This commit in 3.19: commit 7985090aa0201fa7760583f9f8e6ba41a8d4c392 Author: Martin K. Petersen <martin.petersen@xxxxxxxxxx> Date: Fri Nov 7 00:08:13 2014 -0500 sd: disable discard_zeroes_data for UNMAP appears to fix a data corruption bug. Should it be backported to older stable branches? Similarly for this one in 4.4: commit 397737223c59e89dca7305feb6528caef8fbef84 Author: Martin K. Petersen <martin.petersen@xxxxxxxxxx> Date: Fri Nov 13 16:46:47 2015 -0500 sd: Make discard granularity match logical block size when LBPRZ=1 (along with: commit f4327a95dd080ed6aecb185478a88ce1ee4fa3c4 Author: Martin K. Petersen <martin.petersen@xxxxxxxxxx> Date: Sat Mar 5 17:52:02 2016 -0500 sd: Fix discard granularity when LBPRZ=1 ) Ben. -- Ben Hutchings When in doubt, use brute force. - Ken Thompson
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