diff options
| -rw-r--r-- | contrib/getdents/getdents.go | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/contrib/getdents/getdents.go b/contrib/getdents/getdents.go new file mode 100644 index 0000000..a70692a --- /dev/null +++ b/contrib/getdents/getdents.go @@ -0,0 +1,75 @@ +/* +Small tool to try to debug unix.Getdents problems on CIFS mounts +( https://github.com/rfjakob/gocryptfs/issues/483 ) + +Example output: + +$ while sleep 1 ; do ./getdents /mnt/synology/public/tmp/g1 ; done +unix.Getdents fd3: n=4176, err=<nil> +unix.Getdents fd3: n=4176, err=<nil> +unix.Getdents fd3: n=4176, err=<nil> +unix.Getdents fd3: n=4176, err=<nil> +unix.Getdents fd3: n=4176, err=<nil> +unix.Getdents fd3: n=3192, err=<nil> +unix.Getdents fd3: n=0, err=<nil> +total 24072 bytes +unix.Getdents fd3: n=4176, err=<nil> +unix.Getdents fd3: n=4176, err=<nil> +unix.Getdents fd3: n=4176, err=<nil> +unix.Getdents fd3: n=4176, err=<nil> +unix.Getdents fd3: n=-1, err=no such file or directory +total 16704 bytes +unix.Getdents fd3: n=4176, err=<nil> +unix.Getdents fd3: n=4176, err=<nil> +unix.Getdents fd3: n=4176, err=<nil> +unix.Getdents fd3: n=4176, err=<nil> +unix.Getdents fd3: n=4176, err=<nil> +unix.Getdents fd3: n=3192, err=<nil> +unix.Getdents fd3: n=0, err=<nil> +total 24072 bytes +*/ + +package main + +import ( + "flag" + "fmt" + "log" + "os" + + "golang.org/x/sys/unix" +) + +const ( + myName = "getdents" +) + +func main() { + flag.Usage = func() { + fmt.Fprintf(os.Stderr, "Usage: %s PATH\n", myName) + fmt.Fprintf(os.Stderr, "Run getdents(2) on PATH\n") + os.Exit(1) + } + flag.Parse() + if flag.NArg() != 1 { + flag.Usage() + } + path := flag.Arg(0) + + fd, err := unix.Open(path, unix.O_RDONLY, 0) + if err != nil { + log.Fatalf("unix.Open returned err=%v", err) + } + + tmp := make([]byte, 10000) + sum := 0 + for { + n, err := unix.Getdents(fd, tmp) + fmt.Printf("unix.Getdents fd%d: n=%d, err=%v\n", fd, n, err) + if n <= 0 { + fmt.Printf("total %d bytes\n", sum) + break + } + sum += n + } +} |