Re: Simulating disk failure with a writeback cache

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> On Dec 18, 2016, at 10:07 PM, Kent Overstreet <kent.overstreet@xxxxxxxxx> wrote:
> 
>> 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://urldefense.proofpoint.com/v2/url?u=https-3A__evilpiepirate.org_git_xfstests.git&d=DgIBAg&c=5VD0RTtNlTh3ycd41b3MUw&r=sDzg6MvHymKOUgI8SFIm4Q&m=E_8Rycs0b-Vo8GLKPW3XOah6HMo1P1ixJKC56-np3BQ&s=xABKM88GhCUwdBnB8_7bzZM76O0U9tnQdK6p40kdXtU&e= 
> 
> 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.

I'm confused, are you talking about the log writes log?  Thanks,

Josef--
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