Re: Block layer question - indicating EOF on block devices

[Alan Cox]

On Iau, 2004-12-02 at 08:18, Jens Axboe wrote:
> The upper buffer layer could do something intelligent if EOF is set on
> the bio, it really should. The problem is that there's no -EXXX to flag
> EOF from the driver, it would be nicest if one could just do:
> 
> 	end_that_request_chunk(req, 1, good_bytes);
> 	end_that_request_chunk(req, -EOF, residual);
> 

We have a set of internal error codes around -512 for things like
"please use
the default ioctl behaviour". The error codes don't seem to get
propogated up through the page cache however when I tried using this (I
just "borrowed"
-ENOMEDIUM for testing) with the idea of catching it at the top.


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