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a49a2a1baa
Usage of vfs_test_lock() is somewhat confused. Documentation suggests
it is given a "lock" but this is not the case. It is given a struct
file_lock which contains some details of the sort of lock it should be
looking for.
In particular passing a "file_lock" containing fl_lmops or fl_ops is
meaningless and possibly confusing.
This is particularly problematic in lockd. nlmsvc_testlock() receives
an initialised "file_lock" from xdr-decode, including manager ops and an
owner. It then mistakenly passes this to vfs_test_lock() which might
replace the owner and the ops. This can lead to confusion when freeing
the lock.
The primary role of the 'struct file_lock' passed to vfs_test_lock() is
to report a conflicting lock that was found, so it makes more sense for
nlmsvc_testlock() to pass "conflock", which it uses for returning the
conflicting lock.
With this change, freeing of the lock is not confused and code in
__nlm4svc_proc_test() and __nlmsvc_proc_test() can be simplified.
Documentation for vfs_test_lock() is improved to reflect its real
purpose, and a WARN_ON_ONCE() is added to avoid a similar problem in the
future.
Reported-by: Olga Kornievskaia <okorniev@redhat.com>
Closes: https://lore.kernel.org/all/20251021130506.45065-1-okorniev@redhat.com
Signed-off-by: NeilBrown <neil@brown.name>
Fixes:
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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.