SUNRPC/NFS: Add Kbuild dependencies for NFS_DEBUG/RPC_DEBUG
This allows us to turn on/off the dprintk() debugging interfaces for
those distributions that don't ship the 'rpcdebug' utility.
It also allows us to add Kbuild dependencies. Specifically, we already
know that dprintk() in general relies on CONFIG_SYSCTL. Now it turns out
that the NFS dprintks depend on CONFIG_CRC32 after we added support
for the filehandle hash.
Reported-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig
index 7bce64c..2a0e6c5 100644
--- a/fs/nfs/Kconfig
+++ b/fs/nfs/Kconfig
@@ -144,3 +144,9 @@
depends on NFS_V4 && !NFS_USE_LEGACY_DNS
select DNS_RESOLVER
default y
+
+config NFS_DEBUG
+ bool
+ depends on NFS_FS && SUNRPC_DEBUG
+ select CRC32
+ default y
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 1a19f8d..7bb4d13 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -1047,7 +1047,7 @@
return fh;
}
-#ifdef RPC_DEBUG
+#ifdef NFS_DEBUG
/*
* _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
* in the same way that wireshark does
diff --git a/fs/nfs/mount_clnt.c b/fs/nfs/mount_clnt.c
index b37ca34..8e65c7f 100644
--- a/fs/nfs/mount_clnt.c
+++ b/fs/nfs/mount_clnt.c
@@ -16,7 +16,7 @@
#include <linux/nfs_fs.h>
#include "internal.h"
-#ifdef RPC_DEBUG
+#ifdef NFS_DEBUG
# define NFSDBG_FACILITY NFSDBG_MOUNT
#endif
diff --git a/fs/nfs/nfsroot.c b/fs/nfs/nfsroot.c
index c4744e1..cd3c910 100644
--- a/fs/nfs/nfsroot.c
+++ b/fs/nfs/nfsroot.c
@@ -104,7 +104,7 @@
/* server:export path string passed to super.c */
static char nfs_root_device[NFS_MAXPATHLEN + 1] __initdata = "";
-#ifdef RPC_DEBUG
+#ifdef NFS_DEBUG
/*
* When the "nfsrootdebug" kernel command line option is specified,
* enable debugging messages for NFSROOT.
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index 0a63ab2..8f27c2e 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -38,6 +38,13 @@
#ifdef __KERNEL__
+/*
+ * Enable dprintk() debugging support for nfs client.
+ */
+#ifdef CONFIG_NFS_DEBUG
+# define NFS_DEBUG
+#endif
+
#include <linux/in.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
@@ -391,7 +398,7 @@
kfree(fh);
}
-#ifdef RPC_DEBUG
+#ifdef NFS_DEBUG
extern u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh);
static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
{
@@ -650,14 +657,6 @@
#ifdef __KERNEL__
-/*
- * Enable debugging support for nfs client.
- * Requires RPC_DEBUG.
- */
-#ifdef RPC_DEBUG
-# define NFS_DEBUG
-#endif
-
# undef ifdebug
# ifdef NFS_DEBUG
# define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
diff --git a/include/linux/sunrpc/debug.h b/include/linux/sunrpc/debug.h
index 6cb2517..9448eb5e 100644
--- a/include/linux/sunrpc/debug.h
+++ b/include/linux/sunrpc/debug.h
@@ -31,7 +31,7 @@
/*
* Enable RPC debugging/profiling.
*/
-#ifdef CONFIG_SYSCTL
+#ifdef CONFIG_SUNRPC_DEBUG
#define RPC_DEBUG
#endif
#ifdef CONFIG_TRACEPOINTS
diff --git a/net/sunrpc/Kconfig b/net/sunrpc/Kconfig
index ffd243d..9fe8857 100644
--- a/net/sunrpc/Kconfig
+++ b/net/sunrpc/Kconfig
@@ -39,3 +39,16 @@
Kerberos support should be installed.
If unsure, say Y.
+
+config SUNRPC_DEBUG
+ bool "RPC: Enable dprintk debugging"
+ depends on SUNRPC && SYSCTL
+ help
+ This option enables a sysctl-based debugging interface
+ that is be used by the 'rpcdebug' utility to turn on or off
+ logging of different aspects of the kernel RPC activity.
+
+ Disabling this option will make your kernel slightly smaller,
+ but makes troubleshooting NFS issues significantly harder.
+
+ If unsure, say Y.