NFS: fsync() must exit with an error if page writeback failed

We need to ensure that if the call to filemap_write_and_wait_range()
fails, then we report that error back to the application.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
index acb65e7887f8..eb5eb8eef4d3 100644
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -96,13 +96,15 @@ nfs4_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
         struct inode *inode = file->f_path.dentry->d_inode;
 
         ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
+        if (ret != 0)
+                goto out;
         mutex_lock(&inode->i_mutex);
         ret = nfs_file_fsync_commit(file, start, end, datasync);
         if (!ret && !datasync)
                 /* application has asked for meta-data sync */
                 ret = pnfs_layoutcommit_inode(inode, true);
         mutex_unlock(&inode->i_mutex);
-
+out:
         return ret;
 }