vfs_busy.9 (e57c2b130f2cd40967cf20698d376cc5ada95871) vfs_busy.9 (3141712daac026e09aedf0d420cb0f19d6dfb80b)
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2.\" Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. All rights reserved.
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4.\" Redistribution and use in source and binary forms, with or without
5.\" modification, are permitted provided that the following conditions
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22.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25.\" DAMAGE.
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27.\" $FreeBSD$
28.\"
1.\"
2.\" Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. All rights reserved.
3.\"
4.\" Redistribution and use in source and binary forms, with or without
5.\" modification, are permitted provided that the following conditions
6.\" are met:
7.\" 1. Redistributions of source code must retain the above copyright
8.\" notice(s), this list of conditions and the following disclaimer as

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21.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
25.\" DAMAGE.
26.\"
27.\" $FreeBSD$
28.\"
29.Dd November 2, 2008
29.Dd June 14, 2010
30.Dt VFS_BUSY 9
31.Os
32.Sh NAME
33.Nm vfs_busy
34.Nd "marks a mount point as busy"
35.Sh SYNOPSIS
36.In sys/param.h
37.In sys/mount.h
38.Ft int
39.Fn vfs_busy "struct mount *mp" "int flags"
40.Sh DESCRIPTION
41The
42.Fn vfs_busy
30.Dt VFS_BUSY 9
31.Os
32.Sh NAME
33.Nm vfs_busy
34.Nd "marks a mount point as busy"
35.Sh SYNOPSIS
36.In sys/param.h
37.In sys/mount.h
38.Ft int
39.Fn vfs_busy "struct mount *mp" "int flags"
40.Sh DESCRIPTION
41The
42.Fn vfs_busy
43function marks a mount point as busy.
44The purpose of this
45function is to synchronize access to a mount point.
43function marks a mount point as busy by incrementing
44the reference count of a mount point.
46It also delays unmounting by sleeping on
47.Fa mp
48if the
49.Dv MNTK_UNMOUNT
50flag is set in
51.Fa mp->mnt_kern_flag
52and the
45It also delays unmounting by sleeping on
46.Fa mp
47if the
48.Dv MNTK_UNMOUNT
49flag is set in
50.Fa mp->mnt_kern_flag
51and the
53.Dv LK_NOWAIT
52.Dv MBF_NOWAIT
54flag is
55.Em not
56set.
57.Pp
58Its arguments are:
59.Bl -tag -width ".Fa flags"
60.It Fa mp
61The mount point to busy.

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70is set.
71.It Dv MBF_MNTLSTLOCK
72drop the mountlist_mtx in the critical path.
73.El
74.El
75.Sh RETURN VALUES
76A 0 value is returned on success.
77If the mount point is being
53flag is
54.Em not
55set.
56.Pp
57Its arguments are:
58.Bl -tag -width ".Fa flags"
59.It Fa mp
60The mount point to busy.

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69is set.
70.It Dv MBF_MNTLSTLOCK
71drop the mountlist_mtx in the critical path.
72.El
73.El
74.Sh RETURN VALUES
75A 0 value is returned on success.
76If the mount point is being
78unmounted
77unmounted and MBF_NOWAIT flag is specified
79.Er ENOENT
78.Er ENOENT
80will always be returned.
79will be returned.
81.Sh ERRORS
82.Bl -tag -width Er
83.It Bq Er ENOENT
84The mount point is being unmounted
85.Dv ( MNTK_UNMOUNT
86is set).
87.El
88.Sh AUTHORS
89This manual page was written by
90.An Chad David Aq davidc@acns.ab.ca .
80.Sh ERRORS
81.Bl -tag -width Er
82.It Bq Er ENOENT
83The mount point is being unmounted
84.Dv ( MNTK_UNMOUNT
85is set).
86.El
87.Sh AUTHORS
88This manual page was written by
89.An Chad David Aq davidc@acns.ab.ca .