e42b096439
EINTEGRITY was previously documented as a UFS-specific error for mount(2). This documents EINTEGRITY as a filesystem-independent error that may be reported by the backing store of a filesystem. While here, document EIO as a filesystem-independent error for both mount(2) and posix_fadvise(2). EIO was previously only documented for UFS for mount(2). Reviewed by: mckusick Suggested by: mckusick MFC after: 2 weeks Sponsored by: Chelsio Communications Differential Revision: https://reviews.freebsd.org/D24168
133 lines
3.7 KiB
Groff
133 lines
3.7 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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.\" @(#)getfsstat.2 8.3 (Berkeley) 5/25/95
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.\" $FreeBSD$
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.\"
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.Dd March 30, 2020
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.Dt GETFSSTAT 2
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.Os
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.Sh NAME
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.Nm getfsstat
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.Nd get list of all mounted file systems
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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/ucred.h
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.In sys/mount.h
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.Ft int
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.Fn getfsstat "struct statfs *buf" "long bufsize" "int mode"
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.Sh DESCRIPTION
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The
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.Fn getfsstat
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system call
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returns information about all mounted file systems.
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The
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.Fa buf
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argument
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is a pointer to
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.Vt statfs
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structures, as described in
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.Xr statfs 2 .
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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 buffer is filled with an array of
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.Fa statfs
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structures, one for each mounted file system
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up to the byte count specified by
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.Fa bufsize .
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Note, the
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.Fa bufsize
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argument is the number of bytes that
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.Fa buf
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can hold, not the count of statfs structures it will hold.
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.Pp
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If
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.Fa buf
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is given as NULL,
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.Fn getfsstat
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returns just the number of mounted file systems.
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.Pp
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Normally
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.Fa mode
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should be specified as
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.Dv MNT_WAIT .
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If
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.Fa mode
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is set to
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.Dv MNT_NOWAIT ,
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.Fn getfsstat
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will return the information it has available without requesting
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an update from each file system.
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Thus, some of the information will be out of date, but
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.Fn getfsstat
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will not block waiting for information from a file system that is
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unable to respond.
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It will also skip any file system that is in the process of being
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unmounted, even if the unmount would eventually fail.
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.Sh RETURN VALUES
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Upon successful completion, the number of
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.Fa statfs
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structures is returned.
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Otherwise, -1 is returned and the global variable
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.Va errno
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is set to indicate the error.
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.Sh ERRORS
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The
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.Fn getfsstat
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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 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 EINVAL
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.Fa mode
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is set to a value other than
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.Dv MNT_WAIT
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or
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.Dv MNT_NOWAIT .
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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 SEE ALSO
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.Xr statfs 2 ,
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.Xr fstab 5 ,
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.Xr mount 8
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.Sh HISTORY
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The
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.Fn getfsstat
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system call first appeared in
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.Bx 4.4 .
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