ext4: stop issuing discards if not supported by device
Turn off issuance of discard requests if the device does not support it - similar to the action we take for barriers. This will save a little computation time if a non-discardable device is mounted with -o discard, and also makes it obvious that it's not doing what was asked at mount time ... Signed-off-by: NEric Sandeen <sandeen@redhat.com> Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
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