vfs: reject rename into descendant directory#64285
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MemoryProvider allowed renaming a directory into its own descendant, which detached the subtree from the root. Reject this case with EINVAL before mutating the tree. Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com> Assisted-by: openai:gpt-5.5
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Fixes: #64284
Fixes
MemoryProvider.renameSync()so renaming a directory into its owndescendant throws
EINVALinstead of detaching the subtree.Assisted-by: openai:gpt-5.5