Re: Simulating disk failure with a writeback cache

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On Sun, Dec 18, 2016 at 05:51:11PM -0900, Kent Overstreet wrote:
> On Sun, Dec 18, 2016 at 09:19:57PM +0000, Josef Bacik wrote:
> > Eeesh these are older than I thought, I pushed to
> > https://github.com/josefbacik/fstests.git.  The fsx work is there and is
> > generic, the fsstress one has some btrfs specific stuff but you can just pull
> > that crap out and it'll work on anything.  Let me know if you need anything
> > else, thanks,
> 
> Thanks
> 
> I got your first fsx based test up and running, but - did you get it to pass
> with any existing filesystems?
> 
> I finally figured out what I'm seeing, in _check_files() where it's looping over
> the mark: I changed it to so that it always checks the fsync marks in the order
> where it was created, but when it goes to check the very first mark it's getting
> the very last version of the file (at least, the file size is consistent with
> that).
> 
> I just pushed what I'm working off of, but I don't think it's anything I
> broke...
> 
> https://evilpiepirate.org/git/xfstests.git

Just figured it out - log replay doesn't touch anything that hadn't been written
at that point in the log, so the newer journal entries were still there. fun...

If I blow away the journal before replay, it works.
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