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/**
* @file
*
* @brief IMFS Node Support
* @ingroup IMFS
*/
/*
* 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.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include "imfs.h"
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
/*
* 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_jnode_t *IMFS_initialize_node(
IMFS_jnode_t *node,
const IMFS_node_control *node_control,
const char *name,
size_t namelen,
mode_t mode,
void *arg
)
{
struct timeval tv;
if ( namelen > IMFS_NAME_MAX ) {
errno = ENAMETOOLONG;
return NULL;
}
gettimeofday( &tv, 0 );
/*
* Fill in the basic information
*/
node->reference_count = 1;
node->st_nlink = 1;
memcpy( node->name, name, namelen );
node->name [namelen] = '\0';
node->control = node_control;
/*
* Fill in the mode and permission information for the jnode structure.
*/
node->st_mode = mode;
node->st_uid = geteuid();
node->st_gid = getegid();
/*
* Now set all the times.
*/
node->stat_atime = (time_t) tv.tv_sec;
node->stat_mtime = (time_t) tv.tv_sec;
node->stat_ctime = (time_t) tv.tv_sec;
return (*node_control->node_initialize)( node, arg );
}
int IMFS_initialize_support(
rtems_filesystem_mount_table_entry_t *mt_entry,
const void *data
)
{
const IMFS_mount_data *mount_data = data;
IMFS_fs_info_t *fs_info = mount_data->fs_info;
IMFS_jnode_t *root_node;
fs_info->mknod_controls = mount_data->mknod_controls;
root_node = IMFS_initialize_node(
&fs_info->Root_directory.Node,
&fs_info->mknod_controls->directory->node_control,
"",
0,
(S_IFDIR | 0755),
NULL
);
IMFS_assert( root_node != NULL );
mt_entry->fs_info = fs_info;
mt_entry->ops = mount_data->ops;
mt_entry->pathconf_limits_and_options = &IMFS_LIMITS_AND_OPTIONS;
mt_entry->mt_fs_root->location.node_access = root_node;
IMFS_Set_handlers( &mt_entry->mt_fs_root->location );
IMFS_determine_bytes_per_block(
&imfs_memfile_bytes_per_block,
imfs_rq_memfile_bytes_per_block,
IMFS_MEMFILE_DEFAULT_BYTES_PER_BLOCK
);
return 0;
}
int IMFS_node_clone( rtems_filesystem_location_info_t *loc )
{
IMFS_jnode_t *node = loc->node_access;
++node->reference_count;
return 0;
}
void IMFS_node_destroy( IMFS_jnode_t *node )
{
IMFS_assert( node->reference_count == 0 );
(*node->control->node_destroy)( node );
}
void IMFS_node_free( const rtems_filesystem_location_info_t *loc )
{
IMFS_jnode_t *node = loc->node_access;
--node->reference_count;
if ( node->reference_count == 0 ) {
IMFS_node_destroy( node );
}
}
static IMFS_jnode_t *IMFS_node_initialize_enosys(
IMFS_jnode_t *node,
void *arg
)
{
errno = ENOSYS;
return NULL;
}
IMFS_jnode_t *IMFS_node_initialize_default(
IMFS_jnode_t *node,
void *arg
)
{
return node;
}
IMFS_jnode_t *IMFS_node_remove_default(
IMFS_jnode_t *node
)
{
return node;
}
void IMFS_node_destroy_default( IMFS_jnode_t *node )
{
free( node );
}
const IMFS_mknod_control IMFS_mknod_control_enosys = {
{
.handlers = &rtems_filesystem_handlers_default,
.node_initialize = IMFS_node_initialize_enosys,
.node_remove = IMFS_node_remove_default,
.node_destroy = IMFS_node_destroy_default
},
.node_size = sizeof( IMFS_jnode_t )
};
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