vfs_bio.c revision 259200 breaks writing to tape drive on current

[Konstantin Belousov]

On Mon, Dec 23, 2013 at 05:35:23AM -0800, Manfred Antar wrote:
> At 11:31 PM 12/22/2013, you wrote:
> >On Sun, Dec 22, 2013 at 09:54:49AM -0800, Manfred Antar wrote:
> >> The change to vfs_bio.c in revision 259200 breaks writing to scsi tape drive on i386 and sparc64 on current.
> >> I don't have any other machines to test on.
> >> here is example:
> >> 
> >> r259199:
> >> (/)4794}mt rew
> >> (/)4795}tar cvf /dev/sa0 kernel
> >> a kernel
> >> 
> >> r259200:
> >> (/)4781}mt rew
> >> (/)4782}tar cvf /dev/sa0 kernel
> >> a kerneltar: Write error
> >> 
> >> the changes between the two revisions:
> >> line 3682 removed:
> >> 
> >> bp->b_resid = bip->bio_resid;   /* XXX: remove */
> >> 
> >> I noticed this when trying to do a dump and getting end of tape error.
> >> tried different tape drives , different cables no change.
> >> backed out r259200 to 259199 and everything works as before.
> >> Manfred
> >
> >Show me the kdump of the tar commands on both revisions.
> >
> 
> It will take me a few hours, back to work today.
> Same thing happens with dump too.
> The Tape drives are  SCSI Quantum DLT  used on both machines i386 and sparc64 (Sun Netra)
> using version 258174 of vfs_bio.c  on current kernels, I was able to do a full dump of both machines without a problem.
> The error is when trying to read or write to the tape drive.
> What is the exact command for kdump that you want ?
> I can do it when I get home this afternoon.
> Thanks
> Manfred
> 

ktrace -i tar ...
kdump -s >some.file
I need some.file.
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