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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* mount()
*
* Mange the mount table. You can iterate on mounts and file systems, as well
* as add and remove file systems not in the file system confiration table.
*
* COPYRIGHT (c) Chris Johns <chrisj@rtems.org> 2010.
*
* Copyright (c) 2010 embedded brains GmbH & Co. KG
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <rtems/chain.h>
#include <rtems/seterr.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <rtems/libio_.h>
typedef struct {
rtems_chain_node node;
rtems_filesystem_table_t entry;
} filesystem_node;
static RTEMS_CHAIN_DEFINE_EMPTY(filesystem_chain);
bool rtems_filesystem_iterate(
rtems_per_filesystem_routine routine,
void *routine_arg
)
{
rtems_chain_control *chain = &filesystem_chain;
const rtems_filesystem_table_t *table_entry = &rtems_filesystem_table [0];
rtems_chain_node *node = NULL;
bool stop = false;
while ( table_entry->type && !stop ) {
stop = (*routine)( table_entry, routine_arg );
++table_entry;
}
if ( !stop ) {
rtems_libio_lock();
for (
node = rtems_chain_first( chain );
!rtems_chain_is_tail( chain, node ) && !stop;
node = rtems_chain_next( node )
) {
const filesystem_node *fsn = (filesystem_node *) node;
stop = (*routine)( &fsn->entry, routine_arg );
}
rtems_libio_unlock();
}
return stop;
}
typedef struct {
const char *type;
rtems_filesystem_fsmount_me_t mount_h;
} find_arg;
static bool find_handler(const rtems_filesystem_table_t *entry, void *arg)
{
find_arg *fa = arg;
if ( strcmp( entry->type, fa->type ) != 0 ) {
return false;
} else {
fa->mount_h = entry->mount_h;
return true;
}
}
rtems_filesystem_fsmount_me_t
rtems_filesystem_get_mount_handler(
const char *type
)
{
find_arg fa = {
.type = type,
.mount_h = NULL
};
if ( type != NULL ) {
rtems_filesystem_iterate( find_handler, &fa );
}
return fa.mount_h;
}
int
rtems_filesystem_register(
const char *type,
rtems_filesystem_fsmount_me_t mount_h
)
{
rtems_chain_control *chain = &filesystem_chain;
size_t type_size = strlen(type) + 1;
size_t fsn_size = sizeof( filesystem_node ) + type_size;
filesystem_node *fsn = malloc( fsn_size );
char *type_storage = (char *) fsn + sizeof( *fsn );
if ( fsn == NULL )
rtems_set_errno_and_return_minus_one( ENOMEM );
memcpy(type_storage, type, type_size);
fsn->entry.type = type_storage;
fsn->entry.mount_h = mount_h;
rtems_libio_lock();
if ( rtems_filesystem_get_mount_handler( type ) == NULL ) {
rtems_chain_initialize_node( &fsn->node );
rtems_chain_append_unprotected( chain, &fsn->node );
} else {
rtems_libio_unlock();
free( fsn );
rtems_set_errno_and_return_minus_one( EINVAL );
}
rtems_libio_unlock();
return 0;
}
int
rtems_filesystem_unregister(
const char *type
)
{
rtems_chain_control *chain = &filesystem_chain;
rtems_chain_node *node = NULL;
if ( type == NULL ) {
rtems_set_errno_and_return_minus_one( EINVAL );
}
rtems_libio_lock();
for (
node = rtems_chain_first( chain );
!rtems_chain_is_tail( chain, node );
node = rtems_chain_next( node )
) {
filesystem_node *fsn = (filesystem_node *) node;
if ( strcmp( fsn->entry.type, type ) == 0 ) {
rtems_chain_extract_unprotected( node );
free( fsn );
rtems_libio_unlock();
return 0;
}
}
rtems_libio_unlock();
rtems_set_errno_and_return_minus_one( ENOENT );
}
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