Re: [PATCH 14/19] ext3: remove unnecessary dentry_unhash on rmdir/rename_dir

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On Tue, 24 May 2011, Jan Kara wrote:
> On Tue 24-05-11 13:06:17, Sage Weil wrote:
> > ext3 has no problems with lingering references to unlinked directory
> > inodes.
>   OK, so if I understand right, dentry_unhash() has been there only so that
> filesystem can detect whether (something under) removed directory is in
> use? So filesystems which can happily handle unlinked but open directories
> don't need it, right? If that's the case, you can add:
>   Acked-by: Jan Kara <jack@xxxxxxx>
> to this patch and also the ext2 version.

Right.  Basically, a simple fs can return EBUSY if the dentry is hashed 
(implying there are still references) and not worry about a racing process 
traversing into the directory while rmdir is running.  A sane fs can 
handle references and doesn't care if a racing process traverses into the 
dir before the ->rmdir method completes.

Thanks!
sage
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