Re: [PATCH] vfs: add d_prune dentry operation

[Christoph Hellwig]

On Wed, Oct 05, 2011 at 09:26:10PM -0700, Sage Weil wrote:
> This adds a d_prune dentry operation that is called by the VFS prior to
> pruning (i.e. unhashing and killing) a hashed dentry from the dcache.  This
> will be used by Ceph to maintain a flag indicating whether the complete
> contents of a directory are contained in the dcache, allowing it to satisfy
> lookups and readdir without addition server communication.

What tree is the patch against?  I seems to fail to apply against Linus'
latests.  

It also seem like it basically should not be be opencoded but in a
wrapper around dentry_lru_del for all cases but the lazy removal from
LRU in case that is referenced, with some comments explaining the whole
thing.

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