/* msdos_find_name --
* Find the node which correspondes to the name, open fat-file which
* correspondes to the found node and close fat-file which correspondes
* to the node we searched in.
*
* PARAMETERS:
* parent_loc - parent node description
* name - name to find
*
* RETURNS:
* RC_OK and updated 'parent_loc' on success, or -1 if error
* occured (errno set apropriately)
*
*/
int
msdos_find_name(
rtems_filesystem_location_info_t *parent_loc,
char *name
)
{
int rc = RC_OK;
msdos_fs_info_t *fs_info = parent_loc->mt_entry->fs_info;
fat_file_fd_t *fat_fd = NULL;
fat_auxiliary_t aux;
unsigned short time_val = 0;
unsigned short date = 0;
char node_entry[MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE];
memset(node_entry, 0, MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE);
/*
* find the node which correspondes to the name in the directory pointed by
* 'parent_loc'
*/
rc = msdos_get_name_node(parent_loc, name, &aux, node_entry);
if (rc != RC_OK)
return rc;
/* open fat-file corresponded to the found node */
rc = fat_file_open(parent_loc->mt_entry, aux.cln, aux.ofs, &fat_fd);
if (rc != RC_OK)
return rc;
/*
* I don't like this if, but: we should do it , or should write new file
* size and first cluster num to the disk after each write operation
* (even if one byte is written - that is TOO non-optimize) because
* otherwise real values of these fields stored in fat-file descriptor
* may be accidentely rewritten with wrong values stored on the disk
*/
if (fat_fd->links_num == 1)
{
fat_fd->info_cln = aux.cln;
fat_fd->info_ofs = aux.ofs;
fat_fd->cln = MSDOS_EXTRACT_CLUSTER_NUM(node_entry);
fat_fd->first_char = *MSDOS_DIR_NAME(node_entry);
time_val = *MSDOS_DIR_WRITE_TIME(node_entry);
date = *MSDOS_DIR_WRITE_DATE(node_entry);
fat_fd->mtime = msdos_date_dos2unix(CF_LE_W(time_val), CF_LE_W(date));
if ((*MSDOS_DIR_ATTR(node_entry)) & MSDOS_ATTR_DIRECTORY)
{
fat_fd->fat_file_type = FAT_DIRECTORY;
fat_fd->size_limit = MSDOS_MAX_DIR_LENGHT;
rc = fat_file_size(parent_loc->mt_entry, fat_fd);
if (rc != RC_OK)
{
fat_file_close(parent_loc->mt_entry, fat_fd);
return rc;
}
}
else
{
fat_fd->fat_file_size = CF_LE_L(*MSDOS_DIR_FILE_SIZE(node_entry));
fat_fd->fat_file_type = FAT_FILE;
fat_fd->size_limit = MSDOS_MAX_FILE_SIZE;
}
/* these data is not actual for zero-length fat-file */
fat_fd->map.file_cln = 0;
fat_fd->map.disk_cln = fat_fd->cln;
if ((fat_fd->fat_file_size != 0) &&
(fat_fd->fat_file_size <= fs_info->fat.vol.bpc))
{
fat_fd->map.last_cln = fat_fd->cln;
}
else
{
fat_fd->map.last_cln = FAT_UNDEFINED_VALUE;
}
}
/* close fat-file corresponded to the node we searched in */
rc = fat_file_close(parent_loc->mt_entry, parent_loc->node_access);
if (rc != RC_OK)
{
fat_file_close(parent_loc->mt_entry, fat_fd);
return rc;
}
/* update node_info_ptr field */
parent_loc->node_access = fat_fd;
return rc;
}
/* msdos_get_dotdot_dir_info_cluster_num_and_offset --
* Get cluster num and offset not of ".." slot, but slot which correspondes
* to real directory name.
*
* PARAMETERS:
* mt_entry - mount table entry
* cln - data cluster num extracted drom ".." slot
* paux - identify a node location on the disk -
* number of cluster and offset inside the cluster
* dir_entry - placeholder for found node
*
* RETURNS:
* RC_OK, filled 'paux' and 'dir_entry' on success, or -1 if error occured
* (errno set apropriately)
*
*/
int
msdos_get_dotdot_dir_info_cluster_num_and_offset(
rtems_filesystem_mount_table_entry_t *mt_entry,
uint32_t cln,
fat_auxiliary_t *paux,
char *dir_entry
)
{
int rc = RC_OK;
msdos_fs_info_t *fs_info = mt_entry->fs_info;
fat_file_fd_t *fat_fd = NULL;
char dot_node[MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE];
char dotdot_node[MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE];
uint32_t cl4find = 0;
memset(dot_node, 0, MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE);
memset(dotdot_node, 0, MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE);
/*
* open fat-file corresponded to ".."
*/
rc = fat_file_open(mt_entry, paux->cln, paux->ofs, &fat_fd);
if (rc != RC_OK)
return rc;
fat_fd->info_cln = paux->cln;
fat_fd->info_ofs = paux->ofs;
fat_fd->cln = cln;
fat_fd->fat_file_type = FAT_DIRECTORY;
fat_fd->size_limit = MSDOS_MAX_DIR_LENGHT;
fat_fd->map.file_cln = 0;
fat_fd->map.disk_cln = fat_fd->cln;
rc = fat_file_size(mt_entry, fat_fd);
if (rc != RC_OK)
{
fat_file_close(mt_entry, fat_fd);
return rc;
}
/* find "." node in opened directory */
rc = msdos_find_name_in_fat_file(mt_entry, fat_fd, MSDOS_DOT_NAME, paux,
dot_node);
if (rc != RC_OK)
{
fat_file_close(mt_entry, fat_fd);
return rc;
}
/* find ".." node in opened directory */
rc = msdos_find_name_in_fat_file(mt_entry, fat_fd, MSDOS_DOTDOT_NAME, paux,
dotdot_node);
if (rc != RC_OK)
{
fat_file_close(mt_entry, fat_fd);
return rc;
}
cl4find = MSDOS_EXTRACT_CLUSTER_NUM(dot_node);
/* close fat-file corresponded to ".." directory */
rc = fat_file_close(mt_entry, fat_fd);
if ( rc != RC_OK )
return rc;
if ( (MSDOS_EXTRACT_CLUSTER_NUM(dotdot_node)) == 0)
{
/*
* we handle root dir for all FAT types in the same way with the
* ordinary directories ( through fat_file_* calls )
*/
paux->cln = FAT_ROOTDIR_CLUSTER_NUM;
paux->ofs = 0;
}
/* open fat-file corresponded to second ".." */
rc = fat_file_open(mt_entry, paux->cln, paux->ofs, &fat_fd);
if (rc != RC_OK)
return rc;
fat_fd->info_cln = paux->cln;
fat_fd->info_ofs = paux->ofs;
if ((MSDOS_EXTRACT_CLUSTER_NUM(dotdot_node)) == 0)
fat_fd->cln = fs_info->fat.vol.rdir_cl;
else
fat_fd->cln = MSDOS_EXTRACT_CLUSTER_NUM(dotdot_node);
fat_fd->fat_file_type = FAT_DIRECTORY;
fat_fd->size_limit = MSDOS_MAX_DIR_LENGHT;
fat_fd->map.file_cln = 0;
fat_fd->map.disk_cln = fat_fd->cln;
rc = fat_file_size(mt_entry, fat_fd);
if (rc != RC_OK)
{
fat_file_close(mt_entry, fat_fd);
return rc;
}
/* in this directory find slot with specified cluster num */
rc = msdos_find_node_by_cluster_num_in_fat_file(mt_entry, fat_fd, cl4find,
paux, dir_entry);
if (rc != RC_OK)
{
fat_file_close(mt_entry, fat_fd);
return rc;
}
rc = fat_file_close(mt_entry, fat_fd);
return rc;
}
/* msdos_initialize_support --
* MSDOS filesystem initialization
*
* PARAMETERS:
* temp_mt_entry - mount table entry
* op_table - filesystem operations table
* file_handlers - file operations table
* directory_handlers - directory operations table
*
* RETURNS:
* RC_OK and filled temp_mt_entry on success, or -1 if error occured
* (errno set apropriately)
*
*/
int
msdos_initialize_support(
rtems_filesystem_mount_table_entry_t *temp_mt_entry,
const rtems_filesystem_operations_table *op_table,
const rtems_filesystem_file_handlers_r *file_handlers,
const rtems_filesystem_file_handlers_r *directory_handlers,
rtems_dosfs_convert_control *converter
)
{
int rc = RC_OK;
rtems_status_code sc = RTEMS_SUCCESSFUL;
msdos_fs_info_t *fs_info = NULL;
fat_file_fd_t *fat_fd = NULL;
fat_dir_pos_t root_pos;
uint32_t cl_buf_size;
fs_info = (msdos_fs_info_t *)calloc(1, sizeof(msdos_fs_info_t));
if (!fs_info)
rtems_set_errno_and_return_minus_one(ENOMEM);
temp_mt_entry->fs_info = fs_info;
fs_info->converter = converter;
rc = fat_init_volume_info(&fs_info->fat, temp_mt_entry->dev);
if (rc != RC_OK)
{
free(fs_info);
return rc;
}
fs_info->file_handlers = file_handlers;
fs_info->directory_handlers = directory_handlers;
/*
* open fat-file which correspondes to root directory
* (so inode number 0x00000010 is always used for root directory)
*/
fat_dir_pos_init(&root_pos);
root_pos.sname.cln = FAT_ROOTDIR_CLUSTER_NUM;
rc = fat_file_open(&fs_info->fat, &root_pos, &fat_fd);
if (rc != RC_OK)
{
fat_shutdown_drive(&fs_info->fat);
free(fs_info);
return rc;
}
/* again: unfortunately "fat-file" is just almost fat file :( */
fat_fd->fat_file_type = FAT_DIRECTORY;
fat_fd->size_limit = MSDOS_MAX_DIR_LENGTH;
fat_fd->cln = fs_info->fat.vol.rdir_cl;
fat_fd->map.file_cln = 0;
fat_fd->map.disk_cln = fat_fd->cln;
/* if we have FAT12/16 */
if ( fat_fd->cln == 0 )
{
fat_fd->fat_file_size = fs_info->fat.vol.rdir_size;
cl_buf_size = (fs_info->fat.vol.bpc > fs_info->fat.vol.rdir_size) ?
fs_info->fat.vol.bpc :
fs_info->fat.vol.rdir_size;
}
else
{
rc = fat_file_size(&fs_info->fat, fat_fd);
if ( rc != RC_OK )
{
fat_file_close(&fs_info->fat, fat_fd);
fat_shutdown_drive(&fs_info->fat);
free(fs_info);
return rc;
}
cl_buf_size = fs_info->fat.vol.bpc;
}
fs_info->cl_buf = (uint8_t *)calloc(cl_buf_size, sizeof(char));
if (fs_info->cl_buf == NULL)
{
fat_file_close(&fs_info->fat, fat_fd);
fat_shutdown_drive(&fs_info->fat);
free(fs_info);
rtems_set_errno_and_return_minus_one(ENOMEM);
}
sc = rtems_semaphore_create(3,
1,
RTEMS_BINARY_SEMAPHORE | RTEMS_PRIORITY |
RTEMS_INHERIT_PRIORITY,
0,
&fs_info->vol_sema);
if (sc != RTEMS_SUCCESSFUL)
{
fat_file_close(&fs_info->fat, fat_fd);
fat_shutdown_drive(&fs_info->fat);
free(fs_info->cl_buf);
free(fs_info);
rtems_set_errno_and_return_minus_one( EIO );
}
temp_mt_entry->mt_fs_root->location.node_access = fat_fd;
temp_mt_entry->mt_fs_root->location.handlers = directory_handlers;
temp_mt_entry->ops = op_table;
return rc;
}
