1 files changed, 141 insertions, 0 deletions
diff --git a/source4/ntvfs/posix/pvfs_notify.c b/source4/ntvfs/posix/pvfs_notify.c
new file mode 100644
index 0000000000..566b6bc0e2
--- /dev/null
+++ b/source4/ntvfs/posix/pvfs_notify.c
@@ -0,0 +1,141 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   POSIX NTVFS backend - notify
+
+   Copyright (C) Andrew Tridgell 2006
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+#include "vfs_posix.h"
+#include "lib/messaging/irpc.h"
+#include "messaging/messaging.h"
+
+/* pending notifies buffer, hung off struct pvfs_file for open directories
+   that have used change notify */
+struct pvfs_notify_buffer {
+	struct pvfs_file *f;
+	uint32_t num_changes;
+	struct notify_changes *changes;
+	uint32_t max_buffer_size;
+	uint32_t current_buffer_size;
+	void *wait_handle;
+};
+
+
+/*
+  destroy a notify buffer. Called when the handle is closed
+ */
+static int pvfs_notify_destructor(void *ptr)
+{
+	struct pvfs_notify_buffer *n = talloc_get_type(ptr, struct pvfs_notify_buffer);
+	notify_remove(n->f->pvfs->notify_context, n);
+	n->f->notify_buffer = NULL;
+	return 0;
+}
+
+
+/*
+  called when a async notify event comes in
+*/
+static void pvfs_notify_callback(void *private, const struct notify_event *ev)
+{
+	struct pvfs_notify_buffer *n = talloc_get_type(private, struct pvfs_notify_buffer);
+	DEBUG(0,("got notify for '%s'\n", ev->path));
+}
+
+/*
+  setup a notify buffer on a directory handle
+*/
+static NTSTATUS pvfs_notify_setup(struct pvfs_state *pvfs, struct pvfs_file *f, 
+				  uint32_t buffer_size, uint32_t filter, BOOL recursive)
+{
+	NTSTATUS status;
+	struct notify_entry e;
+
+	f->notify_buffer = talloc_zero(f, struct pvfs_notify_buffer);
+	NT_STATUS_HAVE_NO_MEMORY(f->notify_buffer);
+
+	f->notify_buffer->max_buffer_size = buffer_size;
+	f->notify_buffer->f = f;
+
+	e.filter    = filter;
+	e.path      = f->handle->name->full_name;
+	e.recursive = recursive;
+
+	status = notify_add(pvfs->notify_context, &e, 
+			    pvfs_notify_callback, f->notify_buffer);
+	NT_STATUS_NOT_OK_RETURN(status);
+
+	talloc_set_destructor(f->notify_buffer, pvfs_notify_destructor);
+
+	return NT_STATUS_OK;
+}
+
+
+/* change notify request - always async. This request blocks until the
+   event buffer is non-empty */
+NTSTATUS pvfs_notify(struct ntvfs_module_context *ntvfs, 
+		     struct ntvfs_request *req,
+		     struct smb_notify *info)
+{
+	struct pvfs_state *pvfs = talloc_get_type(ntvfs->private_data, 
+						  struct pvfs_state);
+	struct pvfs_file *f;
+	NTSTATUS status;
+
+	f = pvfs_find_fd(pvfs, req, info->in.file.fnum);
+	if (!f) {
+		return NT_STATUS_INVALID_HANDLE;
+	}
+
+	/* this request doesn't make sense unless its async */
+	if (!(req->async_states->state & NTVFS_ASYNC_STATE_MAY_ASYNC)) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	/* its only valid for directories */
+	if (f->handle->fd != -1) {
+		return NT_STATUS_NOT_A_DIRECTORY;
+	}
+
+	/* if the handle doesn't currently have a notify buffer then
+	   create one */
+	if (f->notify_buffer == NULL) {
+		status = pvfs_notify_setup(pvfs, f, 
+					   info->in.buffer_size, 
+					   info->in.completion_filter,
+					   info->in.recursive);
+		NT_STATUS_NOT_OK_RETURN(status);
+	}
+
+	/* if the buffer is empty then start waiting */
+	if (f->notify_buffer->num_changes == 0) {
+		req->async_states->state |= NTVFS_ASYNC_STATE_ASYNC;
+		return NT_STATUS_OK;
+	}
+
+	/* otherwise if the buffer is not empty then return its
+	   contents immediately */
+	info->out.num_changes = f->notify_buffer->num_changes;
+	info->out.changes = talloc_steal(req, f->notify_buffer->changes);
+	f->notify_buffer->num_changes = 0;
+	f->notify_buffer->changes = NULL;
+	f->notify_buffer->current_buffer_size = 0;
+
+	return NT_STATUS_OK;
+}