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authorKevin Wolf <kwolf@redhat.com>2016-12-15 11:27:32 +0100
committerKevin Wolf <kwolf@redhat.com>2017-02-28 20:40:36 +0100
commit6a1b9ee152101868082dbf24ccb683af0431c85b (patch)
tree7065d40689b2a7048b3004ce512301f951725dbb /include
parent33a610c398603efafd954c706ba07850835a5098 (diff)
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block: Default .bdrv_child_perm() for filter drivers
Most filters need permissions related to read and write for their children, but only if the node has a parent that wants to use the same operation on the filter. The same is true for resize. This adds a default implementation that simply forwards all necessary permissions to all children of the node and leaves the other permissions unchanged. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Acked-by: Fam Zheng <famz@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com>
Diffstat (limited to 'include')
-rw-r--r--include/block/block_int.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/block/block_int.h b/include/block/block_int.h
index cef2b6e..17f4c2d 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -872,6 +872,14 @@ void bdrv_child_abort_perm_update(BdrvChild *c);
int bdrv_child_try_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared,
Error **errp);
+/* Default implementation for BlockDriver.bdrv_child_perm() that can be used by
+ * block filters: Forward CONSISTENT_READ, WRITE, WRITE_UNCHANGED and RESIZE to
+ * all children */
+void bdrv_filter_default_perms(BlockDriverState *bs, BdrvChild *c,
+ const BdrvChildRole *role,
+ uint64_t perm, uint64_t shared,
+ uint64_t *nperm, uint64_t *nshared);
+
const char *bdrv_get_parent_name(const BlockDriverState *bs);
void blk_dev_change_media_cb(BlockBackend *blk, bool load);