Description of problem:
aio_dio_bugs test from upstream autotest is failing on btrfs, while working on other filesystems


***** Start of aio_dio_bugs Autotest *****
***** Start time 18:29:26 *****
18:29:27 INFO | Writing results to /usr/local/autotest/results/default
18:29:27 INFO | Initializing the state engine
18:29:27 INFO | Symlinking init scripts
18:29:31 INFO | START	----	----	timestamp=1318631371	localtime=Oct 14 18:29:31	
18:29:31 INFO | 	START	aio_dio_bugs	aio_dio_bugs	timestamp=1318631371	localtime=Oct 14 18:29:31	
18:29:31 INFO | Dependency libaio successfuly built
18:32:54 INFO | 		ERROR	aio_dio_bugs	aio_dio_bugs	timestamp=1318631574	localtime=Oct 14 18:32:54	Command <LD_LIBRARY_PATH=/usr/local/autotest/deps/libaio/lib/ /usr/local/autotest/tests/aio_dio_bugs/src/aio-dio-extend-stat  file> failed, rc=1, Command returned non-zero exit status
  * Command: 
      LD_LIBRARY_PATH=/usr/local/autotest/deps/libaio/lib/
      /usr/local/autotest/tests/aio_dio_bugs/src/aio-dio-extend-stat  file
  Exit status: 1
  Duration: 0.35849905014
  
  stdout:
  failed to open device node: 6
18:32:54 INFO | 	END ERROR	aio_dio_bugs	aio_dio_bugs	timestamp=1318631574	localtime=Oct 14 18:32:54	
18:32:54 INFO | END GOOD	----	----	timestamp=1318631574	localtime=Oct 14 18:32:54	
***** End time 18:32:54 *****
***** End of aio_dio_bugs Autotest *****
208
aio_dio_bugs Failed: 

Version-Release number of selected component (if applicable):
RHEL 6.2 snapshot 2 (-207 kernel) and occurs in earlier releases as well (not a regression)
autotest v. 5276

How reproducible:
always

Steps to Reproduce:
1.run /kernel/misc/autotest_r5278 with /usr/local using btrfs filesystem
2.
3.
  
Actual results:


Expected results:
test passes

Additional info:

This is likely similar to the other aio btrfs issues (731946, 734339)