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[ Upstream commit681370f4b0] We don't drop the reference on the nfsdfs filesystem with mntput(nn->nfsd_mnt) until nfsd_exit_net(), but that won't be called until the nfsd module's unloaded, and we can't unload the module as long as there's a reference on nfsdfs. So this prevents module unloading. Fixes:2c830dd720("nfsd: persist nfsd filesystem across mounts") Reported-and-Tested-by: Luo Xiaogang <lxgrxd@163.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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 Restructured Text 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.