[PATCH 6/7] io_uring/rsrc: keep one global dummy_ubuf

[Pavel Begunkov <asml.silence@xxxxxxxxx>]

We set empty registered buffers to dummy_ubuf as an optimisation.
Currently, we allocate the dummy entry for each ring, whenever we can
simply have one global instance.

We're casting out const on assignment, it's fine as we're not going to
change the content of the dummy, the constness gives us an extra layer
of protection if sth ever goes wrong.

Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
---
 io_uring/io_uring.c |  9 ---------
 io_uring/rsrc.c     | 14 ++++++++++----
 2 files changed, 10 insertions(+), 13 deletions(-)

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index e57d00939ab9..a7a4d637aee0 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -290,13 +290,6 @@ static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
 		goto err;
 	if (io_alloc_hash_table(&ctx->cancel_table_locked, hash_bits))
 		goto err;
-
-	ctx->dummy_ubuf = kzalloc(sizeof(*ctx->dummy_ubuf), GFP_KERNEL);
-	if (!ctx->dummy_ubuf)
-		goto err;
-	/* set invalid range, so io_import_fixed() fails meeting it */
-	ctx->dummy_ubuf->ubuf = -1UL;
-
 	if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free,
 			    0, GFP_KERNEL))
 		goto err;
@@ -335,7 +328,6 @@ static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
 	INIT_WQ_LIST(&ctx->submit_state.compl_reqs);
 	return ctx;
 err:
-	kfree(ctx->dummy_ubuf);
 	kfree(ctx->cancel_table.hbs);
 	kfree(ctx->cancel_table_locked.hbs);
 	kfree(ctx->io_bl);
@@ -2897,7 +2889,6 @@ static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx)
 		io_wq_put_hash(ctx->hash_map);
 	kfree(ctx->cancel_table.hbs);
 	kfree(ctx->cancel_table_locked.hbs);
-	kfree(ctx->dummy_ubuf);
 	kfree(ctx->io_bl);
 	xa_destroy(&ctx->io_bl_xa);
 	kfree(ctx);
diff --git a/io_uring/rsrc.c b/io_uring/rsrc.c
index 5e8fdd9b8ca6..d9c853d10587 100644
--- a/io_uring/rsrc.c
+++ b/io_uring/rsrc.c
@@ -33,6 +33,12 @@ static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov,
 #define IORING_MAX_FIXED_FILES	(1U << 20)
 #define IORING_MAX_REG_BUFFERS	(1U << 14)
 
+static const struct io_mapped_ubuf dummy_ubuf = {
+	/* set invalid range, so io_import_fixed() fails meeting it */
+	.ubuf = -1UL,
+	.ubuf_end = 0,
+};
+
 int __io_account_mem(struct user_struct *user, unsigned long nr_pages)
 {
 	unsigned long page_limit, cur_pages, new_pages;
@@ -132,7 +138,7 @@ static void io_buffer_unmap(struct io_ring_ctx *ctx, struct io_mapped_ubuf **slo
 	struct io_mapped_ubuf *imu = *slot;
 	unsigned int i;
 
-	if (imu != ctx->dummy_ubuf) {
+	if (imu != &dummy_ubuf) {
 		for (i = 0; i < imu->nr_bvecs; i++)
 			unpin_user_page(imu->bvec[i].bv_page);
 		if (imu->acct_pages)
@@ -459,14 +465,14 @@ static int __io_sqe_buffers_update(struct io_ring_ctx *ctx,
 			break;
 
 		i = array_index_nospec(up->offset + done, ctx->nr_user_bufs);
-		if (ctx->user_bufs[i] != ctx->dummy_ubuf) {
+		if (ctx->user_bufs[i] != &dummy_ubuf) {
 			err = io_queue_rsrc_removal(ctx->buf_data, i,
 						    ctx->user_bufs[i]);
 			if (unlikely(err)) {
 				io_buffer_unmap(ctx, &imu);
 				break;
 			}
-			ctx->user_bufs[i] = ctx->dummy_ubuf;
+			ctx->user_bufs[i] = (struct io_mapped_ubuf *)&dummy_ubuf;
 		}
 
 		ctx->user_bufs[i] = imu;
@@ -1077,7 +1083,7 @@ static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov,
 	int ret, nr_pages, i;
 	struct folio *folio = NULL;
 
-	*pimu = ctx->dummy_ubuf;
+	*pimu = (struct io_mapped_ubuf *)&dummy_ubuf;
 	if (!iov->iov_base)
 		return 0;
 
-- 
2.41.0