dm cache: set/clear the cache core's dirty_bitset when loading mappings

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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>

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Joe Thornber 2017-03-31 10:09:45 -04:00 • committed by Mike Snitzer

parent 7b81ef8b14

commit 449b668ce0

1 changed files with 6 additions and 0 deletions

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drivers/md/dm-cache-target.c

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