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/*
* IMFS Initialization
*
* COPYRIGHT (c) 1989-2010.
* 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.com/license/LICENSE.
*
* $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/types.h> /* for mkdir */
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include "imfs.h"
#include <rtems/libio_.h>
#include <rtems/seterr.h>
#if defined(IMFS_DEBUG)
#include <stdio.h>
#endif
/*
* IMFS_determine_bytes_per_block
*/
int imfs_memfile_bytes_per_block = 0;
static int IMFS_determine_bytes_per_block(
int *dest_bytes_per_block,
int requested_bytes_per_block,
int default_bytes_per_block
)
{
bool is_valid = false;
int bit_mask;
/*
* check, whether requested bytes per block is valid
*/
for (bit_mask = 16; !is_valid && (bit_mask <= 512); bit_mask <<= 1) {
if (bit_mask == requested_bytes_per_block) {
is_valid = true;
break;
}
if(bit_mask > requested_bytes_per_block)
break;
}
*dest_bytes_per_block = ((is_valid)
? requested_bytes_per_block
: default_bytes_per_block);
return 0;
}
/*
* IMFS_initialize
*/
int IMFS_initialize_support(
rtems_filesystem_mount_table_entry_t *temp_mt_entry,
const rtems_filesystem_operations_table *op_table,
const rtems_filesystem_file_handlers_r *memfile_handlers,
const rtems_filesystem_file_handlers_r *directory_handlers,
const rtems_filesystem_file_handlers_r *fifo_handlers
)
{
static int imfs_instance;
IMFS_fs_info_t *fs_info;
IMFS_jnode_t *jnode;
/*
* determine/check value for imfs_memfile_bytes_per_block
*/
IMFS_determine_bytes_per_block(&imfs_memfile_bytes_per_block,
imfs_rq_memfile_bytes_per_block,
IMFS_MEMFILE_DEFAULT_BYTES_PER_BLOCK);
/*
* Create the root node
*
* NOTE: UNIX root is 755 and owned by root/root (0/0).
*/
temp_mt_entry->mt_fs_root.node_access = IMFS_create_root_node();
temp_mt_entry->mt_fs_root.handlers = directory_handlers;
temp_mt_entry->mt_fs_root.ops = op_table;
temp_mt_entry->pathconf_limits_and_options = IMFS_LIMITS_AND_OPTIONS;
/*
* Create custom file system data.
*/
fs_info = calloc( 1, sizeof( IMFS_fs_info_t ) );
if ( !fs_info ) {
free(temp_mt_entry->mt_fs_root.node_access);
rtems_set_errno_and_return_minus_one(ENOMEM);
}
temp_mt_entry->fs_info = fs_info;
/*
* Set st_ino for the root to 1.
*/
fs_info->instance = imfs_instance++;
fs_info->ino_count = 1;
fs_info->memfile_handlers = memfile_handlers;
fs_info->directory_handlers = directory_handlers;
fs_info->fifo_handlers = fifo_handlers;
jnode = temp_mt_entry->mt_fs_root.node_access;
jnode->st_ino = fs_info->ino_count;
return 0;
}
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