ext4: ext4_inode_info diet

Generic inode has unused i_private pointer which may be used as cur_aio_dio
storage.

TODO: If cur_aio_dio will be passed as an argument to get_block_t this allow
      to have concurent AIO_DIO requests.

Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 10 insertions, 2 deletions

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 8b6902c4d7be..3e8e185e5e22 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -912,8 +912,6 @@ struct ext4_inode_info {
         struct list_head i_completed_io_list;
         spinlock_t i_completed_io_lock;
         atomic_t i_ioend_count; /* Number of outstanding io_end structs */
-        /* current io_end structure for async DIO write*/
-        ext4_io_end_t *cur_aio_dio;
         atomic_t i_aiodio_unwritten; /* Nr. of inflight conversions pending */
 
         spinlock_t i_block_reservation_lock;
@@ -1338,6 +1336,16 @@ static inline void ext4_set_io_unwritten_flag(struct inode *inode,
         }
 }
 
+static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode)
+{
+        return inode->i_private;
+}
+
+static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io)
+{
+        inode->i_private = io;
+}
+
 /*
  * Inode dynamic state flags
  */