udf: add extent cache support in case of file reading

[platform/adaptation/renesas_rcar/renesas_kernel.git] / fs / udf / udf_i.h

diff --git a/fs/udf/udf_i.h b/fs/udf/udf_i.h
index bb8309d..b5cd8ed 100644 (file)
--- a/fs/udf/udf_i.h
+++ b/fs/udf/udf_i.h
@@ -1,6 +1,19 @@
 #ifndef _UDF_I_H
 #define _UDF_I_H
 
+struct extent_position {
+       struct buffer_head *bh;
+       uint32_t offset;
+       struct kernel_lb_addr block;
+};
+
+struct udf_ext_cache {
+       /* Extent position */
+       struct extent_position epos;
+       /* Start logical offset in bytes */
+       loff_t lstart;
+};
+
 /*
  * The i_data_sem and i_mutex serve for protection of allocation information
  * of a regular files and symlinks. This includes all extents belonging to
@@ -35,6 +48,9 @@ struct udf_inode_info {
                __u8            *i_data;
        } i_ext;
        struct rw_semaphore     i_data_sem;
+       struct udf_ext_cache cached_extent;
+       /* Spinlock for protecting extent cache */
+       spinlock_t i_extent_cache_lock;
        struct inode vfs_inode;
 };