[Borgbackup] Did anyone ever test SSHFS with FUSES's NOFORGET-option?

[Thorsten Schöning]

Hi all,

I'm refering to the following problem:

https://borgbackup.readthedocs.io/en/stable/faq.html#why-is-backup-slow-for-me

After looking at your issue tracker and stuff, whenever people ran
into that problem and SSHFS really was the issue, instead of changing
mount points or alike, I couldn't find the options people used SSHFS
with.

The point is that FUSE supports two interesting options: "use_ino",
which is documented to allow the file system to "set" inodes. OTOH,
I've read that SSHFS is based on SFTP, which doesn't provide inodes at
all. So "set" might really be meant as it is, like a value not being
available when only read in this setup.

> -o use_ino
> let filesystem set inode numbers

https://linux.die.net/man/1/sshfs

But there's additionally the option "noforget" and that doesn't seem
to even be documented for SSHFS:

> Never forget cached inodes

https://www.fsl.cs.stonybrook.edu/docs/fuse/fuse-article-appendices.html

And here's the interesting part: I've found someone describing inode
related problems with GIT and SSHFS and "noforget" seems to have fixed
those:

> Fuse version 2.8.x has a "noforget" option that should provide stable
> inode numbers, at the cost of unbounded memory use. Could you please
> try if this option fixes these issues?

https://git.vger.kernel.narkive.com/L4f8hTjT/inode-problem-when-using-git-on-a-sshfs-filesystem#post3
https://git.vger.kernel.narkive.com/L4f8hTjT/inode-problem-when-using-git-on-a-sshfs-filesystem#post4

As both mentioned options are disabled by default accoridng the docs,
I wondered if it's known that those have been explicitly tested ever?

Or is it known already that those can't work with Borg?

Especially the latter reads to me like FUSE is calculating inodes
somehow on its own and those are stable then onyl for a longer period
of time. But I couldn't find how those are calculated especially with
SSHFS and how long those would be valid. I guess only for how long a
file system is mounted?

Thanks!

Mit freundlichen Grüßen

Thorsten Schöning

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Für Rückfragen stehe ich Ihnen sehr gerne zur Verfügung.

Mit freundlichen Grüßen

Thorsten Schöning


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