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block: Improve error message when external snapshot can't flush
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>
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@ -1406,8 +1406,10 @@ static void external_snapshot_action(TransactionAction *action,
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}
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if (!bdrv_is_read_only(state->old_bs)) {
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if (bdrv_flush(state->old_bs)) {
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error_setg(errp, QERR_IO_ERROR);
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ret = bdrv_flush(state->old_bs);
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if (ret < 0) {
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error_setg_errno(errp, -ret, "Write to node '%s' failed",
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bdrv_get_device_or_node_name(state->old_bs));
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return;
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}
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}
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