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

6       nbdkit-noextents-filter - disable extents in the underlying plugin
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SYNOPSIS

9        nbdkit --filter=noextents plugin
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DESCRIPTION

12       “Extents” are a feature of the NBD protocol / nbdkit which allow the
13       client to detect sparse regions of the underlying disk.
14       "nbdkit-noextents-filter" disables this so that the plugin appears to
15       be fully allocated.
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17       This filter can be useful when combined with nbdkit-file-plugin(1)
18       serving a file from a file system known to have poor lseek(2)
19       performance ("tmpfs" is known to be one such system).
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PARAMETERS

22       There are no parameters specific to nbdkit-noextents-filter.  Any
23       parameters are passed through to and processed by the underlying plugin
24       in the normal way.
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SEE ALSO

27       nbdkit(1), nbdkit-filter(3), nbdkit-nozero-filter(1),
28       nbdkit-file-plugin(1).
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AUTHORS

31       Richard W.M. Jones
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34       Copyright (C) 2019 Red Hat Inc.
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LICENSE

37       Redistribution and use in source and binary forms, with or without
38       modification, are permitted provided that the following conditions are
39       met:
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41       ·   Redistributions of source code must retain the above copyright
42           notice, this list of conditions and the following disclaimer.
43
44       ·   Redistributions in binary form must reproduce the above copyright
45           notice, this list of conditions and the following disclaimer in the
46           documentation and/or other materials provided with the
47           distribution.
48
49       ·   Neither the name of Red Hat nor the names of its contributors may
50           be used to endorse or promote products derived from this software
51           without specific prior written permission.
52
53       THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND ANY
54       EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55       IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
56       PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR CONTRIBUTORS BE
57       LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
58       CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
59       SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
60       BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
61       WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
62       OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
63       ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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67nbdkit-1.12.3                     2019-05-21        nbdkit-noextents-filter(1)
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