staging/lustre/llite: Properly mark ll_obd_statfs argument as __user

Also update all callers.
This fixes a bunch of address space mismatch warnings from sparse.
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/llite/dir.c

@@ -1434,7 +1434,7 @@ static long ll_dir_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	case LL_IOC_LOV_SWAP_LAYOUTS:
 		return -EPERM;
 	case LL_IOC_OBD_STATFS:
-		return ll_obd_statfs(inode, (void *)arg);
+		return ll_obd_statfs(inode, (void __user *)arg);
 	case LL_IOC_LOV_GETSTRIPE:
 	case LL_IOC_MDC_GETINFO:
 	case IOC_MDC_GETFILEINFO:

drivers/staging/lustre/lustre/llite/file.c

@@ -2278,7 +2278,7 @@ ll_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	case LL_IOC_GROUP_UNLOCK:
 		return ll_put_grouplock(inode, file, arg);
 	case IOC_OBD_STATFS:
-		return ll_obd_statfs(inode, (void *)arg);
+		return ll_obd_statfs(inode, (void __user *)arg);
 
 	/* We need to special case any other ioctls we want to handle,
 	 * to send them to the MDS/OST as appropriate and to properly

drivers/staging/lustre/lustre/llite/llite_internal.h

@@ -782,7 +782,7 @@ int ll_show_options(struct seq_file *seq, struct dentry *dentry);
 void ll_dirty_page_discard_warn(struct page *page, int ioret);
 int ll_prep_inode(struct inode **inode, struct ptlrpc_request *req,
 		  struct super_block *, struct lookup_intent *);
-int ll_obd_statfs(struct inode *inode, void *arg);
+int ll_obd_statfs(struct inode *inode, void __user *arg);
 int ll_get_max_mdsize(struct ll_sb_info *sbi, int *max_mdsize);
 int ll_get_default_mdsize(struct ll_sb_info *sbi, int *default_mdsize);
 int ll_process_config(struct lustre_cfg *lcfg);

drivers/staging/lustre/lustre/llite/llite_lib.c

@@ -2019,7 +2019,7 @@ int ll_prep_inode(struct inode **inode, struct ptlrpc_request *req,
 	return rc;
 }
 
-int ll_obd_statfs(struct inode *inode, void *arg)
+int ll_obd_statfs(struct inode *inode, void __user *arg)
 {
 	struct ll_sb_info *sbi = NULL;
 	struct obd_export *exp;