NeilBrown 70fffd0bfa md: Don't update ->recovery_offset when reshaping an array to fewer devices. ... When an array is reshaped to have fewer devices, the reshape proceeds from the end of the devices to the beginning. If a device happens to be non-In_sync (which is possible but rare) we would normally update the ->recovery_offset as the reshape progresses. However that would be wrong as the recover_offset records that the early part of the device is in_sync, while in fact it would only be the later part that is in_sync, and in any case the offset number would be measured from the wrong end of the device. Relatedly, if after a reshape a spare is discovered to not be recoverred all the way to the end, not allow spare_active to incorporate it in the array. This becomes relevant in the following sample scenario: A 4 drive RAID5 is converted to a 6 drive RAID6 in a combined operation. The RAID5->RAID6 conversion will cause a 5 drive to be included as a spare, then the 5drive -> 6drive reshape will effectively rebuild that spare as it progresses. The 6th drive is treated as in_sync the whole time as there is never any case that we might consider reading from it, but must not because there is no valid data. If we interrupt this reshape part-way through and reverse it to return to a 5-drive RAID6 (or event a 4-drive RAID5), we don't want to update the recovery_offset - as that would be wrong - and we don't want to include that spare as active in the 5-drive RAID6 when the reversed reshape completed and it will be mostly out-of-sync still. Signed-off-by: NeilBrown <neilb@suse.de>		2010-06-24 13:35:18 +10:00
..
raid6test	md: drivers/md/unroll.pl replaced with awk analog	2009-10-16 16:25:19 +11:00
.gitignore	gitignore: misc files	2006-01-01 22:21:50 +01:00
bitmap.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6	2010-05-21 19:37:45 -07:00
bitmap.h	md/raid1: delay reads that could overtake behind-writes.	2010-05-18 15:27:57 +10:00
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	Merge commit '3ff195b011d7decf501a4d55aeed312731094796' into for-linus	2010-05-22 08:31:36 +10:00
Kconfig	md: remove EXPERIMENTAL designation from RAID10	2010-05-18 15:27:58 +10:00
linear.c	Merge commit '3ff195b011d7decf501a4d55aeed312731094796' into for-linus	2010-05-22 08:31:36 +10:00
linear.h	md/linear: use call_rcu to free obsolete 'conf' structures.	2009-06-18 08:49:42 +10:00
Makefile	md: drivers/md/unroll.pl replaced with awk analog	2009-10-16 16:25:19 +11:00
md.c	md: Don't update ->recovery_offset when reshaping an array to fewer devices.	2010-06-24 13:35:18 +10:00
md.h	md: fix handling of array level takeover that re-arranges devices.	2010-06-24 13:33:24 +10:00
mktables.c	md/raid6: move raid6 data processing to raid6_pq.ko	2009-03-31 15:09:39 +11:00
multipath.c	Merge commit '3ff195b011d7decf501a4d55aeed312731094796' into for-linus	2010-05-22 08:31:36 +10:00
multipath.h	md: remove mddev_to_conf "helper" macro	2009-06-16 16:54:21 +10:00
raid0.c	md: enable raid4->raid0 takeover	2010-06-24 13:34:57 +10:00
raid0.h	md: fix handling of array level takeover that re-arranges devices.	2010-06-24 13:33:24 +10:00
raid1.c	Merge commit '3ff195b011d7decf501a4d55aeed312731094796' into for-linus	2010-05-22 08:31:36 +10:00
raid1.h	md/raid1: add takeover support for raid5->raid1	2009-12-14 12:51:41 +11:00
raid5.c	md: Don't update ->recovery_offset when reshaping an array to fewer devices.	2010-06-24 13:35:18 +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	md: fix raid10 takeover: use new_layout for setup_conf	2010-06-24 13:33:51 +10:00
raid10.h	md: fix handling of array level takeover that re-arranges devices.	2010-06-24 13:33:24 +10:00
unroll.awk	md: drivers/md/unroll.pl replaced with awk analog	2009-10-16 16:25:19 +11:00