NFS: Don't let nfs_end_data_update() clobber attribute update information

 Since we almost always call nfs_end_data_update() after we called
 nfs_refresh_inode(), we now end up marking the inode metadata
 as needing revalidation immediately after having updated it.

 This patch rearranges things so that we mark the inode as needing
 revalidation _before_ we call nfs_refresh_inode() on those operations
 that need it.

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

fs/nfs/inode.c

@@ -1236,13 +1236,12 @@ void nfs_end_data_update(struct inode *inode)
 	struct nfs_inode *nfsi = NFS_I(inode);
 
 	if (!nfs_have_delegation(inode, FMODE_READ)) {
-		/* Mark the attribute cache for revalidation */
-		spin_lock(&inode->i_lock);
-		nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
-		/* Directories and symlinks: invalidate page cache too */
-		if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
+		/* Directories and symlinks: invalidate page cache */
+		if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) {
+			spin_lock(&inode->i_lock);
 			nfsi->cache_validity |= NFS_INO_INVALID_DATA;
-		spin_unlock(&inode->i_lock);
+			spin_unlock(&inode->i_lock);
+		}
 	}
 	nfsi->cache_change_attribute = jiffies;
 	atomic_dec(&nfsi->data_updates);
@@ -1360,6 +1359,33 @@ int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
 	return status;
 }
 
+/**
+ * nfs_post_op_update_inode - 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.
+ */
+int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
+{
+	struct nfs_inode *nfsi = NFS_I(inode);
+	int status = 0;
+
+	spin_lock(&inode->i_lock);
+	if (unlikely((fattr->valid & NFS_ATTR_FATTR) == 0)) {
+		nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
+		goto out;
+	}
+	status = nfs_update_inode(inode, fattr, fattr->time_start);
+	if (time_after_eq(fattr->time_start, nfsi->cache_change_attribute))
+		nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME|NFS_INO_REVAL_PAGECACHE);
+	nfsi->cache_change_attribute = jiffies;
+out:
+	spin_unlock(&inode->i_lock);
+	return status;
+}
+
 /*
  * Many nfs protocol calls return the new file attributes after
  * an operation.  Here we update the inode to reflect the state

fs/nfs/nfs3proc.c

@@ -266,7 +266,7 @@ static int nfs3_proc_write(struct nfs_write_data *wdata)
 	nfs_fattr_init(fattr);
 	status = rpc_call_sync(NFS_CLIENT(inode), &msg, rpcflags);
 	if (status >= 0)
-		nfs_refresh_inode(inode, fattr);
+		nfs_post_op_update_inode(inode, fattr);
 	dprintk("NFS reply write: %d\n", status);
 	return status < 0? status : wdata->res.count;
 }
@@ -288,7 +288,7 @@ static int nfs3_proc_commit(struct nfs_write_data *cdata)
 	nfs_fattr_init(fattr);
 	status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
 	if (status >= 0)
-		nfs_refresh_inode(inode, fattr);
+		nfs_post_op_update_inode(inode, fattr);
 	dprintk("NFS reply commit: %d\n", status);
 	return status;
 }
@@ -332,7 +332,7 @@ again:
 	nfs_fattr_init(&dir_attr);
 	nfs_fattr_init(&fattr);
 	status = rpc_call(NFS_CLIENT(dir), NFS3PROC_CREATE, &arg, &res, 0);
-	nfs_refresh_inode(dir, &dir_attr);
+	nfs_post_op_update_inode(dir, &dir_attr);
 
 	/* If the server doesn't support the exclusive creation semantics,
 	 * try again with simple 'guarded' mode. */
@@ -403,7 +403,7 @@ nfs3_proc_remove(struct inode *dir, struct qstr *name)
 	dprintk("NFS call  remove %s\n", name->name);
 	nfs_fattr_init(&dir_attr);
 	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
-	nfs_refresh_inode(dir, &dir_attr);
+	nfs_post_op_update_inode(dir, &dir_attr);
 	dprintk("NFS reply remove: %d\n", status);
 	return status;
 }
@@ -439,7 +439,7 @@ nfs3_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
 		return 1;
 	if (msg->rpc_argp) {
 		dir_attr = (struct nfs_fattr*)msg->rpc_resp;
-		nfs_refresh_inode(dir->d_inode, dir_attr);
+		nfs_post_op_update_inode(dir->d_inode, dir_attr);
 		kfree(msg->rpc_argp);
 	}
 	return 0;
@@ -468,8 +468,8 @@ nfs3_proc_rename(struct inode *old_dir, struct qstr *old_name,
 	nfs_fattr_init(&old_dir_attr);
 	nfs_fattr_init(&new_dir_attr);
 	status = rpc_call(NFS_CLIENT(old_dir), NFS3PROC_RENAME, &arg, &res, 0);
-	nfs_refresh_inode(old_dir, &old_dir_attr);
-	nfs_refresh_inode(new_dir, &new_dir_attr);
+	nfs_post_op_update_inode(old_dir, &old_dir_attr);
+	nfs_post_op_update_inode(new_dir, &new_dir_attr);
 	dprintk("NFS reply rename: %d\n", status);
 	return status;
 }
@@ -494,8 +494,8 @@ nfs3_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
 	nfs_fattr_init(&dir_attr);
 	nfs_fattr_init(&fattr);
 	status = rpc_call(NFS_CLIENT(inode), NFS3PROC_LINK, &arg, &res, 0);
-	nfs_refresh_inode(dir, &dir_attr);
-	nfs_refresh_inode(inode, &fattr);
+	nfs_post_op_update_inode(dir, &dir_attr);
+	nfs_post_op_update_inode(inode, &fattr);
 	dprintk("NFS reply link: %d\n", status);
 	return status;
 }
@@ -527,7 +527,7 @@ nfs3_proc_symlink(struct inode *dir, struct qstr *name, struct qstr *path,
 	nfs_fattr_init(&dir_attr);
 	nfs_fattr_init(fattr);
 	status = rpc_call(NFS_CLIENT(dir), NFS3PROC_SYMLINK, &arg, &res, 0);
-	nfs_refresh_inode(dir, &dir_attr);
+	nfs_post_op_update_inode(dir, &dir_attr);
 	dprintk("NFS reply symlink: %d\n", status);
 	return status;
 }
@@ -558,7 +558,7 @@ nfs3_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
 	nfs_fattr_init(&dir_attr);
 	nfs_fattr_init(&fattr);
 	status = rpc_call(NFS_CLIENT(dir), NFS3PROC_MKDIR, &arg, &res, 0);
-	nfs_refresh_inode(dir, &dir_attr);
+	nfs_post_op_update_inode(dir, &dir_attr);
 	if (status != 0)
 		goto out;
 	status = nfs_instantiate(dentry, &fhandle, &fattr);
@@ -584,7 +584,7 @@ nfs3_proc_rmdir(struct inode *dir, struct qstr *name)
 	dprintk("NFS call  rmdir %s\n", name->name);
 	nfs_fattr_init(&dir_attr);
 	status = rpc_call(NFS_CLIENT(dir), NFS3PROC_RMDIR, &arg, &dir_attr, 0);
-	nfs_refresh_inode(dir, &dir_attr);
+	nfs_post_op_update_inode(dir, &dir_attr);
 	dprintk("NFS reply rmdir: %d\n", status);
 	return status;
 }
@@ -679,7 +679,7 @@ nfs3_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 	nfs_fattr_init(&dir_attr);
 	nfs_fattr_init(&fattr);
 	status = rpc_call(NFS_CLIENT(dir), NFS3PROC_MKNOD, &arg, &res, 0);
-	nfs_refresh_inode(dir, &dir_attr);
+	nfs_post_op_update_inode(dir, &dir_attr);
 	if (status != 0)
 		goto out;
 	status = nfs_instantiate(dentry, &fh, &fattr);
@@ -775,7 +775,7 @@ nfs3_write_done(struct rpc_task *task)
 		return;
 	data = (struct nfs_write_data *)task->tk_calldata;
 	if (task->tk_status >= 0)
-		nfs_refresh_inode(data->inode, data->res.fattr);
+		nfs_post_op_update_inode(data->inode, data->res.fattr);
 	nfs_writeback_done(task);
 }
 
@@ -819,7 +819,7 @@ nfs3_commit_done(struct rpc_task *task)
 		return;
 	data = (struct nfs_write_data *)task->tk_calldata;
 	if (task->tk_status >= 0)
-		nfs_refresh_inode(data->inode, data->res.fattr);
+		nfs_post_op_update_inode(data->inode, data->res.fattr);
 	nfs_commit_done(task);
 }
 

fs/nfs/nfs4proc.c

@@ -187,8 +187,11 @@ static void update_changeattr(struct inode *inode, struct nfs4_change_info *cinf
 {
 	struct nfs_inode *nfsi = NFS_I(inode);
 
+	spin_lock(&inode->i_lock);
+	nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
 	if (cinfo->before == nfsi->change_attr && cinfo->atomic)
 		nfsi->change_attr = cinfo->after;
+	spin_unlock(&inode->i_lock);
 }
 
 /* Helper for asynchronous RPC calls */

fs/nfs/proc.c

@@ -206,7 +206,7 @@ static int nfs_proc_write(struct nfs_write_data *wdata)
 	nfs_fattr_init(fattr);
 	status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags);
 	if (status >= 0) {
-		nfs_refresh_inode(inode, fattr);
+		nfs_post_op_update_inode(inode, fattr);
 		wdata->res.count = wdata->args.count;
 		wdata->verf.committed = NFS_FILE_SYNC;
 	}
@@ -275,6 +275,7 @@ nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 
 	nfs_fattr_init(&fattr);
 	status = rpc_call(NFS_CLIENT(dir), NFSPROC_CREATE, &arg, &res, 0);
+	nfs_mark_for_revalidate(dir);
 
 	if (status == -EINVAL && S_ISFIFO(mode)) {
 		sattr->ia_mode = mode;
@@ -305,6 +306,7 @@ nfs_proc_remove(struct inode *dir, struct qstr *name)
 
 	dprintk("NFS call  remove %s\n", name->name);
 	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
+	nfs_mark_for_revalidate(dir);
 
 	dprintk("NFS reply remove: %d\n", status);
 	return status;
@@ -331,8 +333,10 @@ nfs_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
 {
 	struct rpc_message *msg = &task->tk_msg;
 	
-	if (msg->rpc_argp)
+	if (msg->rpc_argp) {
+		nfs_mark_for_revalidate(dir->d_inode);
 		kfree(msg->rpc_argp);
+	}
 	return 0;
 }
 
@@ -352,6 +356,8 @@ nfs_proc_rename(struct inode *old_dir, struct qstr *old_name,
 
 	dprintk("NFS call  rename %s -> %s\n", old_name->name, new_name->name);
 	status = rpc_call(NFS_CLIENT(old_dir), NFSPROC_RENAME, &arg, NULL, 0);
+	nfs_mark_for_revalidate(old_dir);
+	nfs_mark_for_revalidate(new_dir);
 	dprintk("NFS reply rename: %d\n", status);
 	return status;
 }
@@ -369,6 +375,7 @@ nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
 
 	dprintk("NFS call  link %s\n", name->name);
 	status = rpc_call(NFS_CLIENT(inode), NFSPROC_LINK, &arg, NULL, 0);
+	nfs_mark_for_revalidate(dir);
 	dprintk("NFS reply link: %d\n", status);
 	return status;
 }
@@ -394,6 +401,7 @@ nfs_proc_symlink(struct inode *dir, struct qstr *name, struct qstr *path,
 	nfs_fattr_init(fattr);
 	fhandle->size = 0;
 	status = rpc_call(NFS_CLIENT(dir), NFSPROC_SYMLINK, &arg, NULL, 0);
+	nfs_mark_for_revalidate(dir);
 	dprintk("NFS reply symlink: %d\n", status);
 	return status;
 }
@@ -418,6 +426,7 @@ nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
 	dprintk("NFS call  mkdir %s\n", dentry->d_name.name);
 	nfs_fattr_init(&fattr);
 	status = rpc_call(NFS_CLIENT(dir), NFSPROC_MKDIR, &arg, &res, 0);
+	nfs_mark_for_revalidate(dir);
 	if (status == 0)
 		status = nfs_instantiate(dentry, &fhandle, &fattr);
 	dprintk("NFS reply mkdir: %d\n", status);
@@ -436,6 +445,7 @@ nfs_proc_rmdir(struct inode *dir, struct qstr *name)
 
 	dprintk("NFS call  rmdir %s\n", name->name);
 	status = rpc_call(NFS_CLIENT(dir), NFSPROC_RMDIR, &arg, NULL, 0);
+	nfs_mark_for_revalidate(dir);
 	dprintk("NFS reply rmdir: %d\n", status);
 	return status;
 }
@@ -579,7 +589,7 @@ nfs_write_done(struct rpc_task *task)
 	struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
 
 	if (task->tk_status >= 0)
-		nfs_refresh_inode(data->inode, data->res.fattr);
+		nfs_post_op_update_inode(data->inode, data->res.fattr);
 	nfs_writeback_done(task);
 }
 

include/linux/nfs_fs.h

@@ -241,13 +241,17 @@ static inline int nfs_caches_unstable(struct inode *inode)
 	return atomic_read(&NFS_I(inode)->data_updates) != 0;
 }
 
+static inline void nfs_mark_for_revalidate(struct inode *inode)
+{
+	spin_lock(&inode->i_lock);
+	NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
+	spin_unlock(&inode->i_lock);
+}
+
 static inline void NFS_CACHEINV(struct inode *inode)
 {
-	if (!nfs_caches_unstable(inode)) {
-		spin_lock(&inode->i_lock);
-		NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
-		spin_unlock(&inode->i_lock);
-	}
+	if (!nfs_caches_unstable(inode))
+		nfs_mark_for_revalidate(inode);
 }
 
 static inline int nfs_server_capable(struct inode *inode, int cap)
@@ -291,6 +295,7 @@ extern void nfs_zap_caches(struct inode *);
 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_getattr(struct vfsmount *, struct dentry *, struct kstat *);
 extern int nfs_permission(struct inode *, int, struct nameidata *);
 extern int nfs_access_get_cached(struct inode *, struct rpc_cred *, struct nfs_access_entry *);