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block: Add BlockBackendRootState

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This structure will store some of the state of the root BDS if the BDS
tree is removed, so that state can be restored once a new BDS tree is
inserted.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2015-10-19 17:53:24 +02:00 • committed by Kevin Wolf
parent 973f2ddf7b
commit 281d22d86c
4 changed files with 53 additions and 0 deletions
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10
include/block/block_int.h
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@ -26,6 +26,7 @@
#include "block/accounting.h"
#include "block/block.h"
#include "block/throttle-groups.h"
#include "qemu/option.h"
#include "qemu/queue.h"
#include "qemu/coroutine.h"
@ -449,6 +450,15 @@ struct BlockDriverState {
NotifierWithReturn write_threshold_notifier;
};
struct BlockBackendRootState {
int open_flags;
bool read_only;
BlockdevDetectZeroesOptions detect_zeroes;
char *throttle_group;
ThrottleState *throttle_state;
};
static inline BlockDriverState *backing_bs(BlockDriverState *bs)
{
return bs->backing ? bs->backing->bs : NULL;