NeilBrown 527d01946f md: flush writes before starting a recovery. ... commit 133d4527ea upstream. When we write to a degraded array which has a bitmap, we make sure the relevant bit in the bitmap remains set when the write completes (so a 're-add' can quickly rebuilt a temporarily-missing device). If, immediately after such a write starts, we incorporate a spare, commence recovery, and skip over the region where the write is happening (because the 'needs recovery' flag isn't set yet), then that write will not get to the new device. Once the recovery finishes the new device will be trusted, but will have incorrect data, leading to possible corruption. We cannot set the 'needs recovery' flag when we start the write as we do not know easily if the write will be "degraded" or not. That depends on details of the particular raid level and particular write request. This patch fixes a corruption issue of long standing and so it suitable for any -stable kernel. It applied correctly to 3.0 at least and will minor editing to earlier kernels. Reported-by: Bill <billstuff2001@sbcglobal.net> Tested-by: Bill <billstuff2001@sbcglobal.net> Link: http://lkml.kernel.org/r/53A518BB.60709@sbcglobal.net Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2014-07-09 11:14:02 -07:00
..
bcache	bcache: Data corruption fix	2014-02-06 11:08:16 -08:00
persistent-data	dm transaction manager: fix corruption due to non-atomic transaction commit	2014-05-13 13:59:45 +02:00
bitmap.c	md: use set_bit_le and clear_bit_le	2013-04-24 11:42:41 +10:00
bitmap.h	md/bitmap: record the space available for the bitmap in the superblock.	2012-05-22 13:55:34 +10:00
dm-bio-prison.c	dm: add cache target	2013-03-01 22:45:51 +00:00
dm-bio-prison.h	dm: add cache target	2013-03-01 22:45:51 +00:00
dm-bio-record.h
dm-bufio.c	dm bufio: initialize read-only module parameters	2013-12-20 07:45:10 -08:00
dm-bufio.h	dm bufio: prefetch	2012-03-28 18:41:29 +01:00
dm-builtin.c	dm sysfs: fix a module unload race	2014-02-13 13:48:02 -08:00
dm-cache-block-types.h	dm: add cache target	2013-03-01 22:45:51 +00:00
dm-cache-metadata.c	dm transaction manager: fix corruption due to non-atomic transaction commit	2014-05-13 13:59:45 +02:00
dm-cache-metadata.h	dm cache: policy ignore hints if generated by different version	2013-03-20 17:21:28 +00:00
dm-cache-policy-cleaner.c	dm cache: policy change version from string to integer set	2013-03-20 17:21:27 +00:00
dm-cache-policy-internal.h	dm cache: policy change version from string to integer set	2013-03-20 17:21:27 +00:00
dm-cache-policy-mq.c	dm cache: policy change version from string to integer set	2013-03-20 17:21:27 +00:00
dm-cache-policy.c	dm cache: policy change version from string to integer set	2013-03-20 17:21:27 +00:00
dm-cache-policy.h	dm cache policy: fix description of lookup fn	2013-05-10 14:37:17 +01:00
dm-cache-target.c	dm cache: always split discards on cache block boundaries	2014-06-11 12:03:23 -07:00
dm-crypt.c	dm crypt: fix cpu hotplug crash by removing per-cpu structure	2014-06-07 13:25:39 -07:00
dm-delay.c	dm delay: fix a possible deadlock due to shared workqueue	2013-12-20 07:45:11 -08:00
dm-exception-store.c	dm: replace simple_strtoul	2012-07-27 15:07:59 +01:00
dm-exception-store.h
dm-flakey.c	dm: rename request variables to bios	2013-03-01 22:45:47 +00:00
dm-io.c	dm kcopyd: add WRITE SAME support to dm_kcopyd_zero	2012-12-21 20:23:37 +00:00
dm-ioctl.c	dm ioctl: set noio flag to avoid __vmalloc deadlock	2013-08-04 16:51:02 +08:00
dm-kcopyd.c	dm kcopyd: introduce configurable throttling	2013-03-01 22:45:49 +00:00
dm-linear.c	dm: rename request variables to bios	2013-03-01 22:45:47 +00:00
dm-log-userspace-base.c	Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux	2011-11-06 19:44:47 -08:00
dm-log-userspace-transfer.c	connector/userns: replace netlink uses of cap_raised() with capable()	2012-05-10 23:21:39 -04:00
dm-log-userspace-transfer.h
dm-log.c	dm: use memweight()	2012-07-30 17:25:16 -07:00
dm-mpath.c	dm mpath: fix stalls when handling invalid ioctls	2014-03-06 21:30:13 -08:00
dm-mpath.h
dm-path-selector.c	md: Add module.h to all files using it implicitly	2011-10-31 19:31:18 -04:00
dm-path-selector.h
dm-queue-length.c	dm: reject trailing characters in sccanf input	2012-03-28 18:41:26 +01:00
dm-raid.c	dm-raid: silence compiler warning on rebuilds_per_group.	2013-10-05 07:13:11 -07:00
dm-raid1.c	block: Use bio_sectors() more consistently	2013-03-23 14:15:30 -07:00
dm-region-hash.c	dm raid1: fix crash with mirror recovery and discard	2012-07-20 14:25:03 +01:00
dm-round-robin.c	dm: reject trailing characters in sccanf input	2012-03-28 18:41:26 +01:00
dm-service-time.c	dm: reject trailing characters in sccanf input	2012-03-28 18:41:26 +01:00
dm-snap-persistent.c	dm snapshot: fix data corruption	2013-11-04 04:31:06 -08:00
dm-snap-transient.c	md: Add in export.h for files using EXPORT_SYMBOL	2011-10-31 19:31:19 -04:00
dm-snap.c	dm snapshot: avoid snapshot space leak on crash	2013-12-20 07:45:10 -08:00
dm-stripe.c	dm stripe: fix regression in stripe_width calculation	2013-05-10 14:37:14 +01:00
dm-sysfs.c	dm sysfs: fix a module unload race	2014-02-13 13:48:02 -08:00
dm-table.c	dm table: fail dm_table_create on dm_round_up overflow	2013-12-20 07:45:11 -08:00
dm-target.c	dm: rename request variables to bios	2013-03-01 22:45:47 +00:00
dm-thin-metadata.c	dm thin: avoid metadata commit if a pool's thin devices haven't changed	2014-03-06 21:30:13 -08:00
dm-thin-metadata.h	dm thin: avoid metadata commit if a pool's thin devices haven't changed	2014-03-06 21:30:13 -08:00
dm-thin.c	dm thin: update discard_granularity to reflect the thin-pool blocksize	2014-07-09 11:14:01 -07:00
dm-uevent.c	md: Add in export.h for files using EXPORT_SYMBOL	2011-10-31 19:31:19 -04:00
dm-uevent.h
dm-verity.c	dm verity: fix inability to use a few specific devices sizes	2013-08-04 16:51:02 +08:00
dm-zero.c	dm: rename request variables to bios	2013-03-01 22:45:47 +00:00
dm.c	dm sysfs: fix a module unload race	2014-02-13 13:48:02 -08:00
dm.h	dm sysfs: fix a module unload race	2014-02-13 13:48:02 -08:00
faulty.c	block: Add bio_end_sector()	2013-03-23 14:15:29 -07:00
Kconfig	dm sysfs: fix a module unload race	2014-02-13 13:48:02 -08:00
linear.c	block: Add bio_end_sector()	2013-03-23 14:15:29 -07:00
linear.h
Makefile	dm sysfs: fix a module unload race	2014-02-13 13:48:02 -08:00
md.c	md: flush writes before starting a recovery.	2014-07-09 11:14:02 -07:00
md.h	md: fix problem when adding device to read-only array with bitmap.	2014-01-25 08:27:12 -08:00
multipath.c	MD: change the parameter of md thread	2012-10-11 13:34:00 +11:00
multipath.h
raid1.c	md/raid1: r1buf_pool_alloc: free allocate pages when subsequent allocation fails.	2014-05-30 21:52:12 -07:00
raid1.h	md/raid1: prevent merging too large request	2012-07-31 10:03:53 +10:00
raid5.c	md/raid5: Fix CPU hotplug callback registration	2014-02-22 12:41:29 -08:00
raid5.h	md/raid5: fix interaction of 'replace' and 'recovery'.	2013-08-04 16:50:54 +08:00
raid10.c	md/raid10: fix two bugs in handling of known-bad-blocks.	2014-01-25 08:27:12 -08:00
raid10.h	MD RAID10: Improve redundancy for 'far' and 'offset' algorithms (part 1)	2013-02-26 11:55:30 +11:00
raid0.c	block: Change bio_split() to respect the current value of bi_idx	2013-03-23 14:15:30 -07:00
raid0.h	md: add proper merge_bvec handling to RAID0 and Linear.	2012-03-19 12:46:39 +11:00