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raw-win32: Handle failure for potentially large allocations 

Some code in the block layer makes potentially huge allocations. Failure
is not completely unexpected there, so avoid aborting qemu and handle
out-of-memory situations gracefully.

This patch addresses the allocations in the raw-win32 block driver.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Kevin Wolf 2014-05-21 18:05:47 +02:00
parent 50d4a858e6
commit 4b6af3d58a
1 changed files with 5 additions and 1 deletions
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6
block/win32-aio.c
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@ -139,7 +139,10 @@ BlockDriverAIOCB *win32_aio_submit(BlockDriverState *bs,
waiocb->is_read = (type == QEMU_AIO_READ);
if (qiov->niov > 1) {
waiocb->buf = qemu_blockalign(bs, qiov->size);
waiocb->buf = qemu_try_blockalign(bs, qiov->size);
if (waiocb->buf == NULL) {
goto out;
}
if (type & QEMU_AIO_WRITE) {
iov_to_buf(qiov->iov, qiov->niov, 0, waiocb->buf, qiov->size);
}
@ -168,6 +171,7 @@ BlockDriverAIOCB *win32_aio_submit(BlockDriverState *bs,
out_dec_count:
aio->count--;
out:
qemu_aio_release(waiocb);
return NULL;
}