block: add BlockLimits.max_iov field
The maximum number of struct iovec elements depends on the BlockDriverState. The raw-posix and iSCSI protocols have a maximum of IOV_MAX but others could have different values. Cc: Peter Lieven <pl@kamp.de> Suggested-by: NKevin Wolf <kwolf@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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