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From 1df02b6de7da262eb8349560f27f6c41d85953cd Mon Sep 17 00:00:00 2001
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From: John Snow <jsnow@redhat.com>
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Date: Mon, 6 May 2019 17:56:11 +0200
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Subject: [PATCH 01/53] qemu-img: Report bdrv_block_status failures
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RH-Author: John Snow <jsnow@redhat.com>
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Message-id: <20190506175629.11079-2-jsnow@redhat.com>
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Patchwork-id: 87181
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O-Subject: [RHEL-7.7 qemu-kvm-rhev PATCH 01/19] qemu-img: Report bdrv_block_status failures
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Bugzilla: 1692018
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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From: Eric Blake <eblake@redhat.com>
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If bdrv_block_status_above() fails, we are aborting the convert
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process but failing to print an error message. Broken in commit
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690c7301 (v2.4) when rewriting convert's logic.
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Discovered when teaching nbdkit to support NBD_CMD_BLOCK_STATUS, and
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accidentally violating the protocol by returning more than one extent
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in spite of qemu asking for NBD_CMD_FLAG_REQ_ONE. The qemu NBD code
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should probably handle the server's non-compliance more gracefully
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than failing with EINVAL, but qemu-img shouldn't be silently
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squelching any block status failures. It doesn't help that qemu 3.1
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masks the qemu-img bug with extra noise that the nbd code is dumping
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to stderr (that noise was cleaned up in d8b4bad8).
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Reported-by: Richard W.M. Jones <rjones@redhat.com>
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Signed-off-by: Eric Blake <eblake@redhat.com>
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Message-Id: <20190323212639.579-2-eblake@redhat.com>
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Reviewed-by: Kevin Wolf <kwolf@redhat.com>
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Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
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(cherry picked from commit 2058c2ad261de7f58fae01d63d3d0efa484caf2a)
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Signed-off-by: John Snow <jsnow@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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qemu-img.c | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/qemu-img.c b/qemu-img.c
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index 3b147ca..096e844 100644
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--- a/qemu-img.c
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+++ b/qemu-img.c
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@@ -1607,6 +1607,8 @@ static int convert_iteration_sectors(ImgConvertState *s, int64_t sector_num)
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count, &count, NULL, NULL);
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}
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if (ret < 0) {
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+ error_report("error while reading block status of sector %" PRId64
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+ ": %s", sector_num, strerror(-ret));
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return ret;
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}
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n = DIV_ROUND_UP(count, BDRV_SECTOR_SIZE);
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--
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1.8.3.1
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