11:28 p.m.
I have also encountered same issue where the underlying file system is unmounted but
ganesha still holds it details and the device major, minor reuse later causes problems.
I can try and look into this and figure out a way to refresh the file systems list for
ganesha. But, another problem in this is if the file system was exported by ganesha,
should the export also be removed or should we wait for an explicit RemoveExport. Any way,
since the file system is unmounted, the clients will start getting ESTALEs and may be even
worse errors.
Thanks,
Sriram
On Oct 10, 2018, 11:04 PM +0530, Frank Filz <ffilzlnx(a)mindspring.com>, wrote:
- On the issue itself, I forgot to mention that we used SIGHUP to reload. As you
suggested, will work on a patch to cleanup device major/minor to reuse if
possible, although I understand delete is not completely supported via SIGHUP.
But I do see some action to remove even with SIGHUP.
You have to use DBUS to unexport. I couldn’t come up with a way to do unexport with
SIGHUP. Actually, I do have an idea, add a Unexport = true; option. If that's set and
the export is present, unexport, otherwise ignore the export - then you can leave exports
in your config but have them not be present....
If an export is removed with unexport, that should release it's filesystems, and then
a filesystem re-scan has the potential of removing filesystems no longer present (but we
have to be careful there, GPFS has some issues with filesystems going offline and then
messing up exports).
Frank
- On this list subscription - I did subscribe to the list as well as registered myself.
But I had trouble posting to the list, I had to login directly and post. I also not
received my own post yet, although I do and did get other posts.
Regards.
Krishna Harathi
On 10/9/18, 4:19 PM, "Frank Filz" <ffilzlnx(a)mindspring.com> wrote:
Ganesha's management of filesystems is probably not ideal. We can add new
ones, but I don't think we implemented removing unused ones.
I would suggest looking at the filesystem management code to see if there's a
good way to remove them.
You would have to unmount the filesystem, trigger Ganesha to clean up and
remove the filesystem, and then mount the new filesystem.
The filesystem enumeration showed multiple entries using the same device
major and minor (all really related to the same filesystem, but something about
the way Linux handles volumes and such) which means Ganesha must pick a
filesystem to use for a given device major and minor. If the device major and
minor is reused and Ganesha hasn't cleaned out the old filesystem, it will detect
the duplicate and just re-use the original filesystem (which of course no longer is
mounted...).
Frank
-----Original Message-----
From: krishna.harathi(a)storagecraft.com
[mailto:krishna.harathi@storagecraft.com]
Sent: Tuesday, October 9, 2018 3:30 PM
To: devel(a)lists.nfs-ganesha.org
Subject: [NFS-Ganesha-Devel] Ganesha 2.5.4 - usage of device major, minor
We are using Ganesha 2.5.4 VFS FSAL with FUSE based filesystem.
During our testing of deleting existing exports and creating new ones, found
that
if a device major and minor is reused, clients get ESTALE for accessing a
newly
created export (nfs2 below).
This seems to cause the following log entry, and explains the ESTALE
response.
04/10/2018 T15:16:59.769027-0700 : nfs-ganesha-26627[sigmgr] 1595
:claim_posix_filesystems :FSAL :INFO :Root fs for export /exports/nfs1 is
/exports/nfs2
We use our own Exportid and unique FSID configured for each export in the
configuration file.
I would like to know more about the intent and purpose of the usage of
device
major and minor of an export in this context.
Any help in fixing this reuse issue is also appreciated.
Thanks.
Regards.
Krishna Harathi
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