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Currently we are taking mount_writer; what that function needs is either mount_locked_reader (we are not changing anything, we just want to iterate through the subtree) or namespace_shared and a reference held by caller on the root of subtree - that's also enough to stabilize the topology. The thing is, all callers are already holding at least namespace_shared as well as a reference to the root of subtree. Let's make the callers provide locking warranties - don't mess with mount_lock in check_for_nsfs_mounts() itself and document the locking requirements. Reviewed-by: Christian Brauner <brauner@kernel.org> 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.