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

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

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index f1fc0e4..0c3be26 100644 (file)
--- 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;
        }