libgocryptfs/internal/fusefrontend_reverse/rpath_cache.go
Jakob Unterwurzacher fe1705c55b reverse: add single-entry path cache
Speeds up the "ls -lR" benchmark from 2.6 seconds to 2.0.
2017-01-03 18:14:01 +01:00

42 lines
953 B
Go

package fusefrontend_reverse
import (
"sync"
)
// rPathCacheContainer is a simple one entry path cache. Because the dirIV
// is generated deterministically from the directory path, there is no need
// to ever invalidate entries.
type rPathCacheContainer struct {
sync.Mutex
// Relative ciphertext path to the directory
cPath string
// Relative plaintext path
pPath string
// Directory IV of the directory
dirIV []byte
}
func (c *rPathCacheContainer) lookup(cPath string) ([]byte, string) {
c.Lock()
defer c.Unlock()
if cPath == c.cPath {
//fmt.Printf("HIT %q\n", cPath)
return c.dirIV, c.pPath
}
//fmt.Printf("MISS %q\n", cPath)
return nil, ""
}
// store - write entry for "cPath" into the cache
func (c *rPathCacheContainer) store(cPath string, dirIV []byte, pPath string) {
//fmt.Printf("STORE %q\n", cPath)
c.Lock()
defer c.Unlock()
c.cPath = cPath
c.dirIV = dirIV
c.pPath = pPath
}
var rPathCache rPathCacheContainer