From: Lukas Czerner Date: Wed, 11 Jun 2014 16:28:43 +0000 (-0400) Subject: dm thin: update discard_granularity to reflect the thin-pool blocksize X-Git-Tag: omap-for-v3.16/fixes-against-rc1~37^2 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=09869de57ed2728ae3c619803932a86cb0e2c4f8;p=pandora-kernel.git dm thin: update discard_granularity to reflect the thin-pool blocksize DM thinp already checks whether the discard_granularity of the data device is a factor of the thin-pool block size. But when using the dm-thin-pool's discard passdown support, DM thinp was not selecting the max of the underlying data device's discard_granularity and the thin-pool's block size. Update set_discard_limits() to set discard_granularity to the max of these values. This enables blkdev_issue_discard() to properly align the discards that are sent to the DM thin device on a full block boundary. As such each discard will now cover an entire DM thin-pool block and the block will be reclaimed. Reported-by: Zdenek Kabelac Signed-off-by: Lukas Czerner Signed-off-by: Mike Snitzer Cc: stable@vger.kernel.org --- Reading git-diff-tree failed