proposed fix for cryfs filesystem issue

nav.go

@@ -522,9 +522,16 @@ func (nav *nav) checkDir(dir *dir) {
 			return
 		}
 
+		// Cryfs filesystems always show as having 0 blocks and are always considered to be modified at current time
+		// See cryfs issue: https://github.com/cryfs/cryfs/issues/327
+		if getBlockCount(s) == 0 {
+			return
+		}
+
 		nav.startPreview()
 		dir.loading = true
 		dir.loadTime = now
+
 		go func() {
 			nd := newDir(dir.path)
 			nd.filter = dir.filter

os.go

@@ -222,6 +222,14 @@ func linkCount(f os.FileInfo) string {
 	return ""
 }
 
+func getBlockCount(f os.FileInfo) int64 {
+	sysCallStat, isSysCall := f.Sys().(*syscall.Stat_t)
+	if !isSysCall {
+		return -1
+	}
+	return sysCallStat.Blocks
+}
+
 func errCrossDevice(err error) bool {
 	return err.(*os.LinkError).Err.(unix.Errno) == unix.EXDEV
 }

os_windows.go

@@ -179,6 +179,10 @@ func linkCount(f os.FileInfo) string {
 	return ""
 }
 
+func getBlockCount(os.FileInfo) int64 {
+	return -1
+}
+
 func errCrossDevice(err error) bool {
 	return err.(*os.LinkError).Err.(windows.Errno) == 17
 }