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_vnodeops.c b/fs/xfs/xfs_vnodeops.c
index 51fc429..c2ff0fc 100644
--- a/fs/xfs/xfs_vnodeops.c
+++ b/fs/xfs/xfs_vnodeops.c
@@ -647,8 +647,6 @@
 	if (truncate) {
 		xfs_ilock(ip, XFS_IOLOCK_EXCL);
 
-		xfs_ioend_wait(ip);
-
 		error = xfs_trans_reserve(tp, 0,
 					  XFS_ITRUNCATE_LOG_RES(mp),
 					  0, XFS_TRANS_PERM_LOG_RES,
@@ -2076,7 +2074,7 @@
 	if (need_iolock) {
 		xfs_ilock(ip, XFS_IOLOCK_EXCL);
 		/* wait for the completion of any pending DIOs */
-		xfs_ioend_wait(ip);
+		inode_dio_wait(VFS_I(ip));
 	}
 
 	rounding = max_t(uint, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE);