NFS: Allow NFSROOT debugging messages to be enabled dynamically
As a convenience, introduce a kernel command line option to enable
NFSROOT debugging messages.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/nfsroot.c b/fs/nfs/nfsroot.c
index 8e7d623..460df36 100644
--- a/fs/nfs/nfsroot.c
+++ b/fs/nfs/nfsroot.c
@@ -67,6 +67,7 @@
* NFS over TCP.
* Fabian Frederick: Option parser rebuilt (using parser lib)
* Chuck Lever : Use super.c's text-based mount option parsing
+ * Chuck Lever : Add "nfsrootdebug".
*/
#include <linux/types.h>
@@ -80,8 +81,6 @@
#include "internal.h"
-/* Define this to allow debugging output */
-#undef NFSROOT_DEBUG
#define NFSDBG_FACILITY NFSDBG_ROOT
/* Default path we try to mount. "%s" gets replaced by our IP address */
@@ -103,6 +102,18 @@
static char nfs_root_device[NFS_MAXPATHLEN + 1] __initdata = "";
/*
+ * When the "nfsrootdebug" kernel command line option is specified,
+ * enable debugging messages for NFSROOT.
+ */
+static int __init nfs_root_debug(char *__unused)
+{
+ nfs_debug |= NFSDBG_ROOT | NFSDBG_MOUNT;
+ return 1;
+}
+
+__setup("nfsrootdebug", nfs_root_debug);
+
+/*
* Parse NFS server and directory information passed on the kernel
* command line.
*
@@ -282,10 +293,6 @@
*/
int __init nfs_root_data(char **root_device, char **root_data)
{
-#ifdef NFSROOT_DEBUG
- nfs_debug |= NFSDBG_ROOT | NFSDBG_MOUNT;
-#endif /* NFSROOT_DEBUG */
-
servaddr = root_server_addr;
if (servaddr == htonl(INADDR_NONE)) {
printk(KERN_ERR "Root-NFS: no NFS server address\n");