2001-07-09 06:47:10 +00:00
|
|
|
.\"
|
|
|
|
|
.\" Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. 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(s), this list of conditions and the following disclaimer as
|
|
|
|
|
.\" the first lines of this file unmodified other than the possible
|
|
|
|
|
.\" addition of one or more copyright notices.
|
|
|
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
|
|
|
.\" notice(s), this list of conditions and the following disclaimer in the
|
|
|
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
|
|
|
.\"
|
|
|
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``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 COPYRIGHT HOLDER(S) 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.
|
|
|
|
|
.\"
|
|
|
|
|
.\" $FreeBSD$
|
|
|
|
|
.\"
|
|
|
|
|
.Dd July 8, 2001
|
|
|
|
|
.Dt VFS_BUSY 9
|
|
|
|
|
.Os
|
|
|
|
|
.Sh NAME
|
|
|
|
|
.Nm vfs_busy
|
2001-07-11 10:31:49 +00:00
|
|
|
.Nd "marks a mount point as busy"
|
2001-07-09 06:47:10 +00:00
|
|
|
.Sh SYNOPSIS
|
2001-07-11 10:31:49 +00:00
|
|
|
.In sys/param.h
|
|
|
|
|
.In sys/mount.h
|
2001-07-09 06:47:10 +00:00
|
|
|
.Ft int
|
2001-10-06 11:19:41 +00:00
|
|
|
.Fn vfs_busy "struct mount *mp" "int flags" "struct mtx *interlkp" "struct thread *td"
|
2001-07-09 06:47:10 +00:00
|
|
|
.Sh DESCRIPTION
|
|
|
|
|
The
|
2001-07-11 10:31:49 +00:00
|
|
|
.Fn vfs_busy
|
|
|
|
|
function marks a mount point as busy.
|
|
|
|
|
The purpose of this
|
|
|
|
|
function is to synchronize access to a mount point.
|
2001-07-13 08:14:54 +00:00
|
|
|
It also delays unmounting by sleeping on
|
|
|
|
|
.Fa mp
|
|
|
|
|
if the
|
2001-07-11 10:31:49 +00:00
|
|
|
.Dv MNTK_UNMOUNT
|
|
|
|
|
flag is set in
|
|
|
|
|
.Fa mp->mnt_kern_flag
|
|
|
|
|
and the
|
|
|
|
|
.Dv LK_NOWAIT
|
|
|
|
|
flag is
|
|
|
|
|
.Em not
|
|
|
|
|
set.
|
2001-07-09 06:47:10 +00:00
|
|
|
.Pp
|
|
|
|
|
Its arguments are:
|
2001-07-13 09:09:52 +00:00
|
|
|
.Bl -tag -width ".Fa interlkp"
|
2001-07-11 10:31:49 +00:00
|
|
|
.It Fa mp
|
2001-07-09 06:47:10 +00:00
|
|
|
The mount point to busy.
|
2001-07-11 10:31:49 +00:00
|
|
|
.It Fa flags
|
2001-07-13 08:14:54 +00:00
|
|
|
Flags controlling how
|
|
|
|
|
.Fn vfs_busy
|
|
|
|
|
should act.
|
2001-07-13 09:09:52 +00:00
|
|
|
.Bl -tag -width ".Dv LK_NOWAIT"
|
2001-07-11 10:31:49 +00:00
|
|
|
.It Dv LK_NOWAIT
|
|
|
|
|
do not sleep if
|
|
|
|
|
.Dv MNTK_UNMOUNT
|
|
|
|
|
is set.
|
|
|
|
|
.El
|
|
|
|
|
.It Fa interlkp
|
|
|
|
|
The interlock mutex for
|
|
|
|
|
.Fa mp->mount_lock .
|
|
|
|
|
If there is any chance
|
|
|
|
|
the mount point is being unmounted and
|
|
|
|
|
.Dv LK_NOWAIT
|
|
|
|
|
is not set then
|
2001-07-09 06:47:10 +00:00
|
|
|
interlock must be valid locked mutex.
|
2001-10-06 11:19:41 +00:00
|
|
|
.It Fa td
|
|
|
|
|
The thread responsible for this call.
|
2001-07-09 06:47:10 +00:00
|
|
|
.El
|
|
|
|
|
.Sh LOCKS
|
2001-07-11 10:31:49 +00:00
|
|
|
If
|
|
|
|
|
.Fa interlkp
|
|
|
|
|
is a valid pointer it must be locked on entry,
|
2001-07-13 08:14:54 +00:00
|
|
|
and it will not be unlocked even in the case of an error.
|
2001-07-09 06:47:10 +00:00
|
|
|
.Sh RETURN VALUES
|
2001-07-11 10:31:49 +00:00
|
|
|
A 0 value is returned on success.
|
|
|
|
|
If the mount point is being
|
|
|
|
|
unmounted
|
|
|
|
|
.Er ENOENT
|
|
|
|
|
will always be returned.
|
2001-07-09 06:47:10 +00:00
|
|
|
.Sh ERRORS
|
2001-07-11 10:31:49 +00:00
|
|
|
.Bl -tag -width Er
|
|
|
|
|
.It Bq Er ENOENT
|
|
|
|
|
The mount point is being unmounted
|
|
|
|
|
.Dv ( MNTK_UNMOUNT
|
|
|
|
|
is set).
|
2001-07-09 06:47:10 +00:00
|
|
|
.El
|
|
|
|
|
.Sh AUTHORS
|
2001-07-11 10:31:49 +00:00
|
|
|
This man page was written by
|
2001-07-13 08:14:54 +00:00
|
|
|
.An Chad David Aq davidc@acns.ab.ca .
|
