Filesystem: Reference counting for locations

 o A new data structure rtems_filesystem_global_location_t was
   introduced to be used for
    o the mount point location in the mount table entry,
    o the file system root location in the mount table entry,
    o the root directory location in the user environment, and
    o the current directory location in the user environment.
   During the path evaluation global start locations are obtained to
   ensure that the current file system instance will be not unmounted in
   the meantime.
 o The user environment uses now reference counting and is protected
   from concurrent access.
 o The path evaluation process was completely rewritten and simplified.
   The IMFS, RFS, NFS, and DOSFS use now a generic path evaluation
   method.  Recursive calls in the path evaluation have been replaced
   with iteration to avoid stack overflows.  Only the evaluation of
   symbolic links is recursive.  No dynamic memory allocations and
   intermediate buffers are used in the high level path evaluation.  No
   global locks are held during the file system instance specific path
   evaluation process.
 o Recursive symbolic link evaluation is now limited by
   RTEMS_FILESYSTEM_SYMLOOP_MAX.  Applications can retrieve this value
   via sysconf().
 o The device file system (devFS) uses now no global variables and
   allocation from the workspace.  Node names are allocated from the
   heap.
 o The upper layer lseek() performs now some parameter checks.
 o The upper layer ftruncate() performs now some parameter checks.
 o unmask() is now restricted to the RWX flags and protected from
   concurrent access.
 o The fchmod_h and rmnod_h file system node handlers are now a file
   system operation.
 o The unlink_h operation has been removed.  All nodes are now destroyed
   with the rmnod_h operation.
 o New lock_h, unlock_h, clonenod_h, and are_nodes_equal_h file system
   operations.
 o The path evaluation and file system operations are now protected by
   per file system instance lock and unlock operations.
 o Fix and test file descriptor duplicate in fcntl().
 o New test fstests/fsnofs01.

1 files changed, 18 insertions, 19 deletions

diff --git a/cpukit/sapi/include/confdefs.h b/cpukit/sapi/include/confdefs.h
index 89e6b5c094..8f03c876a9 100644
--- a/cpukit/sapi/include/confdefs.h
+++ b/cpukit/sapi/include/confdefs.h
@@ -428,9 +428,7 @@ rtems_fs_init_functions_t    rtems_fs_init_helper =
    *  the bsp overwrides this.  In which case the value is set
    *  to BSP_MAXIMUM_DEVICES.
    */
-  #if defined(CONFIGURE_APPLICATION_DISABLE_FILESYSTEM)
-    #define CONFIGURE_MEMORY_FOR_DEVFS  0
-  #elif defined(CONFIGURE_FILESYSTEM_DEVFS)
+  #ifdef CONFIGURE_FILESYSTEM_DEVFS
     #ifndef CONFIGURE_MAXIMUM_DEVICES
       #if defined(BSP_MAXIMUM_DEVICES)
         #define CONFIGURE_MAXIMUM_DEVICES BSP_MAXIMUM_DEVICES
@@ -439,12 +437,6 @@ rtems_fs_init_functions_t    rtems_fs_init_helper =
       #endif
     #endif
     #include <rtems/devfs.h>
-    uint32_t rtems_device_table_size = CONFIGURE_MAXIMUM_DEVICES;
-    #define CONFIGURE_MEMORY_FOR_DEVFS \
-      _Configure_Object_RAM(CONFIGURE_MAXIMUM_DEVICES, \
-         sizeof (rtems_device_name_t))
-  #else
-    #define CONFIGURE_MEMORY_FOR_DEVFS  0
   #endif
 
 #ifndef RTEMS_SCHEDSIM
@@ -503,23 +495,31 @@ rtems_fs_init_functions_t    rtems_fs_init_helper =
   #endif
 
   #ifndef CONFIGURE_HAS_OWN_MOUNT_TABLE
-    extern const rtems_filesystem_mount_table_t configuration_mount_table;
-    const rtems_filesystem_mount_table_t configuration_mount_table = {
+    #if defined(CONFIGURE_USE_DEVFS_AS_BASE_FILESYSTEM)
+      static devFS_node devFS_root_filesystem_nodes [CONFIGURE_MAXIMUM_DEVICES];
+      static const devFS_data devFS_root_filesystem_data = {
+        devFS_root_filesystem_nodes,
+        CONFIGURE_MAXIMUM_DEVICES
+      };
+    #endif
+    const rtems_filesystem_mount_configuration
+      rtems_filesystem_root_configuration = {
+      NULL,
+      NULL,
       #if defined(CONFIGURE_USE_DEVFS_AS_BASE_FILESYSTEM)
         RTEMS_FILESYSTEM_TYPE_DEVFS,
       #elif defined(CONFIGURE_USE_MINIIMFS_AS_BASE_FILESYSTEM)
         RTEMS_FILESYSTEM_TYPE_MINIIMFS,
-      #else  /* using IMFS as base filesystem */
+      #else
         RTEMS_FILESYSTEM_TYPE_IMFS,
       #endif
       RTEMS_FILESYSTEM_READ_WRITE,
-      NULL,
-      NULL
+      #if defined(CONFIGURE_USE_DEVFS_AS_BASE_FILESYSTEM)
+        &devFS_root_filesystem_data
+      #else
+        NULL
+      #endif
     };
-
-    const rtems_filesystem_mount_table_t
-        *rtems_filesystem_mount_table = &configuration_mount_table;
-    const int rtems_filesystem_mount_table_size = 1;
   #endif
 
 #endif
@@ -2020,7 +2020,6 @@ rtems_fs_init_functions_t    rtems_fs_init_helper =
 #define CONFIGURE_EXECUTIVE_RAM_SIZE \
 (( \
    CONFIGURE_MEMORY_FOR_SYSTEM_OVERHEAD + \
-   CONFIGURE_MEMORY_FOR_DEVFS + \
    CONFIGURE_MEMORY_FOR_TASKS( \
      CONFIGURE_TOTAL_TASKS_AND_THREADS, CONFIGURE_TOTAL_TASKS_AND_THREADS) + \
    CONFIGURE_MEMORY_FOR_CLASSIC + \