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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>		16 years ago
..
drivers	block: implement and enforce request peek/start/fetch	16 years ago
include	Merge branch 'tracing/core-v2' into tracing-for-linus	16 years ago
kernel	clocksource: pass clocksource to read() callback	16 years ago
os-Linux	uml: improve error messages	16 years ago
scripts	uml: throw out CONFIG_MODE_TT	18 years ago
sys-i386	uml: fix link error from prefixing of i386 syscalls with ptregs_	16 years ago
sys-ia64	uml: remove useless comments	16 years ago
sys-ppc	uml: remove useless comments	16 years ago
sys-x86_64	uml: remove useless comments	16 years ago
Kconfig.char	sound: make OSS sound core optional	17 years ago
Kconfig.common	x86, um: get rid of arch/um/Kconfig.arch	17 years ago
Kconfig.debug	uml: GPROF needs to depend on FRAME_POINTER	17 years ago
Kconfig.net	uml: fix URLs in Kconfig and help strings	17 years ago
Kconfig.rest	uml: kill a kconfig warning	16 years ago
Kconfig.um	x86, um: get rid of arch/um/Kconfig.arch	17 years ago
Kconfig.x86	x86, um: get rid of arch/um/Kconfig.arch	17 years ago
Makefile	get rid of the last symlink in uml build	16 years ago
Makefile-i386	[UML] fix gcc ICEs and unresolved externs	17 years ago
Makefile-ia64	…
Makefile-os-Linux	x86, um: get rid of arch/um/os symlink	17 years ago
Makefile-ppc	…
Makefile-skas	…
Makefile-x86_64	[UML] fix gcc ICEs and unresolved externs	17 years ago
defconfig	UML: update defconfig	17 years ago