io_uring: refactor io_resubmit_prep()

It's awkward to pass return a value into a function for it to return it
back. Check it at the caller site and clean up io_resubmit_prep() a bit.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 4a8900d..be2760a 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2689,17 +2689,16 @@ static void io_complete_rw_common(struct kiocb *kiocb, long res,
 }
 
 #ifdef CONFIG_BLOCK
-static bool io_resubmit_prep(struct io_kiocb *req, int error)
+static bool io_resubmit_prep(struct io_kiocb *req)
 {
        struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs;
        ssize_t ret = -ECANCELED;
        struct iov_iter iter;
        int rw;
 
-       if (error) {
-               ret = error;
-               goto end_req;
-       }
+       /* already prepared */
+       if (req->async_data)
+               return true;
 
        switch (req->opcode) {
        case IORING_OP_READV:
@@ -2715,22 +2714,16 @@ static bool io_resubmit_prep(struct io_kiocb *req, int error)
        default:
                printk_once(KERN_WARNING "io_uring: bad opcode in resubmit %d\n",
                                req->opcode);
-               goto end_req;
+               return false;
        }
 
-       if (!req->async_data) {
-               ret = io_import_iovec(rw, req, &iovec, &iter, false);
-               if (ret < 0)
-                       goto end_req;
-               ret = io_setup_async_rw(req, iovec, inline_vecs, &iter, false);
-               if (!ret)
-                       return true;
-               kfree(iovec);
-       } else {
+       ret = io_import_iovec(rw, req, &iovec, &iter, false);
+       if (ret < 0)
+               return false;
+       ret = io_setup_async_rw(req, iovec, inline_vecs, &iter, false);
+       if (!ret)
                return true;
-       }
-end_req:
-       req_set_fail_links(req);
+       kfree(iovec);
        return false;
 }
 #endif
@@ -2751,12 +2744,12 @@ static bool io_rw_reissue(struct io_kiocb *req, long res)
 
        ret = io_sq_thread_acquire_mm_files(req->ctx, req);
 
-       if (io_resubmit_prep(req, ret)) {
+       if (!ret && io_resubmit_prep(req)) {
                refcount_inc(&req->refs);
                io_queue_async_work(req);
                return true;
        }
-
+       req_set_fail_links(req);
 #endif
        return false;
 }