block/nvme: optimize the performance of nvme driver based on vfio-pci

[qemu.git] / block / cloop.c

diff --git a/block/cloop.c b/block/cloop.c
index 7b75f7ef7b63db60adb186c5ffe9b2e7c5ca01cc..df2b85f7234203d9a457e38f7778b23af895a4cf 100644 (file)
--- a/block/cloop.c
+++ b/block/cloop.c
@@ -23,6 +23,7 @@
  */
 #include "qemu/osdep.h"
 #include "qapi/error.h"
+#include "qemu/error-report.h"
 #include "qemu-common.h"
 #include "block/block_int.h"
 #include "qemu/module.h"
@@ -66,7 +67,16 @@ static int cloop_open(BlockDriverState *bs, QDict *options, int flags,
     uint32_t offsets_size, max_compressed_block_size = 1, i;
     int ret;
 
-    bs->read_only = true;
+    ret = bdrv_apply_auto_read_only(bs, NULL, errp);
+    if (ret < 0) {
+        return ret;
+    }
+
+    bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
+                               false, errp);
+    if (!bs->file) {
+        return -EINVAL;
+    }
 
     /* read header */
     ret = bdrv_pread(bs->file, 128, &s->block_size, 4);
@@ -284,6 +294,7 @@ static BlockDriver bdrv_cloop = {
     .instance_size  = sizeof(BDRVCloopState),
     .bdrv_probe     = cloop_probe,
     .bdrv_open      = cloop_open,
+    .bdrv_child_perm     = bdrv_format_default_perms,
     .bdrv_refresh_limits = cloop_refresh_limits,
     .bdrv_co_preadv = cloop_co_preadv,
     .bdrv_close     = cloop_close,