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authorJakob Unterwurzacher2020-05-24 23:46:41 +0200
committerJakob Unterwurzacher2020-05-24 23:46:41 +0200
commit6019598fdb9d223beec7da5848cf950ca90e85e7 (patch)
treebf2a6ee2241b4dd1b5331d0514cafd455d9a1b4a /contrib/getdents-debug
parent71c0481f0e42c6bf1749dde8a30d9a6b728e83a0 (diff)
contrib: collect getdents stuff in getdents-debug folder
Diffstat (limited to 'contrib/getdents-debug')
-rw-r--r--contrib/getdents-debug/getdents/.gitignore1
-rw-r--r--contrib/getdents-debug/getdents/getdents.go75
-rw-r--r--contrib/getdents-debug/getdents_c/.gitignore1
-rw-r--r--contrib/getdents-debug/getdents_c/Makefile2
-rw-r--r--contrib/getdents-debug/getdents_c/getdents.c39
5 files changed, 118 insertions, 0 deletions
diff --git a/contrib/getdents-debug/getdents/.gitignore b/contrib/getdents-debug/getdents/.gitignore
new file mode 100644
index 0000000..6dae481
--- /dev/null
+++ b/contrib/getdents-debug/getdents/.gitignore
@@ -0,0 +1 @@
+/getdents
diff --git a/contrib/getdents-debug/getdents/getdents.go b/contrib/getdents-debug/getdents/getdents.go
new file mode 100644
index 0000000..a70692a
--- /dev/null
+++ b/contrib/getdents-debug/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
+ }
+}
diff --git a/contrib/getdents-debug/getdents_c/.gitignore b/contrib/getdents-debug/getdents_c/.gitignore
new file mode 100644
index 0000000..2f94993
--- /dev/null
+++ b/contrib/getdents-debug/getdents_c/.gitignore
@@ -0,0 +1 @@
+/getdents_c
diff --git a/contrib/getdents-debug/getdents_c/Makefile b/contrib/getdents-debug/getdents_c/Makefile
new file mode 100644
index 0000000..95e47dc
--- /dev/null
+++ b/contrib/getdents-debug/getdents_c/Makefile
@@ -0,0 +1,2 @@
+getdents_c: *.c Makefile
+ gcc getdents.c -o getdents_c
diff --git a/contrib/getdents-debug/getdents_c/getdents.c b/contrib/getdents-debug/getdents_c/getdents.c
new file mode 100644
index 0000000..98c2346
--- /dev/null
+++ b/contrib/getdents-debug/getdents_c/getdents.c
@@ -0,0 +1,39 @@
+// See ../getdents/getdents.go for some info on why
+// this exists.
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <sys/stat.h>
+#include <sys/syscall.h>
+#include <errno.h>
+
+int main(int argc, char *argv[])
+{
+ if(argc < 2) {
+ printf("Usage: %s PATH\n", argv[0]);
+ printf("Run getdents(2) on PATH\n");
+ exit(1);
+ }
+
+ const char *path = argv[1];
+ int fd = open(path, O_RDONLY);
+ if (fd == -1) {
+ perror("open");
+ exit(1);
+ }
+
+ char tmp[10000];
+ int sum = 0;
+ for ( ; ; ) {
+ int n = syscall(SYS_getdents64, fd, tmp, sizeof(tmp));
+ printf("getdents64 fd%d: n=%d, errno=%d\n", fd, n, errno);
+ if (n <= 0) {
+ printf("total %d bytes\n", sum);
+ break;
+ }
+ sum += n;
+ }
+}