Initial revision

1 files changed, 80 insertions, 0 deletions

diff --git a/ext2fs/pokel.c b/ext2fs/pokel.c
new file mode 100644
index 00000000..6283d2f8
--- /dev/null
+++ b/ext2fs/pokel.c
@@ -0,0 +1,80 @@
+/* Remember where we've written the disk to speed up sync
+
+   Copyright (C) 1994, 1995 Free Software Foundation, Inc.
+
+   Written by Michael I. Bushnell.
+
+   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 this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include "ext2fs.h"
+
+void pokes_init (struct pokes *pokes)
+{
+  pokes->lock = SPIN_LOCK_INITIALIZER;
+  pokes->pokes = NULL;
+}
+
+/* Remember that data here on the disk has been modified. */
+void
+pokes_record (struct pokes, void *loc, vm_size_t length)
+{
+  struct poke *pl;
+  vm_offset_t offset;
+  
+  offset = loc - disk_image;
+  offset = trunc_page (offset);
+  length = round_page (offset + length) - offset;
+
+  spin_lock (&pokes->lock);
+
+  pl = pokes->pokes;
+  if (pl == NULL || pl->offset != offset || pl->length == length)
+    {
+      pl = pokes->free_pokes;
+      if (pl == NULL)
+	pl = malloc (sizeof (struct poke));
+      else
+	pokes->free_pokes = pl->next;
+      pl->offset = offset;
+      pl->length = length;
+      pl->next = pokes->pokes;
+      pokes->pokes = pl;
+    }
+
+  spin_lock (&pokelistlock);
+}
+
+/* Sync all the modified pieces of disk */
+void
+pokes_sync (struct pokes *pokes, int wait)
+{
+  struct poke *pl, *next;
+  
+  spin_lock (&pokes->lock);
+
+  for (pl = pokes->pokes; pl; pl = next)
+    {
+      pager_sync_some (diskpager->p, pl->offset, pl->length, wait);
+      next = pl->next;
+      pl->next = pokes->free_pokes;
+      pokes->free_pokes = pl;
+    }
+  pokes->pokes = NULL;
+
+  spin_unlock (&pokes->lock);
+}
+