Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging

Block layer patches for 2.11.0-rc2

# gpg: Signature made Tue 21 Nov 2017 15:09:12 GMT
# gpg:                using RSA key 0x7F09B272C88F2FD6
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>"
# Primary key fingerprint: DC3D EB15 9A9A F95D 3D74  56FE 7F09 B272 C88F 2FD6

* remotes/kevin/tags/for-upstream:
  iotests: Fix 176 on 32-bit host
  block: Close a BlockDriverState completely even when bs->drv is NULL
  block: Error out on load_vm with active dirty bitmaps
  block: Add errp to bdrv_all_goto_snapshot()
  block: Add errp to bdrv_snapshot_goto()
  block: Don't request I/O permission with BDRV_O_NO_IO
  block: Don't use BLK_PERM_CONSISTENT_READ for format probing

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 32 insertions, 30 deletions

diff --git a/block.c b/block.c
index 6c8ef98dfa..9a1a0d1e73 100644
--- a/block.c
+++ b/block.c
@@ -2579,7 +2579,10 @@ static BlockDriverState *bdrv_open_inherit(const char *filename,
             goto fail;
         }
         if (file_bs != NULL) {
-            file = blk_new(BLK_PERM_CONSISTENT_READ, BLK_PERM_ALL);
+            /* Not requesting BLK_PERM_CONSISTENT_READ because we're only
+             * looking at the header to guess the image format. This works even
+             * in cases where a guest would not see a consistent state. */
+            file = blk_new(0, BLK_PERM_ALL);
             blk_insert_bs(file, file_bs, &local_err);
             bdrv_unref(file_bs);
             if (local_err) {
@@ -3195,6 +3198,7 @@ void bdrv_reopen_abort(BDRVReopenState *reopen_state)
 static void bdrv_close(BlockDriverState *bs)
 {
     BdrvAioNotifier *ban, *ban_next;
+    BdrvChild *child, *next;
 
     assert(!bs->job);
     assert(!bs->refcnt);
@@ -3204,43 +3208,41 @@ static void bdrv_close(BlockDriverState *bs)
     bdrv_drain(bs); /* in case flush left pending I/O */
 
     if (bs->drv) {
-        BdrvChild *child, *next;
-
         bs->drv->bdrv_close(bs);
         bs->drv = NULL;
+    }
 
-        bdrv_set_backing_hd(bs, NULL, &error_abort);
+    bdrv_set_backing_hd(bs, NULL, &error_abort);
 
-        if (bs->file != NULL) {
-            bdrv_unref_child(bs, bs->file);
-            bs->file = NULL;
-        }
+    if (bs->file != NULL) {
+        bdrv_unref_child(bs, bs->file);
+        bs->file = NULL;
+    }
 
-        QLIST_FOREACH_SAFE(child, &bs->children, next, next) {
-            /* TODO Remove bdrv_unref() from drivers' close function and use
-             * bdrv_unref_child() here */
-            if (child->bs->inherits_from == bs) {
-                child->bs->inherits_from = NULL;
-            }
-            bdrv_detach_child(child);
+    QLIST_FOREACH_SAFE(child, &bs->children, next, next) {
+        /* TODO Remove bdrv_unref() from drivers' close function and use
+         * bdrv_unref_child() here */
+        if (child->bs->inherits_from == bs) {
+            child->bs->inherits_from = NULL;
         }
-
-        g_free(bs->opaque);
-        bs->opaque = NULL;
-        atomic_set(&bs->copy_on_read, 0);
-        bs->backing_file[0] = '\0';
-        bs->backing_format[0] = '\0';
-        bs->total_sectors = 0;
-        bs->encrypted = false;
-        bs->sg = false;
-        QDECREF(bs->options);
-        QDECREF(bs->explicit_options);
-        bs->options = NULL;
-        bs->explicit_options = NULL;
-        QDECREF(bs->full_open_options);
-        bs->full_open_options = NULL;
+        bdrv_detach_child(child);
     }
 
+    g_free(bs->opaque);
+    bs->opaque = NULL;
+    atomic_set(&bs->copy_on_read, 0);
+    bs->backing_file[0] = '\0';
+    bs->backing_format[0] = '\0';
+    bs->total_sectors = 0;
+    bs->encrypted = false;
+    bs->sg = false;
+    QDECREF(bs->options);
+    QDECREF(bs->explicit_options);
+    bs->options = NULL;
+    bs->explicit_options = NULL;
+    QDECREF(bs->full_open_options);
+    bs->full_open_options = NULL;
+
     bdrv_release_named_dirty_bitmaps(bs);
     assert(QLIST_EMPTY(&bs->dirty_bitmaps));