user/sven/linux.git/include/linux/io_uring.h, branch v5.9.8Linux Kernel
https://git.stealer.net/cgit.cgi/user/sven/linux.git/atom?h=v5.9.82020-11-01T11:47:01Zio_uring: don't rely on weak ->files references2020-11-01T11:47:01ZJens Axboeaxboe@kernel.dk2020-09-13T19:09:39Zurn:sha1:adb6bf5ea1ac14bc78bdd5fc0cbe232d97870169
commit 0f2122045b946241a9e549c2a76cea54fa58a7ff upstream.
Grab actual references to the files_struct. To avoid circular references
issues due to this, we add a per-task note that keeps track of what
io_uring contexts a task has used. When the tasks execs or exits its
assigned files, we cancel requests based on this tracking.
With that, we can grab proper references to the files table, and no
longer need to rely on stashing away ring_fd and ring_file to check
if the ring_fd may have been closed.
Cc: stable@vger.kernel.org # v5.5+
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>