src/imfs/imfs_node.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup IMFS
0007  *
0008  * @brief IMFS Node Support
0009  */
0010
0011 /*
0012  *  COPYRIGHT (c) 1989-1999.
0013  *  On-Line Applications Research Corporation (OAR).
0014  *
0015  *  Modifications to support reference counting in the file system are
0016  *  Copyright (c) 2012 embedded brains GmbH & Co. KG
0017  *
0018  * Redistribution and use in source and binary forms, with or without
0019  * modification, are permitted provided that the following conditions
0020  * are met:
0021  * 1. Redistributions of source code must retain the above copyright
0022  *    notice, this list of conditions and the following disclaimer.
0023  * 2. Redistributions in binary form must reproduce the above copyright
0024  *    notice, this list of conditions and the following disclaimer in the
0025  *    documentation and/or other materials provided with the distribution.
0026  *
0027  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0028  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0029  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0030  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0031  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0032  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0033  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0034  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0035  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0036  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0037  * POSSIBILITY OF SUCH DAMAGE.
0038  */
0039
0040 #ifdef HAVE_CONFIG_H
0041 #include "config.h"
0042 #endif
0043
0044 #include <rtems/imfsimpl.h>
0045
0046 IMFS_jnode_t *IMFS_initialize_node(
0047   IMFS_jnode_t *node,
0048   const IMFS_node_control *node_control,
0049   const char *name,
0050   size_t namelen,
0051   mode_t mode,
0052   void *arg
0053 )
0054 {
0055   time_t now;
0056
0057   if ( namelen > IMFS_NAME_MAX ) {
0058     errno = ENAMETOOLONG;
0059
0060     return NULL;
0061   }
0062
0063   /*
0064    *  Fill in the basic information
0065    */
0066   node->name = name;
0067   node->namelen = namelen;
0068   node->reference_count = 1;
0069   node->st_nlink = 1;
0070   node->control = node_control;
0071
0072   /*
0073    *  Fill in the mode and permission information for the jnode structure.
0074    */
0075   node->st_mode = mode;
0076   node->st_uid = geteuid();
0077   node->st_gid = getegid();
0078
0079   /*
0080    *  Now set all the times.
0081    */
0082
0083   now = _IMFS_get_time();
0084   node->stat_atime = now;
0085   node->stat_mtime = now;
0086   node->stat_ctime = now;
0087
0088   return (*node_control->node_initialize)( node, arg );
0089 }
0090
0091 int IMFS_node_clone( rtems_filesystem_location_info_t *loc )
0092 {
0093   IMFS_jnode_t *node = loc->node_access;
0094
0095   ++node->reference_count;
0096
0097   return 0;
0098 }
0099
0100 void IMFS_node_destroy( IMFS_jnode_t *node )
0101 {
0102   IMFS_assert( node->reference_count == 0 );
0103
0104   (*node->control->node_destroy)( node );
0105 }
0106
0107 void IMFS_node_free( const rtems_filesystem_location_info_t *loc )
0108 {
0109   IMFS_jnode_t *node = loc->node_access;
0110
0111   --node->reference_count;
0112
0113   if ( node->reference_count == 0 ) {
0114     IMFS_node_destroy( node );
0115   }
0116 }
0117
0118 IMFS_jnode_t *IMFS_node_remove_default(
0119   IMFS_jnode_t *node
0120 )
0121 {
0122   return node;
0123 }
0124
0125 void IMFS_do_nothing_destroy( IMFS_jnode_t *node )
0126 {
0127   (void) node;
0128 }