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[Qemu-block] [PATCH v2 4/6] block/dirty-bitmap: explicitly lock bitmaps
From: |
John Snow |
Subject: |
[Qemu-block] [PATCH v2 4/6] block/dirty-bitmap: explicitly lock bitmaps with successors |
Date: |
Wed, 13 Feb 2019 18:23:54 -0500 |
Instead of implying a locked status, make it explicit.
Now, bitmaps in use by migration, NBD or backup operations
are all treated the same way with the same code paths.
Signed-off-by: John Snow <address@hidden>
Reviewed-by: Eric Blake <address@hidden>
---
block/dirty-bitmap.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index bb2e19e0d8..2042c62602 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -188,10 +188,8 @@ bool bdrv_dirty_bitmap_has_successor(BdrvDirtyBitmap
*bitmap)
return bitmap->successor;
}
-/* Both conditions disallow user-modification via QMP. */
bool bdrv_dirty_bitmap_user_locked(BdrvDirtyBitmap *bitmap) {
- return bdrv_dirty_bitmap_has_successor(bitmap) ||
- bdrv_dirty_bitmap_qmp_locked(bitmap);
+ return bdrv_dirty_bitmap_qmp_locked(bitmap);
}
void bdrv_dirty_bitmap_set_qmp_locked(BdrvDirtyBitmap *bitmap, bool qmp_locked)
@@ -266,8 +264,9 @@ int bdrv_dirty_bitmap_create_successor(BlockDriverState *bs,
child->disabled = bitmap->disabled;
bitmap->disabled = true;
- /* Install the successor and freeze the parent */
+ /* Install the successor and lock the parent */
bitmap->successor = child;
+ bitmap->qmp_locked = true;
return 0;
}
@@ -321,6 +320,7 @@ BdrvDirtyBitmap
*bdrv_dirty_bitmap_abdicate(BlockDriverState *bs,
bitmap->successor = NULL;
successor->persistent = bitmap->persistent;
bitmap->persistent = false;
+ bitmap->qmp_locked = false;
bdrv_release_dirty_bitmap(bs, bitmap);
return successor;
@@ -349,6 +349,7 @@ BdrvDirtyBitmap
*bdrv_reclaim_dirty_bitmap_locked(BlockDriverState *bs,
}
parent->disabled = successor->disabled;
+ parent->qmp_locked = false;
bdrv_release_dirty_bitmap_locked(successor);
parent->successor = NULL;
--
2.17.2
- [Qemu-block] [PATCH v2 2/6] block/dirty-bitmaps: rename frozen predicate helper, (continued)
[Qemu-block] [PATCH v2 3/6] block/dirty-bitmap: change semantics of enabled predicate, John Snow, 2019/02/13
[Qemu-block] [PATCH v2 4/6] block/dirty-bitmap: explicitly lock bitmaps with successors,
John Snow <=
[Qemu-block] [PATCH v2 5/6] block/dirty-bitmaps: unify qmp_locked and user_locked calls, John Snow, 2019/02/13
[Qemu-block] [PATCH v2 6/6] block/dirty-bitmaps: move comment block, John Snow, 2019/02/13