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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
..
Kconfig	…
Makefile	…
dasd.c	block: implement and enforce request peek/start/fetch	16 years ago
dasd_3990_erp.c	[S390] dasd: message cleanup	16 years ago
dasd_alias.c	[S390] dasd: message cleanup	16 years ago
dasd_devmap.c	[S390] dasd: message cleanup	16 years ago
dasd_diag.c	block: convert to pos and nr_sectors accessors	16 years ago
dasd_diag.h	…
dasd_eckd.c	block: convert to pos and nr_sectors accessors	16 years ago
dasd_eckd.h	[S390] dasd: add High Performance FICON support	16 years ago
dasd_eer.c	[S390] dasd: message cleanup	16 years ago
dasd_erp.c	[S390] dasd: message cleanup	16 years ago
dasd_fba.c	block: convert to pos and nr_sectors accessors	16 years ago
dasd_fba.h	…
dasd_genhd.c	[S390] dasd: message cleanup	16 years ago
dasd_int.h	[S390] dasd: message cleanup	16 years ago
dasd_ioctl.c	[S390] dasd: message cleanup	16 years ago
dasd_proc.c	proc 2/2: remove struct proc_dir_entry::owner	16 years ago
dcssblk.c	s390: remove s390_root_dev_*()	16 years ago
xpram.c	[S390] convert xpram printks to pr_xxx macros.	16 years ago