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/*
* Evaluation IMFS Node Support Routines
*
* COPYRIGHT (c) 1989-1999.
* On-Line Applications Research Corporation (OAR).
*
* Modifications to support reference counting in the file system are
* Copyright (c) 2012 embedded brains GmbH.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include "imfs.h"
void IMFS_Set_handlers( rtems_filesystem_location_info_t *loc )
{
IMFS_jnode_t *node = loc->node_access;
IMFS_fs_info_t *fs_info = loc->mt_entry->fs_info;
const rtems_filesystem_file_handlers_r *handlers;
switch ( node->type ) {
case IMFS_DIRECTORY:
handlers = &IMFS_directory_handlers;
break;
case IMFS_DEVICE:
handlers = &IMFS_device_handlers;
break;
case IMFS_HARD_LINK:
case IMFS_SYM_LINK:
handlers = fs_info->link_handlers;
break;
case IMFS_MEMORY_FILE:
case IMFS_LINEAR_FILE:
handlers = &IMFS_memfile_handlers;
break;
case IMFS_FIFO:
handlers = fs_info->fifo_handlers;
break;
default:
IMFS_assert( 0 );
break;
}
loc->handlers = handlers;
}
static bool IMFS_is_directory(
rtems_filesystem_eval_path_context_t *ctx,
void *arg
)
{
rtems_filesystem_location_info_t *currentloc =
rtems_filesystem_eval_path_get_currentloc( ctx );
IMFS_jnode_t *node = currentloc->node_access;
return node->type == IMFS_DIRECTORY;
}
static IMFS_jnode_t *IMFS_search_in_directory(
IMFS_jnode_t *dir,
const char *token,
size_t tokenlen
)
{
if ( rtems_filesystem_is_current_directory( token, tokenlen ) ) {
return dir;
} else {
if ( rtems_filesystem_is_parent_directory( token, tokenlen ) ) {
return dir->Parent;
} else {
rtems_chain_control *entries = &dir->info.directory.Entries;
rtems_chain_node *current = rtems_chain_first( entries );
rtems_chain_node *tail = rtems_chain_tail( entries );
while ( current != tail ) {
IMFS_jnode_t *entry = (IMFS_jnode_t *) current;
bool match = strncmp( entry->name, token, tokenlen ) == 0
&& entry->name [tokenlen] == '\0';
if ( match ) {
return entry;
}
current = rtems_chain_next( current );
}
return NULL;
}
}
}
static rtems_filesystem_global_location_t **IMFS_is_mount_point(
IMFS_jnode_t *node
)
{
rtems_filesystem_global_location_t **fs_root_ptr = NULL;
if ( node->type == IMFS_DIRECTORY ) {
if ( node->info.directory.mt_fs != NULL ) {
fs_root_ptr = &node->info.directory.mt_fs->mt_fs_root;
}
}
return fs_root_ptr;
}
static rtems_filesystem_eval_path_generic_status IMFS_eval_token(
rtems_filesystem_eval_path_context_t *ctx,
void *arg,
const char *token,
size_t tokenlen
)
{
rtems_filesystem_eval_path_generic_status status =
RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_DONE;
rtems_filesystem_location_info_t *currentloc =
rtems_filesystem_eval_path_get_currentloc( ctx );
IMFS_jnode_t *dir = currentloc->node_access;
bool access_ok = rtems_filesystem_eval_path_check_access(
ctx,
RTEMS_LIBIO_PERMS_SEARCH,
dir->st_mode,
dir->st_uid,
dir->st_gid
);
if ( access_ok ) {
IMFS_jnode_t *entry = IMFS_search_in_directory( dir, token, tokenlen );
if ( entry != NULL ) {
bool terminal = !rtems_filesystem_eval_path_has_path( ctx );
int eval_flags = rtems_filesystem_eval_path_get_flags( ctx );
bool follow_hard_link = (eval_flags & RTEMS_LIBIO_FOLLOW_HARD_LINK) != 0;
bool follow_sym_link = (eval_flags & RTEMS_LIBIO_FOLLOW_SYM_LINK) != 0;
rtems_filesystem_eval_path_clear_token( ctx );
if ( entry->type == IMFS_HARD_LINK && (follow_hard_link || !terminal)) {
entry = entry->info.hard_link.link_node;
}
if ( entry->type == IMFS_SYM_LINK && (follow_sym_link || !terminal)) {
const char *target = entry->info.sym_link.name;
rtems_filesystem_eval_path_recursive( ctx, target, strlen( target ) );
} else {
rtems_filesystem_global_location_t **fs_root_ptr =
IMFS_is_mount_point( entry );
if ( fs_root_ptr == NULL ) {
currentloc->node_access = entry;
IMFS_Set_handlers( currentloc );
if ( !terminal ) {
status = RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_CONTINUE;
}
} else {
access_ok = rtems_filesystem_eval_path_check_access(
ctx,
RTEMS_LIBIO_PERMS_EXEC,
entry->st_mode,
entry->st_uid,
entry->st_gid
);
if ( access_ok ) {
rtems_filesystem_eval_path_restart( ctx, fs_root_ptr );
}
}
}
} else {
status = RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_NO_ENTRY;
}
}
return status;
}
static const rtems_filesystem_eval_path_generic_config IMFS_eval_config = {
.is_directory = IMFS_is_directory,
.eval_token = IMFS_eval_token
};
void IMFS_eval_path( rtems_filesystem_eval_path_context_t *ctx )
{
rtems_filesystem_eval_path_generic( ctx, NULL, &IMFS_eval_config );
}
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