[GFS2] Don't flush everything on fdatasync

The gfs2_fsync() function was doing a journal flush on each
and every call. While this is correct, its also a lot of
overhead. This patch means that on fdatasync flushes we
rely on the VFS to flush the data for us and we don't do
a journal flush unless we really need to.

We have to do a journal flush for stuffed files though because
they have the data and the inode metadata in the same block.
Journaled files also need a journal flush too of course.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 27 insertions, 3 deletions

diff --git a/fs/gfs2/ops_file.c b/fs/gfs2/ops_file.c
index c2be216eb928..7bd971bf7cdd 100644
--- a/fs/gfs2/ops_file.c
+++ b/fs/gfs2/ops_file.c
@@ -22,6 +22,7 @@
 #include <linux/ext2_fs.h>
 #include <linux/crc32.h>
 #include <linux/lm_interface.h>
+#include <linux/writeback.h>
 #include <asm/uaccess.h>
 
 #include "gfs2.h"
@@ -503,16 +504,39 @@ static int gfs2_close(struct inode *inode, struct file *file)
  * @file: the file that points to the dentry (we ignore this)
  * @dentry: the dentry that points to the inode to sync
  *
+ * The VFS will flush "normal" data for us. We only need to worry
+ * about metadata here. For journaled data, we just do a log flush
+ * as we can't avoid it. Otherwise we can just bale out if datasync
+ * is set. For stuffed inodes we must flush the log in order to
+ * ensure that all data is on disk.
+ *
  * Returns: errno
  */
 
 static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync)
 {
-        struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
+        struct inode *inode = dentry->d_inode;
+        int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC);
+        int ret = 0;
+        struct writeback_control wbc = {
+                .sync_mode = WB_SYNC_ALL,
+                .nr_to_write = 0,
+        };
+
+        if (gfs2_is_jdata(GFS2_I(inode))) {
+                gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
+                return 0;
+        }
 
-        gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
+        if (sync_state != 0) {
+                if (!datasync)
+                        ret = sync_inode(inode, &wbc);
 
-        return 0;
+                if (gfs2_is_stuffed(GFS2_I(inode)))
+                        gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
+        }
+
+        return ret;
 }
 
 /**