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/*
* 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.
*
* 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.
*
* $Id$
*/
#if 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 <assert.h>
#include <rtems/libio_.h>
/*
* External defined by confdefs.h or the user.
*/
extern const rtems_filesystem_table_t configuration_filesystem_table[];
/*
* Points to a list of filesystems added at runtime.
*/
extern rtems_chain_control *rtems_filesystem_table;
/*
* Mount table list.
*/
extern rtems_chain_control rtems_filesystem_mount_table_control;
extern bool rtems_filesystem_mount_table_control_init;
/*
* Get the first entry in the filesystem table.
*/
const rtems_filesystem_table_t*
rtems_filesystem_table_first(
void
)
{
/*
* We can assume this because it is the root file system.
*/
return &configuration_filesystem_table[0];
}
/*
* Get the next entry in the file system table.
*/
const rtems_filesystem_table_t*
rtems_filesystem_table_next(
const rtems_filesystem_table_t *entry
)
{
const rtems_filesystem_table_t* fs;
fs = rtems_filesystem_table_first( );
while ( fs->type && ( fs != entry ) )
++fs;
if ( fs->type ) {
++fs;
if ( fs->type )
return fs;
}
if ( rtems_filesystem_table ) {
rtems_chain_node* node;
for (node = rtems_chain_first( rtems_filesystem_table );
!rtems_chain_is_tail( rtems_filesystem_table, node);
node = rtems_chain_next( node )) {
rtems_filesystem_table_node_t* tnode;
tnode = (rtems_filesystem_table_node_t*) node;
if ( entry == &tnode->entry ) {
node = rtems_chain_next( node );
if ( !rtems_chain_is_tail( rtems_filesystem_table, node ) ) {
tnode = (rtems_filesystem_table_node_t*) node;
return &tnode->entry;
}
}
}
}
return NULL;
}
/*
* Get the first entry in the mount table.
*/
rtems_filesystem_mount_table_entry_t*
rtems_filesystem_mounts_first(
void
)
{
rtems_filesystem_mount_table_entry_t* entry = NULL;
if ( rtems_filesystem_mount_table_control_init ) {
if ( !rtems_chain_is_empty( &rtems_filesystem_mount_table_control ) )
entry = (rtems_filesystem_mount_table_entry_t*)
rtems_chain_first( &rtems_filesystem_mount_table_control );
}
return entry;
}
/*
* Get the next entry in the mount table.
*/
rtems_filesystem_mount_table_entry_t*
rtems_filesystem_mounts_next(
rtems_filesystem_mount_table_entry_t *entry
)
{
if ( !rtems_filesystem_mount_table_control_init || !entry )
return NULL;
return (rtems_filesystem_mount_table_entry_t*) rtems_chain_next( &entry->Node );
}
/*
* Register a file system.
*/
int
rtems_filesystem_register(
const char *type,
rtems_filesystem_fsmount_me_t mount_h
)
{
rtems_filesystem_table_node_t *fs;
if ( !rtems_filesystem_table ) {
rtems_filesystem_table = malloc( sizeof( rtems_chain_control ) );
if ( !rtems_filesystem_table )
rtems_set_errno_and_return_minus_one( ENOMEM );
rtems_chain_initialize_empty ( rtems_filesystem_table );
}
fs = malloc( sizeof( rtems_filesystem_table_node_t ) );
if ( !fs )
rtems_set_errno_and_return_minus_one( ENOMEM );
fs->entry.type = strdup( type );
if ( !fs->entry.type ) {
free( fs );
rtems_set_errno_and_return_minus_one( ENOMEM );
}
fs->entry.mount_h = mount_h;
rtems_chain_append( rtems_filesystem_table, &fs->node );
return 0;
}
/*
* Unregister a file system.
*/
int
rtems_filesystem_unregister(
const char *type
)
{
if ( rtems_filesystem_table ) {
rtems_chain_node *node;
for (node = rtems_chain_first( rtems_filesystem_table );
!rtems_chain_is_tail( rtems_filesystem_table, node );
node = rtems_chain_next( node ) ) {
rtems_filesystem_table_node_t *fs;
fs = (rtems_filesystem_table_node_t*) node;
if ( strcmp( fs->entry.type, type ) == 0 ) {
rtems_chain_extract( node );
free( (void*) fs->entry.type );
free( fs );
return 0;
}
}
}
rtems_set_errno_and_return_minus_one( ENOENT );
}
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