Eric W. Biederman wrote:
> This modifies sysfs_drop_dentry so it no longers needs the
> sysfs_assoc_lock and it's assorted challenges. 
> 
> The principal idea is that __sysfs_get_dentry when not creating dentry
> will return a dentry for the sysfs_dirent if there is one in the
> dcache.   If we do get a dentry we can drop it and force it out
> of the cache.
> 
> For good measure I am also calling shrink_dcache_parent which will
> force all of the child dentries out of the dcache as well if it
> is a directory.

I don't think we need this as we drop all sd's recursively anyway.  Can
we drop it?

Other than that, looks good.

-- 
tejun
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