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Commit d2da5e28 authored by Kevin Wolf's avatar Kevin Wolf
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mirror: Keep mirror_top_bs drained after dropping permissions



mirror_top_bs is currently implicitly drained through its connection to
the source or the target node. However, the drain section for target_bs
ends early after moving mirror_top_bs from src to target_bs, so that
requests can already be restarted while mirror_top_bs is still present
in the chain, but has dropped all permissions and therefore runs into an
assertion failure like this:

    qemu-system-x86_64: block/io.c:1634: bdrv_co_write_req_prepare:
    Assertion `child->perm & BLK_PERM_WRITE' failed.

Keep mirror_top_bs drained until all graph changes have completed.

Cc: qemu-stable@nongnu.org
Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
Reviewed-by: default avatarMax Reitz <mreitz@redhat.com>
parent 421919d7
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