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__le32 dn_maxag; /* 4: max active alloc group number */
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__le32 dn_agpref; /* 4: preferred alloc group (hint) */
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__le32 dn_aglevel; /* 4: dmapctl level holding the AG */
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__le32 dn_agwidth; /* 4: width in dmapctl of the AG */
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__le32 dn_agstart; /* 4: start tree index at AG height */
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__le32 dn_agl2size; /* 4: l2 num of blks per alloc group */