[PATCH 15/17] orangefs: avoid fsync service operation on flush

[Martin Brandenburg]

Without this, an fsync call is sent to the server even if no data
changed.  This resulted in a rather severe (50%) performance regression
under certain metadata-heavy workloads.

In the past, everything was direct IO.  Nothing happend on a close call.
An explicit fsync call would send an fsync request to the server which
in turn fsynced the underlying file.

Now there are cached writes.  Then fsync began writing out dirty pages
in addition to making an fsync request to the server, and close began
calling fsync.

With this commit, close only writes out dirty pages, and does not make
the fsync request.

Signed-off-by: Martin Brandenburg <martin@xxxxxxxxxxxx>
---
 fs/orangefs/file.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/fs/orangefs/file.c b/fs/orangefs/file.c
index 5eda483263ae..d5ecfea3288a 100644
--- a/fs/orangefs/file.c
+++ b/fs/orangefs/file.c
@@ -596,7 +596,24 @@ static int orangefs_lock(struct file *filp, int cmd, struct file_lock *fl)
 
 int orangefs_flush(struct file *file, fl_owner_t id)
 {
-	return vfs_fsync(file, 0);
+	/*
+	 * This is vfs_fsync_range(file, 0, LLONG_MAX, 0) without the
+	 * service_operation in orangefs_fsync.
+	 *
+	 * Do not send fsync to OrangeFS server on a close.  Do send fsync
+	 * on an explicit fsync call.  This duplicates historical OrangeFS
+	 * behavior.
+	 */
+	struct inode *inode = file->f_mapping->host;
+
+	if (inode->i_state & I_DIRTY_TIME) {
+		spin_lock(&inode->i_lock);
+		inode->i_state &= ~I_DIRTY_TIME;
+		spin_unlock(&inode->i_lock);
+		mark_inode_dirty_sync(inode);
+	}
+
+	return filemap_write_and_wait_range(file->f_mapping, 0, LLONG_MAX);
 }
 
 /** ORANGEFS implementation of VFS file operations */
-- 
2.19.0