@@ -420,8 +421,13 @@
}
}
-#define _hashfn(dev,block) (((unsigned)(HASHDEV(dev)^block)) & bh_hash_mask)
-#define hash(dev,block) hash_table[_hashfn(dev,block)]
+/* After several hours of tedious analysis, the following hash
+ * function won. Do not mess with it... -DaveM
+ */
+#define _hashfn(dev,block) \
+ ((((dev)<<(bh_hash_shift - 6)) ^ ((dev)<<(bh_hash_shift - 9))) ^ \
+ (((block)<<(bh_hash_shift - 6)) ^ ((block) >> 13) ^ ((block) << (bh_hash_shift - 12))))
+#define hash(dev,block) hash_table[_hashfn(dev,block) & bh_hash_mask]
static inline void remove_from_hash_queue(struct buffer_head * bh)
{
As you mention "tedious analysis", would it be possible to see it?
Andrea
-
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