[PATCH] Add ENOSYS into sys_io_cancel

[Shiow-wen Cheng <cheng_27513@yahoo.com>]

Other than few exceptions (e.g. usb/gadget), none of
the current filesystems and/or drivers that has
io_cancel implemented (kiocb->ki_cancel left with
NULL). However, the io_cancel() system call
(sys_io_cancel) somehow universally sets return code
to -EAGAIN. This gives us a false impression that
io_cancel() is supported (implemented) but just never
works - would appreciate if this patch is taken.

-- s.w.

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Attachment: cancel.patch
Description: 3748003194-cancel.patch