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, 130 insertions, 0 deletions

diff --git a/c/src/lib/libc/imfs_creat.c b/c/src/lib/libc/imfs_creat.c
new file mode 100644
index 0000000000..fd38e7f993
--- /dev/null
+++ b/c/src/lib/libc/imfs_creat.c
@@ -0,0 +1,130 @@
+/*
+ *  IMFS_create_node()
+ *
+ *  Routine to create a new in memory file system node.
+ *
+ *  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 <stdlib.h>
+#include <string.h>
+#include "imfs.h"
+#include "libio_.h"
+
+IMFS_jnode_t *IMFS_create_node(
+  rtems_filesystem_location_info_t  *parent_loc,
+  IMFS_jnode_types_t                 type,
+  char                              *name,
+  mode_t                             mode,
+  IMFS_types_union                  *info
+)
+{
+  IMFS_jnode_t        *node;
+  struct timeval       tv;
+  IMFS_jnode_t        *parent = NULL;
+  IMFS_fs_info_t      *fs_info;
+  char                *sym_name;
+
+  if ( parent_loc != NULL )
+    parent = parent_loc->node_access;
+
+  /*
+   *  Allocate an IMFS jnode
+   */
+
+  node = calloc( 1, sizeof( IMFS_jnode_t ) );
+  if ( !node )
+    return NULL;
+
+  /*
+   *  Fill in the basic information
+   */
+
+  node->st_nlink = 1;
+  node->type     = type;
+  strncpy( node->name, name, NAME_MAX );
+
+  /*
+   *  Fill in the mode and permission information for the jnode structure.
+   */
+
+  node->st_mode = mode & ~rtems_filesystem_umask;
+  
+#if defined(RTEMS_POSIX_API)
+  node->st_uid = geteuid();
+  node->st_gid = getegid();
+#else
+  node->st_uid = 0;
+  node->st_gid = 0;
+#endif
+
+  /*
+   *  Now set all the times.
+   */
+
+  gettimeofday( &tv, 0 );
+
+  node->st_atime  = (time_t) tv.tv_sec;
+  node->st_mtime  = (time_t) tv.tv_sec;
+  node->st_ctime  = (time_t) tv.tv_sec;
+
+  /*
+   *  Set the type specific information
+   */
+
+  switch (type) {
+    case IMFS_DIRECTORY:
+      Chain_Initialize_empty(&node->info.directory.Entries);
+      break;
+
+    case IMFS_HARD_LINK:
+      node->info.hard_link.link_node = info->hard_link.link_node;
+      break;
+
+    case IMFS_SYM_LINK:
+      sym_name = calloc( 1, strlen( info->sym_link.name ) + 1 );
+      strcpy( sym_name, info->sym_link.name );
+      node->info.sym_link.name = sym_name;
+      break;
+
+    case IMFS_DEVICE:
+      node->info.device.major = info->device.major;
+      node->info.device.minor = info->device.minor;
+      break;
+
+    case IMFS_MEMORY_FILE:
+      node->info.file.size            = 0;
+      node->info.file.indirect        = 0;
+      node->info.file.doubly_indirect = 0;
+      node->info.file.triply_indirect = 0;
+      break;
+
+    default:
+      assert(0);
+      break;
+  }
+
+  /*
+   *  If this node has a parent, then put it in that directory list.
+   */
+
+  if ( parent ) {
+    Chain_Append( &parent->info.directory.Entries, &node->Node );
+    node->Parent = parent;
+
+    fs_info = parent_loc->mt_entry->fs_info;
+    node->st_ino = ++fs_info->ino_count;
+  }
+
+
+  return node;
+}