[PATCH v6 1/5] io_uring: call io_get_fixed_rsrc_ref for buffers

[Bijan Mottahedeh <bijan.mottahedeh@xxxxxxxxxx>]

io_get_fixed_rsrc_ref() must be called for both buffers and files.

Signed-off-by: Bijan Mottahedeh <bijan.mottahedeh@xxxxxxxxxx>
---
 fs/io_uring.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 5bfcb72..416c350 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1068,12 +1068,11 @@ static inline void io_clean_op(struct io_kiocb *req)
 		__io_clean_op(req);
 }
 
-static inline void io_set_resource_node(struct io_kiocb *req)
+static inline void io_get_fixed_rsrc_ref(struct io_kiocb *req,
+					 struct fixed_rsrc_data *rsrc_data)
 {
-	struct io_ring_ctx *ctx = req->ctx;
-
 	if (!req->fixed_rsrc_refs) {
-		req->fixed_rsrc_refs = &ctx->file_data->node->refs;
+		req->fixed_rsrc_refs = &rsrc_data->node->refs;
 		percpu_ref_get(req->fixed_rsrc_refs);
 	}
 }
@@ -2940,6 +2939,9 @@ static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	req->rw.addr = READ_ONCE(sqe->addr);
 	req->rw.len = READ_ONCE(sqe->len);
 	req->buf_index = READ_ONCE(sqe->buf_index);
+	if (req->opcode == IORING_OP_READ_FIXED ||
+	    req->opcode == IORING_OP_WRITE_FIXED)
+		io_get_fixed_rsrc_ref(req, ctx->buf_data);
 	return 0;
 }
 
@@ -6439,7 +6441,7 @@ static struct file *io_file_get(struct io_submit_state *state,
 			return NULL;
 		fd = array_index_nospec(fd, ctx->nr_user_files);
 		file = io_file_from_index(ctx, fd);
-		io_set_resource_node(req);
+		io_get_fixed_rsrc_ref(req, ctx->file_data);
 	} else {
 		trace_io_uring_file_get(ctx, fd);
 		file = __io_file_get(state, fd);
-- 
1.8.3.1