diff options
Diffstat (limited to 'c/src/libfs/src/dosfs/msdos_dir.c')
| -rw-r--r-- | c/src/libfs/src/dosfs/msdos_dir.c | 483 |
1 files changed, 0 insertions, 483 deletions
diff --git a/c/src/libfs/src/dosfs/msdos_dir.c b/c/src/libfs/src/dosfs/msdos_dir.c deleted file mode 100644 index 93449cd2fb..0000000000 --- a/c/src/libfs/src/dosfs/msdos_dir.c +++ /dev/null @@ -1,483 +0,0 @@ -/* - * MSDOS directory handlers 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 <stdlib.h> -#include <unistd.h> -#include <assert.h> -#include <errno.h> -#include <rtems/libio_.h> -#include <sys/types.h> -#include <sys/stat.h> - -#include <dirent.h> - -#include "fat.h" -#include "fat_fat_operations.h" -#include "fat_file.h" - -#include "msdos.h" - -/* msdos_dir_open -- - * Open fat-file which correspondes to the directory being opened and - * set offset field of file control block to zero. - * - * PARAMETERS: - * iop - file control block - * pathname - name - * flag - flags - * mode - mode - * - * RETURNS: - * RC_OK, if directory opened successfully, or -1 if error occured (errno - * set apropriately) - */ -int -msdos_dir_open(rtems_libio_t *iop, const char *pathname, unsigned32 flag, - unsigned32 mode) -{ - int rc = RC_OK; - rtems_status_code sc = RTEMS_SUCCESSFUL; - msdos_fs_info_t *fs_info = iop->pathinfo.mt_entry->fs_info; - fat_file_fd_t *fat_fd = iop->file_info; - - sc = rtems_semaphore_obtain(fs_info->vol_sema, RTEMS_WAIT, - MSDOS_VOLUME_SEMAPHORE_TIMEOUT); - if (sc != RTEMS_SUCCESSFUL) - set_errno_and_return_minus_one( EIO ); - - rc = fat_file_reopen(fat_fd); - if (rc != RC_OK) - { - rtems_semaphore_release(fs_info->vol_sema); - return rc; - } - - iop->offset = 0; - rtems_semaphore_release(fs_info->vol_sema); - return RC_OK; -} - -/* msdos_dir_close -- - * Close fat-file which correspondes to the directory being closed - * - * PARAMETERS: - * iop - file control block - * - * RETURNS: - * RC_OK, if directory closed successfully, or -1 if error occured (errno - * set apropriately. - */ -int -msdos_dir_close(rtems_libio_t *iop) -{ - int rc = RC_OK; - rtems_status_code sc = RTEMS_SUCCESSFUL; - msdos_fs_info_t *fs_info = iop->pathinfo.mt_entry->fs_info; - fat_file_fd_t *fat_fd = iop->file_info; - - sc = rtems_semaphore_obtain(fs_info->vol_sema, RTEMS_WAIT, - MSDOS_VOLUME_SEMAPHORE_TIMEOUT); - if (sc != RTEMS_SUCCESSFUL) - set_errno_and_return_minus_one( EIO ); - - rc = fat_file_close(iop->pathinfo.mt_entry, fat_fd); - if (rc != RC_OK) - { - rtems_semaphore_release(fs_info->vol_sema); - return rc; - } - - rtems_semaphore_release(fs_info->vol_sema); - return RC_OK; -} - -/* msdos_dir_read -- - * This routine will read the next directory entry based on the directory - * offset. The offset should be equal to -n- time the size of an - * individual dirent structure. If n is not an integer multiple of the - * sizeof a dirent structure, an integer division will be performed to - * determine directory entry that will be returned in the buffer. Count - * should reflect -m- times the sizeof dirent bytes to be placed in the - * buffer. - * If there are not -m- dirent elements from the current directory - * position to the end of the exisiting file, the remaining entries will - * be placed in the buffer and the returned value will be equal to - * -m actual- times the size of a directory entry. - * - * PARAMETERS: - * iop - file control block - * buffer - buffer provided by user - * count - count of bytes to read - * - * RETURNS: - * the number of bytes read on success, or -1 if error occured (errno - * set apropriately). - */ -ssize_t -msdos_dir_read(rtems_libio_t *iop, void *buffer, unsigned32 count) -{ - int rc = RC_OK; - rtems_status_code sc = RTEMS_SUCCESSFUL; - msdos_fs_info_t *fs_info = iop->pathinfo.mt_entry->fs_info; - fat_file_fd_t *fat_fd = iop->file_info; - fat_file_fd_t *tmp_fat_fd = NULL; - struct dirent tmp_dirent; - unsigned32 start = 0; - ssize_t ret = 0; - unsigned32 cmpltd = 0; - unsigned32 j = 0, i = 0; - unsigned32 bts2rd = 0; - unsigned32 cur_cln = 0; - - /* - * cast start and count - protect against using sizes that are not exact - * multiples of the -dirent- size. These could result in unexpected - * results - */ - start = iop->offset / sizeof(struct dirent); - count = (count / sizeof(struct dirent)) * sizeof(struct dirent); - - /* - * optimization: we know that root directory for FAT12/16 volumes is - * sequential set of sectors and any cluster is sequential set of sectors - * too, so read such set of sectors is quick operation for low-level IO - * layer. - */ - bts2rd = (FAT_FD_OF_ROOT_DIR(fat_fd) && - (fs_info->fat.vol.type & (FAT_FAT12 | FAT_FAT16))) ? - fat_fd->fat_file_size : - fs_info->fat.vol.bpc; - - sc = rtems_semaphore_obtain(fs_info->vol_sema, RTEMS_WAIT, - MSDOS_VOLUME_SEMAPHORE_TIMEOUT); - if (sc != RTEMS_SUCCESSFUL) - set_errno_and_return_minus_one(EIO); - - while (count > 0) - { - /* - * fat-file is already opened by open call, so read it - * Always read directory fat-file from the beggining because of MSDOS - * directories feature :( - we should count elements currently - * present in the directory because there may be holes :) - */ - ret = fat_file_read(iop->pathinfo.mt_entry, fat_fd, (j * bts2rd), - bts2rd, fs_info->cl_buf); - if (ret < MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE) - { - rtems_semaphore_release(fs_info->vol_sema); - set_errno_and_return_minus_one(EIO); - } - - for (i = 0; i < ret; i += MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE) - { - if ((*MSDOS_DIR_NAME(fs_info->cl_buf + i)) == - MSDOS_THIS_DIR_ENTRY_AND_REST_EMPTY) - { - rtems_semaphore_release(fs_info->vol_sema); - return cmpltd; - } - - if ((*MSDOS_DIR_NAME(fs_info->cl_buf + i)) == - MSDOS_THIS_DIR_ENTRY_EMPTY) - continue; - - /* - * skip active entries until get the entry to start from - */ - if (start) - { - start--; - continue; - } - - /* - * Move the entry to the return buffer - * - * unfortunately there is no method to extract ino except to - * open fat-file descriptor :( ... so, open it - */ - - /* get number of cluster we are working with */ - rc = fat_file_ioctl(iop->pathinfo.mt_entry, fat_fd, F_CLU_NUM, - j * bts2rd, &cur_cln); - if (rc != RC_OK) - { - rtems_semaphore_release(fs_info->vol_sema); - return rc; - } - - rc = fat_file_open(iop->pathinfo.mt_entry, cur_cln, i, - &tmp_fat_fd); - if (rc != RC_OK) - { - rtems_semaphore_release(fs_info->vol_sema); - return rc; - } - - tmp_fat_fd->info_cln = cur_cln; - tmp_fat_fd->info_ofs = i; - - /* fill in dirent structure */ - /* XXX: from what and in what d_off should be computed ?! */ - tmp_dirent.d_off = start + cmpltd; - tmp_dirent.d_reclen = sizeof(struct dirent); - tmp_dirent.d_ino = tmp_fat_fd->ino; - tmp_dirent.d_namlen = MSDOS_SHORT_NAME_LEN; - memcpy(tmp_dirent.d_name, MSDOS_DIR_NAME((fs_info->cl_buf + i)), - MSDOS_SHORT_NAME_LEN); - - /* d_name is null-terminated */ - tmp_dirent.d_name[MSDOS_SHORT_NAME_LEN] = 0; - memcpy(buffer + cmpltd, &tmp_dirent, sizeof(struct dirent)); - - iop->offset = iop->offset + sizeof(struct dirent); - cmpltd += (sizeof(struct dirent)); - count -= (sizeof(struct dirent)); - - /* inode number extracted, close fat-file */ - rc = fat_file_close(iop->pathinfo.mt_entry, tmp_fat_fd); - if (rc != RC_OK) - { - rtems_semaphore_release(fs_info->vol_sema); - return rc; - } - - if (count <= 0) - break; - } - j++; - } - - rtems_semaphore_release(fs_info->vol_sema); - return cmpltd; -} - -/* msdos_dir_write -- - * no write for directory - */ - -/* msdos_dir_lseek -- - * - * This routine will behave in one of three ways based on the state of - * argument whence. Based on the state of its value the offset argument will - * be interpreted using one of the following methods: - * - * SEEK_SET - offset is the absolute byte offset from the start of the - * logical start of the dirent sequence that represents the - * directory - * SEEK_CUR - offset is used as the relative byte offset from the current - * directory position index held in the iop structure - * SEEK_END - N/A --> This will cause an assert. - * - * PARAMETERS: - * iop - file control block - * offset - offset - * whence - predefine directive - * - * RETURNS: - * RC_OK on success, or -1 if error occured (errno - * set apropriately). - */ -int -msdos_dir_lseek(rtems_libio_t *iop, off_t offset, int whence) -{ - switch (whence) - { - case SEEK_SET: - case SEEK_CUR: - break; - /* - * Movement past the end of the directory via lseek is not a - * permitted operation - */ - case SEEK_END: - default: - set_errno_and_return_minus_one( EINVAL ); - break; - } - return RC_OK; -} - -/* msdos_dir_stat -- - * - * This routine will obtain the following information concerning the current - * directory: - * st_dev device id - * st_ino node serial number :) - * st_mode mode extracted from the node - * st_size total size in bytes - * st_blksize blocksize for filesystem I/O - * st_blocks number of blocks allocated - * stat_mtime time of last modification - * - * PARAMETERS: - * loc - this directory - * buf - stat buffer provided by user - * - * RETURNS: - * RC_OK and filled stat buffer on success, or -1 if error occured (errno - * set apropriately). - */ -int -msdos_dir_stat( - rtems_filesystem_location_info_t *loc, - struct stat *buf - ) -{ - rtems_status_code sc = RTEMS_SUCCESSFUL; - msdos_fs_info_t *fs_info = loc->mt_entry->fs_info; - fat_file_fd_t *fat_fd = loc->node_access; - - sc = rtems_semaphore_obtain(fs_info->vol_sema, RTEMS_WAIT, - MSDOS_VOLUME_SEMAPHORE_TIMEOUT); - if (sc != RTEMS_SUCCESSFUL) - set_errno_and_return_minus_one(EIO); - - buf->st_dev = fs_info->fat.vol.dev; - buf->st_ino = fat_fd->ino; - buf->st_mode = S_IFDIR; - buf->st_rdev = 0ll; - buf->st_size = fat_fd->fat_file_size; - buf->st_blocks = fat_fd->fat_file_size >> FAT_SECTOR512_BITS; - buf->st_blksize = fs_info->fat.vol.bps; - buf->st_mtime = fat_fd->mtime; - - rtems_semaphore_release(fs_info->vol_sema); - return RC_OK; -} - -/* msdos_dir_truncate -- - * No truncate for directory. - * - * PARAMETERS: - * - * RETURNS: - * - */ - -/* msdos_dir_sync -- - * The following routine does a syncronization on a MSDOS directory node. - * DIR_WrtTime, DIR_WrtDate and DIR_fileSize fields of 32 Bytes Directory - * Entry Structure(see M$ White Paper) should not be updated for - * directories, so only call to corresponding fat-file routine. - * - * PARAMETERS: - * iop - file control block - * - * RETURNS: - * RC_OK on success, or -1 if error occured (errno set apropriately). - */ -int -msdos_dir_sync(rtems_libio_t *iop) -{ - int rc = RC_OK; - rtems_status_code sc = RTEMS_SUCCESSFUL; - fat_file_fd_t *fat_fd = iop->file_info; - msdos_fs_info_t *fs_info = iop->pathinfo.mt_entry->fs_info; - - sc = rtems_semaphore_obtain(fs_info->vol_sema, RTEMS_WAIT, - MSDOS_VOLUME_SEMAPHORE_TIMEOUT); - if (sc != RTEMS_SUCCESSFUL) - set_errno_and_return_minus_one(EIO); - - rc = fat_file_datasync(iop->pathinfo.mt_entry, fat_fd); - - rtems_semaphore_release(fs_info->vol_sema); - return rc; -} - -/* msdos_dir_rmnod -- - * Remove directory node. - * - * Check that this directory node is not opened as fat-file, is empty and - * not filesystem root node. If all this conditions met then delete. - * - * PARAMETERS: - * pathloc - node description - * - * RETURNS: - * RC_OK on success, or -1 if error occured (errno set apropriately). - */ -int -msdos_dir_rmnod(rtems_filesystem_location_info_t *pathloc) -{ - int rc = RC_OK; - rtems_status_code sc = RTEMS_SUCCESSFUL; - msdos_fs_info_t *fs_info = pathloc->mt_entry->fs_info; - fat_file_fd_t *fat_fd = pathloc->node_access; - rtems_boolean is_empty = FALSE; - - sc = rtems_semaphore_obtain(fs_info->vol_sema, RTEMS_WAIT, - MSDOS_VOLUME_SEMAPHORE_TIMEOUT); - if (sc != RTEMS_SUCCESSFUL) - set_errno_and_return_minus_one(EIO); - - /* - * We deny attemp to delete open directory (if directory is current - * directory we assume it is open one) - */ - if (fat_fd->links_num > 1) - { - rtems_semaphore_release(fs_info->vol_sema); - set_errno_and_return_minus_one(EBUSY); - } - - /* - * You cannot remove a node that still has children - */ - rc = msdos_dir_is_empty(pathloc->mt_entry, fat_fd, &is_empty); - if (rc != RC_OK) - { - rtems_semaphore_release(fs_info->vol_sema); - return rc; - } - - if (!is_empty) - { - rtems_semaphore_release(fs_info->vol_sema); - set_errno_and_return_minus_one(ENOTEMPTY); - } - - /* - * You cannot remove the file system root node. - */ - if (pathloc->mt_entry->mt_fs_root.node_access == pathloc->node_access) - { - rtems_semaphore_release(fs_info->vol_sema); - set_errno_and_return_minus_one(EBUSY); - } - - /* - * You cannot remove a mountpoint. - * not used - mount() not implemenetd yet. - */ - - /* mark file removed */ - rc = msdos_set_first_char4file_name(pathloc->mt_entry, fat_fd->info_cln, - fat_fd->info_ofs, - MSDOS_THIS_DIR_ENTRY_EMPTY); - if (rc != RC_OK) - { - rtems_semaphore_release(fs_info->vol_sema); - return rc; - } - - fat_file_mark_removed(pathloc->mt_entry, fat_fd); - - rtems_semaphore_release(fs_info->vol_sema); - return rc; -} |