Merge tag 'io_uring-6.15-20250403' of git://git.kernel.dk/linux

Pull more io_uring updates from Jens Axboe:
 "Set of fixes/updates for io_uring that should go into this release.

  The ublk bits could've gone via either tree - usually I put them in
  block, but they got a bit mixed this series with the zero-copy
  supported that ended up dipping into both trees.

  This contains:

   - Fix for sendmsg zc, include in pinned pages accounting like we do
     for the other zc types

   - Series for ublk fixing request aborting, doing various little
     cleanups, fixing some zc issues, and adding queue_rqs support

   - Another ublk series doing some code cleanups

   - Series cleaning up the io_uring send path, mostly in preparation
     for registered buffers

   - Series doing little MSG_RING cleanups

   - Fix for the newly added zc rx, fixing len being 0 for the last
     invocation of the callback

   - Add vectored registered buffer support for ublk. With that, then
     ublk also supports this feature in the kernel revision where it
     could generically introduced for rw/net

   - A bunch of selftest additions for ublk. This is the majority of the
     diffstat

   - Silence a KCSAN data race warning for io-wq

   - Various little cleanups and fixes"

* tag 'io_uring-6.15-20250403' of git://git.kernel.dk/linux: (44 commits)
  io_uring: always do atomic put from iowq
  selftests: ublk: enable zero copy for stripe target
  io_uring: support vectored kernel fixed buffer
  block: add for_each_mp_bvec()
  io_uring: add validate_fixed_range() for validate fixed buffer
  selftests: ublk: kublk: fix an error log line
  selftests: ublk: kublk: use ioctl-encoded opcodes
  io_uring/zcrx: return early from io_zcrx_recv_skb if readlen is 0
  io_uring/net: avoid import_ubuf for regvec send
  io_uring/rsrc: check size when importing reg buffer
  io_uring: cleanup {g,s]etsockopt sqe reading
  io_uring: hide caches sqes from drivers
  io_uring: make zcrx depend on CONFIG_IO_URING
  io_uring: add req flag invariant build assertion
  Documentation: ublk: remove dead footnote
  selftests: ublk: specify io_cmd_buf pointer type
  ublk: specify io_cmd_buf pointer type
  io_uring: don't pass ctx to tw add remote helper
  io_uring/msg: initialise msg request opcode
  io_uring/msg: rename io_double_lock_ctx()
  ...

include/uapi/linux/ublk_cmd.h

@@ -410,6 +410,29 @@ struct ublk_param_dma_align {
 	__u8	pad[4];
 };
 
+#define UBLK_MIN_SEGMENT_SIZE   4096
+/*
+ * If any one of the three segment parameter is set as 0, the behavior is
+ * undefined.
+ */
+struct ublk_param_segment {
+	/*
+	 * seg_boundary_mask + 1 needs to be power_of_2(), and the sum has
+	 * to be >= UBLK_MIN_SEGMENT_SIZE(4096)
+	 */
+	__u64 	seg_boundary_mask;
+
+	/*
+	 * max_segment_size could be override by virt_boundary_mask, so be
+	 * careful when setting both.
+	 *
+	 * max_segment_size has to be >= UBLK_MIN_SEGMENT_SIZE(4096)
+	 */
+	__u32 	max_segment_size;
+	__u16 	max_segments;
+	__u8	pad[2];
+};
+
 struct ublk_params {
 	/*
 	 * Total length of parameters, userspace has to set 'len' for both
@@ -423,6 +446,7 @@ struct ublk_params {
 #define UBLK_PARAM_TYPE_DEVT            (1 << 2)
 #define UBLK_PARAM_TYPE_ZONED           (1 << 3)
 #define UBLK_PARAM_TYPE_DMA_ALIGN       (1 << 4)
+#define UBLK_PARAM_TYPE_SEGMENT         (1 << 5)
 	__u32	types;			/* types of parameter included */
 
 	struct ublk_param_basic		basic;
@@ -430,6 +454,7 @@ struct ublk_params {
 	struct ublk_param_devt		devt;
 	struct ublk_param_zoned	zoned;
 	struct ublk_param_dma_align	dma;
+	struct ublk_param_segment	seg;
 };
 
 #endif