source: rtems/cpukit/libcsupport/src/unmount.c @ da154e14

4.11
Last change on this file since da154e14 was da154e14, checked in by Sebastian Huber <sebastian.huber@…>, on May 14, 2012 at 2:55:41 PM

Filesystem: Move operations to mount table entry

The scope of the file system operations is the file system instance.
The scope of the file system node handlers is the file location. The
benefit of moving the operations to the mount table entry is a size
reduction of the file location (rtems_filesystem_location_info_t). The
code size is slightly increased due to additional load instructions.

Restructure rtems_filesystem_mount_table_entry_t to improve cache
efficiency.

  • Property mode set to 100644
File size: 1.5 KB
Line 
1/*
2 *  unmount() - Unmount a File System
3 *
4 *  This routine is not defined in the POSIX 1003.1b standard but
5 *  in some form is supported on most UNIX and POSIX systems.  This
6 *  routine is necessary to mount instantiations of a file system
7 *  into the file system name space.
8 *
9 *  COPYRIGHT (c) 1989-2010.
10 *  On-Line Applications Research Corporation (OAR).
11 *
12 *  The license and distribution terms for this file may be
13 *  found in the file LICENSE in this distribution or at
14 *  http://www.rtems.com/license/LICENSE.
15 */
16
17#if HAVE_CONFIG_H
18  #include "config.h"
19#endif
20
21#include <errno.h>
22
23#include <rtems/libio_.h>
24
25int unmount( const char *path )
26{
27  int rv = 0;
28  rtems_filesystem_eval_path_context_t ctx;
29  int eval_flags = RTEMS_FS_FOLLOW_LINK;
30  const rtems_filesystem_location_info_t *currentloc =
31    rtems_filesystem_eval_path_start( &ctx, path, eval_flags );
32  rtems_filesystem_mount_table_entry_t *mt_entry = currentloc->mt_entry;
33
34  if ( rtems_filesystem_location_is_root( currentloc ) ) {
35    const rtems_filesystem_operations_table *mt_point_ops =
36      mt_entry->mt_point_node->location.mt_entry->ops;
37
38    rv = (*mt_point_ops->unmount_h)( mt_entry );
39    if ( rv == 0 ) {
40      rtems_filesystem_mt_entry_declare_lock_context( lock_context );
41
42      rtems_filesystem_mt_entry_lock( lock_context );
43      mt_entry->mounted = false;
44      rtems_filesystem_mt_entry_unlock( lock_context );
45    }
46  } else {
47    errno = EACCES;
48    rv = -1;
49  }
50
51  rtems_filesystem_eval_path_cleanup( &ctx );
52
53  return rv;
54}
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