BKL-removal: Implement a compat_ioctl handler for JFS

The ioctls were already compatible except for the actual values so this
was fairly easy to do.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>

fs/jfs/file.c

@@ -113,4 +113,7 @@ const struct file_operations jfs_file_operations = {
 	.fsync		= jfs_fsync,
 	.release	= jfs_release,
 	.unlocked_ioctl = jfs_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl	= jfs_compat_ioctl,
+#endif
 };

fs/jfs/ioctl.c

@@ -117,3 +117,21 @@ long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 	}
 }
 
+#ifdef CONFIG_COMPAT
+long jfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+	/* While these ioctl numbers defined with 'long' and have different
+	 * numbers than the 64bit ABI,
+	 * the actual implementation only deals with ints and is compatible.
+	 */
+	switch (cmd) {
+	case JFS_IOC_GETFLAGS32:
+		cmd = JFS_IOC_GETFLAGS;
+		break;
+	case JFS_IOC_SETFLAGS32:
+		cmd = JFS_IOC_SETFLAGS;
+		break;
+	}
+	return jfs_ioctl(filp, cmd, arg);
+}
+#endif

fs/jfs/jfs_dinode.h

@@ -170,5 +170,7 @@ struct dinode {
 #define JFS_IOC_GETFLAGS	_IOR('f', 1, long)
 #define JFS_IOC_SETFLAGS	_IOW('f', 2, long)
 
+#define JFS_IOC_GETFLAGS32	_IOR('f', 1, int)
+#define JFS_IOC_SETFLAGS32	_IOW('f', 2, int)
 
 #endif /*_H_JFS_DINODE */

fs/jfs/jfs_inode.h

@@ -23,6 +23,7 @@ struct fid;
 extern struct inode *ialloc(struct inode *, umode_t);
 extern int jfs_fsync(struct file *, struct dentry *, int);
 extern long jfs_ioctl(struct file *, unsigned int, unsigned long);
+extern long jfs_compat_ioctl(struct file *, unsigned int, unsigned long);
 extern struct inode *jfs_iget(struct super_block *, unsigned long);
 extern int jfs_commit_inode(struct inode *, int);
 extern int jfs_write_inode(struct inode*, int);

fs/jfs/namei.c

@@ -1557,6 +1557,9 @@ const struct file_operations jfs_dir_operations = {
 	.readdir	= jfs_readdir,
 	.fsync		= jfs_fsync,
 	.unlocked_ioctl = jfs_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl	= jfs_compat_ioctl,
+#endif
 };
 
 static int jfs_ci_hash(struct dentry *dir, struct qstr *this)