Re: BKL removal

[Matthew Wilcox]

On Wed, Jul 10, 2002 at 12:03:08PM +0200, Marco Colombo wrote:
> Larry, there's something I've always wanted to ask you about your
> idea of the "locking cliff": when you're counting the number of locks,
> are you looking at the running image of an OS or at the source? 

Larry normally talks about the number of conceptual locks.  So in order
to manipulate a `struct file', it really doesn't matter whether you have
to grab the BKL, the files_struct lock or the filp->lock.  There's a big
difference if you have to grab the filp->pos_lock, the filp->ra_lock and
the filp->iobuf_lock.  You'd have to know what order to grab them in,
for a start.

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