[PATCH 2/5] vduse-blk: Don't unlink the reconnect file if device exists

[Xie Yongji <xieyongji@bytedance.com>]

We should not unlink the reconnect file if vduse_dev_destroy()
fails with -EBUSY which means the VDUSE device has not been
removed from the vDPA bus. Otherwise, we might fail on
the reconnection later.

Fixes: 730abef0e873 ("libvduse: Add support for reconnecting")
Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
---
 block/export/vduse-blk.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/block/export/vduse-blk.c b/block/export/vduse-blk.c
index 3b10349173..c3a89894ae 100644
--- a/block/export/vduse-blk.c
+++ b/block/export/vduse-blk.c
@@ -316,12 +316,15 @@ static int vduse_blk_exp_create(BlockExport *exp, BlockExportOptions *opts,
 static void vduse_blk_exp_delete(BlockExport *exp)
 {
     VduseBlkExport *vblk_exp = container_of(exp, VduseBlkExport, export);
+    int ret;
 
     blk_remove_aio_context_notifier(exp->blk, blk_aio_attached, blk_aio_detach,
                                     vblk_exp);
     blk_set_dev_ops(exp->blk, NULL, NULL);
-    vduse_dev_destroy(vblk_exp->dev);
-    unlink(vblk_exp->recon_file);
+    ret = vduse_dev_destroy(vblk_exp->dev);
+    if (ret != -EBUSY) {
+        unlink(vblk_exp->recon_file);
+    }
     g_free(vblk_exp->recon_file);
 }
 
-- 
2.20.1