smbfs: Push down BKL into ioctl function

Converting from ->ioctl to ->unlocked_ioctl with explicit
lock_kernel lets us kill the ioctl operation.

Signed-off-by: Arnd Bergmann <[e-mail]>
[fixed inode reference in smb_ioctl]
Signed-off-by: Frederic Weisbecker <[e-mail]>

fs/smbfs/dir.c

···
 {
 	.read		= generic_read_dir,
 	.readdir	= smb_readdir,
-	.ioctl		= smb_ioctl,
+	.unlocked_ioctl	= smb_ioctl,
 	.open		= smb_dir_open,
 };
 

fs/smbfs/file.c

···
 	.aio_read	= smb_file_aio_read,
 	.write		= do_sync_write,
 	.aio_write	= smb_file_aio_write,
-	.ioctl		= smb_ioctl,
+	.unlocked_ioctl	= smb_ioctl,
 	.mmap		= smb_file_mmap,
 	.open		= smb_file_open,
 	.release	= smb_file_release,

fs/smbfs/ioctl.c

···
 #include <linux/time.h>
 #include <linux/mm.h>
 #include <linux/highuid.h>
+#include <linux/smp_lock.h>
 #include <linux/net.h>
 
 #include <linux/smb_fs.h>
···
 
 #include "proto.h"
 
-int
-smb_ioctl(struct inode *inode, struct file *filp,
-	  unsigned int cmd, unsigned long arg)
+long
+smb_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
-	struct smb_sb_info *server = server_from_inode(inode);
+	struct smb_sb_info *server = server_from_inode(filp->f_path.dentry->d_inode);
 	struct smb_conn_opt opt;
 	int result = -EINVAL;
 
+	lock_kernel();
 	switch (cmd) {
 		uid16_t uid16;
 		uid_t uid32;
···
 	default:
 		break;
 	}
+	unlock_kernel();
 
 	return result;
 }

fs/smbfs/proto.h

···
 extern const struct file_operations smb_file_operations;
 extern const struct inode_operations smb_file_inode_operations;
 /* ioctl.c */
-extern int smb_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg);
+extern long smb_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
 /* smbiod.c */
 extern void smbiod_wake_up(void);
 extern int smbiod_register_server(struct smb_sb_info *server);