[Bug 13602] some HFS CD-ROM's can't be read

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https://bugzilla.kernel.org/show_bug.cgi?id=13602





--- Comment #4 from Anonymous Emailer <anonymous@xxxxxxxxxxxxxxxxxxxx>  2010-10-28 16:06:44 ---
Reply-To: James.Bottomley@xxxxxxx

On Thu, 2010-10-28 at 12:53 +0000, bugzilla-daemon@xxxxxxxxxxxxxxxxxxx
wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=13602
> 
> 
> Christoph Hellwig <hch@xxxxxx> changed:
> 
>            What    |Removed                     |Added
> ----------------------------------------------------------------------------
>           Component|HFS/HFSPLUS                 |SCSI
>          AssignedTo|hch@xxxxxx                  |linux-scsi@xxxxxxxxxxxxxxx
>             Product|File System                 |IO/Storage

Why is this actually a bug?  Linux has never supported filesystem block
sizes smaller than device ones ... we don't have the necessary RMW code
for it.  The sr driver supports 512 byte sectors but *only* if the CD
was burned with them (which isn't always possible depending on CD
burner) and the reader supports them.  I'd need the dmesgs to be sure
but i'd guess READ_CAPACITY on this cd returns 2048 as the block size.

James

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