9d33a9d96f
There are FAT12 and FAT16 file systems, but FAT13 of was an unintentional invention of mine ... Reported by: Ravi Pokala <rpokala@freebsd.org> MFC after: 1 month
257 lines
7.5 KiB
Groff
257 lines
7.5 KiB
Groff
.\" Copyright (c) 1989, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)statfs.2 8.5 (Berkeley) 5/24/95
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.\" $FreeBSD$
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.\"
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.Dd March 29, 2023
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.Dt STATFS 2
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.Os
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.Sh NAME
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.Nm statfs
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.Nd get file system statistics
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/mount.h
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.Ft int
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.Fn statfs "const char *path" "struct statfs *buf"
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.Ft int
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.Fn fstatfs "int fd" "struct statfs *buf"
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.Sh DESCRIPTION
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The
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.Fn statfs
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system call
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returns information about a mounted file system.
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The
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.Fa path
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argument
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is the path name of any file within the mounted file system.
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The
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.Fa buf
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argument
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is a pointer to a
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.Vt statfs
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structure defined as follows:
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.Bd -literal
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typedef struct fsid { int32_t val[2]; } fsid_t; /* file system id type */
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/*
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* filesystem statistics
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*/
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#define MFSNAMELEN 16 /* length of type name including null */
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#define MNAMELEN 1024 /* size of on/from name bufs */
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#define STATFS_VERSION 0x20140518 /* current version number */
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struct statfs {
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uint32_t f_version; /* structure version number */
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uint32_t f_type; /* type of filesystem */
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uint64_t f_flags; /* copy of mount exported flags */
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uint64_t f_bsize; /* filesystem fragment size */
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uint64_t f_iosize; /* optimal transfer block size */
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uint64_t f_blocks; /* total data blocks in filesystem */
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uint64_t f_bfree; /* free blocks in filesystem */
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int64_t f_bavail; /* free blocks avail to non-superuser */
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uint64_t f_files; /* total file nodes in filesystem */
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int64_t f_ffree; /* free nodes avail to non-superuser */
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uint64_t f_syncwrites; /* count of sync writes since mount */
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uint64_t f_asyncwrites; /* count of async writes since mount */
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uint64_t f_syncreads; /* count of sync reads since mount */
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uint64_t f_asyncreads; /* count of async reads since mount */
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uint64_t f_spare[10]; /* unused spare */
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uint32_t f_namemax; /* maximum filename length */
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uid_t f_owner; /* user that mounted the filesystem */
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fsid_t f_fsid; /* filesystem id */
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char f_charspare[80]; /* spare string space */
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char f_fstypename[MFSNAMELEN]; /* filesystem type name */
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char f_mntfromname[MNAMELEN]; /* mounted filesystem */
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char f_mntonname[MNAMELEN]; /* directory on which mounted */
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};
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.Ed
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.Pp
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The flags that may be returned include:
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.Bl -tag -width MNT_SYNCHRONOUS
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.It Dv MNT_RDONLY
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The file system is mounted read-only;
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Even the super-user may not write on it.
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.It Dv MNT_NOEXEC
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Files may not be executed from the file system.
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.It Dv MNT_NOSUID
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Setuid and setgid bits on files are not honored when they are executed.
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.It Dv MNT_SYNCHRONOUS
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All I/O to the file system is done synchronously.
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.It Dv MNT_ASYNC
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No file system I/O is done synchronously.
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.It Dv MNT_SOFTDEP
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Soft updates being done (see
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.Xr ffs 7 ) .
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.It Dv MNT_GJOURNAL
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Journaling with gjournal is enabled (see
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.Xr gjournal 8 ) .
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.It Dv MNT_SUIDDIR
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Special handling of SUID bit on directories.
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.It Dv MNT_UNION
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Union with underlying file system.
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.It Dv MNT_NOSYMFOLLOW
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Symbolic links are not followed.
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.It Dv MNT_NOCLUSTERR
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Read clustering is disabled.
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.It Dv MNT_NOCLUSTERW
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Write clustering is disabled.
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.\".It Dv MNT_JAILDEVFS
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.\"XXX
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.It Dv MNT_MULTILABEL
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Mandatory Access Control (MAC) support for individual objects
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(see
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.Xr mac 4 ) .
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.It Dv MNT_ACLS
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Access Control List (ACL) support enabled.
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.It Dv MNT_LOCAL
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The file system resides locally.
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.It Dv MNT_QUOTA
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The file system has quotas enabled on it.
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.It Dv MNT_ROOTFS
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Identifies the root file system.
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.It Dv MNT_EXRDONLY
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The file system is exported read-only.
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.It Dv MNT_NOATIME
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Updating of file access times is disabled.
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.It Dv MNT_USER
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The file system has been mounted by a user.
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.\".It Dv MNT_IGNORE
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.\"XXX
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.It Dv MNT_EXPORTED
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The file system is exported for both reading and writing.
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.It Dv MNT_DEFEXPORTED
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The file system is exported for both reading and writing to any Internet host.
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.It Dv MNT_EXPORTANON
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The file system maps all remote accesses to the anonymous user.
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.It Dv MNT_EXKERB
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The file system is exported with Kerberos uid mapping.
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.It Dv MNT_EXPUBLIC
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The file system is exported publicly (WebNFS).
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.El
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.Pp
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Fields that are undefined for a particular file system are set to -1.
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The
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.Fn fstatfs
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system call
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returns the same information about an open file referenced by descriptor
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.Fa fd .
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.Sh RETURN VALUES
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.Rv -std
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.Sh ERRORS
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The
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.Fn statfs
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system call
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fails if one or more of the following are true:
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.Bl -tag -width Er
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.It Bq Er ENOTDIR
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A component of the path prefix of
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.Fa path
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is not a directory.
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.It Bq Er ENAMETOOLONG
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The length of a component of
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.Fa path
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exceeds 255 characters,
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or the length of
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.Fa path
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exceeds 1023 characters.
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.It Bq Er ENOENT
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The file referred to by
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.Fa path
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does not exist.
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.It Bq Er EACCES
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Search permission is denied for a component of the path prefix of
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.Fa path .
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.It Bq Er ELOOP
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Too many symbolic links were encountered in translating
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.Fa path .
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.It Bq Er EFAULT
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The
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.Fa buf
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or
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.Fa path
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argument
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points to an invalid address.
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.It Bq Er EIO
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An
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.Tn I/O
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error occurred while reading from or writing to the file system.
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.It Bq Er EINTEGRITY
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Corrupted data was detected while reading from the file system.
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.El
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.Pp
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The
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.Fn fstatfs
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system call
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fails if one or more of the following are true:
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.Bl -tag -width Er
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.It Bq Er EBADF
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The
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.Fa fd
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argument
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is not a valid open file descriptor.
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.It Bq Er EFAULT
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The
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.Fa buf
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argument
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points to an invalid address.
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.It Bq Er EIO
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An
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.Tn I/O
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error occurred while reading from or writing to the file system.
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.It Bq Er EINTEGRITY
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Corrupted data was detected while reading from the file system.
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.El
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.Sh NOTES
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The fields in the
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.Vt statfs
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structure have been defined to provide the parameters relevant for
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traditional
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.Tm UNIX
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file systems.
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For some other file systems, values that have similar, but not
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identical, semantics to those described above may be returned.
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An example is msdosfs, which in case of FAT12 or FAT16 file systems
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reports the number of available and of free root directory entries
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instead of inodes
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.Po
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where 1 to 21 such directory entries are required to store
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each file or directory name or disk label
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.Pc .
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.Sh SEE ALSO
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.Xr fhstatfs 2 ,
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.Xr getfsstat 2
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.Sh HISTORY
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The
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.Fn statfs
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system call first appeared in
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.Bx 4.4 .
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