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98 lines
3.1 KiB
Groff
98 lines
3.1 KiB
Groff
.\" Copyright (C) 2008 Chad David <davidc@acns.ab.ca>.
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.\" 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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.Dd January 29, 2022
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.Dt INSMNTQUE 9
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.Os
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.Sh NAME
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.Nm insmntque ,
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.Nm insmntque1
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.Nd "associate a vnode with a mount"
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/vnode.h
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.Ft int
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.Fn insmntque "struct vnode *vp" "struct mount *mp"
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.Ft int
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.Fn insmntque1 "struct vnode *vp" "struct mount *mp"
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.Sh DESCRIPTION
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The
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.Fn insmntque
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function associates a vnode with a mount.
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This includes updating
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.Va v_mount
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for the vnode, and inserting the vnode into the mount's vnode list.
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.Pp
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The indirect mount reference count, maintained as the count of the
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vnodes owned by it, is incremented for each vnode added to the
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mount, and that reference is decremented by
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.Xr vgone 9 .
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.Pp
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The mount's interlock is held while the vnode is inserted.
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The vnode must be exclusively locked.
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.Pp
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On failure,
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.Fn insmntque
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resets vnode' operation vector to the vector of
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.Xr deadfs 9 ,
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clears
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.Va v_data ,
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and then calls
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.Xr vgone 9
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and
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.Xr vput 9 .
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If more elaborated cleanup after
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.Fn insmntque
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failure is needed, the
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.Fn insmntque1
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function may be used instead.
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It does not do any cleanup following a failure, leaving all
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the work to the caller.
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In particular, the operation vector
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.Va v_op
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and
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.Va v_data
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fields of the vnode are kept intact.
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.Sh RETURN VALUES
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The
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.Fn insmntque
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function will always return 0, unless the file system is currently being unmounted
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in which case it may return
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.Dv EBUSY .
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Also,
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.Fn insmntque
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may be forced to insert the vnode into the mount's vnode list
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by setting the
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.Va VV_FORCEINSMQ
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flag in the vnode
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.Va v_flag ,
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even if the file system is being unmounted.
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.Sh SEE ALSO
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.Xr vgone 9
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.Sh AUTHORS
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This manual page was written by
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.An Chad David Aq Mt davidc@acns.ab.ca .
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