3.16-stable review patch. If anyone has any objections, please let me know.
------------------
From: Chris Mason <clm@xxxxxx>
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@xxxxxx>
Reported-by: Miao Xie <miaox@xxxxxxxxxxxxxx>
Reported-by: Fengguang Wu <fengguang.wu@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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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