fs/proc/vmcore: convert vmcore_cb_lock into vmcore_mutex
We want to protect vmcore modifications from concurrent opening of
the vmcore, and also serialize vmcore modification.
(a) We can currently modify the vmcore after it was opened. This can happen
if a vmcoredd is added after the vmcore module was initialized and
already opened by user space. We want to fix that and prepare for
new code wanting to serialize against concurrent opening.
(b) To handle it cleanly we need to protect the modifications against
concurrent opening. As the modifications end up allocating memory and
can sleep, we cannot rely on the spinlock.
Let's convert the spinlock into a mutex to prepare for further changes.
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20241204125444.1734652-2-david@redhat.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
1 file changed
