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block: copy enable_write_cache in bdrv_append

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Because the guest will be able to flip enable_write_cache, the actual
state may not match what is used to open the new snapshot.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2012-06-06 00:04:51 +02:00 committed by Kevin Wolf
parent ad492c9244
commit c4a248a138
1 changed files with 2 additions and 0 deletions
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2
block.c
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@ -1000,6 +1000,8 @@ void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top)
tmp.buffer_alignment = bs_top->buffer_alignment; tmp.buffer_alignment = bs_top->buffer_alignment;
tmp.copy_on_read = bs_top->copy_on_read; tmp.copy_on_read = bs_top->copy_on_read;
tmp.enable_write_cache = bs_top->enable_write_cache;
/* i/o timing parameters */ /* i/o timing parameters */
tmp.slice_time = bs_top->slice_time; tmp.slice_time = bs_top->slice_time;
tmp.slice_start = bs_top->slice_start; tmp.slice_start = bs_top->slice_start;