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dm cache metadata: add "metadata2" feature

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If "metadata2" is provided as a table argument when creating/loading a
cache target a more compact metadata format, with separate dirty bits,
is used.  "metadata2" improves speed of shutting down a cache target.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Joe Thornber
2016-09-22 06:15:21 -04:00
committed by Mike Snitzer
parent ae4a46a1f6
commit 629d0a8a1a
4 changed files with 278 additions and 53 deletions
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4
Documentation/device-mapper/cache.txt
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@@ -207,6 +207,10 @@ Optional feature arguments are:
block, then the cache block is invalidated.
To enable passthrough mode the cache must be clean.
metadata2 : use version 2 of the metadata. This stores the dirty bits
in a separate btree, which improves speed of shutting
down the cache.
A policy called 'default' is always registered. This is an alias for
the policy we currently think is giving best all round performance.