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78 lines
2.5 KiB
Groff
78 lines
2.5 KiB
Groff
.\"
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.\" Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. 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(s), this list of conditions and the following disclaimer as
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.\" the first lines of this file unmodified other than the possible
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.\" addition of one or more copyright notices.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice(s), 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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
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.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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.\" DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
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.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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.\" 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 SUCH
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.\" DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd November 21, 2001
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.Dt VFS_MOUNTEDON 9
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.Os
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.Sh NAME
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.Nm vfs_mountedon
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.Nd "check if the vnode belongs to a mounted file system"
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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 vfs_mountedon "struct vnode *vp"
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.Sh DESCRIPTION
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.Fn vfs_mountedon
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inspects the
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.Vt mount
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structure in
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.Fa vp
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to determine if it points to a valid mount point.
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If the mount is valid, the vnode is considered to be busy.
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.Pp
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A common use of
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.Fn vfs_mountedon
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is to call it on device vnodes to determine if they are already associated with
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a file system.
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This is done to prevent multiple mounts on the same device.
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.Sh RETURN VALUES
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.Er EBUSY
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is returned if the vnode has a valid mount point; otherwise, 0 is returned.
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.Sh PSEUDOCODE
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.Bd -literal
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int
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ffs_mountfs(devvp, mp, td, malloctype)
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register struct vnode *devvp;
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struct mount *mp;
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struct thread *td;
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struct malloc_type *malloctype;
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{
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...
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error = vfs_mountedon(devvp);
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if (error)
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return (error);
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...
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}
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.Ed
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.Sh AUTHORS
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This manual page was written by
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.An Chad David Aq davidc@acns.ab.ca .
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