[TRUSTY SRU][PATCH] xfs: xfs_dir2_block_to_sf temp buffer allocation fails

[Rafael David Tinoco]

 Buglink: https://bugs.launchpad.net/bugs/1382333
 
 Impact: 
 - xfs can hang on lack of contiguous memory page to be allocated.
 
 Fix: 
 - upstream patch (b3f03bac8132207a20286d5602eda64500c19724).
 
 Testcase:
 - buddyinfo showing lack of contiguous blocks to be allocated (fragmented memory)
 - to create 1 million files in 1 directory (attached script as an example)
 - to observe message: XFS: possible memory allocation deadlock in kmem_alloc (mode:0x250)
 
 Observations:
 
 This patch removes the need for a directory sized allocation from 
 xfs funcion responsible to convert directory structure to shorter
 form. This reduces dramatically the probability of getting kernel
 memory allocations failure when memory is fragmented.

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2.1.1