Merge tag 'io_uring-6.15-20250418' of git://git.kernel.dk/linux

Pull io_uring fixes from Jens Axboe:

 - Correctly cap iov_iter->nr_segs for imports of registered buffers,
   both kbuf and normal ones.

   Three cleanups to make it saner first, then two fixes for each of the
   buffer types.

   This fixes a performance regression where partial buffer usage
   doesn't trim the tail number of segments, leading the block layer to
   iterate the IOs to check if it needs splitting.

 - Two patches tweaking the newly introduced zero-copy rx API, mostly to
   keep the API consistent once we add multiple interface queues per
   ring support in the 6.16 release.

 - zc rx unmapping fix for a dead device

* tag 'io_uring-6.15-20250418' of git://git.kernel.dk/linux:
  io_uring/zcrx: fix late dma unmap for a dead dev
  io_uring/rsrc: ensure segments counts are correct on kbuf buffers
  io_uring/rsrc: send exact nr_segs for fixed buffer
  io_uring/rsrc: refactor io_import_fixed
  io_uring/rsrc: separate kbuf offset adjustments
  io_uring/rsrc: don't skip offset calculation
  io_uring/zcrx: add pp to ifq conversion helper
  io_uring/zcrx: return ifq id to the user

include/uapi/linux/io_uring.h

@@ -1010,7 +1010,9 @@ struct io_uring_zcrx_ifq_reg {
 	__u64	region_ptr; /* struct io_uring_region_desc * */
 
 	struct io_uring_zcrx_offsets offsets;
-	__u64	__resv[4];
+	__u32	zcrx_id;
+	__u32	__resv2;
+	__u64	__resv[3];
 };
 
 #ifdef __cplusplus