This introduces RECURSE_DIR_UNLINK + RECURSE_DIR_UNLINK_GRACEFUL as new return values for recurse_dir() callbacks. If either is returned the inode currently processed will be removed and iteration continues with the next item. This is useful to have in the recurse_dir() mechanism itself (rather than implement in the callback itself), due to ordering: we want to pin the inodes via an fd while calling the callbacks, but we have to close it before removal of the inodes. By moving this into the recurse_dir() infra, we can implement this easily.
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