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Before this patch, gfs2 saved the pointers to the two daemon threads (logd and quotad) in the superblock, but they were never cleared, even if the threads were stopped (e.g. on remount -o ro). That meant that certain error conditions (like a withdrawn file system) could race. For example, xfstests generic/361 caused an IO error during remount -o ro, which caused the kthreads to be stopped, then the error flagged. Later, when the test unmounted the file system, it would try to stop the threads a second time with kthread_stop. This patch does two things: First, every time it stops the threads it zeroes out the thread pointer, and also checks whether it's NULL before trying to stop it. Second, in function gfs2_remount_fs, it was returning if an error was logged by either of the two functions for gfs2_make_fs_ro and _rw, which caused it to bypass the online uevent at the bottom of the function. This removes that bypass in favor of just running the whole function, then returning the error. That way, unmounts and remounts won't hang forever. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
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.