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libiosuhax/source/iosuhax_devoptab.c

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/***************************************************************************
* Copyright (C) 2015
* by Dimok
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any
* damages arising from the use of this software.
*
* Permission is granted to anyone to use this software for any
* purpose, including commercial applications, and to alter it and
* redistribute it freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you
* must not claim that you wrote the original software. If you use
* this software in a product, an acknowledgment in the product
* documentation would be appreciated but is not required.
*
* 2. Altered source versions must be plainly marked as such, and
* must not be misrepresented as being the original software.
*
* 3. This notice may not be removed or altered from any source
* distribution.
***************************************************************************/
#include <errno.h>
#include <sys/iosupport.h>
#include <sys/statvfs.h>
#include <sys/dirent.h>
#include <string.h>
#include <malloc.h>
#include <stdint.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/iosupport.h>
#include "os_functions.h"
#include "iosuhax.h"
typedef struct _fs_dev_private_t {
char *mount_path;
int fsaFd;
int mounted;
void *pMutex;
} fs_dev_private_t;
typedef struct _fs_dev_file_state_t {
fs_dev_private_t *dev;
int fd; /* File descriptor */
int flags; /* Opening flags */
int read; /* True if allowed to read from file */
int write; /* True if allowed to write to file */
int append; /* True if allowed to append to file */
uint32_t pos; /* Current position within the file (in bytes) */
uint32_t len; /* Total length of the file (in bytes) */
struct _fs_dev_file_state_t *prevOpenFile; /* The previous entry in a double-linked FILO list of open files */
struct _fs_dev_file_state_t *nextOpenFile; /* The next entry in a double-linked FILO list of open files */
} fs_dev_file_state_t;
typedef struct _fs_dev_dir_entry_t {
fs_dev_private_t *dev;
int dirHandle;
} fs_dev_dir_entry_t;
static fs_dev_private_t *fs_dev_get_device_data(const char *path)
{
const devoptab_t *devoptab = NULL;
char name[128] = {0};
int i;
// Get the device name from the path
strncpy(name, path, 127);
strtok(name, ":/");
// Search the devoptab table for the specified device name
// NOTE: We do this manually due to a 'bug' in GetDeviceOpTab
// which ignores names with suffixes and causes names
// like "ntfs" and "ntfs1" to be seen as equals
for (i = 3; i < STD_MAX; i++) {
devoptab = devoptab_list[i];
if (devoptab && devoptab->name) {
if (strcmp(name, devoptab->name) == 0) {
return (fs_dev_private_t *)devoptab->deviceData;
}
}
}
return NULL;
}
static char *fs_dev_real_path (const char *path, fs_dev_private_t *dev)
{
// Sanity check
if (!path)
return NULL;
// Move the path pointer to the start of the actual path
if (strchr(path, ':') != NULL) {
path = strchr(path, ':') + 1;
}
int mount_len = strlen(dev->mount_path);
char *new_name = (char*)malloc(mount_len + strlen(path) + 1);
if(new_name) {
strcpy(new_name, dev->mount_path);
strcpy(new_name + mount_len, path);
return new_name;
}
return new_name;
}
static int fs_dev_open_r (struct _reent *r, void *fileStruct, const char *path, int flags, int mode)
{
fs_dev_private_t *dev = fs_dev_get_device_data(path);
if(!dev) {
r->_errno = ENODEV;
return -1;
}
fs_dev_file_state_t *file = (fs_dev_file_state_t *)fileStruct;
file->dev = dev;
// Determine which mode the file is opened for
file->flags = flags;
const char *mode_str;
if ((flags & 0x03) == O_RDONLY) {
file->read = 1;
file->write = 0;
file->append = 0;
mode_str = "r";
} else if ((flags & 0x03) == O_WRONLY) {
file->read = 0;
file->write = 1;
file->append = (flags & O_APPEND);
mode_str = file->append ? "a" : "w";
} else if ((flags & 0x03) == O_RDWR) {
file->read = 1;
file->write = 1;
file->append = (flags & O_APPEND);
mode_str = file->append ? "a+" : "r+";
} else {
r->_errno = EACCES;
return -1;
}
int fd = -1;
OSLockMutex(dev->pMutex);
char *real_path = fs_dev_real_path(path, dev);
if(!path) {
r->_errno = ENOMEM;
OSUnlockMutex(dev->pMutex);
return -1;
}
int result = IOSUHAX_FSA_OpenFile(dev->fsaFd, real_path, mode_str, &fd);
free(real_path);
if(result == 0)
{
fileStat_s stats;
result = IOSUHAX_FSA_StatFile(dev->fsaFd, fd, &stats);
if(result != 0) {
IOSUHAX_FSA_CloseFile(dev->fsaFd, fd);
r->_errno = result;
OSUnlockMutex(dev->pMutex);
return -1;
}
file->fd = fd;
file->pos = 0;
file->len = stats.size;
OSUnlockMutex(dev->pMutex);
return (int)file;
}
r->_errno = result;
OSUnlockMutex(dev->pMutex);
return -1;
}
static int fs_dev_close_r (struct _reent *r, void *fd)
{
fs_dev_file_state_t *file = (fs_dev_file_state_t *)fd;
if(!file->dev) {
r->_errno = ENODEV;
return -1;
}
OSLockMutex(file->dev->pMutex);
int result = IOSUHAX_FSA_CloseFile(file->dev->fsaFd, file->fd);
OSUnlockMutex(file->dev->pMutex);
if(result < 0)
{
r->_errno = result;
return -1;
}
return 0;
}
static off_t fs_dev_seek_r (struct _reent *r, void *fd, off_t pos, int dir)
{
fs_dev_file_state_t *file = (fs_dev_file_state_t *)fd;
if(!file->dev) {
r->_errno = ENODEV;
return 0;
}
OSLockMutex(file->dev->pMutex);
switch(dir)
{
case SEEK_SET:
file->pos = pos;
break;
case SEEK_CUR:
file->pos += pos;
break;
case SEEK_END:
file->pos = file->len + pos;
break;
default:
r->_errno = EINVAL;
return -1;
}
int result = IOSUHAX_FSA_SetFilePos(file->dev->fsaFd, file->fd, file->pos);
OSUnlockMutex(file->dev->pMutex);
if(result == 0)
{
return file->pos;
}
return result;
}
static ssize_t fs_dev_write_r (struct _reent *r, void *fd, const char *ptr, size_t len)
{
fs_dev_file_state_t *file = (fs_dev_file_state_t *)fd;
if(!file->dev) {
r->_errno = ENODEV;
return 0;
}
if(!file->write)
{
r->_errno = EACCES;
return 0;
}
OSLockMutex(file->dev->pMutex);
size_t done = 0;
while(done < len)
{
size_t write_size = len - done;
int result = IOSUHAX_FSA_WriteFile(file->dev->fsaFd, ptr + done, 0x01, write_size, file->fd, 0);
if(result < 0)
{
r->_errno = result;
break;
}
else if(result == 0)
{
if(write_size > 0)
done = 0;
break;
}
else
{
done += result;
file->pos += result;
}
}
OSUnlockMutex(file->dev->pMutex);
return done;
}
static ssize_t fs_dev_read_r (struct _reent *r, void *fd, char *ptr, size_t len)
{
fs_dev_file_state_t *file = (fs_dev_file_state_t *)fd;
if(!file->dev) {
r->_errno = ENODEV;
return 0;
}
if(!file->read)
{
r->_errno = EACCES;
return 0;
}
OSLockMutex(file->dev->pMutex);
size_t done = 0;
while(done < len)
{
size_t read_size = len - done;
int result = IOSUHAX_FSA_ReadFile(file->dev->fsaFd, ptr + done, 0x01, read_size, file->fd, 0);
if(result < 0)
{
r->_errno = result;
done = 0;
break;
}
else if(result == 0)
{
//! TODO: error on read_size > 0
break;
}
else
{
done += result;
file->pos += result;
}
}
OSUnlockMutex(file->dev->pMutex);
return done;
}
static int fs_dev_fstat_r (struct _reent *r, void *fd, struct stat *st)
{
fs_dev_file_state_t *file = (fs_dev_file_state_t *)fd;
if(!file->dev) {
r->_errno = ENODEV;
return -1;
}
OSLockMutex(file->dev->pMutex);
// Zero out the stat buffer
memset(st, 0, sizeof(struct stat));
fileStat_s stats;
int result = IOSUHAX_FSA_StatFile(file->dev->fsaFd, (int)fd, &stats);
if(result != 0) {
r->_errno = result;
OSUnlockMutex(file->dev->pMutex);
return -1;
}
st->st_mode = S_IFREG;
st->st_size = stats.size;
st->st_blocks = (stats.size + 511) >> 9;
st->st_nlink = 1;
// Fill in the generic entry stats
st->st_dev = stats.id;
st->st_uid = stats.owner_id;
st->st_gid = stats.group_id;
st->st_ino = stats.id;
st->st_atime = stats.mtime;
st->st_ctime = stats.ctime;
st->st_mtime = stats.mtime;
OSUnlockMutex(file->dev->pMutex);
return 0;
}
static int fs_dev_ftruncate_r (struct _reent *r, void *fd, off_t len)
{
fs_dev_file_state_t *file = (fs_dev_file_state_t *)fd;
if(!file->dev) {
r->_errno = ENODEV;
return -1;
}
r->_errno = ENOTSUP;
// TODO
return -1;
}
static int fs_dev_fsync_r (struct _reent *r, void *fd)
{
fs_dev_file_state_t *file = (fs_dev_file_state_t *)fd;
if(!file->dev) {
r->_errno = ENODEV;
return -1;
}
r->_errno = ENOTSUP;
// TODO
return -1;
}
static int fs_dev_stat_r (struct _reent *r, const char *path, struct stat *st)
{
fs_dev_private_t *dev = fs_dev_get_device_data(path);
if(!dev) {
r->_errno = ENODEV;
return -1;
}
OSLockMutex(dev->pMutex);
// Zero out the stat buffer
memset(st, 0, sizeof(struct stat));
char *real_path = fs_dev_real_path(path, dev);
if(!real_path) {
r->_errno = ENOMEM;
OSUnlockMutex(dev->pMutex);
return -1;
}
fileStat_s stats;
int result = IOSUHAX_FSA_GetStat(dev->fsaFd, real_path, &stats);
free(real_path);
if(result < 0) {
r->_errno = result;
OSUnlockMutex(dev->pMutex);
return -1;
}
// mark root also as directory
st->st_mode = ((stats.flag & 0x80000000) || (strlen(dev->mount_path) + 1 == strlen(real_path)))? S_IFDIR : S_IFREG;
st->st_nlink = 1;
st->st_size = stats.size;
st->st_blocks = (stats.size + 511) >> 9;
// Fill in the generic entry stats
st->st_dev = stats.id;
st->st_uid = stats.owner_id;
st->st_gid = stats.group_id;
st->st_ino = stats.id;
st->st_atime = stats.mtime;
st->st_ctime = stats.ctime;
st->st_mtime = stats.mtime;
OSUnlockMutex(dev->pMutex);
return 0;
}
static int fs_dev_link_r (struct _reent *r, const char *existing, const char *newLink)
{
r->_errno = ENOTSUP;
return -1;
}
static int fs_dev_unlink_r (struct _reent *r, const char *name)
{
fs_dev_private_t *dev = fs_dev_get_device_data(name);
if(!dev) {
r->_errno = ENODEV;
return -1;
}
OSLockMutex(dev->pMutex);
char *real_path = fs_dev_real_path(name, dev);
if(!real_path) {
r->_errno = ENOMEM;
OSUnlockMutex(dev->pMutex);
return -1;
}
int result = IOSUHAX_FSA_Remove(dev->fsaFd, real_path);
free(real_path);
OSUnlockMutex(dev->pMutex);
if(result < 0) {
r->_errno = result;
return -1;
}
return result;
}
static int fs_dev_chdir_r (struct _reent *r, const char *name)
{
fs_dev_private_t *dev = fs_dev_get_device_data(name);
if(!dev) {
r->_errno = ENODEV;
return -1;
}
OSLockMutex(dev->pMutex);
char *real_path = fs_dev_real_path(name, dev);
if(!real_path) {
r->_errno = ENOMEM;
OSUnlockMutex(dev->pMutex);
return -1;
}
int result = IOSUHAX_FSA_ChangeDir(dev->fsaFd, real_path);
free(real_path);
OSUnlockMutex(dev->pMutex);
if(result < 0) {
r->_errno = result;
return -1;
}
return 0;
}
static int fs_dev_rename_r (struct _reent *r, const char *oldName, const char *newName)
{
fs_dev_private_t *dev = fs_dev_get_device_data(oldName);
if(!dev) {
r->_errno = ENODEV;
return -1;
}
OSLockMutex(dev->pMutex);
char *real_oldpath = fs_dev_real_path(oldName, dev);
if(!real_oldpath) {
r->_errno = ENOMEM;
OSUnlockMutex(dev->pMutex);
return -1;
}
char *real_newpath = fs_dev_real_path(newName, dev);
if(!real_newpath) {
r->_errno = ENOMEM;
free(real_oldpath);
OSUnlockMutex(dev->pMutex);
return -1;
}
//! TODO
int result = -ENOTSUP;
free(real_oldpath);
free(real_newpath);
OSUnlockMutex(dev->pMutex);
if(result < 0) {
r->_errno = result;
return -1;
}
return 0;
}
static int fs_dev_mkdir_r (struct _reent *r, const char *path, int mode)
{
fs_dev_private_t *dev = fs_dev_get_device_data(path);
if(!dev) {
r->_errno = ENODEV;
return -1;
}
OSLockMutex(dev->pMutex);
char *real_path = fs_dev_real_path(path, dev);
if(!real_path) {
r->_errno = ENOMEM;
OSUnlockMutex(dev->pMutex);
return -1;
}
int result = IOSUHAX_FSA_MakeDir(dev->fsaFd, real_path, mode);
free(real_path);
OSUnlockMutex(dev->pMutex);
if(result < 0) {
r->_errno = result;
return -1;
}
return 0;
}
static int fs_dev_chmod_r (struct _reent *r, const char *path, int mode)
{
fs_dev_private_t *dev = fs_dev_get_device_data(path);
if(!dev) {
r->_errno = ENODEV;
return -1;
}
OSLockMutex(dev->pMutex);
char *real_path = fs_dev_real_path(path, dev);
if(!real_path) {
r->_errno = ENOMEM;
OSUnlockMutex(dev->pMutex);
return -1;
}
int result = IOSUHAX_FSA_ChangeMode(dev->fsaFd, real_path, mode);
free(real_path);
OSUnlockMutex(dev->pMutex);
if(result < 0) {
r->_errno = result;
return -1;
}
return 0;
}
static int fs_dev_statvfs_r (struct _reent *r, const char *path, struct statvfs *buf)
{
fs_dev_private_t *dev = fs_dev_get_device_data(path);
if(!dev) {
r->_errno = ENODEV;
return -1;
}
OSLockMutex(dev->pMutex);
// Zero out the stat buffer
memset(buf, 0, sizeof(struct statvfs));
char *real_path = fs_dev_real_path(path, dev);
if(!real_path) {
r->_errno = ENOMEM;
OSUnlockMutex(dev->pMutex);
return -1;
}
uint64_t size;
int result = IOSUHAX_FSA_GetDeviceInfo(dev->fsaFd, real_path, 0x00, (uint32_t*)&size);
free(real_path);
if(result < 0) {
r->_errno = result;
OSUnlockMutex(dev->pMutex);
return -1;
}
// File system block size
buf->f_bsize = 512;
// Fundamental file system block size
buf->f_frsize = 512;
// Total number of blocks on file system in units of f_frsize
buf->f_blocks = size >> 9; // this is unknown
// Free blocks available for all and for non-privileged processes
buf->f_bfree = buf->f_bavail = size >> 9;
// Number of inodes at this point in time
buf->f_files = 0xffffffff;
// Free inodes available for all and for non-privileged processes
buf->f_ffree = 0xffffffff;
// File system id
buf->f_fsid = (int)dev;
// Bit mask of f_flag values.
buf->f_flag = 0;
// Maximum length of filenames
buf->f_namemax = 255;
OSUnlockMutex(dev->pMutex);
return 0;
}
static DIR_ITER *fs_dev_diropen_r (struct _reent *r, DIR_ITER *dirState, const char *path)
{
fs_dev_private_t *dev = fs_dev_get_device_data(path);
if(!dev) {
r->_errno = ENODEV;
return NULL;
}
fs_dev_dir_entry_t *dirIter = (fs_dev_dir_entry_t *)dirState->dirStruct;
OSLockMutex(dev->pMutex);
char *real_path = fs_dev_real_path(path, dev);
if(!real_path) {
r->_errno = ENOMEM;
OSUnlockMutex(dev->pMutex);
return NULL;
}
int dirHandle;
int result = IOSUHAX_FSA_OpenDir(dev->fsaFd, real_path, &dirHandle);
free(real_path);
OSUnlockMutex(dev->pMutex);
if(result < 0)
{
r->_errno = result;
return NULL;
}
dirIter->dev = dev;
dirIter->dirHandle = dirHandle;
return dirState;
}
static int fs_dev_dirclose_r (struct _reent *r, DIR_ITER *dirState)
{
fs_dev_dir_entry_t *dirIter = (fs_dev_dir_entry_t *)dirState->dirStruct;
if(!dirIter->dev) {
r->_errno = ENODEV;
return -1;
}
OSLockMutex(dirIter->dev->pMutex);
int result = IOSUHAX_FSA_CloseDir(dirIter->dev->fsaFd, dirIter->dirHandle);
OSUnlockMutex(dirIter->dev->pMutex);
if(result < 0)
{
r->_errno = result;
return -1;
}
return 0;
}
static int fs_dev_dirreset_r (struct _reent *r, DIR_ITER *dirState)
{
fs_dev_dir_entry_t *dirIter = (fs_dev_dir_entry_t *)dirState->dirStruct;
if(!dirIter->dev) {
r->_errno = ENODEV;
return -1;
}
OSLockMutex(dirIter->dev->pMutex);
int result = IOSUHAX_FSA_RewindDir(dirIter->dev->fsaFd, dirIter->dirHandle);
OSUnlockMutex(dirIter->dev->pMutex);
if(result < 0)
{
r->_errno = result;
return -1;
}
return 0;
}
static int fs_dev_dirnext_r (struct _reent *r, DIR_ITER *dirState, char *filename, struct stat *st)
{
fs_dev_dir_entry_t *dirIter = (fs_dev_dir_entry_t *)dirState->dirStruct;
if(!dirIter->dev) {
r->_errno = ENODEV;
return -1;
}
OSLockMutex(dirIter->dev->pMutex);
directoryEntry_s * dir_entry = malloc(sizeof(directoryEntry_s));
int result = IOSUHAX_FSA_ReadDir(dirIter->dev->fsaFd, dirIter->dirHandle, dir_entry);
if(result < 0)
{
free(dir_entry);
r->_errno = result;
OSUnlockMutex(dirIter->dev->pMutex);
return -1;
}
// Fetch the current entry
strcpy(filename, dir_entry->name);
if(st)
{
memset(st, 0, sizeof(struct stat));
st->st_mode = (dir_entry->stat.flag & 0x80000000) ? S_IFDIR : S_IFREG;
st->st_nlink = 1;
st->st_size = dir_entry->stat.size;
st->st_blocks = (dir_entry->stat.size + 511) >> 9;
st->st_dev = dir_entry->stat.id;
st->st_uid = dir_entry->stat.owner_id;
st->st_gid = dir_entry->stat.group_id;
st->st_ino = dir_entry->stat.id;
st->st_atime = dir_entry->stat.mtime;
st->st_ctime = dir_entry->stat.ctime;
st->st_mtime = dir_entry->stat.mtime;
}
free(dir_entry);
OSUnlockMutex(dirIter->dev->pMutex);
return 0;
}
// NTFS device driver devoptab
static const devoptab_t devops_fs = {
NULL, /* Device name */
sizeof (fs_dev_file_state_t),
fs_dev_open_r,
fs_dev_close_r,
fs_dev_write_r,
fs_dev_read_r,
fs_dev_seek_r,
fs_dev_fstat_r,
fs_dev_stat_r,
fs_dev_link_r,
fs_dev_unlink_r,
fs_dev_chdir_r,
fs_dev_rename_r,
fs_dev_mkdir_r,
sizeof (fs_dev_dir_entry_t),
fs_dev_diropen_r,
fs_dev_dirreset_r,
fs_dev_dirnext_r,
fs_dev_dirclose_r,
fs_dev_statvfs_r,
fs_dev_ftruncate_r,
fs_dev_fsync_r,
fs_dev_chmod_r,
NULL, /* fs_dev_fchmod_r */
NULL /* Device data */
};
static int fs_dev_add_device (const char *name, const char *mount_path, int fsaFd, int isMounted)
{
devoptab_t *dev = NULL;
char *devname = NULL;
char *devpath = NULL;
int i;
// Sanity check
if (!name) {
errno = EINVAL;
return -1;
}
// Allocate a devoptab for this device
dev = (devoptab_t *) malloc(sizeof(devoptab_t) + strlen(name) + 1);
if (!dev) {
errno = ENOMEM;
return -1;
}
// Use the space allocated at the end of the devoptab for storing the device name
devname = (char*)(dev + 1);
strcpy(devname, name);
// create private data
fs_dev_private_t *priv = (fs_dev_private_t *)malloc(sizeof(fs_dev_private_t) + strlen(mount_path) + 1);
if(!priv) {
free(dev);
errno = ENOMEM;
return -1;
}
devpath = (char*)(priv+1);
strcpy(devpath, mount_path);
// setup private data
priv->mount_path = devpath;
priv->fsaFd = fsaFd;
priv->mounted = isMounted;
priv->pMutex = malloc(OS_MUTEX_SIZE);
if(!priv->pMutex) {
free(dev);
free(priv);
errno = ENOMEM;
return -1;
}
OSInitMutex(priv->pMutex);
// Setup the devoptab
memcpy(dev, &devops_fs, sizeof(devoptab_t));
dev->name = devname;
dev->deviceData = priv;
// Add the device to the devoptab table (if there is a free slot)
for (i = 3; i < STD_MAX; i++) {
if (devoptab_list[i] == devoptab_list[0]) {
devoptab_list[i] = dev;
return 0;
}
}
// failure, free all memory
free(priv);
free(dev);
// If we reach here then there are no free slots in the devoptab table for this device
errno = EADDRNOTAVAIL;
return -1;
}
static int fs_dev_remove_device (const char *path)
{
const devoptab_t *devoptab = NULL;
char name[128] = {0};
int i;
// Get the device name from the path
strncpy(name, path, 127);
strtok(name, ":/");
// Find and remove the specified device from the devoptab table
// NOTE: We do this manually due to a 'bug' in RemoveDevice
// which ignores names with suffixes and causes names
// like "ntfs" and "ntfs1" to be seen as equals
for (i = 3; i < STD_MAX; i++) {
devoptab = devoptab_list[i];
if (devoptab && devoptab->name) {
if (strcmp(name, devoptab->name) == 0) {
devoptab_list[i] = devoptab_list[0];
if(devoptab->deviceData)
{
fs_dev_private_t *priv = (fs_dev_private_t *)devoptab->deviceData;
if(priv->mounted)
IOSUHAX_FSA_Unmount(priv->fsaFd, priv->mount_path, 2);
if(priv->pMutex)
free(priv->pMutex);
free(devoptab->deviceData);
}
free((devoptab_t*)devoptab);
return 0;
}
}
}
return -1;
}
int mount_fs(const char *virt_name, int fsaFd, const char *dev_path, const char *mount_path)
{
int isMounted = 0;
if(dev_path)
{
isMounted = 1;
int res = IOSUHAX_FSA_Mount(fsaFd, dev_path, mount_path, 2, 0, 0);
if(res != 0)
{
return res;
}
}
return fs_dev_add_device(virt_name, mount_path, fsaFd, isMounted);
}
int unmount_fs(const char *virt_name)
{
return fs_dev_remove_device(virt_name);
}
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