Klaus Post e65ed2e44f
listcache: Add path index (#11063)
Add a root path index.

```
Before:
Benchmark_bucketMetacache_findCache-32    	   10000	    730737 ns/op

With excluded prints:
Benchmark_bucketMetacache_findCache-32    	   10000	    207100 ns/op

With the root path:
Benchmark_bucketMetacache_findCache-32    	  705765	      1943 ns/op
```

Benchmark used (not linear):

```Go
func Benchmark_bucketMetacache_findCache(b *testing.B) {
	bm := newBucketMetacache("", false)
	for i := 0; i < b.N; i++ {
		bm.findCache(listPathOptions{
			ID:           mustGetUUID(),
			Bucket:       "",
			BaseDir:      "prefix/" + mustGetUUID(),
			Prefix:       "",
			FilterPrefix: "",
			Marker:       "",
			Limit:        0,
			AskDisks:     0,
			Recursive:    false,
			Separator:    slashSeparator,
			Create:       true,
			CurrentCycle: 0,
			OldestCycle:  0,
		})
	}
}
```

Replaces #11058
2020-12-09 08:37:43 -08:00
..
2020-06-12 20:04:01 -07:00
2020-12-01 13:50:33 -08:00
2020-01-31 08:29:22 +05:30
2020-12-01 13:50:33 -08:00