/* * Routine to create a new MSDOS filesystem node * * Copyright (C) 2001 OKTET Ltd., St.-Petersburg, Russia * Author: Eugeny S. Mints * * 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 #include #include #include #include #include #include "fat.h" #include "fat_fat_operations.h" #include "fat_file.h" #include "msdos.h" /* msdos_creat_node -- * Create a new node. If a new node is file, FAT 32 Bytes Directory * Entry Structure (see M$ White Paper) is initialized, free space is * found in parent directory and structure is written to the disk. * In case of directory, all above steps present and also new cluster * is allocated for a new directory and dot and dotdot nodes are created * in alloceted cluster. * * PARAMETERS: * parent_loc - parent (directory we are going to create node in) * type - new node type (file or directory) * name - new node name * mode - mode * * RETURNS: * RC_OK on success, or -1 if error occured (errno set appropriately). * */ int msdos_creat_node( rtems_filesystem_location_info_t *parent_loc, msdos_node_type_t type, char *name, mode_t mode ) { int rc = RC_OK; ssize_t ret = 0; msdos_fs_info_t *fs_info = parent_loc->mt_entry->fs_info; fat_file_fd_t *parent_fat_fd = parent_loc->node_access; fat_file_fd_t *fat_fd = NULL; time_t time_ret = 0; unsigned16 time_val = 0; unsigned16 date = 0; fat_auxiliary_t aux; unsigned char new_node[MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE]; unsigned char dot_dotdot[MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE * 2]; memset(new_node, 0, MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE); memset(dot_dotdot, 0, MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE * 2); /* set up name */ strncpy(MSDOS_DIR_NAME(new_node), name, MSDOS_NAME_MAX); /* fill reserved field */ *MSDOS_DIR_NT_RES(new_node) = MSDOS_RES_NT_VALUE; /* set up last write date and time */ time_ret = time(NULL); if ( time_ret == -1 ) return -1; msdos_date_unix2dos(time_ret, &time_val, &date); *MSDOS_DIR_WRITE_TIME(new_node) = CT_LE_W(time_val); *MSDOS_DIR_WRITE_DATE(new_node) = CT_LE_W(date); /* initialize directory/file size */ *MSDOS_DIR_FILE_SIZE(new_node) = MSDOS_INIT_DIR_SIZE; if (type == MSDOS_DIRECTORY) *MSDOS_DIR_ATTR(new_node) |= MSDOS_ATTR_DIRECTORY; else *MSDOS_DIR_ATTR(new_node) |= MSDOS_ATTR_ARCHIVE; /* * find free space in the parent directory and write new initialized * FAT 32 Bytes Directory Entry Structure (see M$ White Paper) * to the disk */ rc = msdos_get_name_node(parent_loc, NULL, &aux, new_node); if ( rc != RC_OK ) return rc; /* * if we create a new file we are done, if directory there are more steps * to do */ if (type == MSDOS_DIRECTORY) { /* open new directory as fat-file */ rc = fat_file_open(parent_loc->mt_entry, aux.cln, aux.ofs, &fat_fd); if (rc != RC_OK) goto err; /* * we opened fat-file for node we just created, so initialize fat-file * descritor */ fat_fd->info_cln = aux.cln; fat_fd->info_ofs = aux.ofs; fat_fd->fat_file_size = 0; fat_fd->fat_file_type = FAT_DIRECTORY; fat_fd->size_limit = MSDOS_MAX_DIR_LENGHT; /* * dot and dotdot entries are identical to new node except the * names */ memcpy(DOT_NODE_P(dot_dotdot), new_node, MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE); memcpy(DOTDOT_NODE_P(dot_dotdot), new_node, MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE); memcpy(MSDOS_DIR_NAME(DOT_NODE_P(dot_dotdot)), MSDOS_DOT_NAME, MSDOS_NAME_MAX); memcpy(MSDOS_DIR_NAME(DOTDOT_NODE_P(dot_dotdot)), MSDOS_DOTDOT_NAME, MSDOS_NAME_MAX); /* set up cluster num for dotdot entry */ /* * here we can ommit FAT32 condition because for all FAT types dirs * right under root dir should contain 0 in dotdot entry but for * FAT12/16 parent_fat_fd->cluster_num always contains such value */ if ((FAT_FD_OF_ROOT_DIR(parent_fat_fd)) && (fs_info->fat.vol.type & FAT_FAT32)) { *MSDOS_DIR_FIRST_CLUSTER_LOW(DOTDOT_NODE_P(dot_dotdot)) = 0x0000; *MSDOS_DIR_FIRST_CLUSTER_HI(DOTDOT_NODE_P(dot_dotdot)) = 0x0000; } else { *MSDOS_DIR_FIRST_CLUSTER_LOW(DOTDOT_NODE_P(dot_dotdot)) = CT_LE_W((unsigned16)((parent_fat_fd->cln) & 0x0000FFFF)); *MSDOS_DIR_FIRST_CLUSTER_HI(DOTDOT_NODE_P(dot_dotdot)) = CT_LE_W((unsigned16)(((parent_fat_fd->cln) & 0xFFFF0000)>>16)); } /* * write dot and dotdot entries to new fat-file: currently fat-file * correspondes to a new node is zero length, so it will be extended * by one cluster and entries will be written */ ret = fat_file_write(parent_loc->mt_entry, fat_fd, 0, MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE * 2, dot_dotdot); if (ret < 0) { rc = -1; goto error; } /* increment fat-file size by cluster size */ fat_fd->fat_file_size += fs_info->fat.vol.bpc; /* set up cluster num for dot entry */ *MSDOS_DIR_FIRST_CLUSTER_LOW(DOT_NODE_P(dot_dotdot)) = CT_LE_W((unsigned16)((fat_fd->cln) & 0x0000FFFF)); *MSDOS_DIR_FIRST_CLUSTER_HI(DOT_NODE_P(dot_dotdot)) = CT_LE_W((unsigned16)(((fat_fd->cln) & 0xFFFF0000) >> 16)); /* rewrite dot entry */ ret = fat_file_write(parent_loc->mt_entry, fat_fd, 0, MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE, DOT_NODE_P(dot_dotdot)); if (ret < 0) { rc = -1; goto error; } /* write first cluster num of a new directory to disk */ rc = msdos_set_first_cluster_num(parent_loc->mt_entry, fat_fd); if (rc != RC_OK) goto error; fat_file_close(parent_loc->mt_entry, fat_fd); } return RC_OK; error: fat_file_close(parent_loc->mt_entry, fat_fd); err: /* mark 32bytes structure on the disk as free */ msdos_set_first_char4file_name(parent_loc->mt_entry, aux.cln, aux.ofs, 0xE5); return rc; }