eCryptfs: set inode key only once per crypto operation
There is no need to keep re-setting the same key for any given eCryptfs inode. This patch optimizes the use of the crypto API and helps performance a bit. Signed-off-by: NTrevor Highland <trevor.highland@gmail.com> Signed-off-by: NMichael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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