zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/fs/xfs/xfs_rw.h b/ap/os/linux/linux-3.4.x/fs/xfs/xfs_rw.h
new file mode 100644
index 0000000..bbdb9ad
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/xfs/xfs_rw.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2000-2006 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#ifndef __XFS_RW_H__
+#define __XFS_RW_H__
+
+struct xfs_buf;
+struct xfs_inode;
+struct xfs_mount;
+
+/*
+ * Convert the given file system block to a disk block.
+ * We have to treat it differently based on whether the
+ * file is a real time file or not, because the bmap code
+ * does.
+ */
+static inline xfs_daddr_t
+xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb)
+{
+ return (XFS_IS_REALTIME_INODE(ip) ? \
+ (xfs_daddr_t)XFS_FSB_TO_BB((ip)->i_mount, (fsb)) : \
+ XFS_FSB_TO_DADDR((ip)->i_mount, (fsb)));
+}
+
+/*
+ * Prototypes for functions in xfs_rw.c.
+ */
+extern int xfs_read_buf(struct xfs_mount *mp, xfs_buftarg_t *btp,
+ xfs_daddr_t blkno, int len, uint flags,
+ struct xfs_buf **bpp);
+extern xfs_extlen_t xfs_get_extsz_hint(struct xfs_inode *ip);
+
+#endif /* __XFS_RW_H__ */