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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/nilfs2/bmap.c
..
..
@@ -67,20 +67,28 @@
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 	down_read(&bmap->b_sem);
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 	ret = bmap->b_ops->bop_lookup(bmap, key, level, ptrp);
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-	if (ret < 0) {
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-		ret = nilfs_bmap_convert_error(bmap, __func__, ret);
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+	if (ret < 0)
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 		goto out;
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-	}
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+
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 	if (NILFS_BMAP_USE_VBN(bmap)) {
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 		ret = nilfs_dat_translate(nilfs_bmap_get_dat(bmap), *ptrp,
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 					  &blocknr);
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 		if (!ret)
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 			*ptrp = blocknr;
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+		else if (ret == -ENOENT) {
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+			/*
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+			 * If there was no valid entry in DAT for the block
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+			 * address obtained by b_ops->bop_lookup, then pass
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+			 * internal code -EINVAL to nilfs_bmap_convert_error
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+			 * to treat it as metadata corruption.
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+			 */
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+			ret = -EINVAL;
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+		}
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 	}
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  out:
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 	up_read(&bmap->b_sem);
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-	return ret;
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+	return nilfs_bmap_convert_error(bmap, __func__, ret);
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 }
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 int nilfs_bmap_lookup_contig(struct nilfs_bmap *bmap, __u64 key, __u64 *ptrp,