xfs: remove i_iocount

We now have an i_dio_count filed and surrounding infrastructure to wait
for direct I/O completion instead of i_icount, and we have never needed
to iocount waits for buffered I/O given that we only set the page uptodate
after finishing all required work.  Thus remove i_iocount, and replace
the actually needed waits with calls to inode_dio_wait.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Alex Elder <aelder@sgi.com>


diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index 32aca87..e041e91 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -840,9 +840,9 @@
 	}
 
 	/*
-	 * Wait for all I/O to complete.
+	 * Wait for all direct I/O to complete.
 	 */
-	xfs_ioend_wait(ip);
+	inode_dio_wait(inode);
 
 	error = -block_truncate_page(inode->i_mapping, iattr->ia_size,
 				     xfs_get_blocks);