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    SubjectRe: bd_mount_mutex -> bd_mount_sem (was Re: xfs_file_ioctl / xfs_freeze: BUG: warning at kernel/mutex-debug.c:80/debug_mutex_unlock())
    Andrew Morton wrote:
    > On Mon, 08 Jan 2007 21:12:40 -0600
    > Eric Sandeen <sandeen@sandeen.net> wrote:
    >
    >> Andrew Morton wrote:
    >>> On Tue, 9 Jan 2007 10:47:28 +1100
    >>> David Chinner <dgc@sgi.com> wrote:
    >>>
    >>>> On Mon, Jan 08, 2007 at 10:40:54AM -0600, Eric Sandeen wrote:
    >>>>> Sami Farin wrote:
    >>>>>> On Mon, Jan 08, 2007 at 08:37:34 +1100, David Chinner wrote:
    >>>>>> ...
    >>>>>>>> fstab was there just fine after -u.
    >>>>>>> Oh, that still hasn't been fixed?
    >>>>>> Looked like it =)
    >>>>> Hm, it was proposed upstream a while ago:
    >>>>>
    >>>>> http://lkml.org/lkml/2006/9/27/137
    >>>>>
    >>>>> I guess it got lost?
    >>>> Seems like it. Andrew, did this ever get queued for merge?
    >>> Seems not. I think people were hoping that various nasties in there
    >>> would go away. We return to userspace with a kernel lock held??
    >> Is a semaphore any worse than the current mutex in this respect? At
    >> least unlocking from another thread doesn't violate semaphore rules. :)
    >
    > I assume that if we weren't returning to userspace with a lock held, this
    > mutex problem would simply go away.
    >

    Well nobody's asserting that the filesystem must always be locked &
    unlocked by the same thread, are they? That'd be a strange rule to
    enforce upon the userspace doing the filesystem management wouldn't it?
    Or am I thinking about this wrong...

    -Eric
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