xfs: remove IO_ISAIO

We set the IO_ISAIO flag for all read/write I/O since early Linux
2.6.x.  Remove it as it has lost it's purpose long ago.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <david@fromorbit.com>
Reviewed-by: Eric Sandeen <sandeen@sandeen.net>
Signed-off-by: Alex Elder <aelder@sgi.com>

fs/xfs/linux-2.6/xfs_file.c

@@ -52,7 +52,7 @@ xfs_file_aio_read(
 	loff_t			pos)
 {
 	struct file		*file = iocb->ki_filp;
-	int			ioflags = IO_ISAIO;
+	int			ioflags = 0;
 
 	BUG_ON(iocb->ki_pos != pos);
 	if (unlikely(file->f_flags & O_DIRECT))
@@ -71,7 +71,7 @@ xfs_file_aio_write(
 	loff_t			pos)
 {
 	struct file		*file = iocb->ki_filp;
-	int			ioflags = IO_ISAIO;
+	int			ioflags = 0;
 
 	BUG_ON(iocb->ki_pos != pos);
 	if (unlikely(file->f_flags & O_DIRECT))

fs/xfs/linux-2.6/xfs_lrw.c

@@ -255,8 +255,6 @@ xfs_read(
 
 	iocb->ki_pos = *offset;
 	ret = generic_file_aio_read(iocb, iovp, segs, *offset);
-	if (ret == -EIOCBQUEUED && !(ioflags & IO_ISAIO))
-		ret = wait_on_sync_kiocb(iocb);
 	if (ret > 0)
 		XFS_STATS_ADD(xs_read_bytes, ret);
 
@@ -774,9 +772,6 @@ write_retry:
 
 	current->backing_dev_info = NULL;
 
-	if (ret == -EIOCBQUEUED && !(ioflags & IO_ISAIO))
-		ret = wait_on_sync_kiocb(iocb);
-
 	isize = i_size_read(inode);
 	if (unlikely(ret < 0 && ret != -EFAULT && *offset > isize))
 		*offset = isize;

fs/xfs/linux-2.6/xfs_vnode.h

@@ -36,7 +36,6 @@ struct attrlist_cursor_kern;
 /*
  * Flags for read/write calls - same values as IRIX
  */
-#define IO_ISAIO	0x00001		/* don't wait for completion */
 #define IO_ISDIRECT	0x00004		/* bypass page cache */
 #define IO_INVIS	0x00020		/* don't update inode timestamps */