Re: Fedora 33 System-Wide Change proposal: Make btrfs the default file system for desktop variants

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* Josef Bacik:

> As for your ENOSPC issue, I've made improvements on that area.  I
> see this in production as well, I have monitoring in place to deal
> with the machine before it gets to this point.  That being said if
> you run the box out of metadata space things get tricky to fix.
> I've been working my way down the list of issues in this area for
> years, this last go around of patches I sent were in these corner
> cases.

Is there anything we need to do in userspace to improve the behavior
of fflush and similar interfaces?

This is not strictly a btrfs issue: Some of us are worried about
scenarios where the write system call succeeds and the data never
makes it to storage *without a catastrophic failure*.  (I do not
consider running out of disk space a catastrophic failure.)  NFS
apparently has this property, and you have to call fsync or close the
descriptor to detect this.  fsync is not desirable due to its
performance impact.
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