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block: BdrvChildRole.attach/detach() callbacks

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Backing files are somewhat special compared to other kinds of children
because they are attached and detached using bdrv_set_backing_hd()
rather than the normal set of functions, which does a few more things
like setting backing blockers, toggling the BDRV_O_NO_BACKING flag,
setting parent_bs->backing_file, etc.

These special features are a reason why change_parent_backing_link()
can't handle backing files yet. With abstracting the additional features
into .attach/.detach callbacks, we get a step closer to a function that
can actually deal with this.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Acked-by: Fam Zheng <famz@redhat.com>
This commit is contained in:
Kevin Wolf 2017-02-08 11:28:52 +01:00
parent dd65a52e4a
commit db95dbba3b
2 changed files with 63 additions and 35 deletions
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3
include/block/block_int.h
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@ -472,6 +472,9 @@ struct BdrvChildRole {
*/
void (*drained_begin)(BdrvChild *child);
void (*drained_end)(BdrvChild *child);
void (*attach)(BdrvChild *child);
void (*detach)(BdrvChild *child);
};
extern const BdrvChildRole child_file;