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We'd like to pass in mda_header to vgname_from_mda(). In order to do this, we need to call raw_read_mda_header() from text_label.c, _text_read(), which gets called from the label_read() path, and peers into the metadata and update vginfo cache. We should check the disable bit here, and if set, not peer into the vg metadata, thus reducing the I/O to disk. In the process, move vgname_from_mda() to layout.h, since the fn only gets called from format_text code, and we need the mda_header definition from the private layout.h. Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
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