why not
if (branch(old_dentry) != left_most)
copyup();
vfs_rename(old_dentry, new_dentry);
create_whiteout(old_dentry);
would seemingly simplify it a lot, negative is that a rename() would
create a copy even if source is on a rw branch.
The question is rename() more similar to a "file modification" or a file
creation/unlink. if it's the former, the current hoops make some sense,
if it's the latter, the simplified version would seemingly make more sense.
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