/*
* MSDOS file 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.rtems.com/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <errno.h>
#include <rtems.h>
#include <rtems/libio.h>
#include <rtems/libio_.h>
#include "fat.h"
#include "fat_fat_operations.h"
#include "fat_file.h"
#include "msdos.h"
static int
msdos_file_update(rtems_libio_t *iop)
{
int rc = RC_OK;
fat_file_fd_t *fat_fd = iop->pathinfo.node_access;
/*
* if fat-file descriptor is not marked as "removed", synchronize
* size, first cluster number, write time and date fields of the file
*/
if (!FAT_FILE_IS_REMOVED(fat_fd))
{
rc = msdos_set_first_cluster_num(iop->pathinfo.mt_entry, fat_fd);
if (rc != RC_OK)
{
return rc;
}
rc = msdos_set_file_size(iop->pathinfo.mt_entry, fat_fd);
if (rc != RC_OK)
{
return rc;
}
rc = msdos_set_dir_wrt_time_and_date(iop->pathinfo.mt_entry, fat_fd);
if (rc != RC_OK)
{
return rc;
}
}
return rc;
}
/* msdos_file_close --
* Close fat-file which correspondes to the file. If fat-file descriptor
* which correspondes to the file is not marked "removed", synchronize
* size, first cluster number, write time and date fields of the file.
*
* PARAMETERS:
* iop - file control block
*
* RETURNS:
* RC_OK, if file closed successfully, or -1 if error occured (errno set
* appropriately)
*/
int
msdos_file_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;
sc = rtems_semaphore_obtain(fs_info->vol_sema, RTEMS_WAIT,
MSDOS_VOLUME_SEMAPHORE_TIMEOUT);
if (sc != RTEMS_SUCCESSFUL)
rtems_set_errno_and_return_minus_one(EIO);
rc = msdos_file_update(iop);
rtems_semaphore_release(fs_info->vol_sema);
return rc;
}
/* msdos_file_read --
* This routine read from file pointed to by file control block into
* the specified data buffer provided by user
*
* PARAMETERS:
* iop - file control block
* buffer - buffer provided by user
* count - the number of bytes to read
*
* RETURNS:
* the number of bytes read on success, or -1 if error occured (errno set
* appropriately)
*/
ssize_t
msdos_file_read(rtems_libio_t *iop, void *buffer, size_t count)
{
ssize_t ret = 0;
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->pathinfo.node_access;
sc = rtems_semaphore_obtain(fs_info->vol_sema, RTEMS_WAIT,
MSDOS_VOLUME_SEMAPHORE_TIMEOUT);
if (sc != RTEMS_SUCCESSFUL)
rtems_set_errno_and_return_minus_one(EIO);
ret = fat_file_read(iop->pathinfo.mt_entry, fat_fd, iop->offset, count,
buffer);
if (ret > 0)
iop->offset += ret;
rtems_semaphore_release(fs_info->vol_sema);
return ret;
}
/* msdos_file_write --
* This routine writes the specified data buffer into the file pointed to
* by file control block.
*
* PARAMETERS:
* iop - file control block
* buffer - data to write
* count - count of bytes to write
*
* RETURNS:
* the number of bytes written on success, or -1 if error occured
* and errno set appropriately
*/
ssize_t
msdos_file_write(rtems_libio_t *iop,const void *buffer, size_t count)
{
ssize_t ret = 0;
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->pathinfo.node_access;
sc = rtems_semaphore_obtain(fs_info->vol_sema, RTEMS_WAIT,
MSDOS_VOLUME_SEMAPHORE_TIMEOUT);
if (sc != RTEMS_SUCCESSFUL)
rtems_set_errno_and_return_minus_one(EIO);
if ((iop->flags & LIBIO_FLAGS_APPEND) != 0)
iop->offset = fat_fd->fat_file_size;
ret = fat_file_write(iop->pathinfo.mt_entry, fat_fd, iop->offset, count,
buffer);
if (ret < 0)
{
rtems_semaphore_release(fs_info->vol_sema);
return -1;
}
/*
* update file size in both fat-file descriptor and file control block if
* file was extended
*/
iop->offset += ret;
if (iop->offset > fat_fd->fat_file_size)
fat_fd->fat_file_size = iop->offset;
rtems_semaphore_release(fs_info->vol_sema);
return ret;
}
/* msdos_file_stat --
*
* PARAMETERS:
* loc - node description
* buf - stat buffer provided by user
*
* RETURNS:
* RC_OK on success, or -1 if error occured (errno set appropriately)
*/
int
msdos_file_stat(
const 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)
rtems_set_errno_and_return_minus_one(EIO);
buf->st_dev = rtems_disk_get_device_identifier(fs_info->fat.vol.dd);
buf->st_ino = fat_fd->ino;
buf->st_mode = S_IFREG | S_IRWXU | S_IRWXG | S_IRWXO;
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_file_ftruncate --
* Truncate the file.
*
* PARAMETERS:
* iop - file control block
* length - new length
*
* RETURNS:
* RC_OK on success, or -1 if error occured (errno set appropriately).
*/
int
msdos_file_ftruncate(rtems_libio_t *iop, off_t length)
{
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->pathinfo.node_access;
uint32_t old_length;
sc = rtems_semaphore_obtain(fs_info->vol_sema, RTEMS_WAIT,
MSDOS_VOLUME_SEMAPHORE_TIMEOUT);
if (sc != RTEMS_SUCCESSFUL)
rtems_set_errno_and_return_minus_one(EIO);
old_length = fat_fd->fat_file_size;
if (length < old_length) {
rc = fat_file_truncate(iop->pathinfo.mt_entry, fat_fd, length);
} else {
uint32_t new_length;
rc = fat_file_extend(iop->pathinfo.mt_entry,
fat_fd,
true,
length,
&new_length);
if (rc == RC_OK && length != new_length) {
fat_file_truncate(iop->pathinfo.mt_entry, fat_fd, old_length);
errno = ENOSPC;
rc = -1;
}
}
if (rc == RC_OK) {
fat_fd->fat_file_size = length;
}
rtems_semaphore_release(fs_info->vol_sema);
return rc;
}
/* msdos_file_sync --
* Synchronize file - synchronize file data and if file is not removed
* synchronize file metadata.
*
* PARAMETERS:
* iop - file control block
*
* RETURNS:
* RC_OK on success, or -1 if error occured (errno set appropriately)
*/
int
msdos_file_sync(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;
sc = rtems_semaphore_obtain(fs_info->vol_sema, RTEMS_WAIT,
MSDOS_VOLUME_SEMAPHORE_TIMEOUT);
if (sc != RTEMS_SUCCESSFUL)
rtems_set_errno_and_return_minus_one(EIO);
rc = msdos_file_update(iop);
if (rc != RC_OK)
{
rtems_semaphore_release(fs_info->vol_sema);
return rc;
}
rc = msdos_sync_unprotected(fs_info);
rtems_semaphore_release(fs_info->vol_sema);
return RC_OK;
}
