Tejun Heo 80fd99792b blkcg: make sure blkg_lookup() returns %NULL if @q is bypassing ... Currently, blkg_lookup() doesn't check @q bypass state. This patch updates blk_queue_bypass_start() to do synchronize_rcu() before returning and updates blkg_lookup() to check blk_queue_bypass() and return %NULL if bypassing. This ensures blkg_lookup() returns %NULL if @q is bypassing. This is to guarantee that nobody is accessing policy data while @q is bypassing, which is necessary to allow replacing blkio_cgroup->pd[] in place on policy [de]activation. v2: Added more comments explaining bypass guarantees as suggested by Vivek. v3: Added more comments explaining why there's no synchronize_rcu() in blk_cleanup_queue() as suggested by Vivek. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>		2012-04-20 10:06:06 +02:00
..
partitions	LDM: Fix reassembly of extended VBLKs.	2012-02-24 09:37:42 +00:00
blk-cgroup.c	blkcg: make sure blkg_lookup() returns %NULL if @q is bypassing	2012-04-20 10:06:06 +02:00
blk-cgroup.h	blkcg: make blkg_conf_prep() take @pol and return with queue lock held	2012-04-20 10:06:06 +02:00
blk-core.c	blkcg: make sure blkg_lookup() returns %NULL if @q is bypassing	2012-04-20 10:06:06 +02:00
blk-exec.c	block: add missing blk_queue_dead() checks	2011-12-14 00:33:37 +01:00
blk-flush.c	blk-flush: move the queue kick into	2011-10-24 16:24:31 +02:00
blk-integrity.c	block: add export.h to files using EXPORT_SYMBOL/THIS_MODULE macros	2011-10-31 19:31:12 -04:00
blk-ioc.c	Merge branch 'for-3.5' of ../cgroup into block/for-3.5/core-merged	2012-04-01 12:55:00 -07:00
blk-iopoll.c
blk-lib.c	block: fix patch import error in max_discard_sectors check	2011-07-23 20:34:59 +02:00
blk-map.c	block: re-use existing 'reading' variable instead of checking direction again	2011-12-21 15:27:24 +01:00
blk-merge.c	block: separate out blk_rq_merge_ok() and blk_try_merge() from elevator functions	2012-02-08 09:19:38 +01:00
blk-settings.c	block: Introduce blk_set_stacking_limits function	2012-01-11 16:27:11 +01:00
blk-softirq.c	sched, block: Unify cache detection	2012-01-27 13:28:48 +01:00
blk-sysfs.c	blkcg: unify blkg's for blkcg policies	2012-03-06 21:27:23 +01:00
blk-tag.c	block: fix blk_queue_end_tag()	2011-12-29 09:16:28 +01:00
blk-throttle.c	blkcg: make blkg_conf_prep() take @pol and return with queue lock held	2012-04-20 10:06:06 +02:00
blk-timeout.c	fault-injection: add ability to export fault_attr in arbitrary directory	2011-08-03 14:25:20 -10:00
blk.h	Merge branch 'for-3.5' of ../cgroup into block/for-3.5/core-merged	2012-04-01 12:55:00 -07:00
bsg-lib.c	block: Change module.h -> export.h in bsg-lib.c	2011-10-31 19:31:13 -04:00
bsg.c	bsg: fix sysfs link remove warning	2012-02-08 20:02:03 +01:00
cfq-iosched.c	blkcg: make blkg_conf_prep() take @pol and return with queue lock held	2012-04-20 10:06:06 +02:00
compat_ioctl.c	block: Add BLKROTATIONAL ioctl	2012-01-11 16:29:31 +01:00
deadline-iosched.c	elevator: make elevator_init_fn() return 0/-errno	2012-03-06 21:27:21 +01:00
elevator.c	block: implement bio_associate_current()	2012-03-06 21:27:24 +01:00
genhd.c	Block: use a freezable workqueue for disk-event polling	2012-03-02 10:51:00 +01:00
ioctl.c	Merge branch 'for-3.3/core' of git://git.kernel.dk/linux-block	2012-01-15 12:24:45 -08:00
Kconfig	move fs/partitions to block/	2012-01-03 22:54:06 -05:00
Kconfig.iosched	blkcg: make CONFIG_BLK_CGROUP bool	2012-03-06 21:27:21 +01:00
Makefile	separate partition format handling from generic code	2012-01-03 22:54:06 -05:00
noop-iosched.c	elevator: make elevator_init_fn() return 0/-errno	2012-03-06 21:27:21 +01:00
partition-generic.c	block: Fix NULL pointer dereference in sd_revalidate_disk	2012-03-02 10:38:33 +01:00
scsi_ioctl.c	block: fail SCSI passthrough ioctls on partition devices	2012-01-14 15:07:24 -08:00