r23784: use the GPLv3 boilerplate as recommended by the FSF and the license text
[tprouty/samba.git] / source / smbd / notify.c
index 49a516b907d018d8cf3630e62829817656d746a8..6ab4266c19f04410cdc49b9bea876a10ec19bdf1 100644 (file)
@@ -3,10 +3,11 @@
    change notify handling
    Copyright (C) Andrew Tridgell 2000
    Copyright (C) Jeremy Allison 1994-1998
+   Copyright (C) Volker Lendecke 2007
 
    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
+   the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    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.
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #include "includes.h"
 
-static struct cnotify_fns *cnotify;
+/* Max size we can send to client in a notify response. */
+extern int max_send;
+
+struct notify_change_request {
+       struct notify_change_request *prev, *next;
+       struct files_struct *fsp;       /* backpointer for cancel by mid */
+       char request_buf[smb_size];
+       uint32 filter;
+       uint32 current_bufsize;
+       struct notify_mid_map *mid_map;
+       void *backend_data;
+};
+
+static void notify_fsp(files_struct *fsp, uint32 action, const char *name);
+
 static struct notify_mid_map *notify_changes_by_mid;
 
-/****************************************************************************
- This is the structure to queue to implement NT change
- notify. It consists of smb_size bytes stored from the
- transact command (to keep the mid, tid etc around).
- Plus the fid to examine and notify private data.
-*****************************************************************************/
+/*
+ * For NTCancel, we need to find the notify_change_request indexed by
+ * mid. Separate list here.
+ */
 
-struct change_notify {
-       struct change_notify *next, *prev;
-       files_struct *fsp;
-       uint32 flags;
-       uint32 max_param_count;
-       char request_buf[smb_size];
-       void *change_data;
+struct notify_mid_map {
+       struct notify_mid_map *prev, *next;
+       struct notify_change_request *req;
+       uint16 mid;
 };
 
-static struct change_notify *change_notify_list;
+static BOOL notify_change_record_identical(struct notify_change *c1,
+                                       struct notify_change *c2)
+{
+       /* Note this is deliberately case sensitive. */
+       if (c1->action == c2->action &&
+                       strcmp(c1->name, c2->name) == 0) {
+               return True;
+       }
+       return False;
+}
 
-static BOOL notify_marshall_changes(unsigned num_changes,
+static BOOL notify_marshall_changes(int num_changes,
                                    struct notify_change *changes,
                                    prs_struct *ps)
 {
@@ -50,11 +68,20 @@ static BOOL notify_marshall_changes(unsigned num_changes,
        UNISTR uni_name;
 
        for (i=0; i<num_changes; i++) {
-               struct notify_change *c = &changes[i];
+               struct notify_change *c;
                size_t namelen;
                uint32 u32_tmp; /* Temp arg to prs_uint32 to avoid
                                 * signed/unsigned issues */
 
+               /* Coalesce any identical records. */
+               while (i+1 < num_changes &&
+                       notify_change_record_identical(&changes[i],
+                                               &changes[i+1])) {
+                       i++;
+               }
+
+               c = &changes[i];
+
                namelen = convert_string_allocate(
                        NULL, CH_UNIX, CH_UTF16LE, c->name, strlen(c->name)+1,
                        &uni_name.buffer, True);
@@ -98,8 +125,10 @@ static BOOL notify_marshall_changes(unsigned num_changes,
  Setup the common parts of the return packet and send it.
 *****************************************************************************/
 
-void change_notify_reply_packet(const char *request_buf, NTSTATUS error_code)
+static void change_notify_reply_packet(const char *request_buf,
+                                      NTSTATUS error_code)
 {
+       const char *inbuf = request_buf;
        char outbuf[smb_size+38];
 
        memset(outbuf, '\0', sizeof(outbuf));
@@ -111,27 +140,36 @@ void change_notify_reply_packet(const char *request_buf, NTSTATUS error_code)
         * Seems NT needs a transact command with an error code
         * in it. This is a longer packet than a simple error.
         */
-       set_message(outbuf,18,0,False);
+       set_message(inbuf,outbuf,18,0,False);
 
        show_msg(outbuf);
        if (!send_smb(smbd_server_fd(),outbuf))
-               exit_server_cleanly("change_notify_reply_packet: send_smb failed.");
+               exit_server_cleanly("change_notify_reply_packet: send_smb "
+                                   "failed.");
 }
 
-void change_notify_reply(const char *request_buf, uint32 max_param_count,
-                        unsigned num_changes, struct notify_change *changes)
+void change_notify_reply(const char *request_buf,
+                        struct notify_change_buf *notify_buf)
 {
        char *outbuf = NULL;
        prs_struct ps;
-       size_t buflen = smb_size+38+max_param_count;
+       size_t buflen;
+
+       if (notify_buf->num_changes == -1) {
+               change_notify_reply_packet(request_buf, NT_STATUS_OK);
+               return;
+       }
 
        if (!prs_init(&ps, 0, NULL, False)
-           || !notify_marshall_changes(num_changes, changes, &ps)) {
+           || !notify_marshall_changes(notify_buf->num_changes,
+                                       notify_buf->changes, &ps)) {
                change_notify_reply_packet(request_buf, NT_STATUS_NO_MEMORY);
                goto done;
        }
 
-       if (prs_offset(&ps) > max_param_count) {
+       buflen = smb_size+38+prs_offset(&ps) + 4 /* padding */;
+
+       if (buflen > max_send) {
                /*
                 * We exceed what the client is willing to accept. Send
                 * nothing.
@@ -147,7 +185,7 @@ void change_notify_reply(const char *request_buf, uint32 max_param_count,
 
        construct_reply_common(request_buf, outbuf);
 
-       if (send_nt_replies(outbuf, buflen, NT_STATUS_OK, prs_data_p(&ps),
+       if (send_nt_replies(request_buf, outbuf, buflen, NT_STATUS_OK, prs_data_p(&ps),
                            prs_offset(&ps), NULL, 0) == -1) {
                exit_server("change_notify_reply_packet: send_smb failed.");
        }
@@ -155,22 +193,53 @@ void change_notify_reply(const char *request_buf, uint32 max_param_count,
  done:
        SAFE_FREE(outbuf);
        prs_mem_free(&ps);
+
+       TALLOC_FREE(notify_buf->changes);
+       notify_buf->num_changes = 0;
 }
 
-/****************************************************************************
- Remove an entry from the list and free it, also closing any
- directory handle if necessary.
-*****************************************************************************/
+static void notify_callback(void *private_data, const struct notify_event *e)
+{
+       files_struct *fsp = (files_struct *)private_data;
+       DEBUG(10, ("notify_callback called for %s\n", fsp->fsp_name));
+       notify_fsp(fsp, e->action, e->path);
+}
 
-static void change_notify_remove(struct change_notify *cnbp)
+NTSTATUS change_notify_create(struct files_struct *fsp, uint32 filter,
+                             BOOL recursive)
 {
-       cnotify->remove_notify(cnbp->change_data);
-       DLIST_REMOVE(change_notify_list, cnbp);
-       ZERO_STRUCTP(cnbp);
-       SAFE_FREE(cnbp);
+       char *fullpath;
+       struct notify_entry e;
+       NTSTATUS status;
+
+       SMB_ASSERT(fsp->notify == NULL);
+
+       if (!(fsp->notify = TALLOC_ZERO_P(NULL, struct notify_change_buf))) {
+               DEBUG(0, ("talloc failed\n"));
+               return NT_STATUS_NO_MEMORY;
+       }
+
+       if (asprintf(&fullpath, "%s/%s", fsp->conn->connectpath,
+                    fsp->fsp_name) == -1) {
+               DEBUG(0, ("asprintf failed\n"));
+               return NT_STATUS_NO_MEMORY;
+       }
+
+       e.path = fullpath;
+       e.filter = filter;
+       e.subdir_filter = 0;
+       if (recursive) {
+               e.subdir_filter = filter;
+       }
+
+       status = notify_add(fsp->conn->notify_ctx, &e, notify_callback, fsp);
+       SAFE_FREE(fullpath);
+
+       return status;
 }
 
-NTSTATUS change_notify_add_request(const char *inbuf, uint32 max_param_count,
+NTSTATUS change_notify_add_request(const char *inbuf, 
+                                  uint32 filter, BOOL recursive,
                                   struct files_struct *fsp)
 {
        struct notify_change_request *request = NULL;
@@ -186,8 +255,11 @@ NTSTATUS change_notify_add_request(const char *inbuf, uint32 max_param_count,
        map->req = request;
 
        memcpy(request->request_buf, inbuf, sizeof(request->request_buf));
-       request->max_param_count = max_param_count;
+       request->current_bufsize = 0;
+       request->filter = filter;
        request->fsp = fsp;
+       request->backend_data = NULL;
+       
        DLIST_ADD_END(fsp->notify->requests, request,
                      struct notify_change_request *);
 
@@ -218,11 +290,15 @@ static void change_notify_remove_request(struct notify_change_request *remove_re
                        break;
                }
        }
-       SMB_ASSERT(req != NULL);
+
+       if (req == NULL) {
+               smb_panic("notify_req not found in fsp's requests");
+       }
 
        DLIST_REMOVE(fsp->notify->requests, req);
        DLIST_REMOVE(notify_changes_by_mid, req->mid_map);
        SAFE_FREE(req->mid_map);
+       TALLOC_FREE(req->backend_data);
        SAFE_FREE(req);
 }
 
@@ -266,375 +342,163 @@ void remove_pending_change_notify_requests_by_fid(files_struct *fsp,
        }
 }
 
-/****************************************************************************
- Delete entries by filename and cnum from the change notify pending queue.
- Always send reply.
-*****************************************************************************/
-
-void remove_pending_change_notify_requests_by_filename(files_struct *fsp, NTSTATUS status)
-{
-       struct change_notify *cnbp, *next;
-
-       for (cnbp=change_notify_list; cnbp; cnbp=next) {
-               next=cnbp->next;
-               /*
-                * We know it refers to the same directory if the connection number and
-                * the filename are identical.
-                */
-               if((cnbp->fsp->conn == fsp->conn) && strequal(cnbp->fsp->fsp_name,fsp->fsp_name)) {
-                       change_notify_reply_packet(cnbp->request_buf, status);
-                       change_notify_remove(cnbp);
-               }
-       }
-}
-
-/****************************************************************************
- Set the current change notify timeout to the lowest value across all service
- values.
-****************************************************************************/
-
-void set_change_notify_timeout(int val)
+void notify_fname(connection_struct *conn, uint32 action, uint32 filter,
+                 const char *path)
 {
-       if (val > 0) {
-               cnotify->select_time = MIN(cnotify->select_time, val);
-       }
-}
-
-/****************************************************************************
- Longest time to sleep for before doing a change notify scan.
-****************************************************************************/
-
-int change_notify_timeout(void)
-{
-       return cnotify->select_time;
-}
-
-/****************************************************************************
- Process the change notify queue. Note that this is only called as root.
- Returns True if there are still outstanding change notify requests on the
- queue.
-*****************************************************************************/
-
-BOOL process_pending_change_notify_queue(time_t t)
-{
-       struct change_notify *cnbp, *next;
-       uint16 vuid;
-
-       for (cnbp=change_notify_list; cnbp; cnbp=next) {
-               next=cnbp->next;
-
-               vuid = (lp_security() == SEC_SHARE) ? UID_FIELD_INVALID : SVAL(cnbp->request_buf,smb_uid);
-
-               if (cnbp->fsp->notify->num_changes != 0) {
-                       DEBUG(10,("process_pending_change_notify_queue: %s "
-                                 "has %d changes!\n", cnbp->fsp->fsp_name,
-                                 cnbp->fsp->notify->num_changes));
-                       change_notify_reply(cnbp->request_buf,
-                                           cnbp->max_param_count,
-                                           cnbp->fsp->notify->num_changes,
-                                           cnbp->fsp->notify->changes);
-                       change_notify_remove(cnbp);
-                       continue;
-               }
+       char *fullpath;
 
-               if (cnotify->check_notify(cnbp->fsp->conn, vuid,
-                                         cnbp->fsp->fsp_name, cnbp->flags,
-                                         cnbp->change_data, t)) {
-                       DEBUG(10,("process_pending_change_notify_queue: dir "
-                                 "%s changed !\n", cnbp->fsp->fsp_name ));
-                       change_notify_reply(cnbp->request_buf,
-                                           cnbp->max_param_count,
-                                           cnbp->fsp->notify->num_changes,
-                                           cnbp->fsp->notify->changes);
-                       change_notify_remove(cnbp);
-               }
-       }
-
-       return (change_notify_list != NULL);
-}
-
-/****************************************************************************
- Now queue an entry on the notify change list.
- We only need to save smb_size bytes from this incoming packet
- as we will always by returning a 'read the directory yourself'
- error.
-****************************************************************************/
-
-BOOL change_notify_set(char *inbuf, files_struct *fsp, connection_struct *conn,
-                      uint32 flags, uint32 max_param_count)
-{
-       struct change_notify *cnbp;
-
-       if((cnbp = SMB_MALLOC_P(struct change_notify)) == NULL) {
-               DEBUG(0,("change_notify_set: malloc fail !\n" ));
-               return False;
-       }
-
-       ZERO_STRUCTP(cnbp);
-
-       memcpy(cnbp->request_buf, inbuf, smb_size);
-       cnbp->fsp = fsp;
-       cnbp->flags = flags;
-       cnbp->max_param_count = max_param_count;
-       cnbp->change_data = cnotify->register_notify(conn, fsp->fsp_name,
-                                                    flags);
-       
-       if (!cnbp->change_data) {
-               SAFE_FREE(cnbp);
-               return False;
-       }
-
-       DLIST_ADD(change_notify_list, cnbp);
-
-       /* Push the MID of this packet on the signing queue. */
-       srv_defer_sign_response(SVAL(inbuf,smb_mid));
-
-       return True;
-}
-
-int change_notify_fd(void)
-{
-       if (cnotify) {
-               return cnotify->notification_fd;
+       if (asprintf(&fullpath, "%s/%s", conn->connectpath, path) == -1) {
+               DEBUG(0, ("asprintf failed\n"));
+               return;
        }
 
-       return -1;
+       notify_trigger(conn->notify_ctx, action, filter, fullpath);
+       SAFE_FREE(fullpath);
 }
 
-/* notify message definition
-
-Offset  Data                   length.
-0      SMB_DEV_T dev           8
-8      SMB_INO_T inode         8
-16     uint32 action           4
-20..   name
-*/
-
-#define MSG_NOTIFY_MESSAGE_SIZE 21 /* Includes at least the '\0' terminator */
-
-struct notify_message {
-       SMB_DEV_T dev;
-       SMB_INO_T inode;
-       uint32_t action;
-       char *name;
-};
-
-static DATA_BLOB notify_message_to_buf(const struct notify_message *msg)
+static void notify_fsp(files_struct *fsp, uint32 action, const char *name)
 {
-       DATA_BLOB result;
-       size_t len;
-
-       len = strlen(msg->name);
-
-       result = data_blob(NULL, MSG_NOTIFY_MESSAGE_SIZE + len);
-       if (!result.data) {
-               return result;
-       }
-
-       SDEV_T_VAL(result.data, 0, msg->dev);
-       SINO_T_VAL(result.data, 8, msg->inode);
-       SIVAL(result.data, 16, msg->action);
-       memcpy(result.data+20, msg->name, len+1);
-
-       return result;
-}
+       struct notify_change *change, *changes;
+       char *tmp;
 
-static BOOL buf_to_notify_message(void *buf, size_t len,
-                                 struct notify_message *msg)
-{
-       if (len < MSG_NOTIFY_MESSAGE_SIZE) {
-               DEBUG(0, ("Got invalid notify message of len %d\n",
-                         (int)len));
-               return False;
+       if (fsp->notify == NULL) {
+               /*
+                * Nobody is waiting, don't queue
+                */
+               return;
        }
 
-       msg->dev     = DEV_T_VAL(buf, 0);
-       msg->inode   = INO_T_VAL(buf, 8);
-       msg->action  = IVAL(buf, 16);
-       msg->name    = ((char *)buf)+20;
-       return True;
-}
-
-void notify_action(connection_struct *conn, const char *parent,
-                  const char *name, uint32_t action)
-{
-       struct share_mode_lock *lck;
-       SMB_STRUCT_STAT sbuf;
-       int i;
-       struct notify_message msg;
-       DATA_BLOB blob;
-
-       struct process_id *pids;
-       int num_pids;
-
-       DEBUG(10, ("notify_action: parent=%s, name=%s, action=%u\n",
-                  parent, name, (unsigned)action));
+       /*
+        * Someone has triggered a notify previously, queue the change for
+        * later.
+        */
 
-       if (SMB_VFS_STAT(conn, parent, &sbuf) != 0) {
+       if ((fsp->notify->num_changes > 1000) || (name == NULL)) {
                /*
-                * Not 100% critical, ignore failure
+                * The real number depends on the client buf, just provide a
+                * guard against a DoS here.
                 */
+               TALLOC_FREE(fsp->notify->changes);
+               fsp->notify->num_changes = -1;
                return;
        }
 
-       if (!(lck = get_share_mode_lock(NULL, sbuf.st_dev, sbuf.st_ino,
-                                       NULL, NULL))) {
+       if (fsp->notify->num_changes == -1) {
                return;
        }
 
-       msg.dev = sbuf.st_dev;
-       msg.inode = sbuf.st_ino;
-       msg.action = action;
-       msg.name = CONST_DISCARD(char *, name);
-
-       blob = notify_message_to_buf(&msg);
-       if (blob.data == NULL) {
-               DEBUG(0, ("notify_message_to_buf failed\n"));
+       if (!(changes = TALLOC_REALLOC_ARRAY(
+                     fsp->notify, fsp->notify->changes,
+                     struct notify_change, fsp->notify->num_changes+1))) {
+               DEBUG(0, ("talloc_realloc failed\n"));
                return;
        }
 
-       pids = NULL;
-       num_pids = 0;
-
-       become_root_uid_only();
-
-       for (i=0; i<lck->num_share_modes; i++) {
-               struct share_mode_entry *e = &lck->share_modes[i];
-               int j;
-               struct process_id *tmp;
-
-               for (j=0; j<num_pids; j++) {
-                       if (procid_equal(&e->pid, &pids[j])) {
-                               break;
-                       }
-               }
-
-               if (j < num_pids) {
-                       /*
-                        * Already sent to that process, skip it
-                        */
-                       continue;
-               }
+       fsp->notify->changes = changes;
 
-               message_send_pid(lck->share_modes[i].pid, MSG_SMB_NOTIFY,
-                                blob.data, blob.length, True);
+       change = &(fsp->notify->changes[fsp->notify->num_changes]);
 
-               if (!(tmp = TALLOC_REALLOC_ARRAY(lck, pids, struct process_id,
-                                                num_pids+1))) {
-                       DEBUG(0, ("realloc failed\n"));
-                       break;
-               }
-               pids = tmp;
-               pids[num_pids] = e->pid;
-               num_pids += 1;
+       if (!(tmp = talloc_strdup(changes, name))) {
+               DEBUG(0, ("talloc_strdup failed\n"));
+               return;
        }
 
-       unbecome_root_uid_only();
+       string_replace(tmp, '/', '\\');
+       change->name = tmp;     
 
-       data_blob_free(&blob);
-       TALLOC_FREE(lck);
-}
-
-static void notify_fsp(files_struct *fsp, struct notify_message *msg)
-{
-       struct notify_change *change, *changes;
+       change->action = action;
+       fsp->notify->num_changes += 1;
 
-       if (fsp->notify == NULL) {
+       if (fsp->notify->requests == NULL) {
                /*
-                * Nobody is waiting, don't queue
+                * Nobody is waiting, so don't send anything. The ot
                 */
                return;
        }
 
-       if (fsp->notify->requests != NULL) {
+       if (action == NOTIFY_ACTION_OLD_NAME) {
                /*
-                * Someone is waiting for the change, trigger the reply
-                * immediately
+                * We have to send the two rename events in one reply. So hold
+                * the first part back.
                 */
-
-               struct notify_change_request *req = fsp->notify->requests;
-               struct notify_change onechange;
-
-               onechange.action = msg->action;
-               onechange.name = msg->name;
-
-               change_notify_reply(req->request_buf, req->max_param_count,
-                                   1, &onechange);
-
-               DLIST_REMOVE(fsp->notify->requests, req);
-               SAFE_FREE(req);
                return;
        }
 
        /*
-        * Someone has triggered a notify previously, queue the change for
-        * later. TODO: Limit the number of changes queued.
+        * Someone is waiting for the change, trigger the reply immediately.
+        *
+        * TODO: do we have to walk the lists of requests pending?
         */
 
-       if (!(changes = TALLOC_REALLOC_ARRAY(
-                     fsp->notify, fsp->notify->changes,
-                     struct notify_change, fsp->notify->num_changes+1))) {
-               DEBUG(0, ("talloc_realloc failed\n"));
-               return;
-       }
-
-       fsp->notify->changes = changes;
-
-       change = &(fsp->notify->changes[fsp->notify->num_changes]);
+       change_notify_reply(fsp->notify->requests->request_buf,
+                           fsp->notify);
 
-       if (!(change->name = talloc_strdup(changes, msg->name))) {
-               DEBUG(0, ("talloc_strdup failed\n"));
-               return;
-       }
-       change->action = msg->action;
-       fsp->notify->num_changes += 1;
+       change_notify_remove_request(fsp->notify->requests);
+}
 
-       return;
+char *notify_filter_string(TALLOC_CTX *mem_ctx, uint32 filter)
+{
+       char *result = NULL;
+
+       result = talloc_strdup(mem_ctx, "");
+
+       if (filter & FILE_NOTIFY_CHANGE_FILE_NAME)
+               result = talloc_asprintf_append(result, "FILE_NAME|");
+       if (filter & FILE_NOTIFY_CHANGE_DIR_NAME)
+               result = talloc_asprintf_append(result, "DIR_NAME|");
+       if (filter & FILE_NOTIFY_CHANGE_ATTRIBUTES)
+               result = talloc_asprintf_append(result, "ATTRIBUTES|");
+       if (filter & FILE_NOTIFY_CHANGE_SIZE)
+               result = talloc_asprintf_append(result, "SIZE|");
+       if (filter & FILE_NOTIFY_CHANGE_LAST_WRITE)
+               result = talloc_asprintf_append(result, "LAST_WRITE|");
+       if (filter & FILE_NOTIFY_CHANGE_LAST_ACCESS)
+               result = talloc_asprintf_append(result, "LAST_ACCESS|");
+       if (filter & FILE_NOTIFY_CHANGE_CREATION)
+               result = talloc_asprintf_append(result, "CREATION|");
+       if (filter & FILE_NOTIFY_CHANGE_EA)
+               result = talloc_asprintf_append(result, "EA|");
+       if (filter & FILE_NOTIFY_CHANGE_SECURITY)
+               result = talloc_asprintf_append(result, "SECURITY|");
+       if (filter & FILE_NOTIFY_CHANGE_STREAM_NAME)
+               result = talloc_asprintf_append(result, "STREAM_NAME|");
+       if (filter & FILE_NOTIFY_CHANGE_STREAM_SIZE)
+               result = talloc_asprintf_append(result, "STREAM_SIZE|");
+       if (filter & FILE_NOTIFY_CHANGE_STREAM_WRITE)
+               result = talloc_asprintf_append(result, "STREAM_WRITE|");
+
+       if (result == NULL) return NULL;
+       if (*result == '\0') return result;
+
+       result[strlen(result)-1] = '\0';
+       return result;
 }
 
-static void notify_message_callback(int msgtype, struct process_id pid,
-                                   void *buf, size_t len)
+struct sys_notify_context *sys_notify_context_create(connection_struct *conn,
+                                                    TALLOC_CTX *mem_ctx, 
+                                                    struct event_context *ev)
 {
-       struct notify_message msg;
-       files_struct *fsp;
+       struct sys_notify_context *ctx;
 
-       if (!buf_to_notify_message(buf, len, &msg)) {
-               return;
+       if (!(ctx = TALLOC_P(mem_ctx, struct sys_notify_context))) {
+               DEBUG(0, ("talloc failed\n"));
+               return NULL;
        }
 
-       DEBUG(10, ("Received notify_message for 0x%x/%.0f: %d\n",
-                  (unsigned)msg.dev, (double)msg.inode, msg.action));
-
-       for(fsp = fsp_find_di_first(msg.dev, msg.inode); fsp;
-           fsp = fsp_find_di_next(fsp)) {
-               notify_fsp(fsp, &msg);
-       }
+       ctx->ev = ev;
+       ctx->conn = conn;
+       ctx->private_data = NULL;
+       return ctx;
 }
 
-/****************************************************************************
- Initialise the change notify subsystem.
-****************************************************************************/
-
-BOOL init_change_notify(void)
+NTSTATUS sys_notify_watch(struct sys_notify_context *ctx,
+                         struct notify_entry *e,
+                         void (*callback)(struct sys_notify_context *ctx, 
+                                          void *private_data,
+                                          struct notify_event *ev),
+                         void *private_data, void *handle)
 {
-       cnotify = NULL;
-
-#if HAVE_KERNEL_CHANGE_NOTIFY
-       if (cnotify == NULL && lp_kernel_change_notify())
-               cnotify = kernel_notify_init();
-#endif
-#if HAVE_FAM_CHANGE_NOTIFY
-       if (cnotify == NULL && lp_fam_change_notify())
-               cnotify = fam_notify_init();
-#endif
-       if (!cnotify) cnotify = hash_notify_init();
-       
-       if (!cnotify) {
-               DEBUG(0,("Failed to init change notify system\n"));
-               return False;
-       }
-
-       message_register(MSG_SMB_NOTIFY, notify_message_callback);
-
-       return True;
+       return SMB_VFS_NOTIFY_WATCH(ctx->conn, ctx, e, callback, private_data,
+                                   handle);
 }
+