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[PATCH v3 03/33] block: Add BdrvChildRole and BdrvChildRoleBits
From: |
Max Reitz |
Subject: |
[PATCH v3 03/33] block: Add BdrvChildRole and BdrvChildRoleBits |
Date: |
Tue, 18 Feb 2020 13:42:12 +0100 |
This mask will supplement BdrvChildClass when it comes to what role (or
combination of roles) a child takes for its parent. It consists of
BdrvChildRoleBits values (which is an enum).
Because empty enums are not allowed, let us just start with it filled.
Signed-off-by: Max Reitz <address@hidden>
---
include/block/block.h | 38 ++++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/include/block/block.h b/include/block/block.h
index fd89eb6c75..8c23948d08 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -268,6 +268,44 @@ enum {
DEFAULT_PERM_UNCHANGED = BLK_PERM_ALL & ~DEFAULT_PERM_PASSTHROUGH,
};
+enum BdrvChildRoleBits {
+ /* Child stores data */
+ BDRV_CHILD_DATA = (1 << 0),
+
+ /* Child stores metadata */
+ BDRV_CHILD_METADATA = (1 << 1),
+
+ /*
+ * A child to which the parent forwards all reads and writes. It
+ * must present exactly the same visible data as the parent.
+ * Any node may have at most one filtered child at a time.
+ */
+ BDRV_CHILD_FILTERED = (1 << 2),
+
+ /*
+ * Child from which to read all data that isn’t allocated in the
+ * parent (i.e., the backing child); such data is copied to the
+ * parent through COW (and optionally COR).
+ */
+ BDRV_CHILD_COW = (1 << 3),
+
+ /*
+ * The primary child. For most drivers, this is the child whose
+ * filename applies best to the parent node.
+ * Each parent must give this flag to no more than one child at a
+ * time.
+ */
+ BDRV_CHILD_PRIMARY = (1 << 4),
+
+ /* Useful combination of flags */
+ BDRV_CHILD_IMAGE = BDRV_CHILD_DATA
+ | BDRV_CHILD_METADATA
+ | BDRV_CHILD_PRIMARY,
+};
+
+/* Mask of BdrvChildRoleBits values */
+typedef unsigned int BdrvChildRole;
+
char *bdrv_perm_names(uint64_t perm);
uint64_t bdrv_qapi_perm_to_blk_perm(BlockPermission qapi_perm);
--
2.24.1
- [PATCH v3 00/33] block: Introduce real BdrvChildRole, Max Reitz, 2020/02/18
- [PATCH v3 01/33] block: Add BlockDriver.is_format, Max Reitz, 2020/02/18
- [PATCH v3 03/33] block: Add BdrvChildRole and BdrvChildRoleBits,
Max Reitz <=
- [PATCH v3 05/33] block: Pass BdrvChildRole to bdrv_child_perm(), Max Reitz, 2020/02/18
- [PATCH v3 04/33] block: Add BdrvChildRole to BdrvChild, Max Reitz, 2020/02/18
- [PATCH v3 02/33] block: Rename BdrvChildRole to BdrvChildClass, Max Reitz, 2020/02/18
- [PATCH v3 06/33] block: Pass BdrvChildRole to .inherit_options(), Max Reitz, 2020/02/18
- [PATCH v3 07/33] block: Pass parent_is_format to .inherit_options(), Max Reitz, 2020/02/18
- [PATCH v3 08/33] block: Rename bdrv_inherited_options(), Max Reitz, 2020/02/18
- [PATCH v3 10/33] block: Use bdrv_inherited_options(), Max Reitz, 2020/02/18
- [PATCH v3 09/33] block: Add generic bdrv_inherited_options(), Max Reitz, 2020/02/18