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author | Joe Thornber <ejt@redhat.com> | 2017-03-31 10:09:45 -0400 |
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committer | Mike Snitzer <snitzer@redhat.com> | 2017-03-31 11:33:44 -0400 |
commit | 449b668ce0b9069fcaafa6344c7f10fa2ba9632e (patch) | |
tree | 6efb710aa1954bcb360f7562ea895b53ad5abf60 /drivers/md/dm-cache-policy-smq.c | |
parent | 7b81ef8b14f80033e4a4168d199a0f5fd79b9426 (diff) | |
download | linux-stable-449b668ce0b9069fcaafa6344c7f10fa2ba9632e.tar.gz linux-stable-449b668ce0b9069fcaafa6344c7f10fa2ba9632e.tar.bz2 linux-stable-449b668ce0b9069fcaafa6344c7f10fa2ba9632e.zip |
dm cache: set/clear the cache core's dirty_bitset when loading mappings
When loading metadata make sure to set/clear the dirty bits in the cache
core's dirty_bitset as well as the policy.
Otherwise the cache core is unaware that any blocks were dirty when the
cache was last shutdown. A very serious side-effect being that the
cleaner policy would therefore never be tasked with writing back dirty
data from a cache that was in writeback mode (e.g. when switching from
smq policy to cleaner policy when decommissioning a writeback cache).
This fixes a serious data corruption bug associated with writeback mode.
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/dm-cache-policy-smq.c')
0 files changed, 0 insertions, 0 deletions