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os/bluestore: cache: define 'empty' buffer
authorSage Weil <sage@redhat.com>
Fri, 10 Jun 2016 13:24:10 +0000 (09:24 -0400)
committerSage Weil <sage@redhat.com>
Wed, 22 Jun 2016 15:28:40 +0000 (11:28 -0400)
commitba0a7c4027d6c9a4e4b66aeef8e18813bc21111a
tree24a8eecab69d79a606006008a87c0ad511566184
parent7d9629c07e5c7f07ae78072d17608c62979f5f67
os/bluestore: cache: define 'empty' buffer

This is a buffer with no data.  It's a placeholder that is there to be used
by cache replacement algorithms like 2Q and MQ that needs history for
trimmed buffers.

Signed-off-by: Sage Weil <sage@redhat.com>
src/os/bluestore/BlueStore.h