2001-07-09 06:47:10 +00:00
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.\"
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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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.\" 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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.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
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.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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.\" $FreeBSD$
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.\"
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2013-02-11 10:14:12 +00:00
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.Dd February 11, 2013
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2001-07-09 06:47:10 +00:00
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.Dt VFS_BUSY 9
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.Os
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.Sh NAME
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.Nm vfs_busy
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.Nd "marks a mount point as busy"
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.Sh SYNOPSIS
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2001-07-11 10:31:49 +00:00
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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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2008-11-02 10:33:57 +00:00
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.Fn vfs_busy "struct mount *mp" "int flags"
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.Sh DESCRIPTION
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The
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.Fn vfs_busy
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2010-06-14 17:31:46 +00:00
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function marks a mount point as busy by incrementing
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the reference count of a mount point.
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2001-07-13 08:14:54 +00:00
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It also delays unmounting by sleeping on
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.Fa mp
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if the
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.Dv MNTK_UNMOUNT
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flag is set in
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.Fa mp->mnt_kern_flag
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and the
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.Dv MBF_NOWAIT
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flag is
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.Em not
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set.
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.Pp
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Its arguments are:
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.Bl -tag -width ".Fa flags"
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.It Fa mp
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The mount point to busy.
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2001-07-11 10:31:49 +00:00
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.It Fa flags
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2001-07-13 08:14:54 +00:00
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Flags controlling how
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.Fn vfs_busy
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should act.
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2008-11-02 10:33:57 +00:00
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.Bl -tag -width ".Dv MBF_MNTLSTLOCK"
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.It Dv MBF_NOWAIT
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do not sleep if
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.Dv MNTK_UNMOUNT
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is set.
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2008-11-02 10:33:57 +00:00
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.It Dv MBF_MNTLSTLOCK
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drop the mountlist_mtx in the critical path.
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2001-07-11 10:31:49 +00:00
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.El
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2001-07-09 06:47:10 +00:00
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.El
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.Sh RETURN VALUES
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2001-07-11 10:31:49 +00:00
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A 0 value is returned on success.
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If the mount point is being
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2010-06-14 17:31:46 +00:00
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unmounted and MBF_NOWAIT flag is specified
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2001-07-11 10:31:49 +00:00
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.Er ENOENT
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will be returned.
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.Sh ERRORS
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2001-07-11 10:31:49 +00:00
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.Bl -tag -width Er
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.It Bq Er ENOENT
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The mount point is being unmounted
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.Dv ( MNTK_UNMOUNT
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is set).
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2001-07-09 06:47:10 +00:00
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.El
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2013-02-11 10:14:12 +00:00
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.Sh SEE ALSO
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.Xr vfs_unbusy 9
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2001-07-09 06:47:10 +00:00
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.Sh AUTHORS
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2003-10-23 06:24:55 +00:00
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This manual page was written by
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2014-06-26 21:44:30 +00:00
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.An Chad David Aq Mt davidc@acns.ab.ca .
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