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Commit de7180ff authored by Mike Snitzer's avatar Mike Snitzer
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dm cache: add support for discard passdown to the origin device


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: default avatarMike Snitzer <snitzer@redhat.com>
parent f87e033b
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