smbd: some write time fixes
[tprouty/samba.git] / source / smbd / fileio.c
index 8037510d8058b8240e5ac497b3beba6cbed83b51..095841825a5e34ef2132a15741e320fc7e796c07 100644 (file)
@@ -77,7 +77,7 @@ ssize_t read_file(files_struct *fsp,char *data,SMB_OFF_T pos,size_t n)
 #ifdef DMF_FIX
                int numretries = 3;
 tryagain:
-               readret = SMB_VFS_PREAD(fsp,fsp->fh->fd,data,n,pos);
+               readret = SMB_VFS_PREAD(fsp,data,n,pos);
 
                if (readret == -1) {
                        if ((errno == EAGAIN) && numretries) {
@@ -89,7 +89,7 @@ tryagain:
                        return -1;
                }
 #else /* NO DMF fix. */
-               readret = SMB_VFS_PREAD(fsp,fsp->fh->fd,data,n,pos);
+               readret = SMB_VFS_PREAD(fsp,data,n,pos);
 
                if (readret == -1) {
                        return -1;
@@ -142,27 +142,6 @@ static ssize_t real_write_file(struct smb_request *req,
        if (ret != -1) {
                fsp->fh->pos += ret;
 
-               /*
-                * It turns out that setting the last write time from a Windows
-                * client stops any subsequent writes from updating the write time.
-                * Doing this after the write gives a race condition here where
-                * a stat may see the changed write time before we reset it here,
-                * but it's cheaper than having to store the write time in shared
-                * memory and look it up using dev/inode across all running smbd's.
-                * The 99% solution will hopefully be good enough in this case. JRA.
-                */
-
-               if (!null_timespec(fsp->pending_modtime)) {
-                       set_filetime(fsp->conn, fsp->fsp_name,
-                                       fsp->pending_modtime);
-
-                       /* If we didn't get the "set modtime" call ourselves, we must
-                          store the last write time to restore on close. JRA. */
-                       if (!fsp->pending_modtime_owner) {
-                               fsp->last_write_time = timespec_current();
-                       }
-               }
-
 /* Yes - this is correct - writes don't update this. JRA. */
 /* Found by Samba4 tests. */
 #if 0
@@ -184,7 +163,7 @@ static int wcp_file_size_change(files_struct *fsp)
        write_cache *wcp = fsp->wcp;
 
        wcp->file_size = wcp->offset + wcp->data_size;
-       ret = SMB_VFS_FTRUNCATE(fsp, fsp->fh->fd, wcp->file_size);
+       ret = SMB_VFS_FTRUNCATE(fsp, wcp->file_size);
        if (ret == -1) {
                DEBUG(0,("wcp_file_size_change (%s): ftruncate of size %.0f error %s\n",
                        fsp->fsp_name, (double)wcp->file_size, strerror(errno) ));
@@ -192,6 +171,77 @@ static int wcp_file_size_change(files_struct *fsp)
        return ret;
 }
 
+static void update_write_time_handler(struct event_context *ctx,
+                                     struct timed_event *te,
+                                     const struct timeval *now,
+                                     void *private_data)
+{
+       files_struct *fsp = (files_struct *)private_data;
+
+       /* Remove the timed event handler. */
+       TALLOC_FREE(fsp->update_write_time_event);
+       DEBUG(5, ("Update write time on %s\n", fsp->fsp_name));
+
+       /* change the write time if not already changed by someone else */
+       update_write_time(fsp);
+}
+
+/*********************************************************
+ Schedule a write time update for WRITE_TIME_UPDATE_USEC_DELAY
+ in the future.
+*********************************************************/
+
+void trigger_write_time_update(struct files_struct *fsp)
+{
+       int delay;
+
+       if (fsp->write_time_forced) {
+               /* No point - "sticky" write times
+                * in effect.
+                */
+               return;
+       }
+
+       if (fsp->update_write_time_triggered) {
+               /*
+                * No point - an event is already scheduled.
+                */
+               return;
+       }
+       fsp->update_write_time_triggered = true;
+
+       delay = lp_parm_int(SNUM(fsp->conn),
+                           "smbd", "writetimeupdatedelay",
+                           WRITE_TIME_UPDATE_USEC_DELAY);
+
+       /* trigger the update 2 seconds later */
+       fsp->update_write_time_on_close = true;
+       fsp->update_write_time_event =
+               event_add_timed(smbd_event_context(), NULL,
+                               timeval_current_ofs(0, delay),
+                               "update_write_time_handler",
+                               update_write_time_handler, fsp);
+}
+
+void trigger_write_time_update_immediate(struct files_struct *fsp)
+{
+        if (fsp->write_time_forced) {
+               /*
+                * No point - "sticky" write times
+                * in effect.
+                */
+                return;
+        }
+
+       TALLOC_FREE(fsp->update_write_time_event);
+       DEBUG(5, ("Update write time immediate on %s\n", fsp->fsp_name));
+
+       fsp->update_write_time_triggered = true;
+
+        fsp->update_write_time_on_close = false;
+       update_write_time(fsp);
+}
+
 /****************************************************************************
  Write to a file.
 ****************************************************************************/
@@ -229,8 +279,10 @@ ssize_t write_file(struct smb_request *req,
                SMB_STRUCT_STAT st;
                fsp->modified = True;
 
-               if (SMB_VFS_FSTAT(fsp,fsp->fh->fd,&st) == 0) {
-                       int dosmode = dos_mode(fsp->conn,fsp->fsp_name,&st);
+               if (SMB_VFS_FSTAT(fsp, &st) == 0) {
+                       int dosmode;
+                       trigger_write_time_update(fsp);
+                       dosmode = dos_mode(fsp->conn,fsp->fsp_name,&st);
                        if ((lp_store_dos_attributes(SNUM(fsp->conn)) ||
                                        MAP_ARCHIVE(fsp->conn)) &&
                                        !IS_DOS_ARCHIVE(dosmode)) {
@@ -879,7 +931,7 @@ NTSTATUS sync_file(connection_struct *conn, files_struct *fsp, bool write_throug
                if (ret == -1) {
                        return map_nt_error_from_unix(errno);
                }
-               ret = SMB_VFS_FSYNC(fsp,fsp->fh->fd);
+               ret = SMB_VFS_FSYNC(fsp);
                if (ret == -1) {
                        return map_nt_error_from_unix(errno);
                }
@@ -896,6 +948,6 @@ int fsp_stat(files_struct *fsp, SMB_STRUCT_STAT *pst)
        if (fsp->fh->fd == -1) {
                return SMB_VFS_STAT(fsp->conn, fsp->fsp_name, pst);
        } else {
-               return SMB_VFS_FSTAT(fsp,fsp->fh->fd, pst);
+               return SMB_VFS_FSTAT(fsp, pst);
        }
 }