9p: Use V9FS_MAGIC in statfs

Use V9FS_MAGIC as the file system type while filling kernel statfs
strucutre instead of using host file system magic number. Also move
the definition of V9FS_MAGIC from v9fs.h to standard magic.h file.
Signed-off-by: NM. Mohan Kumar <mohan@in.ibm.com>
Signed-off-by: NVenkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: NEric Van Hensbergen <ericvh@gmail.com>

fs/9p/v9fs.h

@@ -117,8 +117,6 @@ void v9fs_session_close(struct v9fs_session_info *v9ses);
 void v9fs_session_cancel(struct v9fs_session_info *v9ses);
 void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses);
 
-#define V9FS_MAGIC 0x01021997
-
 /* other default globals */
 #define V9FS_PORT	564
 #define V9FS_DEFUSER	"nobody"

fs/9p/vfs_super.c

@@ -39,6 +39,7 @@
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/statfs.h>
+#include <linux/magic.h>
 #include <net/9p/9p.h>
 #include <net/9p/client.h>
 
@@ -256,7 +257,7 @@ static int v9fs_statfs(struct dentry *dentry, struct kstatfs *buf)
 	if (v9fs_proto_dotl(v9ses)) {
 		res = p9_client_statfs(fid, &rs);
 		if (res == 0) {
-			buf->f_type = rs.type;
+			buf->f_type = V9FS_MAGIC;
 			buf->f_bsize = rs.bsize;
 			buf->f_blocks = rs.blocks;
 			buf->f_bfree = rs.bfree;

include/linux/magic.h

@@ -57,5 +57,6 @@
 
 #define DEVPTS_SUPER_MAGIC	0x1cd1
 #define SOCKFS_MAGIC		0x534F434B
+#define V9FS_MAGIC		0x01021997
 
 #endif /* __LINUX_MAGIC_H__ */