In two cases (AIO-for-direct-IO and some CDROM DMA stuff which Jens
did), we need to run set_page_dirty() in interrupt context.  After DMA
hardware has altered userspace pages for direct-IO reads.

But mapping->page_lock, mapping->private_lock and inode_lock are not
irq-safe.  And really, we don't want to convert those locks just for this
problem.

So what we do is to dirty the pages *before* starting I/O.  Then, in
interrupt completion context, check to see that they are still dirty.
If so then there is nothing to do.  But if the pages were cleaned while
the direct-IO is in progress we need to redirty them.  The code uses
schedule_work() for that.

Of course, we could use schedule_work() for all BIOs and pages.  The
speculative dirty-before-starting-IO is just an optimisation.  It's
quite unlikely that any of the pages will be cleaned during the direct
IO.


This code is basically untestable under normal circumstances, because the
relevant pages are pinned via get_user_pages().  This makes
is_page_cache_freeable() evaluate false and the VM doesn't try to write them
out anyway.  But if the pages happen to be MAP_SHARED file pages, pdflush
could clean them.  The way I tested this code was to disable the call to
bio_set_pages_dirty() in fs/direct-io.c.

Patch from Badari Pulavarty <pbadari@us.ibm.com> and myself

This patch adds the infrastructure for performing asynchronous (AIO) blockdev
direct-IO.

- Adds generic_file_aio_write_nolock() and make other
  generic_file_*_write() to use it.

- Modify generic_file_direct_IO() and ->direct_IO() functions to take
  "kiocb *" instead of "file *".

- Renames generic_direct_IO() to blockdev_direct_IO().

- Move generic_file_direct_IO() to mm/filemap.c (it is not
  blockdev-specific, whereas the rest of fs/direct-io.c is).

- Add AIO read/write support to the raw driver.

If direct-io encounters an error, it currently returns that error even if it
performed some I/O.

Change it so that if there is an error and we read or wrote something, return
the number of bytes written/read.  Only return the error code if zero bytes
were written/read.

We need to run exit_aio() when the final user of the mm goes away, else lots
of things leak.

Also remove a printk which comes out when this change is made.

This patch was acked by bcrl.

The patch below is large but trivial:

It removes old #if'd compatiblity code for 2.0 kernels from
drivers/char/ftape/* (this includes the removal of two header files
including only compatibility code and the #include's of these files).

	o Correct memory mapped I/O test for legacy controllers
	  that do not have the "auto-access-pause" feature.
	o Prevent NMIs from triggering should the MMAP I/O test fail.
	o Fix aic7770 (EISA/VLB) controller regression.
	o Kill a few compiler warnings.

 o Do not fallback to a wide speed if the device does not support
   wide transfers.

 o Don't bother allocating target instances for wide IDs on narrow
   controllers.

 o Add a few additional diagnostics to aid in tracking down DV bugs.

   Remove the numerical_value portion of the grammer which is no
   longer referenced.  This eliminates a yacc warning.

are not rebuilt on every build.

Use better Kbuild rule style for building firmware.

Submitted by: Sam Ravnborg <sam@ravnborg.org>

Add a missing inline, shows up when modules are turned off.

This is only used by pci hotplug and cardbus systems.

into penguin.transmeta.com:/home/penguin/torvalds/repositories/kernel/linux

into penguin.transmeta.com:/home/penguin/torvalds/repositories/kernel/linux

into kernel.bkbits.net:/home/davem/net-2.5

into kernel.bkbits.net:/home/davem/sparc-2.5

into penguin.transmeta.com:/home/penguin/torvalds/repositories/kernel/linux

OK, the grand finale ... NUMA-Q is now moved into subarch, so we can
kill off the last vestiges - CONFIG_CLUSTERED_APIC, clustered_apic_mode,
and smpboot.h (which only contains machine specific stuff now anyway).
the esr_disable switch was the last bit, that goes to subarch too.

If you end up with an empty smpboot.h due to patch / bitkeeper interactions,
please remove it after this ...

This removes clustered_apic_mode from smpboot.c into subarch,
creating a headerfile "mach_wakecpu" for all the cpu wakeup stuff.
This is pretty much the last of clustered_apic_mode ... ;-)

To be honest, I have no idea what I was smoking when I wrote this
originally, and it's kind of coincidental that it works at all currently.

We never use physical apicids after the cpus are all booted, so we should
just store the logical IDs which all subsequent things use. The only things
that were using the apicid->cpu mapping were hokey anyway, and it's hard to
maintain for machines that have a large apic addressing space (eg P4s
in clustered mode). Rips out everything except the mapping from
logical_apic_id -> cpu.

Moves check_phys_apicid_present() into subarch, and cleans up a
couple of stupid errors, and some bracketing issues in the macros.

Patch from James Cleverdon

Changes do_boot_cpu to return an error code, instead of trying to
work it out later by magic and voodoo. Removes the other usage
of apicid->cpu which is hard to maintain cleanly.

Patch originally by Matt Dobson. Reworked a little by me.

Stores the mappings between cpus and nodes in an array, instead of
working them out every time. Gives about 4% off systime for kernel
compile (we use these for every page allocation), and removes one
of the two only usages of apicid->cpu mapping, which is really awkward
to keep for systems with large apic spaces, and is genererally pretty
useless anyway (later patch removes).

Create a generalised apicid_to_node mapping, replacing the local
apicid_to_quad I had just locally in NUMA-Q subarch before.

into penguin.transmeta.com:/home/penguin/torvalds/repositories/kernel/linux

This simply uses generic_file_aio_read and generic_file_aio_write

into shaggy.austin.ibm.com:/shaggy/bk/jfs-2.5

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

into osdl.org:/home/mochel/src/kernel/devel/linux-2.5-core

into osdl.org:/home/mochel/src/kernel/devel/linux-2.5-virgin

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

Make x86-64 compile again after recent extable changes.

Micheal Meeks notes:

	"Evolution is non-functioning on recent 2.5.X kernels, due to
    mal-performance in getpeername => net/unix/af_unix.c (unix_getname),
    where it seems we switch 'sk' on 'peer', but not the (previously)
    typecast pointer to it; this fixes it."

Whitespace fixes by Ray Lee.

and stop honoring the SA_RESTORER information.

This will prepare us for alternate signal handler returns.