Date: Fri, 19 Oct 2001 10:43:08 -0700 (PDT) From: Matthew Dillon <dillon@apollo.backplane.com> To: Stephen McKay <mckay@thehub.com.au> Cc: hackers@FreeBSD.ORG Subject: Re: vmiodirenable vs isofs, some proof Message-ID: <200110191743.f9JHh8G47321@apollo.backplane.com> References: <200110191315.f9JDFHS20600@dungeon.home>
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-Matt
Matthew Dillon
<dillon@backplane.com>
:About a month ago I suggested that vfs.vmiodirenable=1 and the cd9660
:file system interract badly. I have not got absolute proof, but I
:think fairly good evidence of a causal link.
:...
:I set vfs.vmiodirenable=0 and copied again. Exactly the same incorrect
:files. In other words, the corruption, whatever it is, was not magically
:removed by disabling vmiodirenable while the cache remained.
Turning off vmiodirenable does not effect things that are already
VMIO backed, so this is expected.
:I unmounted and remounted the CD. A copy operation was flawless at this
:point (vmiodirenable still off).
:
:I enabled vmiodirenable and the next copy was corrupt in the same manner
:(cross linked files), but the set of cross links was different than before.
:(Dang, I can't remember if I did another unmount/remount cycle before
:this copy. Oh well.)
:
:At this point, I noticed that the cross links were actual hard links
:in my HD copies. (I should have noticed how fast they were copying, I
:suppose).
:..
:Is this enough for you to form a theory? Any more experiments you
:think would be worthwhile?
:
:Stephen.
It sure looks like you can reproduce the bug at will, which is great!
Now I need to reproduce it over here. If you could email me an
ls -liaR of the CD with vmiodirenable turned off, and another ls -liaR
of the CD with vmiodirenable turned on and the corruption present,
I should be able to use that to burn a junk CD of my own to try to
reproduce the bug.
-Matt
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