Re: mmap() on cdrom files fails in 2.6.9-rc2-mmX

From: Bill Davidsen (davidsen_at_tmr.com)
Date: 09/30/04

  • Next message: Alan Cox: "PATCH: (Test) it8212 driver for 2.6.9rc3" 
    To: linux-kernel@vger.kernel.org
Date:	Thu, 30 Sep 2004 14:49:32 -0400

    Jean Delvare wrote:
    > Hi all,
    >
    > (Please CC me on reply, I am not subscribed to the LKML.)
    >
    > I think I found a bug in 2.6.9-rc2-mm4. It doesn't seem to be able to
    > mmap() files located on cdroms. Same problem with -mm3 and -mm1.
    > 2.6.9-rc2 works fine. I reproduced it on two completely different
    > systems, so I guess it isn't device dependant.
    >
    > I tried to get mmap() to fail on other files with similar properties
    > (different owner, read only) but it won't. The problem seems to affect
    > only files located on cdroms.
    >
    > I also tried on a loop device-mounted cdrom image, in case the problem
    > was related to the iso9660 filesystem. The problem wouldn't show. It
    > seems to fail only on real cdroms.
    >
    > I searched the broken-out directory but wouldn't find any candidate to
    > backout.

    Is your mmap length a multiple of 2k? If not please resize and try
    again. There is some less traveled code when physical sector size is not
    512 bytes.

    Yes, this is a wild guess, but it's easy to test if you have the kernel
    built. 

    -- 
    -bill davidsen (davidsen@tmr.com)
"The secret to procrastination is to put things off until the
  last possible moment - but no longer"  -me
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