1 files changed, 104 insertions, 0 deletions
diff --git a/libdiskfs/shutdown.c b/libdiskfs/shutdown.c
new file mode 100644
index 00000000..1a544f5b
--- /dev/null
+++ b/libdiskfs/shutdown.c
@@ -0,0 +1,104 @@
+/*
+   Copyright (C) 1993, 94, 95, 96, 98, 99 Free Software Foundation, Inc.
+
+This file is part of the GNU Hurd.
+
+The GNU Hurd 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, or (at your option)
+any later version.
+
+The GNU Hurd 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 the GNU Hurd; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/* Written by Michael I. Bushnell.  */
+
+#include "priv.h"
+#include <hurd/fsys.h>
+
+struct rwlock diskfs_fsys_lock = RWLOCK_INITIALIZER;
+
+/* Shutdown the filesystem; flags are as for fsys_goaway. */
+error_t
+diskfs_shutdown (int flags)
+{
+  int nports = -1;
+  int err;
+
+  error_t
+    helper (struct node *np)
+      {
+	error_t error;
+	mach_port_t control;
+
+	error = fshelp_fetch_control (&np->transbox, &control);
+	mutex_unlock (&np->lock);
+	if (!error && (control != MACH_PORT_NULL))
+	  {
+	    error = fsys_goaway (control, flags);
+	    mach_port_deallocate (mach_task_self (), control);
+	  }
+	else
+	  error = 0;
+	mutex_lock (&np->lock);
+
+	if ((error == MIG_SERVER_DIED) || (error == MACH_SEND_INVALID_DEST))
+	  error = 0;
+
+	return error;
+      }
+
+  if ((flags & FSYS_GOAWAY_UNLINK)
+       && S_ISDIR (diskfs_root_node->dn_stat.st_mode))
+    return EBUSY;
+
+  if (flags & FSYS_GOAWAY_RECURSE)
+    {
+      err = diskfs_node_iterate (helper);
+      if (err)
+	return err;
+    }
+
+  rwlock_writer_lock (&diskfs_fsys_lock);
+
+  /* Permit all the current RPC's to finish, and then
+     suspend new ones.  */
+  err = ports_inhibit_class_rpcs (diskfs_protid_class);
+  if (err)
+    {
+      rwlock_writer_unlock (&diskfs_fsys_lock);
+      return err;
+    }
+
+  /* Write everything out and set "clean" state.  Even if we don't in fact
+     shut down now, this has the nice effect that a disk that has not been
+     written for a long time will not need checking after a crash.  */
+  diskfs_sync_everything (1);
+  diskfs_set_hypermetadata (1, 1);
+  _diskfs_diskdirty = 0;
+
+  /* First, see if there are outstanding user ports. */
+  nports = ports_count_class (diskfs_protid_class);
+  if (((flags & FSYS_GOAWAY_FORCE) == 0)
+      && (nports || diskfs_pager_users ()))
+    {
+      ports_enable_class (diskfs_protid_class);
+      ports_resume_class_rpcs (diskfs_protid_class);
+      rwlock_writer_unlock (&diskfs_fsys_lock);
+      return EBUSY;
+    }
+
+  if (!diskfs_readonly && (flags & FSYS_GOAWAY_NOSYNC) == 0)
+    {
+      diskfs_shutdown_pager ();
+      diskfs_set_hypermetadata (1, 1);
+    }
+
+  return 0;
+}