linux/drivers/md
Dan Williams c337869d95 md: do not compute parity unless it is on a failed drive
If a block is computed (rather than read) then a check/repair operation
may be lead to believe that the data on disk is correct, when infact it
isn't.  So only compute blocks for failed devices.

This issue has been around since at least 2.6.12, but has become harder to
hit in recent kernels since most reads bypass the cache.

echo repair > /sys/block/mdN/md/sync_action will set the parity blocks to the
correct state.

Cc: <stable@kernel.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-06-06 11:29:08 -07:00
..
raid6test
.gitignore
bitmap.c md: kill file_path wrapper 2008-05-24 09:56:09 -07:00
dm-bio-list.h
dm-bio-record.h
dm-crypt.c
dm-delay.c
dm-emc.c block: no need to initialize rq->cmd with blk_get_request 2008-04-29 14:48:55 +02:00
dm-exception-store.c dm: move include files 2008-04-25 13:26:55 +01:00
dm-hw-handler.c
dm-hw-handler.h
dm-io.c dm: unplug queues in threads 2008-04-25 13:26:57 +01:00
dm-ioctl.c
dm-kcopyd.c dm: unplug queues in threads 2008-04-25 13:26:57 +01:00
dm-linear.c
dm-log.c dm: move include files 2008-04-25 13:26:55 +01:00
dm-mpath-hp-sw.c block: no need to initialize rq->cmd with blk_get_request 2008-04-29 14:48:55 +02:00
dm-mpath-rdac.c block: no need to initialize rq->cmd with blk_get_request 2008-04-29 14:48:55 +02:00
dm-mpath.c
dm-mpath.h
dm-path-selector.c
dm-path-selector.h
dm-raid1.c dm: unplug queues in threads 2008-04-25 13:26:57 +01:00
dm-round-robin.c
dm-snap.c dm: move include files 2008-04-25 13:26:55 +01:00
dm-snap.h dm kcopyd: clean interface 2008-04-25 13:26:44 +01:00
dm-stripe.c
dm-table.c dm: use unlocked variants of queue flag check/set 2008-04-29 10:21:12 -07:00
dm-target.c
dm-uevent.c md: replace remaining __FUNCTION__ occurrences 2008-04-28 08:58:42 -07:00
dm-uevent.h
dm-zero.c
dm.c dm: remove md argument from specific_minor 2008-04-25 13:27:02 +01:00
dm.h dm: expose macros 2008-04-25 13:26:53 +01:00
faulty.c
Kconfig
linear.c Remove blkdev warning triggered by using md 2008-05-14 19:11:15 -07:00
Makefile dm: move include files 2008-04-25 13:26:55 +01:00
md.c md: fix uninitialized use of mddev->recovery_wait 2008-06-06 11:29:08 -07:00
mktables.c
multipath.c md: restart recovery cleanly after device failure. 2008-05-24 09:56:10 -07:00
raid0.c Remove blkdev warning triggered by using md 2008-05-14 19:11:15 -07:00
raid1.c md: restart recovery cleanly after device failure. 2008-05-24 09:56:10 -07:00
raid5.c md: do not compute parity unless it is on a failed drive 2008-06-06 11:29:08 -07:00
raid6.h
raid6algos.c drivers/md: use time_before, time_before_eq, etc 2008-04-28 08:58:42 -07:00
raid6altivec.uc
raid6int.uc
raid6mmx.c
raid6recov.c
raid6sse1.c
raid6sse2.c
raid6x86.h
raid10.c md: restart recovery cleanly after device failure. 2008-05-24 09:56:10 -07:00
unroll.pl