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.

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