hfsplus: Push down BKL into ioctl function

HFS is one of the remaining users of the ->ioctl function, convert it
blindly to unlocked_ioctl by pushing down the BKL.

Signed-off-by: Arnd Bergmann <[e-mail]>
Signed-off-by: Frederic Weisbecker <[e-mail]>

fs/hfsplus/dir.c

···
 const struct file_operations hfsplus_dir_operations = {
 	.read		= generic_read_dir,
 	.readdir	= hfsplus_readdir,
-	.ioctl          = hfsplus_ioctl,
+	.unlocked_ioctl = hfsplus_ioctl,
 	.llseek		= generic_file_llseek,
 	.release	= hfsplus_dir_release,
 };

fs/hfsplus/hfsplus_fs.h

···
 void hfsplus_delete_inode(struct inode *);
 
 /* ioctl.c */
-int hfsplus_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
-		  unsigned long arg);
+long hfsplus_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
 int hfsplus_setxattr(struct dentry *dentry, const char *name,
 		     const void *value, size_t size, int flags);
 ssize_t hfsplus_getxattr(struct dentry *dentry, const char *name,

fs/hfsplus/inode.c

···
 	.fsync		= file_fsync,
 	.open		= hfsplus_file_open,
 	.release	= hfsplus_file_release,
-	.ioctl          = hfsplus_ioctl,
+	.unlocked_ioctl = hfsplus_ioctl,
 };
 
 struct inode *hfsplus_new_inode(struct super_block *sb, int mode)

fs/hfsplus/ioctl.c

···
 #include <linux/mount.h>
 #include <linux/sched.h>
 #include <linux/xattr.h>
+#include <linux/smp_lock.h>
 #include <asm/uaccess.h>
 #include "hfsplus_fs.h"
 
-int hfsplus_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
-		  unsigned long arg)
+long hfsplus_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
+	struct inode *inode = filp->f_path.dentry->d_inode;
 	unsigned int flags;
 
+	lock_kernel();
 	switch (cmd) {
 	case HFSPLUS_IOC_EXT2_GETFLAGS:
 		flags = 0;
···
 	case HFSPLUS_IOC_EXT2_SETFLAGS: {
 		int err = 0;
 		err = mnt_want_write(filp->f_path.mnt);
-		if (err)
+		if (err) {
+			unlock_kernel();
 			return err;
+		}
 
 		if (!is_owner_or_cap(inode)) {
 			err = -EACCES;
···
 		mark_inode_dirty(inode);
 setflags_out:
 		mnt_drop_write(filp->f_path.mnt);
+		unlock_kernel();
 		return err;
 	}
 	default:
+		unlock_kernel();
 		return -ENOTTY;
 	}
 }