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/**
* @file
*
* @brief Link Operations Table for the IMFS
* @ingroup IMFS
*/
/*
* COPYRIGHT (c) 1989-1999.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include "imfs.h"
#include <stdlib.h>
#include <string.h>
static int IMFS_stat_link(
const rtems_filesystem_location_info_t *loc,
struct stat *buf
)
{
const IMFS_jnode_t *node = loc->node_access;
if ( IMFS_type( node ) != IMFS_HARD_LINK ) {
buf->st_size = strlen( node->info.sym_link.name );
return IMFS_stat( loc, buf );
} else {
rtems_filesystem_location_info_t targetloc = *loc;
targetloc.node_access = node->info.hard_link.link_node;
IMFS_Set_handlers( &targetloc );
return (targetloc.handlers->fstat_h)( &targetloc, buf );
}
}
static const rtems_filesystem_file_handlers_r IMFS_link_handlers = {
.open_h = rtems_filesystem_default_open,
.close_h = rtems_filesystem_default_close,
.read_h = rtems_filesystem_default_read,
.write_h = rtems_filesystem_default_write,
.ioctl_h = rtems_filesystem_default_ioctl,
.lseek_h = rtems_filesystem_default_lseek,
.fstat_h = IMFS_stat_link,
.ftruncate_h = rtems_filesystem_default_ftruncate,
.fsync_h = rtems_filesystem_default_fsync_or_fdatasync,
.fdatasync_h = rtems_filesystem_default_fsync_or_fdatasync,
.fcntl_h = rtems_filesystem_default_fcntl,
.kqfilter_h = rtems_filesystem_default_kqfilter,
.poll_h = rtems_filesystem_default_poll,
.readv_h = rtems_filesystem_default_readv,
.writev_h = rtems_filesystem_default_writev
};
static IMFS_jnode_t *IMFS_node_initialize_hard_link(
IMFS_jnode_t *node,
const IMFS_types_union *info
)
{
node->info.hard_link.link_node = info->hard_link.link_node;
return node;
}
static IMFS_jnode_t *IMFS_node_remove_hard_link(
IMFS_jnode_t *node
)
{
IMFS_jnode_t *target = node->info.hard_link.link_node;
if ( target->st_nlink == 1) {
target = (*target->control->node_remove)( target );
if ( target == NULL ) {
node = NULL;
}
} else {
--target->st_nlink;
IMFS_update_ctime( target );
}
return node;
}
const IMFS_node_control IMFS_node_control_hard_link = {
.imfs_type = IMFS_HARD_LINK,
.handlers = &IMFS_link_handlers,
.node_initialize = IMFS_node_initialize_hard_link,
.node_remove = IMFS_node_remove_hard_link,
.node_destroy = IMFS_node_destroy_default
};
static IMFS_jnode_t *IMFS_node_initialize_sym_link(
IMFS_jnode_t *node,
const IMFS_types_union *info
)
{
node->info.sym_link.name = info->sym_link.name;
return node;
}
static IMFS_jnode_t *IMFS_node_destroy_sym_link( IMFS_jnode_t *node )
{
free( node->info.sym_link.name );
return node;
}
const IMFS_node_control IMFS_node_control_sym_link = {
.imfs_type = IMFS_SYM_LINK,
.handlers = &IMFS_link_handlers,
.node_initialize = IMFS_node_initialize_sym_link,
.node_remove = IMFS_node_remove_default,
.node_destroy = IMFS_node_destroy_sym_link
};
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