[PATCH 3/4] ima: use existing read file operation method to calculate file hash

[Christoph Hellwig]

A strong and a weak NAK on this.  For one thing you should not
call ->read for fs code at all - use read_iter where it fits
(it does here) or the kernel_read() helper otherwise.

But once again I don't think this is correct - it's a potentially
unsafe default, so please wire up the file systems actually tested
and known to work manually.

E.g. this does the wrong thing for at least NFS and OCFS2.
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