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block: prevent multiwrite_merge from creating too large iovecs

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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: Christoph Hellwig <hch@lst.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Christoph Hellwig 2010-01-19 22:15:39 +01:00 committed by Anthony Liguori
parent 1d44952fc7
commit 0076bc0c1d
1 changed files with 4 additions and 0 deletions
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4
block.c
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@ -1689,6 +1689,10 @@ static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs,
merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]);
}
if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) {
merge = 0;
}
if (merge) {
size_t size;
QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov));