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Revision e2a305fb

IDe2a305fb13ff0f5cf6ff805555aaa90a5ed5954c

Added by Christoph Hellwig over 11 years ago

block: avoid creating too large iovecs in multiwrite_merge

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.

Add a MAX_IOV defintion for platforms that don't have it. For now we use
the same 1024 define that's used on Linux and various other platforms,
but until the windows block backend implements some kind of vectored I/O
it doesn't matter.

Signed-off-by: Christoph Hellwig <>
Signed-off-by: Anthony Liguori <>

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