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Once attach_recursive_mnt() has created all copies of original subtree, it needs to put them in place(s). Steps needed for those are slightly different: 1) in 'move' case, original copy doesn't need any rbtree manipulations (everything's already in the same namespace where it will be), but it needs to be detached from the current location 2) in 'attach' case, original may be in anon namespace; if it is, all those mounts need to removed from their current namespace before insertion into the target one 3) additional copies have a couple of extra twists - in case of cross-userns propagation we need to lock everything other the root of subtree and in case when we end up inserting under an existing mount, that mount needs to be found (for original copy we have it explicitly passed by the caller). Quite a bit of that can be unified; as the first step, make commit_tree() helper (inserting mounts into namespace, hashing the root of subtree and marking the namespace as updated) usable in all cases; (2) and (3) are already using it and for (1) we only need to make the insertion of mounts into namespace conditional. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.