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fbbf055692
linux/block
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Christoph Hellwig fbbf055692 block: fix DISCARD_BARRIER requests 
Filesystems assume that DISCARD_BARRIER are full barriers, so that they
don't have to track in-progress discard operation when submitting new I/O.
But currently we only treat them as elevator barriers, which don't
actually do the nessecary queue drains.

Also remove the unlikely around both the DISCARD and BARRIER requests -
the happen far too often for a static mispredict.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-06-17 10:10:53 +02:00
..
blk-barrier.c blkdev: move blkdev_issue helper functions to separate file 2010-04-28 19:47:36 +02:00
blk-cgroup.c Merge branch 'master' into for-2.6.35 2010-05-21 21:27:26 +02:00
blk-cgroup.h blk-cgroup: config options re-arrangement 2010-04-26 19:27:56 +02:00
blk-core.c block: fix DISCARD_BARRIER requests 2010-06-17 10:10:53 +02:00
blk-exec.c block: don't set REQ_NOMERGE unnecessarily 2009-04-28 07:37:33 +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: fix bad use of min() on different types 2010-04-29 09:28:21 +02:00
blk-map.c block: Use accessor functions for queue limits 2009-05-22 23:22:54 +02:00
blk-merge.c block: Consolidate phys_segment and hw_segment limits 2010-02-26 13:58:08 +01:00
blk-settings.c Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block 2010-04-09 11:50:29 -07:00
blk-softirq.c generic-ipi: remove CSD_FLAG_WAIT 2009-02-25 14:13:44 +01:00
blk-sysfs.c Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block 2010-04-09 11:50:29 -07:00
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: implement mixed merge of different failfast requests 2009-09-11 14:33:30 +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: fix an oops caused by slab leak 2010-05-25 10:17:26 +02:00
compat_ioctl.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
deadline-iosched.c block: convert to pos and nr_sectors accessors 2009-05-11 09:50:54 +02:00
elevator.c block: make blk_init_free_list and elevator_init idempotent 2010-06-04 13:47:06 +02:00
genhd.c block: remove all rcu head initializations 2010-05-21 20:01:02 +02:00
ioctl.c blkdev: generalize flags for blkdev_issue_fn functions 2010-04-28 19:47:36 +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
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