2 files changed, 21 insertions, 11 deletions

diff --git a/fs/nilfs2/file.c b/fs/nilfs2/file.c
index 26601529dc17..62cebc8e1a1f 100644
--- a/fs/nilfs2/file.c
+++ b/fs/nilfs2/file.c
@@ -37,6 +37,7 @@ int nilfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
          * This function should be implemented when the writeback function
          * will be implemented.
          */
+        struct the_nilfs *nilfs;
         struct inode *inode = file->f_mapping->host;
         int err;
 
@@ -45,18 +46,21 @@ int nilfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
                 return err;
         mutex_lock(&inode->i_mutex);
 
-        if (!nilfs_inode_dirty(inode)) {
-                mutex_unlock(&inode->i_mutex);
-                return 0;
+        if (nilfs_inode_dirty(inode)) {
+                if (datasync)
+                        err = nilfs_construct_dsync_segment(inode->i_sb, inode,
+                                                            0, LLONG_MAX);
+                else
+                        err = nilfs_construct_segment(inode->i_sb);
         }
-
-        if (datasync)
-                err = nilfs_construct_dsync_segment(inode->i_sb, inode, 0,
-                                                    LLONG_MAX);
-        else
-                err = nilfs_construct_segment(inode->i_sb);
-
         mutex_unlock(&inode->i_mutex);
+
+        nilfs = inode->i_sb->s_fs_info;
+        if (!err && nilfs_test_opt(nilfs, BARRIER)) {
+                err = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
+                if (err != -EIO)
+                        err = 0;
+        }
         return err;
 }
 
diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c
index 2a70fce70c65..06658caa18bd 100644
--- a/fs/nilfs2/ioctl.c
+++ b/fs/nilfs2/ioctl.c
@@ -692,8 +692,14 @@ static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
         if (ret < 0)
                 return ret;
 
+        nilfs = inode->i_sb->s_fs_info;
+        if (nilfs_test_opt(nilfs, BARRIER)) {
+                ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
+                if (ret == -EIO)
+                        return ret;
+        }
+
         if (argp != NULL) {
-                nilfs = inode->i_sb->s_fs_info;
                 down_read(&nilfs->ns_segctor_sem);
                 cno = nilfs->ns_cno - 1;
                 up_read(&nilfs->ns_segctor_sem);