The only usage of it that I can find is in fs/iobuf.c:end_kio_request().
I can't find code in the kernel that sets the end_io field. The kiobuf
structure should be hidden from drivers, so a driver shouldn't be
setting it. The callback routines for the IO are set in the individual
buffer headers. So far it looks like this check in end_kio_request()
always does nothing because the end_io field is initialized as 0.
Am I missing something?
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