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Jens Axboe 5dd531a03a block: add function call to switch the IO scheduler from a driver 
Currently drivers must do an elevator_exit() + elevator_init()
to switch IO schedulers. There are a few problems with this:

- Since commit 1abec4fdbb,
  elevator_init() requires a zeroed out q->elevator
  pointer. The two existing in-kernel users don't do that.

- It will only work at initialization time, since using the
  above two-staged construct does not properly quisce the queue.

So add elevator_change() which takes care of this, and convert
the elv_iosched_store() sysfs interface to use this helper as well.

Reported-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Reported-by: Kevin Vigor <kevin@vigor.nu>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
 		2010-08-23 13:52:19 +02:00
..
Kconfig blk-cgroup: config options re-arrangement 2010-04-26 19:27:56 +02:00
Kconfig.iosched blk-cgroup: config options re-arrangement 2010-04-26 19:27:56 +02:00
Makefile blkdev: move blkdev_issue helper functions to separate file 2010-04-28 19:47:36 +02:00
blk-barrier.c block: set up rq->rq_disk properly for flush requests 2010-08-07 18:52:41 +02:00
blk-cgroup.c blkio: Fix return code for mkdir calls 2010-08-23 10:56:30 +02:00
blk-cgroup.h blk-cgroup: config options re-arrangement 2010-04-26 19:27:56 +02:00
blk-core.c BLOCK: fix bio.bi_rw handling 2010-08-23 12:33:10 +02:00
blk-exec.c block: remove wrappers for request type/flags 2010-08-07 18:17:56 +02:00
blk-integrity.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
blk-ioc.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
blk-iopoll.c tree-wide: fix assorted typos all over the place 2009-12-04 15:39:55 +01:00
blk-lib.c block: add secure discard 2010-08-12 08:43:30 -07:00
blk-map.c block: unify flags for struct bio and struct request 2010-08-07 18:20:39 +02:00
blk-merge.c gcc-4.6: block: fix unused but set variables in blk-merge 2010-08-07 18:23:10 +02:00
blk-settings.c block: implement an unprep function corresponding directly to prep 2010-08-07 18:23:47 +02:00
blk-softirq.c generic-ipi: remove CSD_FLAG_WAIT 2009-02-25 14:13:44 +01:00
blk-sysfs.c block: put dev->kobj in blk_register_queue fail path 2010-08-23 12:30:29 +02:00
blk-tag.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
blk-timeout.c block: ensure jiffies wrap is handled correctly in blk_rq_timed_out_timer 2010-04-21 17:42:08 +02:00
blk.h block: remove wrappers for request type/flags 2010-08-07 18:17:56 +02:00
bsg.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
cfq-iosched.c cfq-iosched: blktrace print per slice sector stats 2010-08-23 12:25:03 +02:00
cfq.h cfq: fix recursive call in cfq_blkiocg_update_completion_stats() 2010-06-21 09:10:55 +02:00
compat_ioctl.c block: add secure discard 2010-08-12 08:43:30 -07:00
deadline-iosched.c block: convert to pos and nr_sectors accessors 2009-05-11 09:50:54 +02:00
elevator.c block: add function call to switch the IO scheduler from a driver 2010-08-23 13:52:19 +02:00
genhd.c block: remove all rcu head initializations 2010-05-21 20:01:02 +02:00
ioctl.c block: add secure discard 2010-08-12 08:43:30 -07:00
noop-iosched.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
scsi_ioctl.c block/scsi_ioctl.c: quiet sparse noise 2009-11-04 09:10:33 +01:00