diff options
Diffstat (limited to 'cpukit/libfs/src/dosfs/msdos_initsupp.c')
| -rw-r--r-- | cpukit/libfs/src/dosfs/msdos_initsupp.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/cpukit/libfs/src/dosfs/msdos_initsupp.c b/cpukit/libfs/src/dosfs/msdos_initsupp.c new file mode 100644 index 0000000000..eee8a6f9b2 --- /dev/null +++ b/cpukit/libfs/src/dosfs/msdos_initsupp.c @@ -0,0 +1,149 @@ +/* + * MSDOS Initialization support routine implementation + * + * Copyright (C) 2001 OKTET Ltd., St.-Petersburg, Russia + * Author: Eugeny S. Mints <Eugeny.Mints@oktet.ru> + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.OARcorp.com/rtems/license.html. + * + * @(#) $Id$ + */ + +#if HAVE_CONFIG_H +#include "config.h" +#endif + +#include <sys/types.h> +#include <fcntl.h> +#include <unistd.h> +#include <stdlib.h> +#include <stdio.h> + +#include <assert.h> +#include <rtems.h> +#include <rtems/libio_.h> + +#include "fat.h" +#include "fat_fat_operations.h" +#include "fat_file.h" + +#include "msdos.h" + +/* 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, + rtems_filesystem_operations_table *op_table, + rtems_filesystem_file_handlers_r *file_handlers, + rtems_filesystem_file_handlers_r *directory_handlers + ) +{ + int rc = RC_OK; + rtems_status_code sc = RTEMS_SUCCESSFUL; + msdos_fs_info_t *fs_info = NULL; + fat_file_fd_t *fat_fd = NULL; + unsigned32 cl_buf_size; + + fs_info = (msdos_fs_info_t *)calloc(1, sizeof(msdos_fs_info_t)); + if (!fs_info) + set_errno_and_return_minus_one(ENOMEM); + + temp_mt_entry->fs_info = fs_info; + + rc = fat_init_volume_info(temp_mt_entry); + 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) + */ + rc = fat_file_open(temp_mt_entry, FAT_ROOTDIR_CLUSTER_NUM, 0, &fat_fd); + if (rc != RC_OK) + { + fat_shutdown_drive(temp_mt_entry); + 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_LENGHT; + fat_fd->info_cln = FAT_ROOTDIR_CLUSTER_NUM; + fat_fd->info_ofs = 0; + 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(temp_mt_entry, fat_fd); + if ( rc != RC_OK ) + { + fat_file_close(temp_mt_entry, fat_fd); + fat_shutdown_drive(temp_mt_entry); + free(fs_info); + return rc; + } + cl_buf_size = fs_info->fat.vol.bpc; + } + + fs_info->cl_buf = (char *)calloc(cl_buf_size, sizeof(char)); + if (fs_info->cl_buf == NULL) + { + fat_file_close(temp_mt_entry, fat_fd); + fat_shutdown_drive(temp_mt_entry); + free(fs_info); + set_errno_and_return_minus_one(ENOMEM); + } + + sc = rtems_semaphore_create(3, + 1, + RTEMS_BINARY_SEMAPHORE | RTEMS_FIFO, + RTEMS_INHERIT_PRIORITY, + &fs_info->vol_sema); + if (sc != RTEMS_SUCCESSFUL) + { + fat_file_close(temp_mt_entry, fat_fd); + fat_shutdown_drive(temp_mt_entry); + free(fs_info->cl_buf); + free(fs_info); + set_errno_and_return_minus_one( EIO ); + } + + temp_mt_entry->mt_fs_root.node_access = fat_fd; + temp_mt_entry->mt_fs_root.handlers = directory_handlers; + temp_mt_entry->mt_fs_root.ops = op_table; + + return rc; +} |