2001-12-03 00:25:04 +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 November 21, 2001
|
|
|
|
|
.Dt VFS_MOUNTEDON 9
|
|
|
|
|
.Os
|
|
|
|
|
.Sh NAME
|
|
|
|
|
.Nm vfs_mountedon
|
2002-12-12 17:26:04 +00:00
|
|
|
.Nd "check if the vnode belongs to a mounted file system"
|
2001-12-03 00:25:04 +00:00
|
|
|
.Sh SYNOPSIS
|
|
|
|
|
.In sys/param.h
|
2001-12-14 09:11:13 +00:00
|
|
|
.In sys/mount.h
|
2001-12-03 00:25:04 +00:00
|
|
|
.Ft int
|
|
|
|
|
.Fn vfs_mountedon "struct vnode *vp"
|
|
|
|
|
.Sh DESCRIPTION
|
|
|
|
|
.Fn vfs_mountedon
|
2001-12-14 09:11:13 +00:00
|
|
|
inspects the
|
|
|
|
|
.Vt mount
|
|
|
|
|
structure in
|
2001-12-03 00:25:04 +00:00
|
|
|
.Fa vp
|
|
|
|
|
to determine if it points to a valid mount point.
|
2001-12-14 09:11:13 +00:00
|
|
|
If the mount is valid, the vnode is considered to be busy.
|
2001-12-03 00:25:04 +00:00
|
|
|
.Pp
|
|
|
|
|
A common use of
|
|
|
|
|
.Fn vfs_mountedon
|
2001-12-14 09:11:13 +00:00
|
|
|
is to call it on device vnodes to determine if they are already associated with
|
2002-12-12 17:26:04 +00:00
|
|
|
a file system.
|
2001-12-03 00:25:04 +00:00
|
|
|
This is done to prevent multiple mounts on the same device.
|
|
|
|
|
.Sh RETURN VALUES
|
2001-12-14 09:11:13 +00:00
|
|
|
.Er EBUSY
|
2001-12-03 00:25:04 +00:00
|
|
|
is returned if the vnode has a valid mount point; otherwise, 0 is returned.
|
|
|
|
|
.Sh PSEUDOCODE
|
|
|
|
|
.Bd -literal
|
2001-12-14 09:11:13 +00:00
|
|
|
int
|
|
|
|
|
ffs_mountfs(devvp, mp, td, malloctype)
|
|
|
|
|
register struct vnode *devvp;
|
|
|
|
|
struct mount *mp;
|
|
|
|
|
struct thread *td;
|
|
|
|
|
struct malloc_type *malloctype;
|
|
|
|
|
{
|
|
|
|
|
...
|
2001-12-03 00:25:04 +00:00
|
|
|
|
2001-12-14 09:11:13 +00:00
|
|
|
error = vfs_mountedon(devvp);
|
|
|
|
|
if (error)
|
|
|
|
|
return (error);
|
2001-12-03 00:25:04 +00:00
|
|
|
|
2001-12-14 09:11:13 +00:00
|
|
|
...
|
|
|
|
|
}
|
2001-12-03 00:25:04 +00:00
|
|
|
.Ed
|
|
|
|
|
.Sh AUTHORS
|
2003-10-23 06:24:55 +00:00
|
|
|
This manual page was written by
|
2001-12-03 00:25:04 +00:00
|
|
|
.An Chad David Aq davidc@acns.ab.ca .
|
