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@ -428,7 +428,7 @@ $ unshare --fork --mount-proc --pid
\section{mount namespaces}
\label{sec:voiding-mount}
One of the defining philosophies of Unix is everything's a file. This perhaps explains why mount namespaces, the namespaces which control the single file hierarchy, would be the most complex. This section presents a case study of the implementation of voiding the most difficult namespace and an analysis of why things were so much more difficult to implement than with others. We first look at the inheritance behaviour, and the link maintained between a freshly created namespace and its parent (§\label{sec:voiding-mount-inherited}). Secondly, I present shared subtrees and the reasoning behind them (§\ref{sec:voiding-mount-shared-subtrees}), before finishing with a discussion of lazy unmounting in Linux and the weakness of the userspace utilities (§\ref{sec:voiding-mount-lazy-unmount}). This culminates in a namespace that is successfully voided, but presents a huge burden to userspace programmers attempting to work with these namespaces in their own projects.
One of the defining philosophies of Unix is everything's a file. This perhaps explains why mount namespaces, the namespaces which control the single file hierarchy, would be the most complex. This section presents a case study of the implementation of voiding the most difficult namespace and an analysis of why things were so much more difficult to implement than with others. We first look at the inheritance behaviour, and the link maintained between a freshly created namespace and its parent (§\ref{sec:voiding-mount-inherited}). Secondly, I present shared subtrees and the reasoning behind them (§\ref{sec:voiding-mount-shared-subtrees}), before finishing with a discussion of lazy unmounting in Linux and the weakness of the userspace utilities (§\ref{sec:voiding-mount-lazy-unmount}). This culminates in a namespace that is successfully voided, but presents a huge burden to userspace programmers attempting to work with these namespaces in their own projects.
\subsection{Filesystem inheritance}
\label{sec:voiding-mount-inherited}