dm cache: resolve small nits and improve Documentation
authorMike Snitzer <snitzer@redhat.com>
Tue, 12 Nov 2013 17:17:43 +0000 (12:17 -0500)
committerMike Snitzer <snitzer@redhat.com>
Tue, 12 Nov 2013 18:11:09 +0000 (13:11 -0500)
Document passthrough mode, cache shrinking, and cache invalidation.
Also, use strcasecmp() and hlist_unhashed().

Reported-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

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