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For FITRIM ioctl(2), we should not keep silence if the given range length ls less than a block size as there is no data blocks would be discareded. Hence it should return EINVAL instead. This issue can be verified via xfstests/generic/288 which is used for FITRIM argument handling tests. Signed-off-by: Jie Liu <jeff.liu@oracle.com> Cc: Mark Fasheh <mfasheh@suse.com> Cc: Joel Becker <jlbec@evilplan.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>