Re: BUG in the block layer (partial reads not reported)

[Helge Hafting]

On Fri, Oct 21, 2005 at 06:31:57PM +0100, Alan Cox wrote:
> 
> The essential problem however is that if you say a disc is a given size
> and it turns out not to be (as happens with CD-R especially or with
> buggy readers) then Linux block layer can't cope. Its well known and
> causes endless problems for CD-R users with some IDE drives on Linux.
> Its a big generator of 2.6 vendor bug reports.
> 
Seems to me that the best fix for devices that may reïport the wrong size
is to always use a foolproof way of determining the size.  I.e. when
a CD-R cannot be trusted, determine the size by trying to read the
last sectors instead of using the reported number.  

Helge Hafting
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