eCryptfs: Truncate path improvements

[Tyler Hicks]

As Linus pointed out[1], eCryptfs needs more checks around its truncate path.
The first patch in this series makes it possible for an eCryptfs truncate
operation to be gracefully interrupted by a fatal signal. The second adds
checks for eCryptfs inode changes in setattr. The third is simply removal of
an old, unused function.

Tyler

[1] https://lkml.org/lkml/2012/1/18/356


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