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authorJakob Unterwurzacher2020-05-24 22:54:21 +0200
committerJakob Unterwurzacher2020-05-24 22:54:58 +0200
commitc7a9425e1b153b53bb1b6af6d6aabba6dea0b2c6 (patch)
tree2409a9bc738b95fa30b47ac0f8e0dfe3d42be6b4
parent1a91a11e00546894325f3380488e2ad26bb5d27e (diff)
Add contrib/getdents
Small tool to try to debug unix.Getdents problems on CIFS mounts https://github.com/rfjakob/gocryptfs/issues/483
-rw-r--r--contrib/getdents/getdents.go75
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
+ }
+}