6 files changed, 40 insertions, 4 deletions

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 23feb9e3d8b0..c5f4e0567533 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -793,6 +793,12 @@ static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
 {
         struct nfs_inode *nfsi = NFS_I(inode);
 
+        if ((fattr->valid & NFS_ATTR_WCC_V4) != 0 &&
+                        nfsi->change_attr == fattr->pre_change_attr) {
+                nfsi->change_attr = fattr->change_attr;
+                if (S_ISDIR(inode->i_mode))
+                        nfsi->cache_validity |= NFS_INO_INVALID_DATA;
+        }
         /* If we have atomic WCC data, we may update some attributes */
         if ((fattr->valid & NFS_ATTR_WCC) != 0) {
                 if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime))
@@ -923,6 +929,34 @@ out:
         return status;
 }
 
+/**
+ * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
+ * @inode - pointer to inode
+ * @fattr - updated attributes
+ *
+ * After an operation that has changed the inode metadata, mark the
+ * attribute cache as being invalid, then try to update it. Fake up
+ * weak cache consistency data, if none exist.
+ *
+ * This function is mainly designed to be used by the ->write_done() functions.
+ */
+int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
+{
+        if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 &&
+                        (fattr->valid & NFS_ATTR_WCC_V4) == 0) {
+                fattr->pre_change_attr = NFS_I(inode)->change_attr;
+                fattr->valid |= NFS_ATTR_WCC_V4;
+        }
+        if ((fattr->valid & NFS_ATTR_FATTR) != 0 &&
+                        (fattr->valid & NFS_ATTR_WCC) == 0) {
+                memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
+                memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
+                fattr->pre_size = inode->i_size;
+                fattr->valid |= NFS_ATTR_WCC;
+        }
+        return nfs_post_op_update_inode(inode, fattr);
+}
+
 /*
  * Many nfs protocol calls return the new file attributes after
  * an operation.  Here we update the inode to reflect the state
diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c
index fc6b1193a631..ce1fb99e67e1 100644
--- a/fs/nfs/nfs3proc.c
+++ b/fs/nfs/nfs3proc.c
@@ -750,7 +750,7 @@ static int nfs3_write_done(struct rpc_task *task, struct nfs_write_data *data)
         if (nfs3_async_handle_jukebox(task, data->inode))
                 return -EAGAIN;
         if (task->tk_status >= 0)
-                nfs_post_op_update_inode(data->inode, data->res.fattr);
+                nfs_post_op_update_inode_force_wcc(data->inode, data->res.fattr);
         return 0;
 }
 
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index d311984d2c88..796bc8ea7194 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2427,7 +2427,7 @@ static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
         }
         if (task->tk_status >= 0) {
                 renew_lease(NFS_SERVER(inode), data->timestamp);
-                nfs_post_op_update_inode(inode, data->res.fattr);
+                nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
         }
         return 0;
 }
diff --git a/fs/nfs/proc.c b/fs/nfs/proc.c
index ec3ede890bf4..97669ed05500 100644
--- a/fs/nfs/proc.c
+++ b/fs/nfs/proc.c
@@ -579,7 +579,7 @@ static void nfs_proc_read_setup(struct nfs_read_data *data)
 static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data)
 {
         if (task->tk_status >= 0)
-                nfs_post_op_update_inode(data->inode, data->res.fattr);
+                nfs_post_op_update_inode_force_wcc(data->inode, data->res.fattr);
         return 0;
 }
 
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index 63850a884902..9449286c5867 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -293,6 +293,7 @@ extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
                                 struct nfs_fattr *);
 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
+extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
 extern int nfs_permission(struct inode *, int, struct nameidata *);
 extern int nfs_open(struct inode *, struct file *);
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 03032017ffaa..daab252f2e5c 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -62,7 +62,8 @@ struct nfs_fattr {
 #define NFS_ATTR_FATTR          0x0002          /* post-op attributes */
 #define NFS_ATTR_FATTR_V3       0x0004          /* NFSv3 attributes */
 #define NFS_ATTR_FATTR_V4       0x0008          /* NFSv4 change attribute */
-#define NFS_ATTR_FATTR_V4_REFERRAL      0x0010          /* NFSv4 referral */
+#define NFS_ATTR_WCC_V4         0x0010          /* pre-op change attribute */
+#define NFS_ATTR_FATTR_V4_REFERRAL      0x0020          /* NFSv4 referral */
 
 /*
  * Info on the file system