X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=fs%2Fbtrfs%2Ffile.c;h=36861b7a6757673189737024b62fcce9842bc3d0;hb=a65c86630632c534e9dd3cf76c1c5a5c98970873;hp=f15c13f970180c51abd31d08d763f3145b3afe9e;hpb=51f395ad4058883e4273b02fdebe98072dbdc0d2;p=karo-tx-linux.git

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index f15c13f97018..36861b7a6757 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1840,7 +1840,15 @@ int btrfs_release_file(struct inode *inode, struct file *filp)
 {
 	if (filp->private_data)
 		btrfs_ioctl_trans_end(filp);
-	filemap_flush(inode->i_mapping);
+	/*
+	 * ordered_data_close is set by settattr when we are about to truncate
+	 * a file from a non-zero size to a zero size.  This tries to
+	 * flush down new bytes that may have been written if the
+	 * application were using truncate to replace a file in place.
+	 */
+	if (test_and_clear_bit(BTRFS_INODE_ORDERED_DATA_CLOSE,
+			       &BTRFS_I(inode)->runtime_flags))
+			filemap_flush(inode->i_mapping);
 	return 0;
 }