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block: another bdrv_append fix

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bdrv_append must also copy open_flags to the top, because the snapshot
has BDRV_O_NO_BACKING set.  This causes interesting results if you
later use drive-reopen (not upstream) to reopen the image, and lose
the backing file in the process.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2012-05-08 16:51:42 +02:00 committed by Kevin Wolf
parent e023b2e244
commit 3a389e7926
1 changed files with 1 additions and 0 deletions
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block.c
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@ -977,6 +977,7 @@ void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top)
tmp = *bs_new;
/* there are some fields that need to stay on the top layer: */
tmp.open_flags = bs_top->open_flags;
/* dev info */
tmp.dev_ops = bs_top->dev_ops;