As a convenience, introduce a kernel command line option to enable
NFSROOT debugging messages.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
Documentation/filesystems/nfs/nfsroot.txt | 22 ++++++++++++++++++++++
Documentation/kernel-parameters.txt | 5 ++++-
fs/nfs/nfsroot.c | 19 +++++++++++++------
3 files changed, 39 insertions(+), 7 deletions(-)
diff --git a/Documentation/filesystems/nfs/nfsroot.txt b/Documentation/filesystems/nfs/nfsroot.txt
index f2430a7..90c71c6 100644
--- a/Documentation/filesystems/nfs/nfsroot.txt
+++ b/Documentation/filesystems/nfs/nfsroot.txt
@@ -159,6 +159,28 @@ ip=<client-ip>:<server-ip>:<gw-ip>:<netmask>:<hostname>:<device>:<autoconf>
Default: any
+nfsrootdebug
+
+ This parameter enables debugging messages to appear in the kernel
+ log at boot time so that administrators can verify that the correct
+ NFS mount options, server address, and root path are passed to the
+ NFS client.
+
+
+rdinit=<executable file>
+
+ To specify which file contains the program that starts system
+ initialization, administrators can use this command line parameter.
+ The default value of this parameter is "/init". If the specified
+ file exists and the kernel can execute it, root filesystem related
+ kernel command line parameters, including `nfsroot=', are ignored.
+
+ A description of the process of mounting the root file system can be
+ found in:
+
+ Documentation/early-userspace/README
+
+
3.) Boot Loader
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index f084af0..0fe70b2 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1532,12 +1532,15 @@ and is between 256 and 4096 characters. It is defined in the file
1 to enable accounting
Default value is 0.
- nfsaddrs= [NFS]
+ nfsaddrs= [NFS] Deprecated. Use ip= instead.
See Documentation/filesystems/nfs/nfsroot.txt.
nfsroot= [NFS] nfs root filesystem for disk-less boxes.
See Documentation/filesystems/nfs/nfsroot.txt.
+ nfsrootdebug [NFS] enable nfsroot debugging messages.
+ See Documentation/filesystems/nfs/nfsroot.txt.
+
nfs.callback_tcpport=
[NFS] set the TCP port on which the NFSv4 callback
channel should listen.
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_export_path[NFS_MAXPATHLEN + 1] __initdata = "";
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 @@ out_devnametoolong:
*/
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");
--
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