Introduce a mapping from ctx to all tctx, and using that removes
file notes, i.e. taking a io_uring file note previously stored in
task->io_uring->xa. It's needed because we don't free io_uring ctx
until all submitters die/exec, and it became worse after killing
->flush(). There are rough corner in a form of not behaving nicely,
I'll address in follow-up patches.
The torture is as simple as below. It will get OOM in no time. Also,
I plan to use it to fix recently broken cancellations.
while (1) {
assert(!io_uring_queue_init(8, &ring, 0));
io_uring_queue_exit(&ring);
}
v2: rebase (resolve conflicts)
drop taken 2 patches
v3: use jiffies in 6/6 (Jens)
Pavel Begunkov (6):
io_uring: make del_task_file more forgiving
io_uring: introduce ctx to tctx back map
io_uring: do ctx initiated file note removal
io_uring: don't take task ring-file notes
io_uring: index io_uring->xa by ctx not file
io_uring: warn when ring exit takes too long
fs/io_uring.c | 131 +++++++++++++++++++++++++++++++--------
include/linux/io_uring.h | 2 +-
2 files changed, 106 insertions(+), 27 deletions(-)
--
2.24.0
