block: prevent multiwrite_merge from creating too large iovecs
If we go over the maximum number of iovecs support by syscall we get back EINVAL from the kernel which translate to I/O errors for the guest. Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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