From 58a209c43747c311ceb6f6a6f3e5904b354efce2 Mon Sep 17 00:00:00 2001
From: Kevin Wolf <kwolf@redhat.com>
Date: Thu, 25 Oct 2018 14:18:58 +0100
Subject: [PATCH] file-posix: Avoid aio_worker() for QEMU_AIO_COPY_RANGE

aio_worker() doesn't add anything interesting, it's only a useless
indirection. Call the handler function directly instead.

As we know that this handler function is only called from coroutine
context and the coroutine stays around until the worker thread finishes,
we can keep RawPosixAIOData on the stack.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/file-posix.c | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/block/file-posix.c b/block/file-posix.c
index 7c5121efc9..e502ba7e15 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -1572,8 +1572,9 @@ static off_t copy_file_range(int in_fd, off_t *in_off, int out_fd,
 }
 #endif
 
-static ssize_t handle_aiocb_copy_range(RawPosixAIOData *aiocb)
+static int handle_aiocb_copy_range(void *opaque)
 {
+    RawPosixAIOData *aiocb = opaque;
     uint64_t bytes = aiocb->aio_nbytes;
     off_t in_off = aiocb->aio_offset;
     off_t out_off = aiocb->copy_range.aio_offset2;
@@ -1810,8 +1811,6 @@ static int aio_worker(void *arg)
         ret = handle_aiocb_write_zeroes_unmap(aiocb);
         break;
     case QEMU_AIO_COPY_RANGE:
-        ret = handle_aiocb_copy_range(aiocb);
-        break;
     case QEMU_AIO_TRUNCATE:
         g_assert_not_reached();
     default:
@@ -2714,6 +2713,7 @@ static int coroutine_fn raw_co_copy_range_to(BlockDriverState *bs,
                                              BdrvRequestFlags read_flags,
                                              BdrvRequestFlags write_flags)
 {
+    RawPosixAIOData acb;
     BDRVRawState *s = bs->opaque;
     BDRVRawState *src_s;
 
@@ -2726,8 +2726,20 @@ static int coroutine_fn raw_co_copy_range_to(BlockDriverState *bs,
     if (fd_open(src->bs) < 0 || fd_open(dst->bs) < 0) {
         return -EIO;
     }
-    return paio_submit_co_full(bs, src_s->fd, src_offset, s->fd, dst_offset,
-                               NULL, bytes, QEMU_AIO_COPY_RANGE);
+
+    acb = (RawPosixAIOData) {
+        .bs             = bs,
+        .aio_type       = QEMU_AIO_COPY_RANGE,
+        .aio_fildes     = src_s->fd,
+        .aio_offset     = src_offset,
+        .aio_nbytes     = bytes,
+        .copy_range     = {
+            .aio_fd2        = s->fd,
+            .aio_offset2    = dst_offset,
+        },
+    };
+
+    return raw_thread_pool_submit(bs, handle_aiocb_copy_range, &acb);
 }
 
 BlockDriver bdrv_file = {