[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/fs/befs/io.c b/src/kernel/linux/v4.14/fs/befs/io.c
new file mode 100644
index 0000000..2caf50a
--- /dev/null
+++ b/src/kernel/linux/v4.14/fs/befs/io.c
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/fs/befs/io.c
+ *
+ * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com
+ *
+ * Based on portions of file.c and inode.c
+ * by Makoto Kato (m_kato@ga2.so-net.ne.jp)
+ *
+ * Many thanks to Dominic Giampaolo, author of Practical File System
+ * Design with the Be File System, for such a helpful book.
+ *
+ */
+
+#include <linux/buffer_head.h>
+
+#include "befs.h"
+#include "io.h"
+
+/*
+ * Converts befs notion of disk addr to a disk offset and uses
+ * linux kernel function sb_bread() to get the buffer containing
+ * the offset.
+ */
+
+struct buffer_head *
+befs_bread_iaddr(struct super_block *sb, befs_inode_addr iaddr)
+{
+ struct buffer_head *bh;
+ befs_blocknr_t block;
+ struct befs_sb_info *befs_sb = BEFS_SB(sb);
+
+ befs_debug(sb, "---> Enter %s "
+ "[%u, %hu, %hu]", __func__, iaddr.allocation_group,
+ iaddr.start, iaddr.len);
+
+ if (iaddr.allocation_group > befs_sb->num_ags) {
+ befs_error(sb, "BEFS: Invalid allocation group %u, max is %u",
+ iaddr.allocation_group, befs_sb->num_ags);
+ goto error;
+ }
+
+ block = iaddr2blockno(sb, &iaddr);
+
+ befs_debug(sb, "%s: offset = %lu", __func__, (unsigned long)block);
+
+ bh = sb_bread(sb, block);
+
+ if (bh == NULL) {
+ befs_error(sb, "Failed to read block %lu",
+ (unsigned long)block);
+ goto error;
+ }
+
+ befs_debug(sb, "<--- %s", __func__);
+ return bh;
+
+error:
+ befs_debug(sb, "<--- %s ERROR", __func__);
+ return NULL;
+}