Merge tag 'io_uring-5.18-2022-04-14' of git://git.kernel.dk/linux-block

Pull io_uring fixes from Jens Axboe:

 - Ensure we check and -EINVAL any use of reserved or struct padding.

   Although we generally always do that, it's missed in two spots for
   resource updates, one for the ring fd registration from this merge
   window, and one for the extended arg. Make sure we have all of them
   handled. (Dylan)

 - A few fixes for the deferred file assignment (me, Pavel)

 - Add a feature flag for the deferred file assignment so apps can tell
   we handle it correctly (me)

 - Fix a small perf regression with the current file position fix in
   this merge window (me)

* tag 'io_uring-5.18-2022-04-14' of git://git.kernel.dk/linux-block:
  io_uring: abort file assignment prior to assigning creds
  io_uring: fix poll error reporting
  io_uring: fix poll file assign deadlock
  io_uring: use right issue_flags for splice/tee
  io_uring: verify pad field is 0 in io_get_ext_arg
  io_uring: verify resv is 0 in ringfd register/unregister
  io_uring: verify that resv2 is 0 in io_uring_rsrc_update2
  io_uring: move io_uring_rsrc_update2 validation
  io_uring: fix assign file locking issue
  io_uring: stop using io_wq_work as an fd placeholder
  io_uring: move apoll->events cache
  io_uring: io_kiocb_update_pos() should not touch file for non -1 offset
  io_uring: flag the fact that linked file assignment is sane

include/uapi/linux/io_uring.h

@@ -296,6 +296,7 @@ struct io_uring_params {
 #define IORING_FEAT_NATIVE_WORKERS	(1U << 9)
 #define IORING_FEAT_RSRC_TAGS		(1U << 10)
 #define IORING_FEAT_CQE_SKIP		(1U << 11)
+#define IORING_FEAT_LINKED_FILE		(1U << 12)
 
 /*
  * io_uring_register(2) opcodes and arguments