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/*
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;
/* these last two are only present when a notify request is
pending */
struct ntvfs_request *req;
struct smb_notify *info;
};
/*
send a reply to a pending notify request
*/
static void pvfs_notify_send(struct pvfs_notify_buffer *notify_buffer, NTSTATUS status)
{
struct ntvfs_request *req = notify_buffer->req;
struct smb_notify *info = notify_buffer->info;
info->out.num_changes = notify_buffer->num_changes;
info->out.changes = talloc_steal(req, notify_buffer->changes);
notify_buffer->num_changes = 0;
notify_buffer->changes = NULL;
notify_buffer->current_buffer_size = 0;
notify_buffer->req = NULL;
notify_buffer->info = NULL;
DEBUG(0,("sending %d changes\n", info->out.num_changes));
if (info->out.num_changes != 0) {
status = NT_STATUS_OK;
}
req->async_states->status = status;
req->async_states->send_fn(req);
}
/*
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;
if (n->req) {
pvfs_notify_send(n, NT_STATUS_OK);
}
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);
n->changes = talloc_realloc(n, n->changes, struct notify_changes, n->num_changes+1);
n->changes[n->num_changes].action = ev->action;
n->changes[n->num_changes].name.s = talloc_strdup(n->changes, ev->path);
n->num_changes++;
DEBUG(0,("got notify for '%s' action=%d\n", ev->path, ev->action));
if (n->req != NULL) {
pvfs_notify_send(n, NT_STATUS_OK);
}
}
/*
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;
}
/*
called from the pvfs_wait code when either an event has come in, or
the notify request has been cancelled
*/
static void pvfs_notify_end(void *private, enum pvfs_wait_notice reason)
{
struct pvfs_notify_buffer *notify_buffer = talloc_get_type(private, struct pvfs_notify_buffer);
struct ntvfs_request *req = notify_buffer->req;
if (req == NULL) {
/* nothing to do, nobody is waiting */
return;
}
if (reason == PVFS_WAIT_CANCEL) {
pvfs_notify_send(notify_buffer, NT_STATUS_CANCELLED);
} else {
pvfs_notify_send(notify_buffer, 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_INVALID_PARAMETER;
}
/* 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);
}
req->async_states->status = NT_STATUS_OK;
if (f->notify_buffer->req != NULL) {
DEBUG(0,("Notify already setup\n"));
pvfs_notify_send(f->notify_buffer, NT_STATUS_CANCELLED);
}
f->notify_buffer->req = talloc_reference(f->notify_buffer, req);
f->notify_buffer->info = info;
/* if the buffer is empty then start waiting */
if (f->notify_buffer->num_changes == 0) {
void *wait_handle =
pvfs_wait_message(pvfs, req, -1, timeval_zero(),
pvfs_notify_end, f->notify_buffer);
NT_STATUS_HAVE_NO_MEMORY(wait_handle);
talloc_steal(req, wait_handle);
return NT_STATUS_OK;
}
pvfs_notify_send(f->notify_buffer, NT_STATUS_OK);
return NT_STATUS_OK;
}
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