From: Joe Thornber <ejt@redhat.com>
Date: Mon, 24 Nov 2014 14:05:16 +0000 (+0000)
Subject: dm cache: fix some issues with the new discard range support
X-Git-Tag: omap-for-v3.19/fixes-for-merge-window~22^2~10
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2572629a1318eb9e13e70fa59756d7bcfb80319e;p=pandora-kernel.git

dm cache: fix some issues with the new discard range support

Commit 7ae34e777 ("dm cache: improve discard support") needed to also:
- discontinue having DM core split the discard bios on cache block
  boundaries
- calculate the cache's discard_nr_blocks relative to the determined
  discard_block_size rather than using oblock_to_dblock()

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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