bcache: Make sure blocksize isn't smaller than device blocksize
authorKent Overstreet <koverstreet@google.com>
Wed, 24 Apr 2013 04:51:48 +0000 (21:51 -0700)
committerKent Overstreet <koverstreet@google.com>
Wed, 24 Apr 2013 20:07:39 +0000 (13:07 -0700)
Sanity check to make sure we don't end up doing IO the device doesn't
support.

Signed-off-by: Kent Overstreet <koverstreet@google.com>

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