perf trace: Use the augmented filename, expanding syscall enter pointers

[linux-2.6-microblaze.git] / tools / perf / examples / bpf / augmented_syscalls.c

diff --git a/tools/perf/examples/bpf/augmented_syscalls.c b/tools/perf/examples/bpf/augmented_syscalls.c
index 10e7997..93960e8 100644 (file)
--- a/tools/perf/examples/bpf/augmented_syscalls.c
+++ b/tools/perf/examples/bpf/augmented_syscalls.c
@@ -27,6 +27,12 @@ struct bpf_map SEC("maps") __augmented_syscalls__ = {
        .max_entries = __NR_CPUS__,
 };
 
+struct augmented_filename {
+       int     size;
+       int     reserved;
+       char    value[256];
+};
+
 struct syscall_enter_openat_args {
        unsigned long long common_tp_fields;
        long               syscall_nr;
@@ -38,17 +44,20 @@ struct syscall_enter_openat_args {
 
 struct augmented_enter_openat_args {
        struct syscall_enter_openat_args args;
-       char                             filename[64];
+       struct augmented_filename        filename;
 };
 
 int syscall_enter(openat)(struct syscall_enter_openat_args *args)
 {
-       struct augmented_enter_openat_args augmented_args;
+       struct augmented_enter_openat_args augmented_args = { .filename.reserved = 0, };
 
        probe_read(&augmented_args.args, sizeof(augmented_args.args), args);
-       probe_read_str(&augmented_args.filename, sizeof(augmented_args.filename), args->filename_ptr);
+       augmented_args.filename.size = probe_read_str(&augmented_args.filename.value,
+                                                     sizeof(augmented_args.filename.value),
+                                                     args->filename_ptr);
        perf_event_output(args, &__augmented_syscalls__, BPF_F_CURRENT_CPU,
-                         &augmented_args, sizeof(augmented_args));
+                         &augmented_args,
+                         sizeof(augmented_args) - sizeof(augmented_args.filename.value) + augmented_args.filename.size);
        return 0;
 }