pipe: move pipe_inode_info structure decleration up before it's used

There's really no reason it's below the first use of the pointer
type, and it'll fail compilation for the network addition (for good
reason). So move it up a bit.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

include/linux/pipe_fs_i.h

@@ -16,6 +16,21 @@ struct pipe_buffer {
 	unsigned int flags;
 };
 
+struct pipe_inode_info {
+	wait_queue_head_t wait;
+	unsigned int nrbufs, curbuf;
+	struct page *tmp_page;
+	unsigned int readers;
+	unsigned int writers;
+	unsigned int waiting_writers;
+	unsigned int r_counter;
+	unsigned int w_counter;
+	struct fasync_struct *fasync_readers;
+	struct fasync_struct *fasync_writers;
+	struct inode *inode;
+	struct pipe_buffer bufs[PIPE_BUFFERS];
+};
+
 /*
  * Note on the nesting of these functions:
  *
@@ -38,21 +53,6 @@ struct pipe_buf_operations {
 	void (*get)(struct pipe_inode_info *, struct pipe_buffer *);
 };
 
-struct pipe_inode_info {
-	wait_queue_head_t wait;
-	unsigned int nrbufs, curbuf;
-	struct page *tmp_page;
-	unsigned int readers;
-	unsigned int writers;
-	unsigned int waiting_writers;
-	unsigned int r_counter;
-	unsigned int w_counter;
-	struct fasync_struct *fasync_readers;
-	struct fasync_struct *fasync_writers;
-	struct inode *inode;
-	struct pipe_buffer bufs[PIPE_BUFFERS];
-};
-
 /* Differs from PIPE_BUF in that PIPE_SIZE is the length of the actual
    memory allocation, whereas PIPE_BUF makes atomicity guarantees.  */
 #define PIPE_SIZE		PAGE_SIZE