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nbdkit-noextents-filter(1)	    NBDKIT	    nbdkit-noextents-filter(1)

NAME
       nbdkit-noextents-filter - disable extents in the	underlying plugin

SYNOPSIS
	nbdkit --filter=noextents plugin

DESCRIPTION
       aExtentsa are a feature of the NBD protocol / nbdkit which allow	the
       client to detect	sparse regions of the underlying disk.
       "nbdkit-noextents-filter" disables this so that the plugin appears to
       be fully	allocated, at least to a client	that requests structured
       replies.	 It is also possible to	use the	--no-sr	option to nbdkit to
       prevent the client from using structured	replies, which among its other
       side effects will prevent the client from querying extents at all.

       This filter can be useful when combined with nbdkit-file-plugin(1)
       serving a file from a file system known to have poor lseek(2)
       performance ("tmpfs" is known to	be one such system).

PARAMETERS
       There are no parameters specific	to nbdkit-noextents-filter.  Any
       parameters are passed through to	and processed by the underlying	plugin
       in the normal way.

FILES
       $filterdir/nbdkit-noextents-filter.so
	   The filter.

	   Use "nbdkit --dump-config" to find the location of $filterdir.

VERSION
       "nbdkit-noextents-filter" first appeared	in nbdkit 1.14.

SEE ALSO
       nbdkit(1), nbdkit-filter(3), nbdkit-extentlist-filter(1),
       nbdkit-fua-filter(1), nbdkit-nocache-filter(1),
       nbdkit-noparallel-filter(1), nbdkit-nozero-filter(1),
       nbdkit-file-plugin(1).

AUTHORS
       Richard W.M. Jones

COPYRIGHT
       Copyright (C) 2019 Red Hat Inc.

LICENSE
       Redistribution and use in source	and binary forms, with or without
       modification, are permitted provided that the following conditions are
       met:

       o   Redistributions of source code must retain the above	copyright
	   notice, this	list of	conditions and the following disclaimer.

       o   Redistributions in binary form must reproduce the above copyright
	   notice, this	list of	conditions and the following disclaimer	in the
	   documentation and/or	other materials	provided with the
	   distribution.

       o   Neither the name of Red Hat nor the names of	its contributors may
	   be used to endorse or promote products derived from this software
	   without specific prior written permission.

       THIS SOFTWARE IS	PROVIDED BY RED	HAT AND	CONTRIBUTORS ''AS IS'' AND ANY
       EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
       IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
       PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR CONTRIBUTORS BE
       LIABLE FOR ANY DIRECT, INDIRECT,	INCIDENTAL, SPECIAL, EXEMPLARY,	OR
       CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
       SUBSTITUTE GOODS	OR SERVICES; LOSS OF USE, DATA,	OR PROFITS; OR
       BUSINESS	INTERRUPTION) HOWEVER CAUSED AND ON ANY	THEORY OF LIABILITY,
       WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
       OTHERWISE) ARISING IN ANY WAY OUT OF THE	USE OF THIS SOFTWARE, EVEN IF
       ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

nbdkit-1.20.4			  2021-09-21	    nbdkit-noextents-filter(1)

NAME | SYNOPSIS | DESCRIPTION | PARAMETERS | FILES | VERSION | SEE ALSO | AUTHORS | COPYRIGHT | LICENSE

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