[stable] splice: sendfile() at once fails for big files

[Ben Hutchings <ben@xxxxxxxxxxxxxxx>]

This fix went into 4.1, but is needed in all earlier branches except
for 2.6.32:

commit 0ff28d9f4674d781e492bcff6f32f0fe48cf0fed
Author: Christophe Leroy <christophe.leroy@xxxxxx>
Date:   Wed May 6 17:26:47 2015 +0200

    splice: sendfile() at once fails for big files

So far as I know, only AF_ALG sockets are affected.

Ben.

-- 
Ben Hutchings
If more than one person is responsible for a bug, no one is at fault.

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