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SubjectRe: [PATCH 1/3][BUGFIX] configfs: Introduce configfs_dirent_lock
On Fri, Jun 13, 2008 at 02:09:23PM +0200, Louis Rilling wrote:
> Oh, should probably provide some d_revalidate() also, which would return
> -ENOENT for a dentry under a directory flagged with USET_DROPPING. But I'm
> realizing that such "inconsistencies" (some default groups being valid in the
> d_cache and some other ones not) already happen between the time detach_prep()
> has flagged a default group with USET_DROPPING and the default
> group is actually detached. Am I wrong?

We don't need d_revalidate(). As I stated at the end of my last
email, USET_DROPPING does not mean 'It already went away'. It just
means we're safe to do so, because we prevent new children. We actually
make it go away underneath i_mutex.
The VFS handles inconsistencies between lookup and action. It's
part of normal operation. Otherwise, they'd have to hold all the
i_mutexes around lookup and action.

Joel

--

"When choosing between two evils, I always like to try the one
I've never tried before."
- Mae West

Joel Becker
Principal Software Developer
Oracle
E-mail: joel.becker@oracle.com
Phone: (650) 506-8127


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