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

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

1 files changed, 10 insertions, 1 deletions

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 6518b098e625..9f8ec3c3e6a7 100644
--- 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;
 }