vfs: push dentry_unhash on rename_dir into file systems
Only a few file systems need this. Start by pushing it down into each rename method (except gfs2 and xfs) so that it can be dealt with on a per-fs basis. Acked-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NSage Weil <sage@newdream.net> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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