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block: Don't wait serialising for non-COR read requests

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The assertion problem was noticed in 06c3916b35, but it wasn't
completely fixed, because even though the req is not marked as
serialising, it still gets serialised by wait_serialising_requests
against other serialising requests, which could lead to the same
assertion failure.

Fix it by even more explicitly skipping the serialising for this
specific case.

Signed-off-by: Fam Zheng <famz@redhat.com>
Message-id: 1448962590-2842-2-git-send-email-famz@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Fam Zheng 2015-12-01 17:36:28 +08:00 • committed by Stefan Hajnoczi
parent d21e8776f6
commit 61408b250e
4 changed files with 11 additions and 9 deletions
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2
block/backup.c
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@ -132,7 +132,7 @@ static int coroutine_fn backup_do_cow(BlockDriverState *bs,
qemu_iovec_init_external(&bounce_qiov, &iov, 1);
if (is_write_notifier) {
ret = bdrv_co_no_copy_on_readv(bs,
ret = bdrv_co_readv_no_serialising(bs,
start * BACKUP_SECTORS_PER_CLUSTER,
n, &bounce_qiov);
} else {