[Lustre-discuss] File access question

[Kevin Van Maren]

You can have execute-only files on Lustre, but do see
https://bugzilla.lustre.org/show_bug.cgi?id=22376 for this issue 
reported with v1.8

Kevin


Ms. Megan Larko wrote:
> Hello,
>
> I am trying to understand the way in which a file on a lustre (1.6.7)
> file system is accessed.
>
> I have a legitimate need to have an executable file execute-only; no
> read permission at all.  Testing on ext3 I can do this by "chmod 110
> a.out".   A user in the group is able to successfully execute the
> file.   If I attempt to do the same thing on a Lustre file system I
> see the error message "Permission denied".   I can gain access by
> setting the g+r.  That last setting is not permissible for this
> specific file.   In trying to understand how this works I selected the
> on-line Lustre 1.8.x Manual (
> http://wiki.lustre.org/manual/LustreManual18_HTML/IntroductionToLustre.html
> ).  Figure 1.5 seemed to indicate that a read operation to get the
> pointers to pass back to the client is required.   Essentially because
> of the separation of metadata from the file system on which the data
> file actually physically resides an "execute-only"  file on a Lustre
> file system is not possible.
>
> Is this thinking correct?
>
> Thank you,
> Megan Larko
>
> (now with SGI Federal)
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