io_uring: kill io_uring_flush()

This was always a weird work-around or file referencing, and we don't
need it anymore. Get rid of it.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 7cad82b..766df21 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -8914,52 +8914,6 @@ void __io_uring_task_cancel(void)
        __io_uring_free(current);
 }
 
-static int io_uring_flush(struct file *file, void *data)
-{
-       struct io_uring_task *tctx = current->io_uring;
-       struct io_ring_ctx *ctx = file->private_data;
-
-       /* Ignore helper thread files exit */
-       if (current->flags & PF_IO_WORKER)
-               return 0;
-
-       if (fatal_signal_pending(current) || (current->flags & PF_EXITING)) {
-               io_uring_cancel_task_requests(ctx, NULL);
-               io_req_caches_free(ctx);
-       }
-
-       io_run_ctx_fallback(ctx);
-
-       if (!tctx)
-               return 0;
-
-       /* we should have cancelled and erased it before PF_EXITING */
-       WARN_ON_ONCE((current->flags & PF_EXITING) &&
-                    xa_load(&tctx->xa, (unsigned long)file));
-
-       /*
-        * fput() is pending, will be 2 if the only other ref is our potential
-        * task file note. If the task is exiting, drop regardless of count.
-        */
-       if (atomic_long_read(&file->f_count) != 2)
-               return 0;
-
-       if (ctx->flags & IORING_SETUP_SQPOLL) {
-               /* there is only one file note, which is owned by sqo_task */
-               WARN_ON_ONCE(ctx->sqo_task != current &&
-                            xa_load(&tctx->xa, (unsigned long)file));
-               /* sqo_dead check is for when this happens after cancellation */
-               WARN_ON_ONCE(ctx->sqo_task == current && !ctx->sqo_dead &&
-                            !xa_load(&tctx->xa, (unsigned long)file));
-
-               io_disable_sqo_submit(ctx);
-       }
-
-       if (!(ctx->flags & IORING_SETUP_SQPOLL) || ctx->sqo_task == current)
-               io_uring_del_task_file(file);
-       return 0;
-}
-
 static void *io_uring_validate_mmap_request(struct file *file,
                                            loff_t pgoff, size_t sz)
 {
@@ -9291,7 +9245,6 @@ static void io_uring_show_fdinfo(struct seq_file *m, struct file *f)
 
 static const struct file_operations io_uring_fops = {
        .release        = io_uring_release,
-       .flush          = io_uring_flush,
        .mmap           = io_uring_mmap,
 #ifndef CONFIG_MMU
        .get_unmapped_area = io_uring_nommu_get_unmapped_area,