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block: Improve error message when external snapshot can't flush

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external_snapshot_action() reports bdrv_flush() failure to its caller
as

    An IO error has occurred

The errno code returned by bdrv_flush() is lost.

Improve this to

    Write to node '<device or node name>' failed: <description of errno>

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20240513141703.549874-2-armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
This commit is contained in:
Markus Armbruster 2024-05-13 16:16:58 +02:00
parent 60b54b67c6
commit 540d91b40c
1 changed files with 4 additions and 2 deletions
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6
blockdev.c
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@ -1406,8 +1406,10 @@ static void external_snapshot_action(TransactionAction *action,
}
if (!bdrv_is_read_only(state->old_bs)) {
if (bdrv_flush(state->old_bs)) {
error_setg(errp, QERR_IO_ERROR);
ret = bdrv_flush(state->old_bs);
if (ret < 0) {
error_setg_errno(errp, -ret, "Write to node '%s' failed",
bdrv_get_device_or_node_name(state->old_bs));
return;
}
}