NFS: Block new writes while syncing data in nfs_getattr()

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index f1fc0e4c1c02..0c3be2658546 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -649,7 +649,9 @@ int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
         trace_nfs_getattr_enter(inode);
         /* Flush out writes to the server in order to update c/mtime.  */
         if (S_ISREG(inode->i_mode)) {
+                mutex_lock(&inode->i_mutex);
                 err = nfs_sync_inode(inode);
+                mutex_unlock(&inode->i_mutex);
                 if (err)
                         goto out;
         }