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authorMike Snitzer <snitzer@redhat.com>2019-02-25 11:07:10 -0500
committerMike Snitzer <snitzer@redhat.com>2019-03-05 14:53:52 -0500
commitde7180ff908b2bc0342e832dbdaa9a5f1ecaa33a (patch)
treedb7c3b6e894a7d5f96ab155500ff5a8275cfad66 /arch/nios2/kernel
parentdm writecache: fix typo in name for writeback_wq (diff)
downloadlinux-dev-de7180ff908b2bc0342e832dbdaa9a5f1ecaa33a.tar.xz
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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: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'arch/nios2/kernel')
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