Merge tag 'for-6.14/io_uring-20250119' of git://git.kernel.dk/linux

Pull io_uring updates from Jens Axboe:
 "Not a lot in terms of features this time around, mostly just cleanups
  and code consolidation:

   - Support for PI meta data read/write via io_uring, with NVMe and
     SCSI covered

   - Cleanup the per-op structure caching, making it consistent across
     various command types

   - Consolidate the various user mapped features into a concept called
     regions, making the various users of that consistent

   - Various cleanups and fixes"

* tag 'for-6.14/io_uring-20250119' of git://git.kernel.dk/linux: (56 commits)
  io_uring/fdinfo: fix io_uring_show_fdinfo() misuse of ->d_iname
  io_uring: reuse io_should_terminate_tw() for cmds
  io_uring: Factor out a function to parse restrictions
  io_uring/rsrc: require cloned buffers to share accounting contexts
  io_uring: simplify the SQPOLL thread check when cancelling requests
  io_uring: expose read/write attribute capability
  io_uring/rw: don't gate retry on completion context
  io_uring/rw: handle -EAGAIN retry at IO completion time
  io_uring/rw: use io_rw_recycle() from cleanup path
  io_uring/rsrc: simplify the bvec iter count calculation
  io_uring: ensure io_queue_deferred() is out-of-line
  io_uring/rw: always clear ->bytes_done on io_async_rw setup
  io_uring/rw: use NULL for rw->free_iovec assigment
  io_uring/rw: don't mask in f_iocb_flags
  io_uring/msg_ring: Drop custom destructor
  io_uring: Move old async data allocation helper to header
  io_uring/rw: Allocate async data through helper
  io_uring/net: Allocate msghdr async data through helper
  io_uring/uring_cmd: Allocate async data through generic helper
  io_uring/poll: Allocate apoll with generic alloc_cache helper
  ...

1 files changed, 13 insertions, 0 deletions

diff --git a/io_uring/alloc_cache.h b/io_uring/alloc_cache.h
index b7a38a2069cf..a3a8cfec32ce 100644
--- a/io_uring/alloc_cache.h
+++ b/io_uring/alloc_cache.h
@@ -30,6 +30,19 @@ static inline void *io_alloc_cache_get(struct io_alloc_cache *cache)
 	return NULL;
 }
 
+static inline void *io_cache_alloc(struct io_alloc_cache *cache, gfp_t gfp,
+				   void (*init_once)(void *obj))
+{
+	if (unlikely(!cache->nr_cached)) {
+		void *obj = kmalloc(cache->elem_size, gfp);
+
+		if (obj && init_once)
+			init_once(obj);
+		return obj;
+	}
+	return io_alloc_cache_get(cache);
+}
+
 /* returns false if the cache was initialized properly */
 static inline bool io_alloc_cache_init(struct io_alloc_cache *cache,
 				       unsigned max_nr, size_t size)