192 lines
6.3 KiB
Groff
192 lines
6.3 KiB
Groff
.\" $NetBSD: statvfs.5,v 1.16 2021/10/21 13:21:53 andvar Exp $
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.\"
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.\" 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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.\"
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.Dd September 22, 2019
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.Dt STATVFS 5
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.Os
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.Sh NAME
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.Nm statvfs
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.Nd file system statistics
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.Sh SYNOPSIS
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.In sys/types.h
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.In sys/statvfs.h
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.Sh DESCRIPTION
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The
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.In sys/statvfs.h
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header defines the structures and functions that
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return information about a mounted file system.
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The
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.Nm statvfs
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structure is defined as follows:
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.Bd -literal
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typedef struct { int32_t val[2]; } fsid_t; /* file system id type */
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#define VFS_NAMELEN 32 /* length of fs type name, including nul */
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#define VFS_MNAMELEN 1024 /* length of buffer for returned name */
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struct statvfs {
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unsigned long f_flag; /* copy of mount exported flags */
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unsigned long f_bsize; /* system block size */
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unsigned long f_frsize; /* system fragment size */
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unsigned long f_iosize; /* optimal file system block size */
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/* The following are in units of f_frsize */
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fsblkcnt_t f_blocks; /* number of blocks in file system */
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fsblkcnt_t f_bfree; /* free blocks avail in file system */
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fsblkcnt_t f_bavail; /* free blocks avail to non-root */
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fsblkcnt_t f_bresvd; /* blocks reserved for root */
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fsfilcnt_t f_files; /* total file nodes in file system */
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fsfilcnt_t f_ffree; /* free file nodes in file system */
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fsfilcnt_t f_favail /* free file nodes avail to non-root */
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fsfilcnt_t f_fresvd; /* file nodes reserved for root */
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uint64_t f_syncreads; /* count of sync reads since mount */
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uint64_t f_syncwrites; /* count of sync writes since mount */
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uint64_t f_asyncreads; /* count of async reads since mount */
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uint64_t f_asyncwrites; /* count of async writes since mount */
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unsigned long f_fsid; /* POSIX compliant file system id */
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fsid_t f_fsidx; /* NetBSD compatible file system id */
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unsigned long f_namemax; /* maximum filename length */
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uid_t f_owner; /* user that mounted the file system */
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uint64_t f_spare[4]; /* spare space */
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char f_fstypename[VFS_NAMELEN]; /* fs type name */
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char f_mntonname[VFS_MNAMELEN]; /* directory on which mounted */
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char f_mntfromname[VFS_MNAMELEN]; /* mounted file system */
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char f_mntfromlabel[_VFS_MNAMELEN]; /* disk label name if avail */
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};
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.Ed
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.Pp
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The
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.Fa f_flag
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argument can have the following bits set:
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.Bl -tag -width ST_SYNCHRONOUS
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.It Dv ST_RDONLY
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The filesystem is mounted read-only;
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Even the super-user may not write on it.
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.It Dv ST_NOEXEC
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Files may not be executed from the filesystem.
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.It Dv ST_NOSUID
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Setuid and setgid bits on files are not honored when they are executed.
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.It Dv ST_NODEV
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Special files in the filesystem may not be opened.
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.It Dv ST_UNION
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Union with underlying filesystem instead of obscuring it.
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.It Dv ST_SYNCHRONOUS
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All I/O to the filesystem is done synchronously.
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.It Dv ST_ASYNC
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No filesystem I/O is done synchronously.
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.It Dv ST_NOCOREDUMP
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Don't write core dumps to this file system.
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.It Dv ST_NOATIME
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Never update access times.
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.It Dv ST_SYMPERM
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Recognize symbolic link permission.
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.It Dv ST_NODEVMTIME
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Never update modification times for device files.
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.It Dv ST_LOG
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Use logging (journaling).
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.It Dv ST_LOCAL
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The filesystem resides locally.
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.It Dv ST_QUOTA
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The filesystem has quotas enabled on it.
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.It Dv ST_ROOTFS
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Identifies the root filesystem.
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.It Dv ST_EXRDONLY
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The filesystem is exported read-only.
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.It Dv ST_EXPORTED
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The filesystem is exported for both reading and writing.
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.It Dv ST_DEFEXPORTED
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The filesystem is exported for both reading and writing to any Internet host.
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.It Dv ST_EXPORTANON
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The filesystem maps all remote accesses to the anonymous user.
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.It Dv ST_EXKERB
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The filesystem is exported with Kerberos uid mapping.
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.It Dv ST_EXNORESPORT
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Don't enforce reserved ports (NFS).
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.It Dv ST_EXPUBLIC
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Public export (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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.Sh NOTES
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.Bl -tag -width f_bavail
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.It f_flag
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The
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.Fa f_flag
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field is the same as the
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.Fa f_flags
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field in the
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.Bx 4.3
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.Ic statfs
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system call.
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.It f_fsid
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Is defined to be
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.Ft unsigned long
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by the X/Open standard.
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Unfortunately this is not enough space to store our
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.Ft fsid_t ,
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so we define an additional
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.Fa f_fsidx
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field.
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.It f_bavail
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Could historically be negative (in the
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.Ic statfs
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system call) when the used space has exceeded
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the non-superuser free space.
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In order to comply with the X/Open standard, we have to define
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.Ft fsblkcnt_t
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as an unsigned type, so in all cases where
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.Fa f_bavail
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would have been negative, we set it to 0.
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In addition we provide
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.Fa f_bresvd
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which contains the amount of reserved blocks for the superuser, so
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the old value of
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.Fa f_bavail
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can be easily computed as:
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.Bd -literal
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old_bavail = f_bfree - f_bresvd;
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.Ed
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.El
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.Sh SEE ALSO
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.Xr statvfs 2
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.Sh HISTORY
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The
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.In sys/statvfs.h
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header first appeared in
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.Nx 3.0 .
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