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NeilBrown 1176568de7 md: restore ability of spare drives to spin down. 
Some time ago we stopped the clean/active metadata updates
from being written to a 'spare' device in most cases so that
it could spin down and say spun down.  Device failure/removal
etc are still recorded on spares.

However commit 51d5668cb2 broke this 50% of the time,
depending on whether the event count is even or odd.
The change log entry said:

   This means that the alignment between 'odd/even' and
    'clean/dirty' might take a little longer to attain,

how ever the code makes no attempt to create that alignment, so it
could take arbitrarily long.

So when we find that clean/dirty is not aligned with odd/even,
force a second metadata-update immediately.  There are already cases
where a second metadata-update is needed immediately (e.g. when a
device fails during the metadata update).  We just piggy-back on that.

Reported-by: Joe Bryant <tenminjoe@yahoo.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Cc: stable@kernel.org
 		2010-05-07 21:10:57 +10:00
..
raid6test md: drivers/md/unroll.pl replaced with awk analog 2009-10-16 16:25:19 +11:00
.gitignore
…
Kconfig md: revise Kconfig help for MD_MULTIPATH 2009-12-14 12:51:41 +11:00
Makefile md: drivers/md/unroll.pl replaced with awk analog 2009-10-16 16:25:19 +11:00
bitmap.c md/bitmap: update dirty flag when bitmap bits are explicitly set. 2009-12-14 12:51:41 +11:00
bitmap.h md: Support write-intent bitmaps with externally managed metadata. 2009-12-14 12:51:41 +11:00
dm-bio-record.h dm: preserve bi_io_vec when resubmitting bios 2009-04-02 19:55:23 +01:00
dm-crypt.c dm table: remove unused dm_get_device range parameters 2010-03-06 02:32:27 +00:00
dm-delay.c dm table: remove unused dm_get_device range parameters 2010-03-06 02:32:27 +00:00
dm-exception-store.c dm snapshot: move cow ref from exception store to snap core 2009-12-10 23:52:12 +00:00
dm-exception-store.h dm snapshot: add merging 2009-12-10 23:52:32 +00:00
dm-io.c dm io: handle empty barriers 2009-12-10 23:52:22 +00:00
dm-ioctl.c dm ioctl: introduce flag indicating uevent was generated 2010-03-06 02:32:31 +00:00
dm-kcopyd.c dm kcopyd: accept zero size jobs 2009-12-10 23:52:13 +00:00
dm-linear.c dm table: remove unused dm_get_device range parameters 2010-03-06 02:32:27 +00:00
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 table: remove unused dm_get_device range parameters 2010-03-06 02:32:27 +00:00
dm-mpath.c dm table: remove unused dm_get_device range parameters 2010-03-06 02:32:27 +00:00
dm-mpath.h dm mpath: remove is_active from struct dm_path 2008-10-10 13:36:58 +01:00
dm-path-selector.c dm: path selector use module refcount directly 2009-04-02 19:55:27 +01:00
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 raid1: fix deadlock when suspending failed device 2010-03-06 02:32:35 +00:00
dm-region-hash.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-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 dm snapshot: persistent annotate work_queue as on stack 2010-02-16 18:42:51 +00:00
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 dm: eliminate some holes data structures 2010-03-06 02:32:33 +00:00
dm-stripe.c dm table: remove unused dm_get_device range parameters 2010-03-06 02:32:27 +00:00
dm-sysfs.c Driver core: Constify struct sysfs_ops in struct kobj_type 2010-03-07 17:04:49 -08:00
dm-table.c dm table: remove unused dm_get_device range parameters 2010-03-06 02:32:27 +00:00
dm-target.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-uevent.c dm table: remove dm_get from dm_table_get_md 2010-03-06 02:29:52 +00:00
dm-uevent.h dm: uevent generate events 2007-10-20 02:01:26 +01:00
dm-zero.c dm: consolidate target deregistration error handling 2009-01-06 03:04:58 +00:00
dm.c dm ioctl: introduce flag indicating uevent was generated 2010-03-06 02:32:31 +00:00
dm.h dm ioctl: introduce flag indicating uevent was generated 2010-03-06 02:32:31 +00:00
faulty.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
linear.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
linear.h md/linear: use call_rcu to free obsolete 'conf' structures. 2009-06-18 08:49:42 +10:00
md.c md: restore ability of spare drives to spin down. 2010-05-07 21:10:57 +10:00
md.h raid: improve MD/raid10 handling of correctable read errors. 2009-12-14 12:51:41 +11:00
mktables.c md/raid6: move raid6 data processing to raid6_pq.ko 2009-03-31 15:09:39 +11:00
multipath.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
multipath.h md: remove mddev_to_conf "helper" macro 2009-06-16 16:54:21 +10:00
raid0.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
raid0.h md: remove mddev_to_conf "helper" macro 2009-06-16 16:54:21 +10:00
raid1.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
raid1.h md/raid1: add takeover support for raid5->raid1 2009-12-14 12:51:41 +11:00
raid5.c md/raid6: Fix raid-6 read-error correction in degraded state 2010-05-07 21:10:35 +10:00
raid5.h percpu: add __percpu sparse annotations to what's left 2010-02-17 11:17:38 +09:00
raid6algos.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
raid6altivec.uc md: drivers/md/unroll.pl replaced with awk analog 2009-10-16 16:25:19 +11:00
raid6int.uc md: drivers/md/unroll.pl replaced with awk analog 2009-10-16 16:25:19 +11:00
raid6mmx.c md/raid6: move raid6 data processing to raid6_pq.ko 2009-03-31 15:09:39 +11:00
raid6recov.c md/raid6: move raid6 data processing to raid6_pq.ko 2009-03-31 15:09:39 +11:00
raid6sse1.c md/raid6: move raid6 data processing to raid6_pq.ko 2009-03-31 15:09:39 +11:00
raid6sse2.c md/raid6: move raid6 data processing to raid6_pq.ko 2009-03-31 15:09:39 +11:00
raid6x86.h md: fix typo in FSF address 2009-03-31 14:57:37 +11:00
raid10.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
raid10.h md: remove mddev_to_conf "helper" macro 2009-06-16 16:54:21 +10:00
unroll.awk md: drivers/md/unroll.pl replaced with awk analog 2009-10-16 16:25:19 +11:00