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Tejun Heo e804ac780e md: fix and update workqueue usage 
Workqueue usage in md has two problems.

* Flush can be used during or depended upon by memory reclaim, but md
  uses the system workqueue for flush_work which may lead to deadlock.

* md depends on flush_scheduled_work() to achieve exclusion against
  completion of removal of previous instances.  flush_scheduled_work()
  may incur unexpected amount of delay and is scheduled to be removed.

This patch adds two workqueues to md - md_wq and md_misc_wq.  The
former is guaranteed to make forward progress under memory pressure
and serves flush_work.  The latter serves as the flush domain for
other works.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: NeilBrown <neilb@suse.de>
 		2010-10-28 17:32:29 +11:00
..
Kconfig Merge branch 'async' of macbook:git/btrfs-unstable 2010-08-09 10:36:44 +01:00
Makefile Merge branch 'async' of macbook:git/btrfs-unstable 2010-08-09 10:36:44 +01:00
bitmap.c md: use sector_t in bitmap_get_counter 2010-10-28 17:32:26 +11:00
bitmap.h md: use sector_t in bitmap_get_counter 2010-10-28 17:32:26 +11:00
dm-bio-record.h
…
dm-crypt.c dm: implement REQ_FLUSH/FUA support for bio-based dm 2010-09-10 12:35:38 +02:00
dm-delay.c dm delay: support discard 2010-08-12 04:14:13 +01:00
dm-exception-store.c dm snapshot: test chunk size against both origin and snapshot 2010-08-12 04:13:51 +01:00
dm-exception-store.h dm snapshot: test chunk size against both origin and snapshot 2010-08-12 04:13:51 +01:00
dm-io.c dm: implement REQ_FLUSH/FUA support for bio-based dm 2010-09-10 12:35:38 +02:00
dm-ioctl.c llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00
dm-kcopyd.c block: unify flags for struct bio and struct request 2010-08-07 18:20:39 +02:00
dm-linear.c dm: use dm_target_offset macro 2010-08-12 04:14:11 +01:00
dm-log-userspace-base.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
dm-log-userspace-transfer.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
dm-log-userspace-transfer.h dm log: userspace add luid to distinguish between concurrent log instances 2009-09-04 20:40:34 +01:00
dm-log.c dm: implement REQ_FLUSH/FUA support for bio-based dm 2010-09-10 12:35:38 +02:00
dm-mpath.c dm mpath: support discard 2010-08-12 04:14:32 +01:00
dm-mpath.h
…
dm-path-selector.c
…
dm-path-selector.h dm mpath: add start_io and nr_bytes to path selectors 2009-06-22 10:12:27 +01:00
dm-queue-length.c dm mpath: add queue length load balancer 2009-06-22 10:12:27 +01:00
dm-raid1.c dm: implement REQ_FLUSH/FUA support for bio-based dm 2010-09-10 12:35:38 +02:00
dm-region-hash.c dm: implement REQ_FLUSH/FUA support for bio-based dm 2010-09-10 12:35:38 +02:00
dm-round-robin.c dm mpath: add start_io and nr_bytes to path selectors 2009-06-22 10:12:27 +01:00
dm-service-time.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
dm-snap-persistent.c workqueues: s/ON_STACK/ONSTACK/ 2010-10-26 16:52:14 -07:00
dm-snap-transient.c dm snapshot: move cow ref from exception store to snap core 2009-12-10 23:52:12 +00:00
dm-snap.c Merge branch 'for-2.6.37/barrier' of git://git.kernel.dk/linux-2.6-block 2010-10-22 17:07:18 -07:00
dm-stripe.c dm: implement REQ_FLUSH/FUA support for bio-based dm 2010-09-10 12:35:38 +02:00
dm-sysfs.c Driver core: Constify struct sysfs_ops in struct kobj_type 2010-03-07 17:04:49 -08:00
dm-table.c Consolidate min_not_zero 2010-09-10 20:07:38 +02:00
dm-target.c dm: error return error for discards 2010-08-12 04:14:14 +01:00
dm-uevent.c dm table: remove dm_get from dm_table_get_md 2010-03-06 02:29:52 +00:00
dm-uevent.h
…
dm-zero.c dm: zero silently drop discards 2010-08-12 04:14:12 +01:00
dm.c Merge branch 'for-2.6.37/barrier' of git://git.kernel.dk/linux-2.6-block 2010-10-22 17:07:18 -07:00
dm.h dm: linear support discard 2010-08-12 04:14:08 +01:00
faulty.c Merge commit '3ff195b011d7decf501a4d55aeed312731094796' into for-linus 2010-05-22 08:31:36 +10:00
linear.c md: implment REQ_FLUSH/FUA support 2010-09-10 12:35:38 +02:00
linear.h md/linear: use call_rcu to free obsolete 'conf' structures. 2009-06-18 08:49:42 +10:00
md.c md: fix and update workqueue usage 2010-10-28 17:32:29 +11:00
md.h Merge branch 'v2.6.36-rc8' into for-2.6.37/barrier 2010-10-19 09:13:04 +02:00
multipath.c md: implment REQ_FLUSH/FUA support 2010-09-10 12:35:38 +02:00
multipath.h md: remove mddev_to_conf "helper" macro 2009-06-16 16:54:21 +10:00
raid0.c md: implment REQ_FLUSH/FUA support 2010-09-10 12:35:38 +02:00
raid0.h md: fix handling of array level takeover that re-arranges devices. 2010-06-24 13:33:24 +10:00
raid1.c md: use sector_t in bitmap_get_counter 2010-10-28 17:32:26 +11:00
raid1.h md: implment REQ_FLUSH/FUA support 2010-09-10 12:35:38 +02:00
raid5.c md: use sector_t in bitmap_get_counter 2010-10-28 17:32:26 +11:00
raid5.h md: implment REQ_FLUSH/FUA support 2010-09-10 12:35:38 +02:00
raid10.c md: use sector_t in bitmap_get_counter 2010-10-28 17:32:26 +11:00
raid10.h md: fix handling of array level takeover that re-arranges devices. 2010-06-24 13:33:24 +10:00