Re: [PATCH 25/25] xfs: add write verifiers to log recovery

[Christoph Hellwig <hch@xxxxxxxxxxxxx>]

> Remote attr buffers aren't logged - they are written sycnhronously
> during the transaction - so won't get found by this.

Oh right.  Removing the synchronous writes for the remote attrs is
someting we should tackled on day as well.

> As for remote
> symlink buffers, yeah, that might be a problem. Ultimately, both of
> these buffer types are going to grow headers for CRCs, so this
> problem will go away. I'm not sure how to address this problem
> in the mean time short of putting the buffer content type into all
> the buf_log_format headers. Do you have any better ideas?

I can't think of a really good idea.  But introducing user exploitable
issues in log recovery is something I'd avoid.  I also hate having to
change the log format now if we're going to bump it soon again.  Let
me look a bit more at the log recovery code if there's some way to
interfer the buffer type.