linux-kernel - [PATCH 3.16 090/125] Btrfs: fix filemap_flush call in btrfs_file

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Date:	Wed,  3 Sep 2014 15:07:27 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Chris Mason <clm@...com>,
	Miao Xie <miaox@...fujitsu.com>,
	Fengguang Wu <fengguang.wu@...el.com>
Subject: [PATCH 3.16 090/125] Btrfs: fix filemap_flush call in btrfs_file_release

3.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Chris Mason <clm@...com>

commit f6dc45c7a93a011dff6eb9b2ffda59c390c7705a upstream.

We should only be flushing on close if the file was flagged as needing
it during truncate.  I broke this with my ordered data vs transaction
commit deadlock fix.

Thanks to Miao Xie for catching this.

Signed-off-by: Chris Mason <clm@...com>
Reported-by: Miao Xie <miaox@...fujitsu.com>
Reported-by: Fengguang Wu <fengguang.wu@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/btrfs/file.c |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1840,7 +1840,15 @@ int btrfs_release_file(struct inode *ino
 {
 	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;
 }
 


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