From f36a7bfcde756cae3b3e933f0e688137fb684be8 Mon Sep 17 00:00:00 2001 From: Joel Sherrill Date: Thu, 28 Feb 2002 20:43:50 +0000 Subject: 2002-02-28 Victor V. Vengerov * DOS filesystem including FAT12, FAT16, and FAT32 support submitted. * src/dosfs, src/dosfs/Makefile.am, src/dosfs/stamp-h2.in, src/dosfs/config.h.in, src/dosfs/dosfs.h, src/dosfs/fat.c, src/dosfs/fat.h, src/dosfs/fat_fat_operations.c, src/dosfs/fat_fat_operations.h, src/dosfs/fat_file.c, src/dosfs/fat_file.h, src/dosfs/msdos.h, src/dosfs/msdos_create.c, src/dosfs/msdos_dir.c, src/dosfs/msdos_eval.c, src/dosfs/msdos_file.c, src/dosfs/msdos_free.c, src/dosfs/msdos_fsunmount.c, src/dosfs/msdos_handlers_dir.c, src/dosfs/msdos_handlers_file.c, src/dosfs/msdos_init.c, src/dosfs/msdos_initsupp.c, src/dosfs/msdos_misc.c, src/dosfs/msdos_mknod.c, src/dosfs/msdos_node_type.c, src/dosfs/.cvsignore: New files. * configure.ac, src/Makefile.am, wrapup/Makefile.am: Modified to reflect addition. --- cpukit/libfs/src/dosfs/msdos_create.c | 208 ++++++++++++++++++++++++++++++++++ 1 file changed, 208 insertions(+) create mode 100644 cpukit/libfs/src/dosfs/msdos_create.c (limited to 'cpukit/libfs/src/dosfs/msdos_create.c') diff --git a/cpukit/libfs/src/dosfs/msdos_create.c b/cpukit/libfs/src/dosfs/msdos_create.c new file mode 100644 index 0000000000..4b4c7001ca --- /dev/null +++ b/cpukit/libfs/src/dosfs/msdos_create.c @@ -0,0 +1,208 @@ +/* + * 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; +} -- cgit v1.2.3