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qcow2: Fix error handling for immediate backing file read failure 

Requests could return success even though they failed when bdrv_aio_readv
returned NULL for a backing file read.

Reported-by: Chunqiang Tang <ctang@us.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2011-02-08 18:12:35 +01:00
parent e0d9c6f937
commit 3ab4c7e92d
1 changed files with 3 additions and 1 deletions
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4
block/qcow2.c
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@ -479,8 +479,10 @@ static void qcow2_aio_read_cb(void *opaque, int ret)
BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO); BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO);
acb->hd_aiocb = bdrv_aio_readv(bs->backing_hd, acb->sector_num, acb->hd_aiocb = bdrv_aio_readv(bs->backing_hd, acb->sector_num,
&acb->hd_qiov, n1, qcow2_aio_read_cb, acb); &acb->hd_qiov, n1, qcow2_aio_read_cb, acb);
if (acb->hd_aiocb == NULL) if (acb->hd_aiocb == NULL) {
ret = -EIO;
goto done; goto done;
}
} else { } else {
ret = qcow2_schedule_bh(qcow2_aio_read_bh, acb); ret = qcow2_schedule_bh(qcow2_aio_read_bh, acb);
if (ret < 0) if (ret < 0)