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[PATCH] cfq-iosched: fix problem with barriers and max_depth == 1
authorJens Axboe <axboe@suse.de>
Tue, 2 Aug 2005 18:08:02 +0000 (20:08 +0200)
committerLinus Torvalds <torvalds@g5.osdl.org>
Tue, 2 Aug 2005 18:19:18 +0000 (11:19 -0700)
commitd7ed538a02c219119adb20f1dccbf0f8015e53f3
treed716ae7dc2e986b36c8180333839312dc0eab7e2tree | snapshot
parentf7c80c9f77b0e8a59a19506fd3caf323408a5166commit | diff
[PATCH] cfq-iosched: fix problem with barriers and max_depth == 1

CFQ will currently stall when using write barriers and the default
max_depth setting of 1, since we artificially need a depth of 2 when
pre-pending the first flush. So never deny the barrier request going to
the device.

This is a regression since 2.6.12, it was found in SUSE testing.

Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
drivers/block/cfq-iosched.c diff | blob | history
Domain: System / Kernel;