dm raid: add discard support for RAID levels 1 and 10
Discard support is not enabled for RAID levels 4, 5, and 6 at this time due to concerns about unreliable discard_zeroes_data support on some hardware. Otherwise, discards could cause stripe data corruption (classic example of bad apples spoiling the bunch). Signed-off-by: NHeinz Mauelshagen <heinzm@redhat.com> Signed-off-by: NMike Snitzer <snitzer@redhat.com>
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