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All places where we call set_mnt_shared() are guaranteed to have non-zero ->mnt_group_id - either by explicit test, or by having done successful invent_group_ids() covering the same mount since we'd grabbed namespace_sem. The opposite combination (non-zero ->mnt_group_id and !IS_MNT_SHARED()) *is* possible - it means that we have allocated group id, but didn't get around to set_mnt_shared() yet; such state is transient - by the time we do namespace_unlock(), we must either do set_mnt_shared() or unroll the group id allocations by cleanup_group_ids(). 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.