freebsd-dev/share/man/man9/vfs_mountedon.9
Hiten Pandya 09356c8484 Mdoc Janitor:
* Use 'manual' instead of 'man' for consistency.
2003-10-23 06:24:55 +00:00

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.\" Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. All rights reserved.
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.\" $FreeBSD$
.\"
.Dd November 21, 2001
.Dt VFS_MOUNTEDON 9
.Os
.Sh NAME
.Nm vfs_mountedon
.Nd "check if the vnode belongs to a mounted file system"
.Sh SYNOPSIS
.In sys/param.h
.In sys/mount.h
.Ft int
.Fn vfs_mountedon "struct vnode *vp"
.Sh DESCRIPTION
.Fn vfs_mountedon
inspects the
.Vt mount
structure in
.Fa vp
to determine if it points to a valid mount point.
If the mount is valid, the vnode is considered to be busy.
.Pp
A common use of
.Fn vfs_mountedon
is to call it on device vnodes to determine if they are already associated with
a file system.
This is done to prevent multiple mounts on the same device.
.Sh RETURN VALUES
.Er EBUSY
is returned if the vnode has a valid mount point; otherwise, 0 is returned.
.Sh PSEUDOCODE
.Bd -literal
int
ffs_mountfs(devvp, mp, td, malloctype)
register struct vnode *devvp;
struct mount *mp;
struct thread *td;
struct malloc_type *malloctype;
{
...
error = vfs_mountedon(devvp);
if (error)
return (error);
...
}
.Ed
.Sh AUTHORS
This manual page was written by
.An Chad David Aq davidc@acns.ab.ca .