Tejun Heo wrote:
Hello, Jeff, Albert ATA developers.
This is the final one of recent document series for libata EH - SCSI
EH, ATA exceptions, libata EH and, this one - libata new EH.
This document tries to discuss how to implement new advanced EH. It
also describes some proposed
Jeff Garzik wrote:
Linux is NOT about big designs. Linus says do what you must, and no
more.
The scsi subsystem is used in so many divergent areas, its set of
requirements is big. Therefore its design has to be big.
The future will bring other baby steps that evolve us towards a more
On Thu, 2005-09-01 at 01:54 -0400, Jeff Garzik wrote:
The long term direction for the SCSI core seems to be that of
requiring auto-sensing.
No, I don't see the mid-layer error thread handling of this ever going
away.
libata is simply being lazy: while the SCSI core continues to support
On 09/01/05 09:24, James Bottomley wrote:
On Thu, 2005-09-01 at 01:54 -0400, Jeff Garzik wrote:
The long term direction for the SCSI core seems to be that of
requiring auto-sensing.
No, I don't see the mid-layer error thread handling of this ever going
away.
libata is simply being lazy:
Luben Tuikov wrote:
On 09/01/05 09:24, James Bottomley wrote:
On Thu, 2005-09-01 at 01:54 -0400, Jeff Garzik wrote:
The long term direction for the SCSI core seems to be that of
requiring auto-sensing.
No, I don't see the mid-layer error thread handling of this ever going
away.
libata
On Thu, 2005-09-01 at 18:07 -0400, Luben Tuikov wrote:
Well, not really, since it's basic SCSI and the explanation's pretty
long. However, the standards have several pages about it. For your
reading pleasure, I suggest SAM-2 section 5.9.1 Contingent allegiance
(CA) and auto contingent
On 09/01/05 17:46, Jeff Garzik wrote:
This is the same reason a couple RAID drivers use the SCSI layer. It
has nothing to do with SCSI-as-defined-by-T10, and more to do with the
Do you think T10 has anything to offer Linux SCSI Core?
Luben
fact that SCSI provides a robust
Luben Tuikov wrote:
On 09/01/05 17:46, Jeff Garzik wrote:
libata is simply being lazy: while the SCSI core continues to support
kicking the EH thread when sense is missing, it's preferred for libata
to reuse that infrastructure.
That makes the most sense ;-)
For libata it doesn't really
On 09/01/05 18:23, James Bottomley wrote:
On Thu, 2005-09-01 at 18:07 -0400, Luben Tuikov wrote:
Well, not really, since it's basic SCSI and the explanation's pretty
long. However, the standards have several pages about it. For your
reading pleasure, I suggest SAM-2 section 5.9.1 Contingent
On 09/01/05 19:01, James Bottomley wrote:
On Thu, 2005-09-01 at 18:36 -0400, Luben Tuikov wrote:
So are you claiming that
the error handler clears contingent allegiance conditions ?
Please point me to the lines in the source code where it does this
and how it does it.
That's this
On 09/01/05 18:27, Jeff Garzik wrote:
I think it's only because it's there and that it provides
a uniform access -- provided by SCSI, _not_ by that particular
SCSI implementation.
You're correct in one sense, but I still don't think you understand
Linux development at a fundamental level.
On 09/01/05 19:01, James Bottomley wrote:
On Thu, 2005-09-01 at 18:36 -0400, Luben Tuikov wrote:
So are you claiming that
the error handler clears contingent allegiance conditions ?
Please point me to the lines in the source code where it does this
and how it does it.
That's this
Luben Tuikov wrote:
On 08/30/05 06:26, Tejun Heo wrote:
Albert Lee wrote:
4. Corresponding scmd's result code is set to
SAM_STAT_CHECK_CONDITION and qc-scsidone() callback is called
directly. As we haven't filled sense data,
scsi_determine_disposition() will return FAILED and SCSI EH
Tejun Heo wrote:
IMHO, it's a good idea to maintain one qc to one ATA/ATAPI command
mapping as long as possible. And, in the suggested framework, it's
guaranteed that no other command can come inbetween CHECK_SENSE and
REQUEST_SENSE.
Requesting sense from EH, calling
BTW I still have three of your documents to review and comment on.
Haven't forgotten about them.
Jeff
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Hello, Jeff.
On Wed, Aug 31, 2005 at 10:22:17PM -0400, Jeff Garzik wrote:
Tejun Heo wrote:
IMHO, it's a good idea to maintain one qc to one ATA/ATAPI command
mapping as long as possible. And, in the suggested framework, it's
guaranteed that no other command can come inbetween CHECK_SENSE
--- Tejun Heo [EMAIL PROTECTED] wrote:
IMHO, it's a good idea to maintain one qc to one ATA/ATAPI command
mapping as long as possible. And, in the suggested framework, it's
Yes, that makes sense.
guaranteed that no other command can come inbetween CHECK_SENSE and
REQUEST_SENSE.
That's
--- Jeff Garzik [EMAIL PROTECTED] wrote:
Tejun Heo wrote:
IMHO, it's a good idea to maintain one qc to one ATA/ATAPI command
mapping as long as possible. And, in the suggested framework, it's
guaranteed that no other command can come inbetween CHECK_SENSE and
REQUEST_SENSE.
--- Tejun Heo [EMAIL PROTECTED] wrote:
As implementing autosensing will probably need rewriting failed qc
for REQUEST SENSE command, I'm opposing it. My proposal is to do the
following, which, in effect, should be equivalent to autosensing.
1. ATAPI CHECK SENSE occurs
2. libata fails
Hello, Luben.
Luben Tuikov wrote:
--- Tejun Heo [EMAIL PROTECTED] wrote:
As implementing autosensing will probably need rewriting failed qc
for REQUEST SENSE command, I'm opposing it. My proposal is to do the
following, which, in effect, should be equivalent to autosensing.
1. ATAPI CHECK
Albert Lee wrote:
4. Corresponding scmd's result code is set to
SAM_STAT_CHECK_CONDITION and qc-scsidone() callback is called
directly. As we haven't filled sense data,
scsi_determine_disposition() will return FAILED and SCSI EH will
be scheduled. Note that as we directly call
Oops, typos.
Gotta take a nap.
On Mon, Aug 29, 2005 at 03:11:24PM +0900, Tejun Heo wrote:
Hello, Jeff, Albert ATA developers.
This is the final one of recent document series for libata EH - SCSI
EH, ATA exceptions, libata EH and, this one - libata new EH.
This document tries to
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