b=17167 libcfs: ensure all libcfs exported symbols to have cfs_ prefix

[fs/lustre-release.git] / libcfs / libcfs / linux / linux-debug.c

diff --git a/libcfs/libcfs/linux/linux-debug.c b/libcfs/libcfs/linux/linux-debug.c
index c25e659..367a3f0 100644 (file)
--- a/libcfs/libcfs/linux/linux-debug.c
+++ b/libcfs/libcfs/linux/linux-debug.c
@@ -77,7 +77,48 @@
 #include <linux/kallsyms.h>
 #endif
 
+/* We need to pass a pointer here, but elsewhere this must be a const */
+static char *debug_file_path = &libcfs_debug_file_path_arr[0];
+CFS_MODULE_PARM(debug_file_path, "s", charp, 0644,
+                "Path for dumping debug logs (deprecated)");
+
 char lnet_upcall[1024] = "/usr/lib/lustre/lnet_upcall";
+char lnet_debug_log_upcall[1024] = "/usr/lib/lustre/lnet_debug_log_upcall";
+
+/**
+ * Upcall function once a Lustre log has been dumped.
+ *
+ * \param file  path of the dumped log
+ */
+void libcfs_run_debug_log_upcall(char *file)
+{
+        char *argv[3];
+        int   rc;
+        char *envp[] = {
+                "HOME=/",
+                "PATH=/sbin:/bin:/usr/sbin:/usr/bin",
+                NULL};
+        ENTRY;
+
+        argv[0] = lnet_debug_log_upcall;
+
+        LASSERTF(file != NULL, "called on a null filename\n");
+        argv[1] = file; //only need to pass the path of the file
+
+        argv[2] = NULL;
+
+        rc = USERMODEHELPER(argv[0], argv, envp);
+        if (rc < 0 && rc != -ENOENT) {
+                CERROR("Error %d invoking LNET debug log upcall %s %s; "
+                       "check /proc/sys/lnet/debug_log_upcall\n",
+                       rc, argv[0], argv[1]);
+        } else {
+                CDEBUG(D_HA, "Invoked LNET debug log upcall %s %s\n",
+                       argv[0], argv[1]);
+        }
+
+        EXIT;
+}
 
 void libcfs_run_upcall(char **argv)
 {
@@ -115,7 +156,7 @@ void libcfs_run_upcall(char **argv)
         }
 }
 
-void libcfs_run_lbug_upcall(char *file, const char *fn, const int line)
+void libcfs_run_lbug_upcall(const char *file, const char *fn, const int line)
 {
         char *argv[6];
         char buf[32];
@@ -124,7 +165,7 @@ void libcfs_run_lbug_upcall(char *file, const char *fn, const int line)
         snprintf (buf, sizeof buf, "%d", line);
 
         argv[1] = "LBUG";
-        argv[2] = file;
+        argv[2] = (char *)file;
         argv[3] = (char *)fn;
         argv[4] = buf;
         argv[5] = NULL;
@@ -133,11 +174,12 @@ void libcfs_run_lbug_upcall(char *file, const char *fn, const int line)
 }
 
 #ifdef __arch_um__
-void lbug_with_loc(char *file, const char *func, const int line)
+void lbug_with_loc(const char *file, const char *func, const int line)
 {
         libcfs_catastrophe = 1;
         libcfs_debug_msg(NULL, 0, D_EMERG, file, func, line,
-                         "LBUG - trying to dump log to %s\n", debug_file_path);
+                         "LBUG - trying to dump log to %s\n",
+                         libcfs_debug_file_path);
         libcfs_debug_dumplog();
         libcfs_run_lbug_upcall(file, func, line);
         asm("int $3");
@@ -145,7 +187,7 @@ void lbug_with_loc(char *file, const char *func, const int line)
 }
 #else
 /* coverity[+kill] */
-void lbug_with_loc(char *file, const char *func, const int line)
+void lbug_with_loc(const char *file, const char *func, const int line)
 {
         libcfs_catastrophe = 1;
         libcfs_debug_msg(NULL, 0, D_EMERG, file, func, line, "LBUG\n");
@@ -156,7 +198,8 @@ void lbug_with_loc(char *file, const char *func, const int line)
         }
 
         libcfs_debug_dumpstack(NULL);
-        libcfs_debug_dumplog();
+        if (!libcfs_panic_on_lbug)
+                libcfs_debug_dumplog();
         libcfs_run_lbug_upcall(file, func, line);
         if (libcfs_panic_on_lbug)
                 panic("LBUG");
@@ -168,6 +211,54 @@ void lbug_with_loc(char *file, const char *func, const int line)
 
 #ifdef __KERNEL__
 
+#ifdef HAVE_DUMP_TRACE
+#include <linux/nmi.h>
+#include <asm/stacktrace.h>
+
+static void
+print_trace_warning_symbol(void *data, char *msg, unsigned long symbol)
+{
+        printk("%s", (char *)data);
+       print_symbol(msg, symbol);
+       printk("\n");
+}
+
+static void print_trace_warning(void *data, char *msg)
+{
+       printk("%s%s\n", (char *)data, msg);
+}
+
+static int print_trace_stack(void *data, char *name)
+{
+       printk(" <%s> ", name);
+       return 0;
+}
+
+#ifdef HAVE_TRACE_ADDRESS_RELIABLE
+# define RELIABLE reliable
+# define DUMP_TRACE_CONST const
+static void print_trace_address(void *data, unsigned long addr, int reliable)
+#else
+/* before 2.6.24 there was no reliable arg */
+# define RELIABLE 1
+# define DUMP_TRACE_CONST
+static void print_trace_address(void *data, unsigned long addr)
+#endif
+{
+        char fmt[32];
+       touch_nmi_watchdog();
+        sprintf(fmt, " [<%016lx>] %s%%s\n", addr, RELIABLE ? "": "? ");
+       __print_symbol(fmt, addr);
+}
+
+static DUMP_TRACE_CONST struct stacktrace_ops print_trace_ops = {
+       .warning = print_trace_warning,
+       .warning_symbol = print_trace_warning_symbol,
+       .stack = print_trace_stack,
+       .address = print_trace_address,
+};
+#endif
+
 void libcfs_debug_dumpstack(struct task_struct *tsk)
 {
 #if defined(__arch_um__)
@@ -175,6 +266,20 @@ void libcfs_debug_dumpstack(struct task_struct *tsk)
                 CWARN("stack dump for pid %d (%d) requested; wake up gdb.\n",
                       tsk->pid, UML_PID(tsk));
         //asm("int $3");
+#elif defined(HAVE_DUMP_TRACE)
+        /* dump_stack() */
+        /* show_trace() */
+        if (tsk == NULL)
+                tsk = current;
+       printk("Pid: %d, comm: %.20s\n", tsk->pid, tsk->comm);
+        /* show_trace_log_lvl() */
+       printk("\nCall Trace:\n");
+       dump_trace(tsk, NULL, NULL,
+#ifdef HAVE_TRACE_ADDRESS_RELIABLE
+                   0,
+#endif /* HAVE_TRACE_ADDRESS_RELIABLE */
+                   &print_trace_ops, NULL);
+       printk("\n");
 #elif defined(HAVE_SHOW_TASK)
         /* this is exported by lustre kernel version 42 */
         extern void show_task(struct task_struct *);
@@ -211,7 +316,7 @@ static int panic_notifier(struct notifier_block *self, unsigned long unused1,
          * console on the rare cases it is ever triggered. */
 
         if (in_interrupt()) {
-                trace_debug_print();
+                cfs_trace_debug_print();
         } else {
                 while (current->lock_depth >= 0)
                         unlock_kernel();