sector_div has the same slightly strange calling convention do_div has:
it's return value is the modulo of the two operators, the division
result is in the first parameter.  Also optimize one of the expensive
64bit division away (okay, okay - it's not exactly an fast-path :))

Add a pointer to struct scsi_disk instead.  This also obsoletes
sd_dskname().

Now that only sd.c includes sd.h it can be safely merged into it.
Also get rid of typedef abuse in sd.c

sorry, the last patch I sent you contained a bogus change
for include/linux/init.h (to get around a local compile problem).

This patch backs it out.

Thanks to Patrick Mansfield for pointing this out.

Currnetly the ->bios_param for host drivers exposes struct scsi_disk
(aka Scsi_Disk or Disk) to each and every lowlevel driver, although
this structure should be privated to the sd driver.

All bios_param implementation do only use two fields:  .device and
.capacity.  This patch passes down those two directly and gets
rid of 99% of the sd.h inclusions (*).

I've tried to not break any driver with this patch, but given the
number of compiler errors in the current tree I might have missed
one or two.

(*) a bunch of drivers needed sd.h to get to scsi.h, I've fixed those.

into mulgrave.(none):/home/jejb/BK/scsi-misc-2.5

In 2.5.44 it contains only two functions, that both have exactly
one caller in other files and both are entirely unrelated to
request merging..

into aladin.rdu.redhat.com:/usr/src/2.5

the ->finish method is a relicat from the old day were we never had
hotplugging and allowed the driver to do fixups after all busses
had been scanned.  Nowdays only sd and sr actually implement it,
and both only defer actions to there that should actually happen in
->attach.  Change both drivers to move that code into ->attach,
clenaup the Templates to use C99 initializers and get rid of the
methods.

This also cleans up some very crude race-avoidable code in those
drivers, btw..

When a scsi device is offlined and then the system is shutdown it will
hang during the synchronizing SCSI caches task. The error handler was
activated during this step, but post recovery the system did not
complete the shutdown.

This patch just adds a check for online before sending the command. The
better approach appeared to be to use scsi_block_when_processing_errors,
but I was concerned that we might block to long in a shutdown case.

-andmike
--
Michael Anderson
andmike@us.ibm.com

 sd.c |    3 +++
 1 files changed, 3 insertions(+)

This patch corrects a problem in scsi error handling.

When a device is offlined indicated by a message like ...Device offlined
- not ready...

the command return status was not being updated with a failure status if
the IO was a timeout.

I tested the patch on system with ips, aic, and qlogic fc adapters, but
was unable to generate a satisfactory device offline test case.

I did test this fix on uml with scsi_debug and generated a device
offline condition with verified this fix was working correctly.

-andmike
--
Michael Anderson
andmike@us.ibm.com

 scsi_error.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

Scsi Host setup.

This caused the following errors on trying to compile.

drivers/scsi/inia100.c:98: unknown field `next' specified in initializer
drivers/scsi/inia100.c:98: warning: missing braces around initializer
drivers/scsi/inia100.c:98: warning: (near initialization for `driver_template.shtp_list')
drivers/scsi/inia100.c:98: unknown field `module' specified in initializer
drivers/scsi/inia100.c:98: unknown field `proc_name' specified in initializer
drivers/scsi/inia100.c:98: warning: initialization from incompatible pointer type
make[2]: *** [drivers/scsi/inia100.o] Error 1

Several of the drivers Mike modified only had the one-line change to remove
the 'next' field.  I tried it and bingo, it works and passed my tests.

The version change is what Doug Ledford intended in patch-2.5.25 back in
June 2002.  (See inia100.c "inia100_Version")

	It looks like sg.c was missed in the update from put_device to
	device_unregister.

break at compiletime instead of runtime


===== drivers/scsi/hosts.h 1.19 vs edited =====

The problem was that when the refcount hit 0, it was unconditionally
assuming that it had been added, which is wrong.  The patch below
corrects that, and fixes the Oops when loading the floppy driver.

into home.transmeta.com:/home/torvalds/v2.5/linux

into home.transmeta.com:/home/torvalds/v2.5/linux

Several ports (x86-64,ppc64,sparc64) which do 32bit ioctl emulation
have functions for drivers to let them define their own translation
handlers. So far it was a bit complicated to use because there
was no standard include file that declares the prototypes for this
stuff. Then drivers and other subsystems can start to declare their own
ioctl translation handlers.

This patch add include/linux/ioctl32.h to fix this.

The actual implementation is in arch specific code. It has been coordinated
with DaveM and Anton.

This patch is needed for the x86-64 merge I sent in separate mail.

There is currently no preprocessor symbol that the drivers can test
to see if they should use this. So far they have to check arch symbols.
This will be fixed later when all 64bit ports that need it add the dynamic
ioctl registration API too (that's ia64,s390x,mips64)

This fixes a few files that got lost with the last merge and merges
with 2.5.43/i386.  Only changes architecture specific files.

It depends on one other patch (for linux/ioctl32.h) which I'm sending
separately.

Changes:
- Include missing files (pageattr.c) and Makefile changes
- Update IA32 subsystem. Various small fixes and a big merge
  with sparc64.
- Change HZ to 1000
- Merge some of the 2.5.43/i386 profiling changes. No full oprofile yet.
- Fix many warnings
- Update defconfig
- Various other smaller cleanups and bugfixes.

        * switched to private queues
        * set ->queue

into home.transmeta.com:/home/torvalds/v2.5/linux

        * switched to private queues
        * set ->queue and ->private_data
        * switched to use of ->bd_disk/->rq_disk
        * merged private blocksize, etc. arrays into nbd_dev[]
        * cleaned up

        * switched to private queues
        * set ->queue and ->private_data
	* switched to use of ->rq_disk

	sbpcd.c: removes bogus duplicate definition of sbpcd_lock, use of
CURRENT (we are using private queue) and call of invalidate_buffers() in
->media_changed() (caller does it itself).  That went in a changeset from
davej - looks like a merge problem...
	sr.c: braino in ifdefed printk - s/disk/cd->disk/.  Thanks to jejb
for spotting that one...

into home.transmeta.com:/home/torvalds/v2.5/linux

into home.transmeta.com:/home/torvalds/v2.5/linux

into nuts.ninka.net:/home/davem/src/BK/sparc-2.5

This adds a set of list macros that make handling of list protected
by RCU simpler. The interfaces added are -

list_add_rcu
list_add_tail_rcu
	- Adds an element by taking care of memory barrier (wmb()).

list_del_rcu
	- Deletes an element but doesn't re-initialize the pointers in
	  the element for supporting RCU based traversal.

list_for_each_rcu
__list_for_each_rcu
	- Traversal of RCU protected list - takes care of memory barriers
	  transparently.

This first RCU helper patch adds a read_barrier_depends() primitive
to all archs which is NOP for archs that doesn't require an rmb()
for data dependent reads when writes are ordered using a wmb().
In reality, only alpha requires an rmb(), the rest are NOPs.
It is likely to be necessary in most situations that would use RCU.
Please apply.

 Description :

Sometime ago, during a discussion on lock-free lookups, it was
agreed that an additional memory barrier interface,
read_barrier_depends() that is lighter than an rmb(),
is necessary to make sure that data-dependent reads are not
re-ordered over this barrier. For many processors, data-dependency
enforces order, so this interface is a NOP, but for those that don't
(like alpha), it can be a rmb().

For example, the following code would force ordering (the initial
value of "a" is zero, "b" is one, and "p" is "&a"):

    CPU 0                           CPU 1

    b = 2;
    memory_barrier();
    p = &b;                         q = p;
                                    read_barrier_depends();
                                    d = *q;

because the read of "*q" depends on the read of "p" and these
two reads should be separated by a read_barrier_depends().  However,
the following code, with the same initial values for "a" and "b":

    CPU 0                           CPU 1

    a = 2;
    memory_barrier();
    b = 3;                          y = b;
                                    read_barrier_depends();
                                    x = a;

does not enforce ordering, since there is no data dependency between
the read of "a" and the read of "b".  Therefore, on some CPUs, such
as Alpha, "y" could be set to 3 and "x" to 0.  rmb()
needs to be used here, not read_barrier_depends().

The original discussion can be found at -
http://marc.theaimsgroup.com/?t=100259422200002&r=1&w=2

Explanation of the need for read_barrier_depends()
can be found at http://lse.sf.net/locking/wmbdd.html