Re: [PATCH 2/2] samples/bpf: add a test for bpf_override_return

[Alexei Starovoitov]

On 10/30/17 2:19 PM, Josef Bacik wrote:

+
+rm -f testfile.img
+dd if=/dev/zero of=testfile.img bs=1M seek=1000 count=1
+DEVICE=$(losetup --show -f testfile.img)
+mkfs.btrfs -f $DEVICE
+mkdir tmpmnt
+./tracex7 $DEVICE
+if [ $? -eq 0 ]
+then
+       echo "SUCCESS!"
+else
+       echo "FAILED!"
+fi
+losetup -d $DEVICE

nice test!

diff --git a/samples/bpf/tracex7_kern.c b/samples/bpf/tracex7_kern.c
new file mode 100644
index 000000000000..a2f74f736e66
--- /dev/null
+++ b/samples/bpf/tracex7_kern.c
@@ -0,0 +1,15 @@
+#include <uapi/linux/ptrace.h>
+#include <uapi/linux/bpf.h>
+#include <linux/version.h>
+#include "bpf_helpers.h"
+
+SEC("kprobe/open_ctree")
+int bpf_prog1(struct pt_regs *ctx)
+{
+       unsigned long rc = -12;

pls add empty line here.

+       bpf_override_return(ctx, rc);
+       return 0;
+}