MNT_CPROTECT
+File system supports per-file encrypted data protection
+.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:
+The
+.Fn statfs
+routine 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
.Dv {PATH_MAX}
characters.
.It Bq Er ENOENT
-The file referred to by
+The file or directory referred to by
.Fa path
does not exist.
.It Bq Er EACCES
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:
+The
+.Fn fstatfs
+routine fails if one or more of the following are true:
.Bl -tag -width Er
.It Bq Er EBADF
.Fa fd
.Tn I/O
error occurred while reading from or writing to the file system.
.El
+.Sh TRANSITIONAL DESCRIPTION (NOW DEPRECATED)
+The
+.Fa statfs64
+and
+.Fa fstatfs64
+routines are equivalent to their corresponding non-64-suffixed routine,
+when 64-bit inodes are in effect.
+They were added before there was support for the symbol variants, and so are
+now deprecated.
+Instead of using these, set the
+.Dv _DARWIN_USE_64_BIT_INODE
+macro before including header files to force 64-bit inode support.
+.Pp
+The
+.Fa statfs64
+structure used by these deprecated routines is the same as the
+.Fa statfs
+structure when 64-bit inodes are in effect (see above).
.Sh HISTORY
The
.Fn statfs
-function first appeared in 4.4BSD.
+function first appeared in 4.4BSD. The
+.Fn statfs64
+and
+.Fn fstatfs64
+first appeared in Max OS X 10.5 (Leopard) and are now deprecated
+in favor of the corresponding symbol variants.
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