Added base version of file system infrastructure. This includes a major

overhaul of the RTEMS system call interface.  This base file system is
the "In-Memory File System" aka IMFS.

The design and implementation was done by the following people:

  + Joel Sherrill (joel@OARcorp.com)
  + Jennifer Averett (jennifer@OARcorp.com)
  + Steve "Mr Mount" Salitasc (salitasc@OARcorp.com)
  + Kerwin Wade (wade@OARcorp.com)

PROBLEMS
========
  + It is VERY likely that merging this will break the UNIX port.  This
    can/will be fixed.

  + There is likely some reentrancy/mutual exclusion needed.

  + Eventually, there should be a "mini-IMFS" description table to
    eliminate links, symlinks, etc to save memory.  All you need to
    have "classic RTEMS" functionality is technically directories
    and device IO.  All the rest could be left out to save memory.

1 files changed, 160 insertions, 0 deletions

diff --git a/cpukit/libfs/src/imfs/imfs_debug.c b/cpukit/libfs/src/imfs/imfs_debug.c
new file mode 100644
index 0000000000..856f21317e
--- /dev/null
+++ b/cpukit/libfs/src/imfs/imfs_debug.c
@@ -0,0 +1,160 @@
+/*
+ *  IMFS debug support routines
+ *
+ *  COPYRIGHT (c) 1989-1998.
+ *  On-Line Applications Research Corporation (OAR).
+ *  Copyright assigned to U.S. Government, 1994.
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.OARcorp.com/rtems/license.html.
+ *
+ *  $Id$
+ */
+
+#include <assert.h>
+#include <string.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>   /* for close */
+
+#include <stdio.h>
+#include <sys/stat.h>
+
+#include "imfs.h"
+#include "libio_.h"
+
+/*
+ *  IMFS_types
+ *
+ *  Printable names for each of the IMFS file system types.
+ */
+ 
+char *IMFS_types[ IMFS_NUMBER_OF_TYPES ] = {
+  "directory",
+  "device",
+  "link",
+  "memory file"
+};
+
+/*
+ *  IMFS_print_jnode
+ *
+ *  This routine prints the contents of the specified jnode.
+ */
+
+void IMFS_print_jnode( 
+  IMFS_jnode_t *the_jnode
+)
+{
+  assert( the_jnode );
+
+  printf( "%s", the_jnode->name );
+  switch( the_jnode->type ) {
+    case IMFS_DIRECTORY:
+      printf( "/" );
+      break;
+
+    case IMFS_DEVICE:
+      printf( " (device %d, %d)",
+        the_jnode->info.device.major, the_jnode->info.device.minor );
+      break;
+
+    case IMFS_MEMORY_FILE:
+      printf( " (file %d %p %p %p)",
+        (int)the_jnode->info.file.size,
+        the_jnode->info.file.indirect,
+        the_jnode->info.file.doubly_indirect,
+        the_jnode->info.file.triply_indirect
+      );
+      break;
+
+    case IMFS_HARD_LINK:
+      printf( " links not printed\n" );
+      assert(0);
+      break;
+
+    case IMFS_SYM_LINK:
+      printf( " links not printed\n" );
+      assert(0);
+      break;
+
+    default:
+      printf( " bad type %d\n", the_jnode->type );
+      assert(0);
+      break;
+  }
+  puts("");
+}
+
+/*
+ *  IMFS_dump_directory
+ *
+ *  This routine prints the contents of a directory in the IMFS.  If a
+ *  directory is encountered, then this routine will recurse to process
+ *  the subdirectory.
+ */
+
+void IMFS_dump_directory(
+  IMFS_jnode_t  *the_directory,
+  int            level
+)
+{
+  Chain_Node           *the_node;
+  Chain_Control        *the_chain;
+  IMFS_jnode_t         *the_jnode;
+  int                   i;
+
+  assert( the_directory );
+
+  assert( level >= 0 );
+
+  assert( the_directory->type == IMFS_DIRECTORY );
+
+  the_chain = &the_directory->info.directory.Entries;
+
+  for ( the_node = the_chain->first;
+        !_Chain_Is_tail( the_chain, the_node );
+        the_node = the_node->next ) {
+
+    the_jnode = (IMFS_jnode_t *) the_node;
+
+    for ( i=0 ; i<=level ; i++ )
+      printf( "    " );
+    IMFS_print_jnode( the_jnode );
+    if ( the_jnode->type == IMFS_DIRECTORY )
+      IMFS_dump_directory( the_jnode, level + 1 );
+  }
+}
+
+/*
+ *  IMFS_dump
+ *
+ *  This routine dumps the entire IMFS that is mounted at the root
+ *  directory.
+ *
+ *  NOTE: Assuming the "/" directory is bad.
+ *        Not checking that the starting directory is in an IMFS is bad.
+ */
+
+void IMFS_dump( void )
+{
+  printf( "*************** Dump of Entire IMFS ***************\n" );
+  printf( "/\n" );
+  IMFS_dump_directory( rtems_filesystem_root.node_access, 0 );
+  printf( "***************       End of Dump        ***************\n" );
+}
+
+/*
+ *  IMFS_memfile_maximum_size()
+ *
+ *  This routine returns the size of the largest file which can be created
+ *  using the IMFS memory file type.
+ *
+ */
+
+int IMFS_memfile_maximum_size( void )
+{
+  return IMFS_MEMFILE_MAXIMUM_SIZE;
+}