mirror of
https://github.com/wiidev/usbloadergx.git
synced 2024-09-09 09:03:20 +02:00
648 lines
18 KiB
C
648 lines
18 KiB
C
/**
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* gekko_io.c - Gekko style disk io functions.
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*
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* Copyright (c) 2009 Rhys "Shareese" Koedijk
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* Copyright (c) 2010 Dimok
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*
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* This program/include file is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program/include file is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_STDIO_H
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#include <stdio.h>
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#endif
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#ifdef HAVE_MATH_H
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#include <math.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#ifdef HAVE_LIMITS_H
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#include <limits.h>
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#endif
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#ifdef HAVE_LOCALE_H
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#include <locale.h>
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#endif
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#include "ntfs.h"
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#include "types.h"
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#include "logging.h"
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#include "device_io.h"
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#include "gekko_io.h"
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#include "cache.h"
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#include "device.h"
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#include "bootsect.h"
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#define DEV_FD(dev) ((gekko_fd *)dev->d_private)
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/* Prototypes */
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static s64 ntfs_device_gekko_io_readbytes(struct ntfs_device *dev, s64 offset, s64 count, void *buf);
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static bool ntfs_device_gekko_io_readsectors(struct ntfs_device *dev, sec_t sector, sec_t numSectors, void* buffer);
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static s64 ntfs_device_gekko_io_writebytes(struct ntfs_device *dev, s64 offset, s64 count, const void *buf);
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static bool ntfs_device_gekko_io_writesectors(struct ntfs_device *dev, sec_t sector, sec_t numSectors, const void* buffer);
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/**
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*
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*/
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static int ntfs_device_gekko_io_open(struct ntfs_device *dev, int flags)
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{
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ntfs_log_trace("dev %p, flags %i\n", dev, flags);
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// Get the device driver descriptor
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gekko_fd *fd = DEV_FD(dev);
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if (!fd) {
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errno = EBADF;
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return -1;
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}
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// Get the device interface
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const DISC_INTERFACE* interface = fd->interface;
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if (!interface) {
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errno = ENODEV;
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return -1;
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}
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// Start the device interface and ensure that it is inserted
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if (!interface->startup()) {
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ntfs_log_perror("device failed to start\n");
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errno = EIO;
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return -1;
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}
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if (!interface->isInserted()) {
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ntfs_log_perror("device media is not inserted\n");
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errno = EIO;
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return -1;
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}
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// Check that the device isn't already open (used by another volume?)
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if (NDevOpen(dev)) {
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ntfs_log_perror("device is busy (already open)\n");
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errno = EBUSY;
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return -1;
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}
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// Check that there is a valid NTFS boot sector at the start of the device
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NTFS_BOOT_SECTOR boot;
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if (interface->readSectors(fd->startSector, 1, &boot)) {
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if (!ntfs_boot_sector_is_ntfs(&boot)) {
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errno = EINVALPART;
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return -1;
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}
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} else {
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ntfs_log_perror("read failure @ sector %d\n", fd->startSector);
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errno = EIO;
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return -1;
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}
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// Parse the boot sector
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fd->hiddenSectors = le32_to_cpu(boot.bpb.hidden_sectors);
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fd->sectorSize = le16_to_cpu(boot.bpb.bytes_per_sector);
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fd->sectorCount = sle64_to_cpu(boot.number_of_sectors);
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fd->pos = 0;
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fd->len = (fd->sectorCount * fd->sectorSize);
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fd->ino = le64_to_cpu(boot.volume_serial_number);
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// If the device sector size is not 512 bytes then we cannot continue,
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// gekko disc I/O works on the assumption that sectors are always 512 bytes long.
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// TODO: Implement support for non-512 byte sector sizes through some fancy maths!?
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if (fd->sectorSize != BYTES_PER_SECTOR) {
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ntfs_log_error("Boot sector claims there is %i bytes per sector; expected %i\n", fd->sectorSize, BYTES_PER_SECTOR);
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errno = EIO;
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return -1;
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}
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// Mark the device as read-only (if required)
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if (flags & O_RDONLY) {
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NDevSetReadOnly(dev);
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}
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// Create the cache
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fd->cache = _NTFS_cache_constructor(fd->cachePageCount, fd->cachePageSize, interface, fd->startSector + fd->sectorCount);
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// Mark the device as open
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NDevSetBlock(dev);
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NDevSetOpen(dev);
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return 0;
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}
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/**
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*
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*/
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static int ntfs_device_gekko_io_close(struct ntfs_device *dev)
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{
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ntfs_log_trace("dev %p\n", dev);
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// Get the device driver descriptor
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gekko_fd *fd = DEV_FD(dev);
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if (!fd) {
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errno = EBADF;
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return -1;
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}
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// Check that the device is actually open
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if (!NDevOpen(dev)) {
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ntfs_log_perror("device is not open\n");
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errno = EIO;
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return -1;
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}
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// Mark the device as closed
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NDevClearOpen(dev);
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NDevClearBlock(dev);
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// Flush the device (if dirty and not read-only)
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if (NDevDirty(dev) && !NDevReadOnly(dev)) {
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ntfs_log_debug("device is dirty, will now sync\n");
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// ...?
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// Mark the device as clean
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NDevClearDirty(dev);
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}
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// Flush and destroy the cache (if required)
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if (fd->cache) {
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_NTFS_cache_flush(fd->cache);
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_NTFS_cache_destructor(fd->cache);
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}
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// Shutdown the device interface
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/*const DISC_INTERFACE* interface = fd->interface;
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if (interface) {
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interface->shutdown();
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}*/
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// Free the device driver private data
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ntfs_free(dev->d_private);
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dev->d_private = NULL;
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return 0;
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}
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/**
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*
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*/
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static s64 ntfs_device_gekko_io_seek(struct ntfs_device *dev, s64 offset, int whence)
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{
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ntfs_log_trace("dev %p, offset %Li, whence %i\n", dev, offset, whence);
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// Get the device driver descriptor
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gekko_fd *fd = DEV_FD(dev);
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if (!fd) {
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errno = EBADF;
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return -1;
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}
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// Set the current position on the device (in bytes)
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switch(whence) {
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case SEEK_SET: fd->pos = MIN(MAX(offset, 0), fd->len); break;
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case SEEK_CUR: fd->pos = MIN(MAX(fd->pos + offset, 0), fd->len); break;
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case SEEK_END: fd->pos = MIN(MAX(fd->len + offset, 0), fd->len); break;
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}
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return 0;
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}
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/**
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*
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*/
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static s64 ntfs_device_gekko_io_read(struct ntfs_device *dev, void *buf, s64 count)
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{
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return ntfs_device_gekko_io_readbytes(dev, DEV_FD(dev)->pos, count, buf);
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}
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/**
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*
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*/
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static s64 ntfs_device_gekko_io_write(struct ntfs_device *dev, const void *buf, s64 count)
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{
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return ntfs_device_gekko_io_writebytes(dev, DEV_FD(dev)->pos, count, buf);
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}
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/**
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*
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*/
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static s64 ntfs_device_gekko_io_pread(struct ntfs_device *dev, void *buf, s64 count, s64 offset)
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{
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return ntfs_device_gekko_io_readbytes(dev, offset, count, buf);
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}
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/**
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*
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*/
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static s64 ntfs_device_gekko_io_pwrite(struct ntfs_device *dev, const void *buf, s64 count, s64 offset)
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{
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return ntfs_device_gekko_io_writebytes(dev, offset, count, buf);
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}
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/**
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*
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*/
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static s64 ntfs_device_gekko_io_readbytes(struct ntfs_device *dev, s64 offset, s64 count, void *buf)
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{
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ntfs_log_trace("dev %p, offset %Li, count %Li\n", dev, offset, count);
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// Get the device driver descriptor
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gekko_fd *fd = DEV_FD(dev);
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if (!fd) {
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errno = EBADF;
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return -1;
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}
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// Get the device interface
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const DISC_INTERFACE* interface = fd->interface;
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if (!interface) {
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errno = ENODEV;
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return -1;
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}
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if(!count)
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return 0;
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sec_t sec_start = (sec_t) fd->startSector;
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sec_t sec_count = 1;
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u32 buffer_offset = 0;
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u8 *buffer = NULL;
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// Determine the range of sectors required for this read
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if (offset > 0) {
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sec_start += (sec_t) floor((f64) offset/fd->sectorSize);
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buffer_offset = (u32) (offset % fd->sectorSize);
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}
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if (count > fd->sectorSize) {
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sec_count = (sec_t) ceil((f64) count/fd->sectorSize);
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if(buffer_offset > 0)
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sec_count += 1;
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}
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// If this read happens to be on the sector boundaries then do the read straight into the destination buffer
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if((offset % fd->sectorSize == 0) && (count % fd->sectorSize == 0)) {
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// Read from the device
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ntfs_log_trace("direct read from sector %d (%d sector(s) long)\n", sec_start, sec_count);
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if (!ntfs_device_gekko_io_readsectors(dev, sec_start, sec_count, buf)) {
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ntfs_log_perror("direct read failure @ sector %d (%d sector(s) long)\n", sec_start, sec_count);
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errno = EIO;
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return -1;
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}
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// Else read into a buffer and copy over only what was requested
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}
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else
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{
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// Allocate a buffer to hold the read data
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buffer = (u8*)ntfs_alloc(sec_count * fd->sectorSize);
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if (!buffer) {
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errno = ENOMEM;
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return -1;
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}
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// Read from the device
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ntfs_log_trace("buffered read from sector %d (%d sector(s) long)\n", sec_start, sec_count);
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ntfs_log_trace("count: %d sec_count:%d fd->sectorSize: %d )\n", (u32)count, (u32)sec_count,(u32)fd->sectorSize);
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if (!ntfs_device_gekko_io_readsectors(dev, sec_start, sec_count, buffer)) {
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ntfs_log_perror("buffered read failure @ sector %d (%d sector(s) long)\n", sec_start, sec_count);
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ntfs_free(buffer);
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errno = EIO;
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return -1;
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}
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// Copy what was requested to the destination buffer
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memcpy(buf, buffer + buffer_offset, count);
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ntfs_free(buffer);
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}
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return count;
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}
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/**
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*
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*/
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static s64 ntfs_device_gekko_io_writebytes(struct ntfs_device *dev, s64 offset, s64 count, const void *buf)
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{
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ntfs_log_trace("dev %p, offset %lli, count %lli\n", dev, offset, count);
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// Get the device driver descriptor
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gekko_fd *fd = DEV_FD(dev);
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if (!fd) {
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errno = EBADF;
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return -1;
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}
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// Get the device interface
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const DISC_INTERFACE* interface = fd->interface;
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if (!interface) {
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errno = ENODEV;
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return -1;
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}
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// Check that the device can be written to
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if (NDevReadOnly(dev)) {
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errno = EROFS;
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return -1;
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}
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if(!count)
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return 0;
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sec_t sec_start = (sec_t) fd->startSector;
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sec_t sec_count = 1;
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u32 buffer_offset = 0;
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u8 *buffer = NULL;
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// Determine the range of sectors required for this write
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if (offset > 0) {
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sec_start += (sec_t) floor((f64) offset/fd->sectorSize);
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buffer_offset = (u32) (offset % fd->sectorSize);
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}
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if (count > fd->sectorSize) {
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sec_count = (sec_t) ceil((f64) count/fd->sectorSize);
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if(buffer_offset > 0)
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sec_count += 1;
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}
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// If this write happens to be on the sector boundaries then do the write straight to disc
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if((offset % fd->sectorSize == 0) && (count % fd->sectorSize == 0)) {
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// Write to the device
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ntfs_log_trace("direct write to sector %d (%d sector(s) long)\n", sec_start, sec_count);
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if (!ntfs_device_gekko_io_writesectors(dev, sec_start, sec_count, buf)) {
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ntfs_log_perror("direct write failure @ sector %d (%d sector(s) long)\n", sec_start, sec_count);
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errno = EIO;
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return -1;
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}
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// Else write from a buffer aligned to the sector boundaries
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} else {
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// Allocate a buffer to hold the write data
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buffer = (u8 *) ntfs_alloc(sec_count * fd->sectorSize);
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if (!buffer) {
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errno = ENOMEM;
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return -1;
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}
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// Read the first and last sectors of the buffer from disc (if required)
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// NOTE: This is done because the data does not line up with the sector boundaries,
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// we just read in the buffer edges where the data overlaps with the rest of the disc
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if (!ntfs_device_gekko_io_readsectors(dev, sec_start, sec_count, buffer)) {
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ntfs_log_perror("read failure @ sector %d\n", sec_start);
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ntfs_free(buffer);
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errno = EIO;
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return -1;
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}
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// Copy the data into the write buffer
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memcpy(buffer + buffer_offset, buf, count);
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// Write to the device
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ntfs_log_trace("buffered write to sector %d (%d sector(s) long)\n", sec_start, sec_count);
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if (!ntfs_device_gekko_io_writesectors(dev, sec_start, sec_count, buffer)) {
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ntfs_log_perror("buffered write failure @ sector %d\n", sec_start);
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ntfs_free(buffer);
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errno = EIO;
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return -1;
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}
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// Free the buffer
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ntfs_free(buffer);
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}
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// Mark the device as dirty (if we actually wrote anything)
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if (count > 0)
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NDevSetDirty(dev);
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return count;
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}
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static bool ntfs_device_gekko_io_readsectors(struct ntfs_device *dev, sec_t sector, sec_t numSectors, void* buffer)
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{
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// Get the device driver descriptor
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gekko_fd *fd = DEV_FD(dev);
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if (!fd) {
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errno = EBADF;
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return false;
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}
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// Read the sectors from disc (or cache, if enabled)
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if (fd->cache)
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return _NTFS_cache_readSectors(fd->cache, sector, numSectors, buffer);
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else
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return fd->interface->readSectors(sector, numSectors, buffer);
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return false;
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}
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static bool ntfs_device_gekko_io_writesectors(struct ntfs_device *dev, sec_t sector, sec_t numSectors, const void* buffer)
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{
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// Get the device driver descriptor
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gekko_fd *fd = DEV_FD(dev);
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if (!fd) {
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errno = EBADF;
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return false;
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}
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// Write the sectors to disc (or cache, if enabled)
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if (fd->cache)
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return _NTFS_cache_writeSectors(fd->cache, sector, numSectors, buffer);
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else
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return fd->interface->writeSectors(sector, numSectors, buffer);
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return false;
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}
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/**
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*
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*/
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static int ntfs_device_gekko_io_sync(struct ntfs_device *dev)
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{
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gekko_fd *fd = DEV_FD(dev);
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ntfs_log_trace("dev %p\n", dev);
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// Check that the device can be written to
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if (NDevReadOnly(dev)) {
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errno = EROFS;
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return -1;
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}
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// Mark the device as clean
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NDevClearDirty(dev);
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// Flush any sectors in the disc cache (if required)
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if (fd->cache) {
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if (!_NTFS_cache_flush(fd->cache)) {
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errno = EIO;
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return -1;
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}
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}
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return 0;
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}
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/**
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*
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*/
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static int ntfs_device_gekko_io_stat(struct ntfs_device *dev, struct stat *buf)
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{
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ntfs_log_trace("dev %p, buf %p\n", dev, buf);
|
|
|
|
// Get the device driver descriptor
|
|
gekko_fd *fd = DEV_FD(dev);
|
|
if (!fd) {
|
|
errno = EBADF;
|
|
return -1;
|
|
}
|
|
|
|
// Short circuit cases were we don't actually have to do anything
|
|
if (!buf)
|
|
return 0;
|
|
|
|
// Build the device mode
|
|
mode_t mode = (S_IFBLK) |
|
|
(S_IRUSR | S_IRGRP | S_IROTH) |
|
|
((!NDevReadOnly(dev)) ? (S_IWUSR | S_IWGRP | S_IWOTH) : 0);
|
|
|
|
// Zero out the stat buffer
|
|
memset(buf, 0, sizeof(struct stat));
|
|
|
|
// Build the device stats
|
|
buf->st_dev = fd->interface->ioType;
|
|
buf->st_ino = fd->ino;
|
|
buf->st_mode = mode;
|
|
buf->st_rdev = fd->interface->ioType;
|
|
buf->st_blksize = fd->sectorSize;
|
|
buf->st_blocks = fd->sectorCount;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
*
|
|
*/
|
|
static int ntfs_device_gekko_io_ioctl(struct ntfs_device *dev, int request, void *argp)
|
|
{
|
|
ntfs_log_trace("dev %p, request %i, argp %p\n", dev, request, argp);
|
|
|
|
// Get the device driver descriptor
|
|
gekko_fd *fd = DEV_FD(dev);
|
|
if (!fd) {
|
|
errno = EBADF;
|
|
return -1;
|
|
}
|
|
|
|
// Figure out which i/o control was requested
|
|
switch (request) {
|
|
|
|
// Get block device size (sectors)
|
|
#if defined(BLKGETSIZE)
|
|
case BLKGETSIZE: {
|
|
*(u32*)argp = fd->sectorCount;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
// Get block device size (bytes)
|
|
#if defined(BLKGETSIZE64)
|
|
case BLKGETSIZE64: {
|
|
*(u64*)argp = (fd->sectorCount * fd->sectorSize);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
// Get hard drive geometry
|
|
#if defined(HDIO_GETGEO)
|
|
case HDIO_GETGEO: {
|
|
struct hd_geometry *geo = (struct hd_geometry*)argp;
|
|
geo->sectors = 0;
|
|
geo->heads = 0;
|
|
geo->cylinders = 0;
|
|
geo->start = fd->hiddenSectors;
|
|
return -1;
|
|
}
|
|
#endif
|
|
|
|
// Get block device sector size (bytes)
|
|
#if defined(BLKSSZGET)
|
|
case BLKSSZGET: {
|
|
*(int*)argp = fd->sectorSize;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
// Set block device block size (bytes)
|
|
#if defined(BLKBSZSET)
|
|
case BLKBSZSET: {
|
|
int sectorSize = *(int*)argp;
|
|
if (sectorSize != BYTES_PER_SECTOR) {
|
|
ntfs_log_perror("Attempt to set sector size to an unsupported value (%i), ignored\n", sectorSize);
|
|
errno = EOPNOTSUPP;
|
|
return -1;
|
|
}
|
|
fd->sectorSize = sectorSize;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
// Unimplemented ioctrl
|
|
default: {
|
|
ntfs_log_perror("Unimplemented ioctrl %i\n", request);
|
|
errno = EOPNOTSUPP;
|
|
return -1;
|
|
}
|
|
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Device operations for working with gekko style devices and files.
|
|
*/
|
|
struct ntfs_device_operations ntfs_device_gekko_io_ops = {
|
|
.open = ntfs_device_gekko_io_open,
|
|
.close = ntfs_device_gekko_io_close,
|
|
.seek = ntfs_device_gekko_io_seek,
|
|
.read = ntfs_device_gekko_io_read,
|
|
.write = ntfs_device_gekko_io_write,
|
|
.pread = ntfs_device_gekko_io_pread,
|
|
.pwrite = ntfs_device_gekko_io_pwrite,
|
|
.sync = ntfs_device_gekko_io_sync,
|
|
.stat = ntfs_device_gekko_io_stat,
|
|
.ioctl = ntfs_device_gekko_io_ioctl,
|
|
};
|