forked from Imagelibrary/rtems
110 lines
3.5 KiB
C
110 lines
3.5 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/**
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* @file
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*
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* @brief Unmount a File System
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* @ingroup libcsupport
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*/
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/*
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* COPYRIGHT (c) 1989-2010.
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* On-Line Applications Research Corporation (OAR).
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <errno.h>
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#include <rtems/libio_.h>
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static bool contains_root_or_current_directory(
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const rtems_filesystem_mount_table_entry_t *mt_entry
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)
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{
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const rtems_filesystem_location_info_t *root =
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&rtems_filesystem_root->location;
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const rtems_filesystem_location_info_t *current =
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&rtems_filesystem_current->location;
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return mt_entry == root->mt_entry || mt_entry == current->mt_entry;
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}
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/**
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* This routine is not defined in the POSIX 1003.1b standard but
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* in some form is supported on most UNIX and POSIX systems. This
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* routine is necessary to mount instantiations of a file system
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* into the file system name space.
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*/
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int unmount( const char *path )
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{
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int rv = 0;
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rtems_filesystem_eval_path_context_t ctx;
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int eval_flags = RTEMS_FS_FOLLOW_LINK;
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const rtems_filesystem_location_info_t *currentloc =
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rtems_filesystem_eval_path_start( &ctx, path, eval_flags );
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rtems_filesystem_mount_table_entry_t *mt_entry = currentloc->mt_entry;
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if ( rtems_filesystem_location_is_instance_root( currentloc ) ) {
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if ( !contains_root_or_current_directory( mt_entry ) ) {
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const rtems_filesystem_operations_table *mt_point_ops =
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mt_entry->mt_point_node->location.mt_entry->ops;
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rv = (*mt_point_ops->unmount_h)( mt_entry );
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if ( rv == 0 ) {
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rtems_id self_task_id = rtems_task_self();
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rtems_filesystem_mt_entry_declare_lock_context( lock_context );
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rtems_filesystem_mt_entry_lock( lock_context );
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mt_entry->unmount_task = self_task_id;
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mt_entry->mounted = false;
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rtems_filesystem_mt_entry_unlock( lock_context );
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}
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} else {
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errno = EBUSY;
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rv = -1;
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}
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} else {
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errno = EACCES;
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rv = -1;
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}
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rtems_filesystem_eval_path_cleanup( &ctx );
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if ( rv == 0 ) {
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rtems_status_code sc = rtems_event_transient_receive(
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RTEMS_WAIT,
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RTEMS_NO_TIMEOUT
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);
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if ( sc != RTEMS_SUCCESSFUL ) {
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rtems_fatal_error_occurred( 0xdeadbeef );
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}
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}
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return rv;
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}
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