splice blocks indefinitely when len > 64k?

[Daniel Drake <ddrake@brontes3d.com>]

Hi,

I'm experimenting with splice and have run into some unusual behaviour.

I am using the utilities in git://brick.kernel.dk/data/git/splice.git

In splice.h, when changing SPLICE_SIZE from:

#define SPLICE_SIZE (64*1024)

to

#define SPLICE_SIZE ((64*1024)+1)

splice-cp hangs indefinitely when copying files sized 65537 bytes or
more. It hangs on the first splice() call.

Is this a bug? I'd like to be able to copy much more than 64kb on a
single splice call.

Thanks!
Daniel


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