https://jira.whamcloud.com This file is an XML representation of an issue en-us 9.4.14 940014 05-12-2023 https://jira.whamcloud.com/browse/LU-11988 Lustre <p>Some lustre stats that used to be in /proc now reside in debugfs.  This seems all for the better, but it looks like the lctl <span class="error">&#91;get|set|list&#93;</span>_param commands were not updated to look for the values in the new location.  Since the lctl *_param functions are meant to make these kinds of moves transparent to users, we think it is important to have lctl look in debugfs as well.</p> <p>For example, in going from 2.10 to 2.12, we noticed that 'llite.*.stats' seem to have disappeared (but really are just hiding in debugfs):</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>$ lctl get_param 'llite.*.stats' error: get_param: param_path 'llite/*/stats': No such file or directory </pre> </div></div> LU-11988

Some lctl *_param values only readable by root

Bug Major Resolved Duplicate Patrick Farrell Christopher Morrone llnl Thu, 21 Feb 2019 21:38:00 +0000 Mon, 25 Feb 2019 18:24:41 +0000 Mon, 25 Feb 2019 18:24:41 +0000 Lustre 2.12.0 0 4 <p>Hmm, it does look there, and has since well before 2.12.  lctl finds the llite stats just fine on my node here, and it's definitely in debugfs.</p> <p>Let's check a few things.</p> <p>cat /proc/version</p> <p>mount -t lustre<br/> lctl --version</p> <p>Verify the file is really there in debugfs - maybe debugfs isn't mounted or Lustre isn't mounted or something else is weird...?</p> <p>Show the exact path in debugfs, in case something odd is up with that...?</p> <p>Then, strace -v your lctl get_param command, and let's see if we learn anything else.</p> <p> </p> <p>BTW, this is the patch that added it:</p> <p><a href="https://jira.whamcloud.com/browse/LU-5030" title="&quot;lctl {get,set}_param&quot; should also check in /sys/fs/{lnet,lustre}" class="issue-link" data-issue-key="LU-5030"><del>LU-5030</del></a> libcfs: create cfs_get_paths() function</p> <p>With the move of the upstream client to sysfs the<br/> lustre and lnet utilites no long should directly<br/> access the proc file system. To avoid this a new<br/> function is created to support both the traditional<br/> procfs lustre/lnet parameters as well as the new<br/> sysfs lustre/lnet parameters as well. Besides the<br/> creation of these functions the LNet utilites are<br/> converted to use these new functions.</p> <p>Change-Id: I78788f41955073e1e48126103ef2aec13d64812b<br/> Signed-off-by: Dmitry Eremin &lt;dmitry.eremin@intel.com&gt;<br/> Signed-off-by: James Simmons &lt;uja.ornl@yahoo.com&gt;<br/> Signed-off-by: Wang Chao &lt;chao.ornl@gmail.com&gt;<br/> Reviewed-on: <a href="http://review.whamcloud.com/17459" class="external-link" target="_blank" rel="nofollow noopener">http://review.whamcloud.com/17459</a><br/> Tested-by: Jenkins<br/> Tested-by: Maloo &lt;hpdd-maloo@intel.com&gt;<br/> Reviewed-by: Andreas Dilger &lt;andreas.dilger@intel.com&gt;<br/> Reviewed-by: Ryan Haasken &lt;haasken@cray.com&gt;<br/> Reviewed-by: Emoly Liu &lt;emoly.liu@intel.com&gt;</p> <p>We do assume a mount point for debugfs:</p> {/sys/\{fs,kernel/debug} <p>/{lnet,lustre}/,<br/> ie, /sys/kernel/debug/</p> <p>Are you attempting to run as a non-root user? By default debugfs only allows root access.</p> <p>Doh!  Yeah, it is just a permissions problem, my bad.</p> <p>What is the approach to address this from Lustre folks so far?  I assume that debugfs is probably root-only access for a reason, but there are things in there that we want to allow non-root processes to access. </p> <p>Also, if lctl had returned a permissions error rather than a not-found error, that might have made it more obvious what I was looking for.</p> <p>To let you know I'm work on a solution to resolve this (<a href="https://jira.whamcloud.com/browse/LU-11850" title="Relocating /proc/fs/lustre/ost to /sys/kernel/debug/lustre/ost prevents non-root access" class="issue-link" data-issue-key="LU-11850">LU-11850</a>). Its up to Peter if its okay to backport to 2.12 LTS.</p> <p>Resolving as duplicate of <a href="https://jira.whamcloud.com/browse/LU-11850" title="Relocating /proc/fs/lustre/ost to /sys/kernel/debug/lustre/ost prevents non-root access" class="issue-link" data-issue-key="LU-11850">LU-11850</a>.</p> Duplicate LU-11850 Related LU-11850 Development Rank 1|i00c1b: Rank (Obsolete) 9223372036854775807 Severity