Re: [PATCH] Fix shrink_dcache_parent() against shrink_dcache_memory() race (3rd updated patch)]

[Jan Blunck <jblunck@suse.de>]

On Fri, Mar 10, Kirill Korotaev wrote:

> >I really think that we need to stop prune_one_dentry from being called
> >on dentries for a filesystem that is being unmounted.  With that code
> >currently in -git, that means passing a 'struct super_block *' into
> >prune_dcache so that it ignores any filesystem with ->s_root==NULL
> >unless that filesystem is the filesystem that was passed.
> Can try...
> 

Can not ... because of down_read(s_umount) before checking s_root :(

So what do we do now?

 1. always get the reference counting right outside of dcache_lock

 2. hack around with different paths for prune_dcache() when called from
    shrink_dcache_memory() and shrink_dcache_parent()

I think that we should go for the first.

Regards,
	Jan

-- 
Jan Blunck                                               jblunck@suse.de
SuSE LINUX AG - A Novell company
Maxfeldstr. 5                                          +49-911-74053-608
D-90409 Nürnberg                                      http://www.suse.de
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