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block: Add bdrv_subtree_drained_begin/end()

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bdrv_drained_begin() waits for the completion of requests in the whole
subtree, but it only actually keeps its immediate bs parameter quiesced
until bdrv_drained_end().

Add a version that keeps the whole subtree drained. As of this commit,
graph changes cannot be allowed during a subtree drained section, but
this will be fixed soon.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2017-12-06 17:05:44 +01:00
parent 0152bf400f
commit b016558590
2 changed files with 56 additions and 11 deletions
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13
include/block/block.h
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@ -607,6 +607,14 @@ void bdrv_parent_drained_end(BlockDriverState *bs, BdrvChild *ignore);
*/
void bdrv_drained_begin(BlockDriverState *bs);
/**
* Like bdrv_drained_begin, but recursively begins a quiesced section for
* exclusive access to all child nodes as well.
*
* Graph changes are not allowed during a subtree drain section.
*/
void bdrv_subtree_drained_begin(BlockDriverState *bs);
/**
* bdrv_drained_end:
*
@ -614,6 +622,11 @@ void bdrv_drained_begin(BlockDriverState *bs);
*/
void bdrv_drained_end(BlockDriverState *bs);
/**
* End a quiescent section started by bdrv_subtree_drained_begin().
*/
void bdrv_subtree_drained_end(BlockDriverState *bs);
void bdrv_add_child(BlockDriverState *parent, BlockDriverState *child,
Error **errp);
void bdrv_del_child(BlockDriverState *parent, BdrvChild *child, Error **errp);