Krzysztof Wojcik 02214dc546 FIX: md: process hangs at wait_barrier after 0->10 takeover ... Following symptoms were observed: 1. After raid0->raid10 takeover operation we have array with 2 missing disks. When we add disk for rebuild, recovery process starts as expected but it does not finish- it stops at about 90%, md126_resync process hangs in "D" state. 2. Similar behavior is when we have mounted raid0 array and we execute takeover to raid10. After this when we try to unmount array- it causes process umount hangs in "D" In scenarios above processes hang at the same function- wait_barrier in raid10.c. Process waits in macro "wait_event_lock_irq" until the "!conf->barrier" condition will be true. In scenarios above it never happens. Reason was that at the end of level_store, after calling pers->run, we call mddev_resume. This calls pers->quiesce(mddev, 0) with RAID10, that calls lower_barrier. However raise_barrier hadn't been called on that 'conf' yet, so conf->barrier becomes negative, which is bad. This patch introduces setting conf->barrier=1 after takeover operation. It prevents to become barrier negative after call lower_barrier(). Signed-off-by: Krzysztof Wojcik <krzysztof.wojcik@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>		2011-02-08 11:49:02 +11:00
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bitmap.c
bitmap.h
dm-bio-record.h
dm-crypt.c
dm-delay.c
dm-exception-store.c
dm-exception-store.h
dm-io.c
dm-ioctl.c
dm-kcopyd.c
dm-linear.c
dm-log-userspace-base.c
dm-log-userspace-transfer.c
dm-log-userspace-transfer.h
dm-log.c
dm-mpath.c
dm-mpath.h
dm-path-selector.c
dm-path-selector.h
dm-queue-length.c
dm-raid.c
dm-raid1.c
dm-region-hash.c
dm-round-robin.c
dm-service-time.c
dm-snap-persistent.c
dm-snap-transient.c
dm-snap.c
dm-stripe.c
dm-sysfs.c
dm-table.c	block: restore multiple bd_link_disk_holder() support	2011-01-14 18:44:22 +01:00
dm-target.c
dm-uevent.c
dm-uevent.h
dm-zero.c
dm.c
dm.h
faulty.c
Kconfig
linear.c
linear.h
Makefile
md.c	md_make_request: don't touch the bio after calling make_request	2011-02-08 09:53:28 +11:00
md.h	md: Remove the AllReserved flag for component devices.	2011-01-31 12:10:09 +11:00
multipath.c
multipath.h
raid1.c
raid1.h
raid5.c	md: don't abort checking spares as soon as one cannot be added.	2011-01-31 11:57:43 +11:00
raid5.h
raid10.c	FIX: md: process hangs at wait_barrier after 0->10 takeover	2011-02-08 11:49:02 +11:00
raid10.h
raid0.c	Add raid1->raid0 takeover support	2011-01-31 13:47:13 +11:00
raid0.h