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<div class="moz-cite-prefix">On 10/16/2016 02:40 PM, Ankireddypalle
Reddy wrote:<br>
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<p class="MsoNormal"><span style="color:#1F497D">The encryption
xlator is the last one before posix and it’s here that the
data is getting encrypted. When the data is read back the
encrypted data is returned. Decryption is supposed to happen
in read callback which does not seem to be happening. The
fact that encrypted data is getting returned indicates that
data in turn is getting returned from the posix/underlying
fs layer. Is it possible that data be returned by reading
from the underlying fs by any translator other than posix.</span></p>
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No, rot13_readv() just winds it to the xlator below (posix) and
decrypts the read in the cbk. Have you tried disabling the perf
xlators on the client like I suggested? You can see if
client3_3_readv() is hit on the client (mount) process when you read
the file. If it is and despite it, posix_readv is not hit on the
brick, then something fishy is going on.<br>
-Ravi<br>
<br>
<br>
<span style="color:#1F497D"><o:p></o:p></span>
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<p class="MsoNormal"><span style="color:#1F497D">Thanks and
Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Ram<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">
Ravishankar N [<a class="moz-txt-link-freetext" href="mailto:ravishankar@redhat.com">mailto:ravishankar@redhat.com</a>]
<br>
<b>Sent:</b> Sunday, October 16, 2016 12:19 AM<br>
<b>To:</b> Ankireddypalle Reddy;
<a class="moz-txt-link-abbreviated" href="mailto:gluster-users@gluster.org">gluster-users@gluster.org</a><br>
<b>Subject:</b> Re: [Gluster-users] rot-13 Translator
query<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">On 10/15/2016 08:22 PM, Ankireddypalle
Reddy wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"> I am trying to follow the below
document for developing a translator.<o:p></o:p></p>
<p class="MsoNormal"> <a moz-do-not-send="true"
href="https://github.com/gluster/glusterfs/blob/master/doc/developer-guide/translator-development.md">https://github.com/gluster/glusterfs/blob/master/doc/developer-guide/translator-development.md</a><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> I’ve created a replica volume and
modified the vol file to include rot-13 translator. Below is
the snippet from vol file.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">volume myvol-posix<o:p></o:p></p>
<p class="MsoNormal"> type storage/posix<o:p></o:p></p>
<p class="MsoNormal"> option volume-id
b492191e-77a5-4fc3-9394-49218e36dae2<o:p></o:p></p>
<p class="MsoNormal"> option directory /brick1/repli<o:p></o:p></p>
<p class="MsoNormal">end-volume<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">volume <b><span style="color:red">myvol-rot13</span></b><o:p></o:p></p>
<p class="MsoNormal"> type encryption/rot-13<o:p></o:p></p>
<p class="MsoNormal"> subvolumes <b><span
style="color:red">myvol-posix</span></b><o:p></o:p></p>
<p class="MsoNormal">end-volume<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">volume myvol-trash<o:p></o:p></p>
<p class="MsoNormal"> type features/trash<o:p></o:p></p>
<p class="MsoNormal"> option trash-internal-op off<o:p></o:p></p>
<p class="MsoNormal"> option brick-path /brick1/repli<o:p></o:p></p>
<p class="MsoNormal"> option trash-dir .trashcan<o:p></o:p></p>
<p class="MsoNormal"> subvolumes <b><span
style="color:red">myvol-rot13</span></b><o:p></o:p></p>
<p class="MsoNormal">end-volume<o:p></o:p></p>
<p class="MsoNormal">…<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">The writes are getting intercepted by the
translator and the file is getting encrypted. But the reads
don’t seem to be getting intercepted by the translator. I
tried setting break point in the posix_readv function and
attach the brick daemons to gdb. But posix_readv does not
seem to be getting called on the brick daemon and the read
completes on the application side.
<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Can someone please explain how the reads
are getting serviced here without hitting the posix layer.<o:p></o:p></p>
</blockquote>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif"">It could be due to client
side caching. I usually disable all performance xlators
(write-behind, read-head, io-cache, stat-prefetch,
quick-read, open-behind) when I want to remove caching
effects while debugging. drop-caches also helps.<br>
<br>
HTH,<br>
Ravi<br>
<br>
<br>
<o:p></o:p></span></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Thanks and Regards,<o:p></o:p></p>
<p class="MsoNormal">Ram <o:p></o:p></p>
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