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Hi Andy,
Could you also check https://github.com/xrootd/xrootd/issues/1098?
When I try to read a Lustre 2.5 file using the redirector, I get
"Unable to access file; file does not exist."
Using the xrootd server, I don't have this issue.
It seems cmsd can not find the file ( or permission denied sometimes).
Sometimes I can read the Lustre 2.5 file using the redirector after touching the file or restarting xrootd/cmsd or a combination of all of those.
Can you at least let me know if this is a Lustre issue or xrootd issue?
Thanks,
Bockjoo
[log in to unmask]">Hi Brian,
We really can't do that. The reason is that the file attribute handling is a plugin that other people replace to handle their specific file system. We decided soe time ago to keep extended attributes seprate from the OSS layer to not over-complicate the whole OFS/OSS API (which is prety complicated already). Of course, the medium-term plan is to roll mult-user filesystem handling into the baseline which would include adding the fs_uid call to all he places that need it (include the fattr plugin). That is currently blocked in R5 as there we allow the authentication to specify the uid/gid to be used and we need to propogate that through.
So, as a short-term solution, add he call to the fattr code and make it a separate plugin (icky but workable).
Andy
On Fri, 23 Aug 2019, Bockelman, Brian wrote:
Hi all,
Bockjoo Kim (CC'd) at Florida utilizes the xrootd-multiuser plugin to allow Xrootd to change the thread-specific filesystem user when accessing their underlying Lustre filesystem.
This works well *except* when saving the results of checksum calculation to extended attributes; in that case, a permission denied is received. Looking at the code, it seems that the Linux setxattr function is called directly - as opposed to being managed by the OSS layer.
Is it possible to get xattrs to be handled by the OSS layer (and change XrdCks to use OSS)? That would allow a clean integration with Lustre at Florida.
Thanks,
Brian
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