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dm cache: add support for discard passdown to the origin device

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DM cache now defaults to passing discards down to the origin device.
User may disable this using the "no_discard_passdown" feature when
creating the cache device.

If the cache's underlying origin device doesn't support discards then
passdown is disabled (with warning).  Similarly, if the underlying
origin device's max_discard_sectors is less than a cache block discard
passdown will be disabled (this is required because sizing of the cache
internal discard bitset depends on it).

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2019-02-25 11:07:10 -05:00
commit de7180ff90
2 changed files with 103 additions and 26 deletions
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3
Documentation/device-mapper/cache.txt
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@ -206,6 +206,9 @@ Optional feature arguments are:
in a separate btree, which improves speed of shutting
down the cache.
no_discard_passdown : disable passing down discards from the cache
to the origin's data device.
A policy called 'default' is always registered. This is an alias for
the policy we currently think is giving best all round performance.