source: rtems/cpukit/libcsupport/src/unmount.c @ 847ad44

4.11
Last change on this file since 847ad44 was 847ad44, checked in by Sebastian Huber <sebastian.huber@…>, on May 23, 2012 at 9:39:50 AM

Filesystem: Wait for unmount() to finish

  • Property mode set to 100644
File size: 2.4 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
25static bool contains_root_or_current_directory(
26  const rtems_filesystem_mount_table_entry_t *mt_entry
27)
28{
29  const rtems_filesystem_location_info_t *root =
30    &rtems_filesystem_root->location;
31  const rtems_filesystem_location_info_t *current =
32    &rtems_filesystem_current->location;
33
34  return mt_entry == root->mt_entry || mt_entry == current->mt_entry;
35}
36
37int unmount( const char *path )
38{
39  int rv = 0;
40  rtems_filesystem_eval_path_context_t ctx;
41  int eval_flags = RTEMS_FS_FOLLOW_LINK;
42  const rtems_filesystem_location_info_t *currentloc =
43    rtems_filesystem_eval_path_start( &ctx, path, eval_flags );
44  rtems_filesystem_mount_table_entry_t *mt_entry = currentloc->mt_entry;
45
46  if ( rtems_filesystem_location_is_root( currentloc ) ) {
47    if ( !contains_root_or_current_directory( mt_entry ) ) {
48      const rtems_filesystem_operations_table *mt_point_ops =
49        mt_entry->mt_point_node->location.mt_entry->ops;
50
51      rv = (*mt_point_ops->unmount_h)( mt_entry );
52      if ( rv == 0 ) {
53        rtems_id self_task_id = rtems_task_self();
54        rtems_filesystem_mt_entry_declare_lock_context( lock_context );
55
56        rtems_filesystem_mt_entry_lock( lock_context );
57        mt_entry->unmount_task = self_task_id;
58        mt_entry->mounted = false;
59        rtems_filesystem_mt_entry_unlock( lock_context );
60      }
61    } else {
62      errno = EBUSY;
63      rv = -1;
64    }
65  } else {
66    errno = EACCES;
67    rv = -1;
68  }
69
70  rtems_filesystem_eval_path_cleanup( &ctx );
71
72  if ( rv == 0 ) {
73    rtems_event_set out;
74    rtems_status_code sc = rtems_event_receive(
75      RTEMS_FILESYSTEM_UNMOUNT_EVENT,
76      RTEMS_EVENT_ALL | RTEMS_WAIT,
77      RTEMS_NO_TIMEOUT,
78      &out
79    );
80
81    if ( sc != RTEMS_SUCCESSFUL ) {
82      rtems_fatal_error_occurred( 0xdeadbeef );
83    }
84  }
85
86  return rv;
87}
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