[Qemu-devel] [PATCH v2 02/18] block: store actual flags in bs->open_flags

[Paolo Bonzini]

The passed flags are changed slightly before passing them to
bdrv_open.  Store the same flags in bs->open_flags, so that
they are used correctly in bdrv.  In addition, this way we
will be able to query them and get back consistent values.

Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
 block.c |   38 ++++++++++++++++++--------------------
 1 files changed, 18 insertions(+), 20 deletions(-)

diff --git a/block.c b/block.c
index c5a85a2..a1d2433 100644
--- a/block.c
+++ b/block.c
@@ -565,18 +565,30 @@ void bdrv_disable_copy_on_read(BlockDriverState *bs)
 static int bdrv_open_common(BlockDriverState *bs, const char *filename,
     int flags, BlockDriver *drv)
 {
-    int ret, open_flags;
+    int ret;
 
     assert(drv != NULL);
 
     trace_bdrv_open_common(bs, filename, flags, drv->format_name);
 
+    /*
+     * Clear flags that are internal to the block layer before opening the
+     * image.
+     */
+    bs->open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
+
+    /*
+     * Snapshots should be writable.
+     */
+    if (bs->is_temporary) {
+        bs->open_flags |= BDRV_O_RDWR;
+    }
+
     bs->file = NULL;
     bs->total_sectors = 0;
     bs->encrypted = 0;
     bs->valid_key = 0;
     bs->sg = 0;
-    bs->open_flags = flags;
     bs->growable = 0;
     bs->buffer_alignment = 512;
 
@@ -596,29 +608,15 @@ static int bdrv_open_common(BlockDriverState *bs, const 
char *filename,
     bs->opaque = g_malloc0(drv->instance_size);
 
     bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB);
-
-    /*
-     * Clear flags that are internal to the block layer before opening the
-     * image.
-     */
-    open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
-
-    /*
-     * Snapshots should be writable.
-     */
-    if (bs->is_temporary) {
-        open_flags |= BDRV_O_RDWR;
-    }
-
-    bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR);
+    bs->keep_read_only = bs->read_only = !(bs->open_flags & BDRV_O_RDWR);
 
     /* Open the image, either directly or using a protocol */
     if (drv->bdrv_file_open) {
-        ret = drv->bdrv_file_open(bs, filename, open_flags);
+        ret = drv->bdrv_file_open(bs, filename, bs->open_flags);
     } else {
-        ret = bdrv_file_open(&bs->file, filename, open_flags);
+        ret = bdrv_file_open(&bs->file, filename, bs->open_flags);
         if (ret >= 0) {
-            ret = drv->bdrv_open(bs, open_flags);
+            ret = drv->bdrv_open(bs, bs->open_flags);
         }
     }
 
-- 
1.7.7.6