NFS: Don't use readdirplus data if the page cache is invalid

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

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 6518b09..9f8ec3c 100644 (file)
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -1110,6 +1110,7 @@ static struct dentry *nfs_readdir_lookup(nfs_readdir_descriptor_t *desc)
                .len = entry->len,
        };
        struct inode *inode;
+       unsigned long verf = nfs_save_change_attribute(dir);
 
        switch (name.len) {
                case 2:
@@ -1120,6 +1121,14 @@ static struct dentry *nfs_readdir_lookup(nfs_readdir_descriptor_t *desc)
                        if (name.name[0] == '.')
                                return dget(parent);
        }
+
+       spin_lock(&dir->i_lock);
+       if (NFS_I(dir)->cache_validity & NFS_INO_INVALID_DATA) {
+               spin_unlock(&dir->i_lock);
+               return NULL;
+       }
+       spin_unlock(&dir->i_lock);
+
        name.hash = full_name_hash(name.name, name.len);
        dentry = d_lookup(parent, &name);
        if (dentry != NULL) {
@@ -1161,7 +1170,7 @@ static struct dentry *nfs_readdir_lookup(nfs_readdir_descriptor_t *desc)
        }
 
 out_renew:
-       nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
+       nfs_set_verifier(dentry, verf);
        return dentry;
 }