8d03b99b9d
The new structure is copy-on-write. With the assumption that path lookups are significantly more frequent than chdirs and chrooting this is a win. This provides stable root and jail root vnodes without the need to reference them on lookup, which in turn means less work on globally shared structures. Note this also happens to fix a bug where jail vnode was never referenced, meaning subsequent access on lookup could run into use-after-free. Reviewed by: kib Differential Revision: https://reviews.freebsd.org/D23884 |
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