@@ -1288,6 +1288,17 @@ void bdrv_format_default_perms(BlockDriverState *bs, BdrvChild *c,
bool bdrv_recurse_can_replace(BlockDriverState *bs,
BlockDriverState *to_replace);
+/*
+ * Default implementation for BlockDriver.bdrv_child_perm() that can
+ * be used by block filters and image formats, as long as they use the
+ * child_of_bds child class and set an appropriate BdrvChildRole.
+ */
+void bdrv_default_perms(BlockDriverState *bs, BdrvChild *c,
+ const BdrvChildClass *child_class, BdrvChildRole role,
+ BlockReopenQueue *reopen_queue,
+ uint64_t perm, uint64_t shared,
+ uint64_t *nperm, uint64_t *nshared);
+
/*
* Default implementation for drivers to pass bdrv_co_block_status() to
* their file.
@@ -2596,6 +2596,13 @@ void bdrv_format_default_perms(BlockDriverState *bs, BdrvChild *c,
uint64_t *nperm, uint64_t *nshared)
{
bool backing = (child_class == &child_backing);
+
+ if (child_class == &child_of_bds) {
+ bdrv_default_perms(bs, c, child_class, role, reopen_queue,
+ perm, shared, nperm, nshared);
+ return;
+ }
+
assert(child_class == &child_backing || child_class == &child_file);
if (!backing) {
@@ -2607,6 +2614,31 @@ void bdrv_format_default_perms(BlockDriverState *bs, BdrvChild *c,
}
}
+void bdrv_default_perms(BlockDriverState *bs, BdrvChild *c,
+ const BdrvChildClass *child_class, BdrvChildRole role,
+ BlockReopenQueue *reopen_queue,
+ uint64_t perm, uint64_t shared,
+ uint64_t *nperm, uint64_t *nshared)
+{
+ assert(child_class == &child_of_bds);
+
+ if (role & BDRV_CHILD_FILTERED) {
+ assert(!(role & (BDRV_CHILD_DATA | BDRV_CHILD_METADATA |
+ BDRV_CHILD_COW)));
+ bdrv_filter_default_perms(bs, c, child_class, role, reopen_queue,
+ perm, shared, nperm, nshared);
+ } else if (role & BDRV_CHILD_COW) {
+ assert(!(role & (BDRV_CHILD_DATA | BDRV_CHILD_METADATA)));
+ bdrv_default_perms_for_cow(bs, c, child_class, role, reopen_queue,
+ perm, shared, nperm, nshared);
+ } else if (role & (BDRV_CHILD_METADATA | BDRV_CHILD_DATA)) {
+ bdrv_default_perms_for_storage(bs, c, child_class, role, reopen_queue,
+ perm, shared, nperm, nshared);
+ } else {
+ g_assert_not_reached();
+ }
+}
+
uint64_t bdrv_qapi_perm_to_blk_perm(BlockPermission qapi_perm)
{
static const uint64_t permissions[] = {
This callback can be used by BDSs that use child_of_bds with the appropriate BdrvChildRole for their children. Also, make bdrv_format_default_perms() use it for child_of_bds children (just a temporary solution until we can drop bdrv_format_default_perms() altogether). Signed-off-by: Max Reitz <mreitz@redhat.com> --- include/block/block_int.h | 11 +++++++++++ block.c | 32 ++++++++++++++++++++++++++++++++ 2 files changed, 43 insertions(+)