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Description of problem:
At the moment dd is not supporting the count_bytes iflag.

Version-Release number of selected component (if applicable):
coreutils-8.4-31.el6_5.1

How reproducible:
100%

Steps to Reproduce:
$ truncate -s 5120 test-in
$ dd if=test-in of=test-out bs=1024 count=5119 iflag=count_bytes
dd: invalid input flag: `count_bytes'

Actual results:
dd: invalid input flag: `count_bytes'

Expected results:
4+1 records in
4+1 records out
5119 bytes (5.1 kB) copied, 0.000199956 s, 25.6 MB/s


Additional info:
The count_bytes iflag is very useful for copying virtual disks images.

If we were to backport this the changes would be:
  http://git.sv.gnu.org/gitweb/?p=coreutils.git;a=commitdiff_plain;h=140eca15
  http://git.sv.gnu.org/gitweb/?p=coreutils.git;a=commitdiff_plain;h=4bb5dbcf

Note the same functionality can be simulated quite efficiently
using multiple dd runs with decreasing block size as demonstrated here:
  https://github.com/openstack/nova/commit/9d2ea970

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2014-1457.html