[Crash-utility] Question on how to check NFS Exported Filesystems in crash utility while analyzing vmcore file.

[Tipu .]

Hi Dave,

Really Nice information, I am running  Kernel 2.6.18-274 and will try to use the below pointers.

Regards,
Tipu.

> Date: Thu, 16 Aug 2012 10:55:06 -0400
> From: anderson at redhat.com
> To: crash-utility at redhat.com
> Subject: Re: [Crash-utility] Question on how to check NFS Exported Filesystems in crash utility while analyzing vmcore file.
> 
> 
> 
> ----- Original Message -----
> > 
> 
> > Now, that all being done, that search could have been signicantly simplified
> > given that the hash_table array is initialized to point to the static data
> > strucure "export_table":
> > 
> >  struct cache_detail svc_export_cache = {
> >           .owner          = THIS_MODULE,
> >           .hash_size      = EXPORT_HASHMAX,
> >           .hash_table     = export_table,     <=====
> >  ...
> > 
> > So if you just dump its contents directly:
> > 
> > crash> p export_table
> > export_table = $5 =
> >  {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
> >  0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
> > 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
> > 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x
> > 0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
> > 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
> >  0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
> >  0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0
> > x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
> > 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0
> > , 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
> > 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
> > 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xffff810036155280,
> > 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x
> > 0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
> > 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
> >  0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
> >  0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0
> > x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
> > 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}
> > crash>
> > 
> > And then cast each non-zero entry in the array as an svc_export as
> > done above.
> > 
> > At least I *think* that's how it works...
> 
> BTW, you didn't mention what kernel version you're looking at,
> but the sequence above looks like it would hold true through Linux 
> version 2.6.39.  But I note that the NFS bookkeeping changed after
> that, so you'd have to adjust your plan of attack...
> 
> Dave
> 
> 
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