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, 13 insertions, 101 deletions

diff --git a/cpukit/libcsupport/src/libio.c b/cpukit/libcsupport/src/libio.c
index d080d01596..985ad8bad9 100644
--- a/cpukit/libcsupport/src/libio.c
+++ b/cpukit/libcsupport/src/libio.c
@@ -47,14 +47,14 @@
  *  Convert UNIX fnctl(2) flags to ones that RTEMS drivers understand
  */
 
-const rtems_assoc_t access_modes_assoc[] = {
+static const rtems_assoc_t access_modes_assoc[] = {
   { "READ",       LIBIO_FLAGS_READ,  O_RDONLY },
   { "WRITE",      LIBIO_FLAGS_WRITE, O_WRONLY },
   { "READ/WRITE", LIBIO_FLAGS_READ_WRITE, O_RDWR },
   { 0, 0, 0 },
 };
 
-const rtems_assoc_t status_flags_assoc[] = {
+static const rtems_assoc_t status_flags_assoc[] = {
 #ifdef ACCEPT_O_NDELAY_ALIAS
   { "NO DELAY",  LIBIO_FLAGS_NO_DELAY,  O_NDELAY },
 #endif
@@ -64,9 +64,7 @@ const rtems_assoc_t status_flags_assoc[] = {
   { 0, 0, 0 },
 };
 
-uint32_t   rtems_libio_fcntl_flags(
-  uint32_t   fcntl_flags
-)
+uint32_t rtems_libio_fcntl_flags( int fcntl_flags )
 {
   uint32_t   flags = 0;
   uint32_t   access_modes;
@@ -75,7 +73,7 @@ uint32_t   rtems_libio_fcntl_flags(
    * Access mode is a small integer
    */
 
-  access_modes = fcntl_flags & O_ACCMODE;
+  access_modes = (uint32_t) (fcntl_flags & O_ACCMODE);
   fcntl_flags &= ~O_ACCMODE;
   flags = rtems_assoc_local_by_remote( access_modes_assoc, access_modes );
 
@@ -83,8 +81,11 @@ uint32_t   rtems_libio_fcntl_flags(
    * Everything else is single bits
    */
 
-  flags |=
-     rtems_assoc_local_by_remote_bitfield(status_flags_assoc, fcntl_flags);
+  flags |= rtems_assoc_local_by_remote_bitfield(
+    status_flags_assoc,
+    (uint32_t) fcntl_flags
+  );
+
   return flags;
 }
 
@@ -94,11 +95,9 @@ uint32_t   rtems_libio_fcntl_flags(
  *  Convert RTEMS internal flags to UNIX fnctl(2) flags
  */
 
-uint32_t   rtems_libio_to_fcntl_flags(
-  uint32_t   flags
-)
+int rtems_libio_to_fcntl_flags( uint32_t flags )
 {
-  uint32_t   fcntl_flags = 0;
+  int fcntl_flags = 0;
 
   if ( (flags & LIBIO_FLAGS_READ_WRITE) == LIBIO_FLAGS_READ_WRITE ) {
     fcntl_flags |= O_RDWR;
@@ -176,6 +175,8 @@ void rtems_libio_free(
   rtems_libio_t *iop
 )
 {
+  rtems_filesystem_location_free( &iop->pathinfo );
+
   rtems_libio_lock();
 
     if (iop->sem)
@@ -187,92 +188,3 @@ void rtems_libio_free(
 
   rtems_libio_unlock();
 }
-
-/*
- *  rtems_libio_is_open_files_in_fs
- *
- *  This routine scans the entire file descriptor table to determine if the
- *  are any active file descriptors that refer to the at least one node in the
- *  file system that we are trying to dismount.
- *
- *  If there is at least one node in the file system referenced by the mount
- *  table entry a 1 is returned, otherwise a 0 is returned.
- */
-
-int rtems_libio_is_open_files_in_fs(
-  rtems_filesystem_mount_table_entry_t * fs_mt_entry
-)
-{
-  rtems_libio_t     *iop;
-  int                result = 0;
-  uint32_t           i;
-
-  rtems_libio_lock();
-
-  /*
-   *  Look for any active file descriptor entry.
-   */
-
-  for (iop=rtems_libio_iops,i=0; i < rtems_libio_number_iops; iop++, i++){
-
-    if ((iop->flags & LIBIO_FLAGS_OPEN) != 0) {
-
-       /*
-        *  Check if this node is under the file system that we
-        *  are trying to dismount.
-        */
-
-       if ( iop->pathinfo.mt_entry == fs_mt_entry ) {
-          result = 1;
-          break;
-       }
-    }
-  }
-
-  rtems_libio_unlock();
-
-  return result;
-}
-
-/*
- *  rtems_libio_is_file_open
- *
- *  This routine scans the entire file descriptor table to determine if the
- *  given file refers to an active file descriptor.
- *
- *  If the given file is open a 1 is returned, otherwise a 0 is returned.
- */
-
-int rtems_libio_is_file_open(
-  void         *node_access
-)
-{
-  rtems_libio_t     *iop;
-  int                result=0;
-  uint32_t           i;
-
-  rtems_libio_lock();
-
-  /*
-   *  Look for any active file descriptor entry.
-   */
-
- for (iop=rtems_libio_iops,i=0; i < rtems_libio_number_iops; iop++, i++){
-    if ((iop->flags & LIBIO_FLAGS_OPEN) != 0) {
-
-       /*
-        *  Check if this node is under the file system that we
-        *  are trying to dismount.
-        */
-
-       if ( iop->pathinfo.node_access == node_access ) {
-          result = 1;
-          break;
-       }
-    }
-  }
-
-  rtems_libio_unlock();
-
-  return result;
-}