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Small fix to prefetch ranges aggregation
When after #16022 adding new range we aggregate more than two existing ranges, that should be very rare, only if several streams overlap, we may need to zero not the last range, but some earlier. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Closes #16072
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@ -418,8 +418,8 @@ dmu_zfetch_future(zstream_t *zs, uint64_t blkid, uint64_t nblks)
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zs->zs_ranges[f].start = zs->zs_ranges[l].start;
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zs->zs_ranges[f].end = zs->zs_ranges[l].end;
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}
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zs->zs_ranges[ZFETCH_RANGES - 1].start = 0;
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zs->zs_ranges[ZFETCH_RANGES - 1].end = 0;
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zs->zs_ranges[f].start = 0;
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zs->zs_ranges[f].end = 0;
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}
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} else if (i < ZFETCH_RANGES) {
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/* Got no intersecting ranges, insert new one. */
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