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kernel_optimize_test/drivers/block/paride
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Tejun Heo 9934c8c045 block: implement and enforce request peek/start/fetch 
Till now block layer allowed two separate modes of request execution.
A request is always acquired from the request queue via
elv_next_request().  After that, drivers are free to either dequeue it
or process it without dequeueing.  Dequeue allows elv_next_request()
to return the next request so that multiple requests can be in flight.

Executing requests without dequeueing has its merits mostly in
allowing drivers for simpler devices which can't do sg to deal with
segments only without considering request boundary.  However, the
benefit this brings is dubious and declining while the cost of the API
ambiguity is increasing.  Segment based drivers are usually for very
old or limited devices and as converting to dequeueing model isn't
difficult, it doesn't justify the API overhead it puts on block layer
and its more modern users.

Previous patches converted all block low level drivers to dequeueing
model.  This patch completes the API transition by...

* renaming elv_next_request() to blk_peek_request()

* renaming blkdev_dequeue_request() to blk_start_request()

* adding blk_fetch_request() which is combination of peek and start

* disallowing completion of queued (not started) requests

* applying new API to all LLDs

Renamings are for consistency and to break out of tree code so that
it's apparent that out of tree drivers need updating.

[ Impact: block request issue API cleanup, no functional change ]

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Mike Miller <mike.miller@hp.com>
Cc: unsik Kim <donari75@gmail.com>
Cc: Paul Clements <paul.clements@steeleye.com>
Cc: Tim Waugh <tim@cyberelk.net>
Cc: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Laurent Vivier <Laurent@lvivier.info>
Cc: Jeff Garzik <jgarzik@pobox.com>
Cc: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Adrian McMenamin <adrian@mcmen.demon.co.uk>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Cc: Borislav Petkov <petkovbb@googlemail.com>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: Alex Dubov <oakad@yahoo.com>
Cc: Pierre Ossman <drzeus@drzeus.cx>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Markus Lidel <Markus.Lidel@shadowconnect.com>
Cc: Stefan Weinhuber <wein@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Pete Zaitcev <zaitcev@redhat.com>
Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-05-11 09:52:18 +02:00
..
aten.c [PATCH] paride_register(): shuffle return values 2006-12-07 08:39:33 -08:00
bpck6.c [PATCH] paride: remove parport #ifdef's 2006-12-07 08:39:45 -08:00
bpck.c [PATCH] paride_register(): shuffle return values 2006-12-07 08:39:33 -08:00
comm.c [PATCH] paride_register(): shuffle return values 2006-12-07 08:39:33 -08:00
dstr.c [PATCH] paride_register(): shuffle return values 2006-12-07 08:39:33 -08:00
epat.c [PATCH] paride_register(): shuffle return values 2006-12-07 08:39:33 -08:00
epia.c [PATCH] paride_register(): shuffle return values 2006-12-07 08:39:33 -08:00
fit2.c [PATCH] paride_register(): shuffle return values 2006-12-07 08:39:33 -08:00
fit3.c [PATCH] paride_register(): shuffle return values 2006-12-07 08:39:33 -08:00
friq.c [PATCH] paride_register(): shuffle return values 2006-12-07 08:39:33 -08:00
frpw.c [PATCH] paride_register(): shuffle return values 2006-12-07 08:39:33 -08:00
kbic.c [PATCH] paride_register(): shuffle return values 2006-12-07 08:39:33 -08:00
Kconfig [PATCH] Remove unused kernel config option PARIDE_PARPORT 2007-02-11 11:18:06 -08:00
ktti.c [PATCH] paride_register(): shuffle return values 2006-12-07 08:39:33 -08:00
Makefile
mkd
on20.c [PATCH] paride_register(): shuffle return values 2006-12-07 08:39:33 -08:00
on26.c [PATCH] paride_register(): shuffle return values 2006-12-07 08:39:33 -08:00
paride.c [PATCH] paride: remove parport #ifdef's 2006-12-07 08:39:45 -08:00
paride.h [PATCH] paride: rename pi_register() and pi_unregister() 2006-12-07 08:39:33 -08:00
pcd.c block: implement and enforce request peek/start/fetch 2009-05-11 09:52:18 +02:00
pd.c block: implement and enforce request peek/start/fetch 2009-05-11 09:52:18 +02:00
pf.c block: implement and enforce request peek/start/fetch 2009-05-11 09:52:18 +02:00
pg.c paride/pg.c: xs(): &&/|| confusion 2009-02-18 10:32:01 +01:00
ppc6lnx.c
pseudo.h WorkStruct: make allyesconfig 2006-11-22 14:57:56 +00:00
pt.c [PATCH] introduce fmode_t, do annotations 2008-10-21 07:47:06 -04:00
Transition-notes