New directory tmpfs, in-core filesystem based on libdiskfs

1 files changed, 89 insertions, 0 deletions

diff --git a/tmpfs/tmpfs.h b/tmpfs/tmpfs.h
new file mode 100644
index 00000000..19f05de5
--- /dev/null
+++ b/tmpfs/tmpfs.h
@@ -0,0 +1,89 @@
+/* Private data structures for tmpfs.
+   Copyright (C) 2000 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.  */
+
+#ifndef _tmpfs_h
+#define _tmpfs_h 1
+
+#include <hurd/diskfs.h>
+#include <sys/types.h>
+#include <dirent.h>
+#include <stdint.h>
+
+struct disknode
+{
+  uint_fast8_t type;		/* DT_REG et al */
+
+  unsigned int gen;
+  off_t size;
+  mode_t mode;
+  nlink_t nlink;
+  uid_t uid, author;
+  gid_t gid;
+  time_t atime, mtime, ctime;
+  unsigned int flags;
+
+  char *trans;
+  size_t translen;
+
+  union
+  {
+    char *lnk;			/* malloc'd symlink target */
+    struct
+    {
+      mach_port_t memobj;
+      unsigned int allocpages;	/* largest size while memobj was live */
+    } reg;
+    struct
+    {
+      mach_port_t memobj;
+      unsigned int allocpages;	/* largest size while memobj was live */
+    };
+    struct
+    {
+      struct tmpfs_dirent *entries;
+      struct disknode *dotdot;
+    } dir;
+    dev_t chr, blk;
+  } u;
+
+  struct node *hnext, **hprevp;
+};
+
+struct tmpfs_dirent
+{
+  struct tmpfs_dirent *next;
+  struct disknode *dn;
+  uint8_t namelen;
+  char name[0];
+};
+
+extern unsigned int num_files;
+extern off_t tmpfs_page_limit, tmpfs_space_used;
+
+extern mach_port_t default_pager;
+
+static inline void
+adjust_used (off_t change)
+{
+  spin_lock (&diskfs_node_refcnt_lock);
+  tmpfs_space_used += change;
+  spin_unlock (&diskfs_node_refcnt_lock);
+}
+
+#endif