update man pages to forbid running on live metadata
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@@ -24,13 +24,15 @@ in order to put it back onto a metadata
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(to process by the device-mapper target) or
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.I file.
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This tool cannot be run on live metadata unless the \fB\-\-metadata\-snap\fP option is used.
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.IP "\fB\-f, \-\-format\fP \fI{xml|human_readable}\fP".
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Print output in XML or human readable format.
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.IP "\fB\-r, \-\-repair\fP".
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Repair the metadata whilst dumping it.
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.IP "\fB\-m, \-\-metadata_snap\fP [block#]".
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.IP "\fB\-m, \-\-metadata\-snap\fP [block#]".
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Dump metadata snapshot created by device-mapper thin provisioning target.
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If block is not provided, access the default metadata snapshot created by
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the thin provisioning device-mapper target, else try the one at block#.
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