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block: Introduce bs->explicit_options

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bs->options doesn't only contain options that the user explicitly
requested, but also option that were derived from flags, the filename or
inherited from the parent node.

For reopen, it is important to know the difference because reopening the
parent can change inherited values in child nodes, but it shouldn't
change any options that were explicitly specified for the child.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Kevin Wolf 2015-05-08 16:15:03 +02:00
parent de3b53f007
commit 145f598e4a
3 changed files with 24 additions and 2 deletions
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include/block/block_int.h
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@ -459,6 +459,7 @@ struct BlockDriverState {
QLIST_HEAD(, BdrvChild) parents;
QDict *options;
QDict *explicit_options;
BlockdevDetectZeroesOptions detect_zeroes;
/* The error object in use for blocking operations on backing_hd */