57188e2cac
[ Upstream commit 35b72573e977ed6b18b094136a4fa3e0ffb13603 ]
The current hash algorithm used for hashing cookie keys is really bad,
producing almost no dispersion (after a test kernel build, ~30000 files
were split over just 18 out of the 32768 hash buckets).
Borrow the full_name_hash() hash function into fscache to do the hashing
for cookie keys and, in the future, volume keys.
I don't want to use full_name_hash() as-is because I want the hash value to
be consistent across arches and over time as the hash value produced may
get used on disk.
I can also optimise parts of it away as the key will always be a padded
array of aligned 32-bit words.
Fixes:
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|---|---|---|
| .. | ||
| Kconfig | ||
| Makefile | ||
| cache.c | ||
| cookie.c | ||
| fsdef.c | ||
| histogram.c | ||
| internal.h | ||
| main.c | ||
| netfs.c | ||
| object-list.c | ||
| object.c | ||
| operation.c | ||
| page.c | ||
| proc.c | ||
| stats.c | ||