NeilBrown 4e78064f42 md: Fix possible deadlock with multiple mempool allocations. ... It is not safe to allocate from a mempool while holding an item previously allocated from that mempool as that can deadlock when the mempool is close to exhaustion. So don't use a bio list to collect the bios to write to multiple devices in raid1 and raid10. Instead queue each bio as it becomes available so an unplug will activate all previously allocated bios and so a new bio has a chance of being allocated. This means we must set the 'remaining' count to '1' before submitting any requests, then when all are submitted, decrement 'remaining' and possible handle the write completion at that point. Reported-by: Torsten Kaiser <just.for.lkml@googlemail.com> Tested-by: Torsten Kaiser <just.for.lkml@googlemail.com> Signed-off-by: NeilBrown <neilb@suse.de>		2010-10-28 17:34:07 +11:00
..
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
Kconfig	Merge branch 'async' of macbook:git/btrfs-unstable	2010-08-09 10:36:44 +01:00
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
Makefile	Merge branch 'async' of macbook:git/btrfs-unstable	2010-08-09 10:36:44 +01:00
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: Fix possible deadlock with multiple mempool allocations.	2010-10-28 17:34:07 +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: Fix possible deadlock with multiple mempool allocations.	2010-10-28 17:34:07 +11:00
raid10.h	md: fix handling of array level takeover that re-arranges devices.	2010-06-24 13:33:24 +10:00