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9eb07c2592
linux/drivers/md
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NeilBrown 9eb07c2592 md: fix 'degraded' calculation when starting a reshape. 
This code was written long ago when it was not possible to
reshape a degraded array.  Now it is so the current level of
degraded-ness needs to be taken in to account.  Also newly addded
devices should only reduce degradedness if they are deemed to be
in-sync.

In particular, if you convert a RAID5 to a RAID6, and increase the
number of devices at the same time, then the 5->6 conversion will
make the array degraded so the current code will produce a wrong
value for 'degraded' - "-1" to be precise.

If the reshape runs to completion end_reshape will calculate a correct
new value for 'degraded', but if a device fails during the reshape an
incorrect decision might be made based on the incorrect value of
"degraded".

This patch is suitable for 2.6.32-stable and if they are still open,
2.6.31-stable and 2.6.30-stable as well.

Cc: stable@kernel.org
Reported-by: Michael Evans <mjevans1983@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
2010-02-09 16:34:29 +11:00
..
raid6test md: drivers/md/unroll.pl replaced with awk analog 2009-10-16 16:25:19 +11:00
.gitignore
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 crypt: add plain64 iv 2009-12-10 23:52:25 +00:00
dm-delay.c dm table: pass correct dev area size to device_area_is_valid 2009-07-23 20:30:42 +01:00
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: rename dm_suspended to dm_suspended_md 2009-12-10 23:52:26 +00:00
dm-kcopyd.c dm kcopyd: accept zero size jobs 2009-12-10 23:52:13 +00:00
dm-linear.c dm table: pass correct dev area size to device_area_is_valid 2009-07-23 20:30:42 +01:00
dm-log-userspace-base.c dm log: userspace fix incorrect luid cast in userspace_ctr 2009-10-16 23:18:15 +01:00
dm-log-userspace-transfer.c dm/connector: Only process connector packages from privileged processes 2009-10-02 10:54:10 -07:00
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 raid1: report flush errors separately in status 2009-12-10 23:52:02 +00:00
dm-mpath.c dm mpath: reject messages when device is suspended 2009-12-10 23:52:27 +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: explicitly initialise bio_lists 2009-12-10 23:52:06 +00:00
dm-region-hash.c dm raid1: remove bio_endio from dm_rh_mark_nosync 2009-12-10 23:52:05 +00:00
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 dm mpath: add service time load balancer 2009-06-22 10:12:28 +01:00
dm-snap-persistent.c dm exception store: add merge specific methods 2009-12-10 23:52:29 +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 snapshot: use merge origin if snapshot invalid 2009-12-10 23:52:36 +00:00
dm-stripe.c block: Optimal I/O limit wrapper 2009-09-14 08:24:52 +02:00
dm-sysfs.c dm: rename dm_suspended to dm_suspended_md 2009-12-10 23:52:26 +00:00
dm-table.c DM: Fix device mapper topology stacking 2010-01-11 14:29:20 +01:00
dm-target.c dm target: remove struct tt_internal 2009-04-02 19:55:28 +01:00
dm-uevent.c dm: avoid _hash_lock deadlock 2009-12-10 23:51:52 +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: export suspended state to targets 2009-12-10 23:52:27 +00:00
dm.h dm: rename dm_suspended to dm_suspended_md 2009-12-10 23:52:26 +00:00
faulty.c md: add MODULE_DESCRIPTION for all md related modules. 2009-12-14 12:51:41 +11:00
Kconfig md: revise Kconfig help for MD_MULTIPATH 2009-12-14 12:51:41 +11:00
linear.c md: add MODULE_DESCRIPTION for all md related modules. 2009-12-14 12:51:41 +11:00
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: allow a resync that is waiting for other resync to complete, to be aborted. 2009-12-30 15:25:23 +11:00
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 md: add MODULE_DESCRIPTION for all md related modules. 2009-12-14 12:51:41 +11:00
multipath.h md: remove mddev_to_conf "helper" macro 2009-06-16 16:54:21 +10:00
raid0.c md: add MODULE_DESCRIPTION for all md related modules. 2009-12-14 12:51:41 +11:00
raid0.h md: remove mddev_to_conf "helper" macro 2009-06-16 16:54:21 +10:00
raid1.c md: add MODULE_DESCRIPTION for all md related modules. 2009-12-14 12:51:41 +11:00
raid1.h md/raid1: add takeover support for raid5->raid1 2009-12-14 12:51:41 +11:00
raid5.c md: fix 'degraded' calculation when starting a reshape. 2010-02-09 16:34:29 +11:00
raid5.h md: fix problems with RAID6 calculations for DDF. 2009-10-16 16:27:34 +11:00
raid6algos.c md: add MODULE_DESCRIPTION for all md related modules. 2009-12-14 12:51:41 +11:00
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: add MODULE_DESCRIPTION for all md related modules. 2009-12-14 12:51:41 +11:00
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