Fixed MTP to work with TWRP

fs/efs/file.c

@@ -0,0 +1,56 @@
+/*
+ * file.c
+ *
+ * Copyright (c) 1999 Al Smith
+ *
+ * Portions derived from work (c) 1995,1996 Christian Vogelgsang.
+ */
+
+#include <linux/buffer_head.h>
+#include "efs.h"
+
+int efs_get_block(struct inode *inode, sector_t iblock,
+		  struct buffer_head *bh_result, int create)
+{
+	int error = -EROFS;
+	long phys;
+
+	if (create)
+		return error;
+	if (iblock >= inode->i_blocks) {
+#ifdef DEBUG
+		/*
+		 * i have no idea why this happens as often as it does
+		 */
+		pr_warn("%s(): block %d >= %ld (filesize %ld)\n",
+			__func__, block, inode->i_blocks, inode->i_size);
+#endif
+		return 0;
+	}
+	phys = efs_map_block(inode, iblock);
+	if (phys)
+		map_bh(bh_result, inode->i_sb, phys);
+	return 0;
+}
+
+int efs_bmap(struct inode *inode, efs_block_t block) {
+
+	if (block < 0) {
+		pr_warn("%s(): block < 0\n", __func__);
+		return 0;
+	}
+
+	/* are we about to read past the end of a file ? */
+	if (!(block < inode->i_blocks)) {
+#ifdef DEBUG
+		/*
+		 * i have no idea why this happens as often as it does
+		 */
+		pr_warn("%s(): block %d >= %ld (filesize %ld)\n",
+			__func__, block, inode->i_blocks, inode->i_size);
+#endif
+		return 0;
+	}
+
+	return efs_map_block(inode, block);
+}