Wait for all direct I/O requests to finish before performing a truncate.

Signed-off-by: Christoph Hellwig <hch@lst.de>

Index: linux-2.6/fs/btrfs/inode.c
===================================================================
--- linux-2.6.orig/fs/btrfs/inode.c	2011-06-11 12:58:46.615017504 +0200
+++ linux-2.6/fs/btrfs/inode.c	2011-06-11 12:59:23.218348984 +0200
@@ -3550,6 +3550,8 @@ static int btrfs_setsize(struct inode *i
 	loff_t oldsize = i_size_read(inode);
 	int ret;
 
+	inode_dio_wait(inode);
+
 	if (newsize == oldsize)
 		return 0;
 

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