b805e001db
The read-ready packet informs the server that the client wants to be notified if a handle becomes readable. When becoming readable, the server acknowledges packet and the client may queue a read requests accordingly.
1003 lines
27 KiB
C++
1003 lines
27 KiB
C++
/*
|
|
* \brief FFAT file system
|
|
* \author Christian Prochaska
|
|
* \date 2012-07-03
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2012-2017 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU General Public License version 2.
|
|
*/
|
|
|
|
/* Genode includes */
|
|
#include <file_system/node_handle_registry.h>
|
|
#include <file_system_session/rpc_object.h>
|
|
#include <root/component.h>
|
|
#include <cap_session/connection.h>
|
|
#include <base/attached_rom_dataspace.h>
|
|
#include <os/config.h>
|
|
#include <os/session_policy.h>
|
|
#include <util/xml_node.h>
|
|
#include <base/heap.h>
|
|
#include <base/log.h>
|
|
|
|
/* local includes */
|
|
#include <directory.h>
|
|
#include <file.h>
|
|
#include <util.h>
|
|
|
|
/* ffat includes */
|
|
namespace Ffat { extern "C" {
|
|
#include <ffat/ff.h>
|
|
} }
|
|
|
|
/*
|
|
* This macro is defined in later versions of the FatFs lib, but not in the
|
|
* one currently used for Genode.
|
|
*/
|
|
#define f_tell(fp) ((fp)->fptr)
|
|
|
|
|
|
using namespace Genode;
|
|
|
|
|
|
static Lock _ffat_lock;
|
|
typedef Lock_guard<Lock> Ffat_lock_guard;
|
|
|
|
|
|
/*************************
|
|
** File-system service **
|
|
*************************/
|
|
|
|
namespace File_system {
|
|
|
|
class Session_component : public Session_rpc_object
|
|
{
|
|
private:
|
|
|
|
Directory &_root;
|
|
Node_handle_registry _handle_registry;
|
|
bool _writable;
|
|
|
|
Signal_dispatcher<Session_component> _process_packet_dispatcher;
|
|
|
|
|
|
/******************************
|
|
** Packet-stream processing **
|
|
******************************/
|
|
|
|
/**
|
|
* Perform packet operation
|
|
*
|
|
* \return true on success, false on failure
|
|
*/
|
|
void _process_packet_op(Packet_descriptor &packet, Node &node)
|
|
{
|
|
void * const content = tx_sink()->packet_content(packet);
|
|
size_t const length = packet.length();
|
|
seek_off_t const offset = packet.position();
|
|
|
|
if (!content || (packet.length() > packet.size())) {
|
|
packet.succeeded(false);
|
|
return;
|
|
}
|
|
|
|
/* resulting length */
|
|
size_t res_length = 0;
|
|
|
|
Ffat_lock_guard ffat_lock_guard(_ffat_lock);
|
|
|
|
switch (packet.operation()) {
|
|
|
|
case Packet_descriptor::READ:
|
|
res_length = node.read((char *)content, length, offset);
|
|
break;
|
|
|
|
case Packet_descriptor::WRITE:
|
|
res_length = node.write((char const *)content, length, offset);
|
|
break;
|
|
|
|
case Packet_descriptor::READ_READY:
|
|
/* not supported */
|
|
break;
|
|
}
|
|
|
|
packet.length(res_length);
|
|
packet.succeeded(res_length > 0);
|
|
}
|
|
|
|
void _process_packet()
|
|
{
|
|
Packet_descriptor packet = tx_sink()->get_packet();
|
|
|
|
/* assume failure by default */
|
|
packet.succeeded(false);
|
|
|
|
try {
|
|
Node *node = _handle_registry.lookup(packet.handle());
|
|
_process_packet_op(packet, *node);
|
|
}
|
|
catch (Invalid_handle) { error("Invalid_handle"); }
|
|
|
|
/*
|
|
* The 'acknowledge_packet' function cannot block because we
|
|
* checked for 'ready_to_ack' in '_process_packets'.
|
|
*/
|
|
tx_sink()->acknowledge_packet(packet);
|
|
}
|
|
|
|
/**
|
|
* Called by signal dispatcher, executed in the context of the main
|
|
* thread (not serialized with the RPC functions)
|
|
*/
|
|
void _process_packets(unsigned)
|
|
{
|
|
while (tx_sink()->packet_avail()) {
|
|
|
|
/*
|
|
* Make sure that the '_process_packet' function does not
|
|
* block.
|
|
*
|
|
* If the acknowledgement queue is full, we defer packet
|
|
* processing until the client processed pending
|
|
* acknowledgements and thereby emitted a ready-to-ack
|
|
* signal. Otherwise, the call of 'acknowledge_packet()'
|
|
* in '_process_packet' would infinitely block the context
|
|
* of the main thread. The main thread is however needed
|
|
* for receiving any subsequent 'ready-to-ack' signals.
|
|
*/
|
|
if (!tx_sink()->ready_to_ack())
|
|
return;
|
|
|
|
_process_packet();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check if string represents a valid path (most start with '/')
|
|
*/
|
|
static void _assert_valid_path(char const *path)
|
|
{
|
|
if (!valid_path(path)) {
|
|
warning("malformed path '", path, "'");
|
|
throw Lookup_failed();
|
|
}
|
|
}
|
|
|
|
public:
|
|
|
|
/**
|
|
* Constructor
|
|
*/
|
|
Session_component(size_t tx_buf_size, Rpc_entrypoint &ep,
|
|
Region_map &rm,
|
|
Signal_receiver &sig_rec,
|
|
Directory &root, bool writable)
|
|
:
|
|
Session_rpc_object(env()->ram_session()->alloc(tx_buf_size), rm, ep),
|
|
_root(root),
|
|
_writable(writable),
|
|
_process_packet_dispatcher(sig_rec, *this,
|
|
&Session_component::_process_packets)
|
|
{
|
|
/*
|
|
* Register '_process_packets' dispatch function as signal
|
|
* handler for packet-avail and ready-to-ack signals.
|
|
*/
|
|
_tx.sigh_packet_avail(_process_packet_dispatcher);
|
|
_tx.sigh_ready_to_ack(_process_packet_dispatcher);
|
|
}
|
|
|
|
/**
|
|
* Destructor
|
|
*/
|
|
~Session_component()
|
|
{
|
|
Dataspace_capability ds = tx_sink()->dataspace();
|
|
env()->ram_session()->free(static_cap_cast<Ram_dataspace>(ds));
|
|
}
|
|
|
|
|
|
/***************************
|
|
** File_system interface **
|
|
***************************/
|
|
|
|
File_handle file(Dir_handle dir_handle, Name const &name,
|
|
Mode mode, bool create)
|
|
{
|
|
Ffat_lock_guard ffat_lock_guard(_ffat_lock);
|
|
|
|
if (!valid_filename(name.string()))
|
|
throw Invalid_name();
|
|
|
|
using namespace Ffat;
|
|
|
|
FIL ffat_fil;
|
|
BYTE ffat_flags = 0;
|
|
|
|
if (!_writable)
|
|
if (create || (mode != STAT_ONLY && mode != READ_ONLY))
|
|
throw Permission_denied();
|
|
|
|
if (create)
|
|
ffat_flags |= FA_CREATE_NEW;
|
|
|
|
if ((mode == READ_ONLY) || (mode == READ_WRITE))
|
|
ffat_flags |= FA_READ;
|
|
|
|
if ((mode == WRITE_ONLY) || (mode == READ_WRITE))
|
|
ffat_flags |= FA_WRITE;
|
|
|
|
Absolute_path absolute_path(_root.name());
|
|
|
|
try {
|
|
absolute_path.append(_handle_registry.lookup(dir_handle)->name());
|
|
absolute_path.append("/");
|
|
absolute_path.append(name.string());
|
|
} catch (Path_base::Path_too_long) {
|
|
throw Invalid_name();
|
|
}
|
|
|
|
FRESULT res = f_open(&ffat_fil, absolute_path.base(), ffat_flags);
|
|
|
|
switch(res) {
|
|
case FR_OK: {
|
|
File *file_node = new (env()->heap()) File(absolute_path.base());
|
|
file_node->ffat_fil(ffat_fil);
|
|
return _handle_registry.alloc(file_node);
|
|
}
|
|
case FR_NO_FILE:
|
|
case FR_NO_PATH:
|
|
throw Lookup_failed();
|
|
case FR_INVALID_NAME:
|
|
case FR_INVALID_DRIVE:
|
|
throw Invalid_name();
|
|
case FR_EXIST:
|
|
throw Node_already_exists();
|
|
case FR_DENIED:
|
|
case FR_WRITE_PROTECTED:
|
|
throw Permission_denied();
|
|
case FR_NOT_READY:
|
|
error("f_open() failed with error code FR_NOT_READY");
|
|
throw Lookup_failed();
|
|
case FR_DISK_ERR:
|
|
error("f_open() failed with error code FR_DISK_ERR");
|
|
throw Lookup_failed();
|
|
case FR_INT_ERR:
|
|
error("f_open() failed with error code FR_INT_ERR");
|
|
throw Lookup_failed();
|
|
case FR_NOT_ENABLED:
|
|
error("f_open() failed with error code FR_NOT_ENABLED");
|
|
throw Lookup_failed();
|
|
case FR_NO_FILESYSTEM:
|
|
error("f_open() failed with error code FR_NO_FILESYSTEM");
|
|
throw Lookup_failed();
|
|
default:
|
|
/* not supposed to occur according to the libffat documentation */
|
|
error("f_open() returned an unexpected error code");
|
|
throw Lookup_failed();
|
|
}
|
|
}
|
|
|
|
Symlink_handle symlink(Dir_handle, Name const &name, bool create)
|
|
{
|
|
/* not supported */
|
|
throw Permission_denied();
|
|
}
|
|
|
|
Dir_handle dir(Path const &path, bool create)
|
|
{
|
|
Ffat_lock_guard ffat_lock_guard(_ffat_lock);
|
|
|
|
if (create && !_writable)
|
|
throw Permission_denied();
|
|
|
|
_assert_valid_path(path.string());
|
|
|
|
/*
|
|
* The 'Directory' constructor removes trailing slashes,
|
|
* except for "/"
|
|
*/
|
|
Directory *dir_node = new (env()->heap()) Directory(path.string());
|
|
|
|
using namespace Ffat;
|
|
|
|
Absolute_path absolute_path(_root.name());
|
|
|
|
try {
|
|
absolute_path.append(dir_node->name());
|
|
absolute_path.remove_trailing('/');
|
|
} catch (Path_base::Path_too_long) {
|
|
throw Name_too_long();
|
|
}
|
|
|
|
if (create) {
|
|
|
|
if (is_root(dir_node->name()))
|
|
throw Node_already_exists();
|
|
|
|
FRESULT res = f_mkdir(absolute_path.base());
|
|
|
|
try {
|
|
switch(res) {
|
|
case FR_OK:
|
|
break;
|
|
case FR_NO_PATH:
|
|
throw Lookup_failed();
|
|
case FR_INVALID_NAME:
|
|
throw Name_too_long();
|
|
case FR_INVALID_DRIVE:
|
|
throw Name_too_long();
|
|
case FR_DENIED:
|
|
case FR_WRITE_PROTECTED:
|
|
throw Permission_denied();
|
|
case FR_EXIST:
|
|
throw Node_already_exists();
|
|
case FR_NOT_READY:
|
|
error("f_mkdir() failed with error code FR_NOT_READY");
|
|
throw Lookup_failed();
|
|
case FR_DISK_ERR:
|
|
error("f_mkdir() failed with error code FR_DISK_ERR");
|
|
throw Lookup_failed();
|
|
case FR_INT_ERR:
|
|
error("f_mkdir() failed with error code FR_INT_ERR");
|
|
throw Lookup_failed();
|
|
case FR_NOT_ENABLED:
|
|
error("f_mkdir() failed with error code FR_NOT_ENABLED");
|
|
throw Lookup_failed();
|
|
case FR_NO_FILESYSTEM:
|
|
error("f_mkdir() failed with error code FR_NO_FILESYSTEM");
|
|
throw Lookup_failed();
|
|
default:
|
|
/* not supposed to occur according to the libffat documentation */
|
|
error("f_mkdir() returned an unexpected error code");
|
|
throw Lookup_failed();
|
|
}
|
|
} catch (Exception e) {
|
|
destroy(env()->heap(), dir_node);
|
|
throw e;
|
|
}
|
|
}
|
|
|
|
Ffat::DIR ffat_dir;
|
|
FRESULT f_opendir_res = f_opendir(&ffat_dir, absolute_path.base());
|
|
|
|
try {
|
|
switch(f_opendir_res) {
|
|
case FR_OK:
|
|
dir_node->ffat_dir(ffat_dir);
|
|
return _handle_registry.alloc(dir_node);
|
|
case FR_NO_PATH:
|
|
throw Lookup_failed();
|
|
case FR_INVALID_NAME:
|
|
throw Name_too_long();
|
|
case FR_INVALID_DRIVE:
|
|
throw Name_too_long();
|
|
case FR_NOT_READY:
|
|
error("f_opendir() failed with error code FR_NOT_READY");
|
|
throw Lookup_failed();
|
|
case FR_DISK_ERR:
|
|
error("f_opendir() failed with error code FR_DISK_ERR");
|
|
throw Lookup_failed();
|
|
case FR_INT_ERR:
|
|
error("f_opendir() failed with error code FR_INT_ERR");
|
|
throw Lookup_failed();
|
|
case FR_NOT_ENABLED:
|
|
error("f_opendir() failed with error code FR_NOT_ENABLED");
|
|
throw Lookup_failed();
|
|
case FR_NO_FILESYSTEM:
|
|
error("f_opendir() failed with error code FR_NO_FILESYSTEM");
|
|
throw Lookup_failed();
|
|
default:
|
|
/* not supposed to occur according to the libffat documentation */
|
|
error("f_opendir() returned an unexpected error code");
|
|
throw Lookup_failed();
|
|
}
|
|
} catch (Exception e) {
|
|
destroy(env()->heap(), dir_node);
|
|
throw e;
|
|
}
|
|
}
|
|
|
|
Node_handle node(Path const &path)
|
|
{
|
|
Ffat_lock_guard ffat_lock_guard(_ffat_lock);
|
|
|
|
if (!valid_path(path.string()))
|
|
throw Lookup_failed();
|
|
|
|
Absolute_path absolute_path(_root.name());
|
|
|
|
try {
|
|
absolute_path.append(path.string());
|
|
absolute_path.remove_trailing('/');
|
|
} catch (Path_base::Path_too_long) {
|
|
throw Lookup_failed();
|
|
}
|
|
|
|
Node *node = new (env()->heap()) Node(absolute_path.base());
|
|
|
|
/* f_stat() does not work for "/" */
|
|
if (!is_root(node->name())) {
|
|
|
|
using namespace Ffat;
|
|
|
|
FILINFO file_info;
|
|
/* the long file name is not used in this function */
|
|
file_info.lfname = 0;
|
|
file_info.lfsize = 0;
|
|
|
|
FRESULT res = f_stat(node->name(), &file_info);
|
|
|
|
try {
|
|
switch(res) {
|
|
case FR_OK:
|
|
break;
|
|
case FR_NO_FILE:
|
|
case FR_NO_PATH:
|
|
throw Lookup_failed();
|
|
case FR_INVALID_NAME:
|
|
case FR_INVALID_DRIVE:
|
|
throw Lookup_failed();
|
|
case FR_DISK_ERR:
|
|
error("f_stat() failed with error code FR_DISK_ERR");
|
|
throw Lookup_failed();
|
|
case FR_INT_ERR:
|
|
error("f_stat() failed with error code FR_INT_ERR");
|
|
throw Lookup_failed();
|
|
case FR_NOT_READY:
|
|
error("f_stat() failed with error code FR_NOT_READY");
|
|
throw Lookup_failed();
|
|
case FR_NOT_ENABLED:
|
|
error("f_stat() failed with error code FR_NOT_ENABLED");
|
|
throw Lookup_failed();
|
|
case FR_NO_FILESYSTEM:
|
|
error("f_stat() failed with error code FR_NO_FILESYSTEM");
|
|
throw Lookup_failed();
|
|
default:
|
|
/* not supposed to occur according to the libffat documentation */
|
|
error("f_stat() returned an unexpected error code");
|
|
throw Lookup_failed();
|
|
}
|
|
} catch (Exception e) {
|
|
destroy(env()->heap(), node);
|
|
throw e;
|
|
}
|
|
}
|
|
|
|
return _handle_registry.alloc(node);
|
|
}
|
|
|
|
void close(Node_handle handle)
|
|
{
|
|
Ffat_lock_guard ffat_lock_guard(_ffat_lock);
|
|
|
|
Node *node;
|
|
|
|
try {
|
|
node = _handle_registry.lookup(handle);
|
|
} catch(Invalid_handle) {
|
|
error("close() called with invalid handle");
|
|
return;
|
|
}
|
|
|
|
/* free the handle */
|
|
_handle_registry.free(handle);
|
|
|
|
File *file = dynamic_cast<File *>(node);
|
|
if (file) {
|
|
using namespace Ffat;
|
|
|
|
FRESULT res = f_close(file->ffat_fil());
|
|
|
|
/* free the node */
|
|
destroy(env()->heap(), file);
|
|
|
|
switch(res) {
|
|
case FR_OK:
|
|
return;
|
|
case FR_INVALID_OBJECT:
|
|
error("f_close() failed with error code FR_INVALID_OBJECT");
|
|
return;
|
|
case FR_DISK_ERR:
|
|
error("f_close() failed with error code FR_DISK_ERR");
|
|
return;
|
|
case FR_INT_ERR:
|
|
error("f_close() failed with error code FR_INT_ERR");
|
|
return;
|
|
case FR_NOT_READY:
|
|
error("f_close() failed with error code FR_NOT_READY");
|
|
return;
|
|
default:
|
|
/* not supposed to occur according to the libffat documentation */
|
|
error("f_close() returned an unexpected error code");
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
Status status(Node_handle node_handle)
|
|
{
|
|
Ffat_lock_guard ffat_lock_guard(_ffat_lock);
|
|
|
|
Status status;
|
|
status.inode = 1;
|
|
status.size = 0;
|
|
status.mode = 0;
|
|
|
|
Node *node = _handle_registry.lookup(node_handle);
|
|
|
|
using namespace Ffat;
|
|
|
|
/* f_stat() does not work for the '/' directory */
|
|
if (!is_root(node->name())) {
|
|
|
|
FILINFO ffat_file_info;
|
|
/* the long file name is not used in this function */
|
|
ffat_file_info.lfname = 0;
|
|
ffat_file_info.lfsize = 0;
|
|
|
|
FRESULT res = f_stat(node->name(), &ffat_file_info);
|
|
|
|
switch(res) {
|
|
case FR_OK:
|
|
break;
|
|
case FR_NO_FILE:
|
|
error("f_stat() failed with error code FR_NO_FILE");
|
|
return status;
|
|
case FR_NO_PATH:
|
|
error("f_stat() failed with error code FR_NO_PATH");
|
|
return status;
|
|
case FR_INVALID_NAME:
|
|
error("f_stat() failed with error code FR_INVALID_NAME");
|
|
return status;
|
|
case FR_INVALID_DRIVE:
|
|
error("f_stat() failed with error code FR_INVALID_DRIVE");
|
|
return status;
|
|
case FR_DISK_ERR:
|
|
error("f_stat() failed with error code FR_DISK_ERR");
|
|
return status;
|
|
case FR_INT_ERR:
|
|
error("f_stat() failed with error code FR_INT_ERR");
|
|
return status;
|
|
case FR_NOT_READY:
|
|
error("f_stat() failed with error code FR_NOT_READY");
|
|
return status;
|
|
case FR_NOT_ENABLED:
|
|
error("f_stat() failed with error code FR_NOT_ENABLED");
|
|
return status;
|
|
case FR_NO_FILESYSTEM:
|
|
error("f_stat() failed with error code FR_NO_FILESYSTEM");
|
|
return status;
|
|
default:
|
|
/* not supposed to occur according to the libffat documentation */
|
|
error("f_stat() returned an unexpected error code");
|
|
return status;
|
|
}
|
|
|
|
if ((ffat_file_info.fattrib & AM_DIR) == AM_DIR) {
|
|
status.mode = File_system::Status::MODE_DIRECTORY; }
|
|
else {
|
|
status.mode = File_system::Status::MODE_FILE;
|
|
status.size = ffat_file_info.fsize;
|
|
}
|
|
|
|
} else {
|
|
status.mode = File_system::Status::MODE_DIRECTORY;
|
|
}
|
|
|
|
if (status.mode == File_system::Status::MODE_DIRECTORY) {
|
|
|
|
/* determine the number of directory entries */
|
|
|
|
Ffat::DIR ffat_dir;
|
|
FRESULT f_opendir_res = f_opendir(&ffat_dir, node->name());
|
|
|
|
if (f_opendir_res != FR_OK)
|
|
return status;
|
|
|
|
FILINFO ffat_file_info;
|
|
/* the long file name is not used in this function */
|
|
ffat_file_info.lfname = 0;
|
|
ffat_file_info.lfsize = 0;
|
|
|
|
int num_direntries = -1;
|
|
do {
|
|
++num_direntries;
|
|
FRESULT res = f_readdir(&ffat_dir, &ffat_file_info);
|
|
if (res != FR_OK)
|
|
return status;
|
|
} while (ffat_file_info.fname[0] != 0);
|
|
|
|
status.size = num_direntries * sizeof(Directory_entry);
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
void control(Node_handle, Control) { }
|
|
|
|
void unlink(Dir_handle dir_handle, Name const &name)
|
|
{
|
|
Ffat_lock_guard ffat_lock_guard(_ffat_lock);
|
|
|
|
if (!valid_filename(name.string()))
|
|
throw Invalid_name();
|
|
|
|
if (!_writable)
|
|
throw Permission_denied();
|
|
|
|
using namespace Ffat;
|
|
|
|
Absolute_path absolute_path(_root.name());
|
|
|
|
try {
|
|
absolute_path.append(_handle_registry.lookup(dir_handle)->name());
|
|
absolute_path.append("/");
|
|
absolute_path.append(name.string());
|
|
} catch (Path_base::Path_too_long) {
|
|
throw Invalid_name();
|
|
}
|
|
|
|
FRESULT res = f_unlink(absolute_path.base());
|
|
|
|
switch(res) {
|
|
case FR_OK:
|
|
break;
|
|
case FR_NO_FILE:
|
|
case FR_NO_PATH:
|
|
throw Lookup_failed();
|
|
case FR_INVALID_NAME:
|
|
case FR_INVALID_DRIVE:
|
|
throw Invalid_name();
|
|
case FR_DENIED:
|
|
case FR_WRITE_PROTECTED:
|
|
throw Permission_denied();
|
|
case FR_DISK_ERR:
|
|
error("f_unlink() failed with error code FR_DISK_ERR");
|
|
return;
|
|
case FR_INT_ERR:
|
|
error("f_unlink() failed with error code FR_INT_ERR");
|
|
return;
|
|
case FR_NOT_READY:
|
|
error("f_unlink() failed with error code FR_NOT_READY");
|
|
return;
|
|
case FR_NOT_ENABLED:
|
|
error("f_unlink() failed with error code FR_NOT_ENABLED");
|
|
return;
|
|
case FR_NO_FILESYSTEM:
|
|
error("f_unlink() failed with error code FR_NO_FILESYSTEM");
|
|
return;
|
|
default:
|
|
/* not supposed to occur according to the libffat documentation */
|
|
error("f_unlink() returned an unexpected error code");
|
|
return;
|
|
}
|
|
}
|
|
|
|
void truncate(File_handle file_handle, file_size_t size)
|
|
{
|
|
Ffat_lock_guard ffat_lock_guard(_ffat_lock);
|
|
|
|
if (!_writable)
|
|
throw Permission_denied();
|
|
|
|
File *file = _handle_registry.lookup(file_handle);
|
|
|
|
using namespace Ffat;
|
|
|
|
/* 'f_truncate()' truncates to the current seek pointer */
|
|
|
|
FRESULT res = f_lseek(file->ffat_fil(), size);
|
|
|
|
switch(res) {
|
|
case FR_OK:
|
|
/* according to the FatFs documentation this can happen */
|
|
if (f_tell(file->ffat_fil()) != size) {
|
|
error("f_lseek() could not seek to offset ", size);
|
|
return;
|
|
}
|
|
break;
|
|
case FR_DISK_ERR:
|
|
error("f_lseek() failed with error code FR_DISK_ERR");
|
|
return;
|
|
case FR_INT_ERR:
|
|
error("f_lseek() failed with error code FR_INT_ERR");
|
|
return;
|
|
case FR_NOT_READY:
|
|
error("f_lseek() failed with error code FR_NOT_READY");
|
|
return;
|
|
case FR_INVALID_OBJECT:
|
|
error("f_lseek() failed with error code FR_INVALID_OBJECT");
|
|
throw Invalid_handle();
|
|
default:
|
|
/* not supposed to occur according to the libffat documentation */
|
|
error("f_lseek() returned an unexpected error code");
|
|
return;
|
|
}
|
|
|
|
res = f_truncate(file->ffat_fil());
|
|
|
|
switch(res) {
|
|
case FR_OK:
|
|
return;
|
|
case FR_INVALID_OBJECT:
|
|
error("f_truncate() failed with error code FR_INVALID_OBJECT");
|
|
throw Invalid_handle();
|
|
case FR_DISK_ERR:
|
|
error("f_truncate() failed with error code FR_DISK_ERR");
|
|
return;
|
|
case FR_INT_ERR:
|
|
error("f_truncate() failed with error code FR_INT_ERR");
|
|
return;
|
|
case FR_NOT_READY:
|
|
error("f_truncate() failed with error code FR_NOT_READY");
|
|
return;
|
|
case FR_TIMEOUT:
|
|
error("f_truncate() failed with error code FR_TIMEOUT");
|
|
return;
|
|
default:
|
|
/* not supposed to occur according to the libffat documentation */
|
|
error("f_truncate() returned an unexpected error code");
|
|
return;
|
|
}
|
|
}
|
|
|
|
void move(Dir_handle from_dir_handle, Name const &from_name,
|
|
Dir_handle to_dir_handle, Name const &to_name)
|
|
{
|
|
Ffat_lock_guard ffat_lock_guard(_ffat_lock);
|
|
|
|
if (!_writable)
|
|
throw Permission_denied();
|
|
|
|
if (!valid_filename(from_name.string()))
|
|
throw Lookup_failed();
|
|
|
|
if (!valid_filename(to_name.string()))
|
|
throw Invalid_name();
|
|
|
|
Absolute_path absolute_from_path(_root.name());
|
|
Absolute_path absolute_to_path(_root.name());
|
|
|
|
try {
|
|
absolute_from_path.append(_handle_registry.lookup(from_dir_handle)->name());
|
|
absolute_from_path.append("/");
|
|
absolute_from_path.append(from_name.string());
|
|
absolute_to_path.append(_handle_registry.lookup(to_dir_handle)->name());
|
|
absolute_to_path.append("/");
|
|
absolute_to_path.append(to_name.string());
|
|
} catch (Path_base::Path_too_long) {
|
|
throw Invalid_name();
|
|
}
|
|
|
|
using namespace Ffat;
|
|
|
|
FRESULT res = f_rename(absolute_from_path.base(), absolute_to_path.base());
|
|
|
|
switch(res) {
|
|
case FR_OK:
|
|
break;
|
|
case FR_NO_FILE:
|
|
case FR_NO_PATH:
|
|
throw Lookup_failed();
|
|
case FR_INVALID_NAME:
|
|
case FR_INVALID_DRIVE:
|
|
throw Invalid_name();
|
|
case FR_EXIST:
|
|
error("f_rename() failed with error code FR_EXIST");
|
|
throw Invalid_name();
|
|
case FR_DENIED:
|
|
case FR_WRITE_PROTECTED:
|
|
throw Permission_denied();
|
|
case FR_DISK_ERR:
|
|
error("f_rename() failed with error code FR_DISK_ERR");
|
|
throw Lookup_failed();
|
|
case FR_INT_ERR:
|
|
error("f_rename() failed with error code FR_INT_ERR");
|
|
throw Lookup_failed();
|
|
case FR_NOT_READY:
|
|
error("f_rename() failed with error code FR_NOT_READY");
|
|
throw Lookup_failed();
|
|
case FR_NOT_ENABLED:
|
|
error("f_rename() failed with error code FR_NOT_ENABLED");
|
|
throw Lookup_failed();
|
|
case FR_NO_FILESYSTEM:
|
|
error("f_rename() failed with error code FR_NO_FILESYSTEM");
|
|
throw Lookup_failed();
|
|
default:
|
|
/* not supposed to occur according to the libffat documentation */
|
|
error("f_rename() returned an unexpected error code");
|
|
throw Lookup_failed();
|
|
}
|
|
}
|
|
|
|
void sigh(Node_handle, Genode::Signal_context_capability)
|
|
{
|
|
error("File_system::Session::sigh not supported");
|
|
}
|
|
};
|
|
|
|
|
|
class Root : public Root_component<Session_component>
|
|
{
|
|
private:
|
|
|
|
Rpc_entrypoint &_channel_ep;
|
|
Region_map &_rm;
|
|
Signal_receiver &_sig_rec;
|
|
Directory &_root_dir;
|
|
|
|
protected:
|
|
|
|
Session_component *_create_session(const char *args)
|
|
{
|
|
/*
|
|
* Determine client-specific policy defined implicitly by
|
|
* the client's label.
|
|
*/
|
|
Directory *session_root_dir = 0;
|
|
bool writeable = false;
|
|
|
|
enum { ROOT_MAX_LEN = 256 };
|
|
char root[ROOT_MAX_LEN];
|
|
root[0] = 0;
|
|
|
|
Session_label const label = label_from_args(args);
|
|
try {
|
|
Session_policy policy(label);
|
|
|
|
/*
|
|
* Determine directory that is used as root directory of
|
|
* the session.
|
|
*/
|
|
try {
|
|
policy.attribute("root").value(root, sizeof(root));
|
|
if (is_root(root)) {
|
|
session_root_dir = &_root_dir;
|
|
} else {
|
|
/*
|
|
* Make sure the root path is specified with a
|
|
* leading path delimiter. For performing the
|
|
* lookup, we skip the first character.
|
|
*/
|
|
if (root[0] != '/')
|
|
throw Lookup_failed();
|
|
|
|
/* Check if the root path exists */
|
|
|
|
using namespace Ffat;
|
|
|
|
FRESULT res = f_chdir(root);
|
|
|
|
switch(res) {
|
|
case FR_OK:
|
|
break;
|
|
case FR_NO_PATH:
|
|
throw Lookup_failed();
|
|
case FR_INVALID_NAME:
|
|
case FR_INVALID_DRIVE:
|
|
throw Lookup_failed();
|
|
case FR_NOT_READY:
|
|
error("f_chdir() failed with error code FR_NOT_READY");
|
|
throw Root::Unavailable();
|
|
case FR_DISK_ERR:
|
|
error("f_chdir() failed with error code FR_DISK_ERR");
|
|
throw Root::Unavailable();
|
|
case FR_INT_ERR:
|
|
error("f_chdir() failed with error code FR_INT_ERR");
|
|
throw Root::Unavailable();
|
|
case FR_NOT_ENABLED:
|
|
error("f_chdir() failed with error code FR_NOT_ENABLED");
|
|
throw Root::Unavailable();
|
|
case FR_NO_FILESYSTEM:
|
|
error("f_chdir() failed with error code FR_NO_FILESYSTEM");
|
|
throw Root::Unavailable();
|
|
default:
|
|
/* not supposed to occur according to the libffat documentation */
|
|
error("f_chdir() returned an unexpected error code");
|
|
throw Root::Unavailable();
|
|
}
|
|
|
|
session_root_dir = new (env()->heap()) Directory(root);
|
|
}
|
|
} catch (Xml_node::Nonexistent_attribute) {
|
|
error("missing \"root\" attribute in policy definition");
|
|
throw Root::Unavailable();
|
|
} catch (Lookup_failed) {
|
|
error("session root directory \"", Cstring(root), "\" does not exist");
|
|
throw Root::Unavailable();
|
|
}
|
|
|
|
/*
|
|
* Determine if write access is permitted for the session.
|
|
*/
|
|
writeable = policy.attribute_value("writeable", false);
|
|
|
|
} catch (Session_policy::No_policy_defined) {
|
|
error("Invalid session request, no matching policy");
|
|
throw Root::Unavailable();
|
|
}
|
|
|
|
size_t ram_quota =
|
|
Arg_string::find_arg(args, "ram_quota" ).ulong_value(0);
|
|
size_t tx_buf_size =
|
|
Arg_string::find_arg(args, "tx_buf_size").ulong_value(0);
|
|
|
|
if (!tx_buf_size) {
|
|
error(label, " requested a session with a zero length transmission buffer");
|
|
throw Root::Invalid_args();
|
|
}
|
|
|
|
/*
|
|
* Check if donated ram quota suffices for session data,
|
|
* and communication buffer.
|
|
*/
|
|
size_t session_size = sizeof(Session_component) + tx_buf_size;
|
|
if (max((size_t)4096, session_size) > ram_quota) {
|
|
error("insufficient 'ram_quota', got ", ram_quota, ", "
|
|
"need ", session_size);
|
|
throw Root::Quota_exceeded();
|
|
}
|
|
return new (md_alloc())
|
|
Session_component(tx_buf_size, _channel_ep, _rm, _sig_rec,
|
|
*session_root_dir, writeable);
|
|
}
|
|
|
|
public:
|
|
|
|
/**
|
|
* Constructor
|
|
*
|
|
* \param session_ep session entrypoint
|
|
* \param sig_rec signal receiver used for handling the
|
|
* data-flow signals of packet streams
|
|
* \param md_alloc meta-data allocator
|
|
*/
|
|
Root(Rpc_entrypoint &session_ep, Allocator &md_alloc,
|
|
Region_map &rm,
|
|
Signal_receiver &sig_rec, Directory &root_dir)
|
|
:
|
|
Root_component<Session_component>(&session_ep, &md_alloc),
|
|
_channel_ep(session_ep), _rm(rm), _sig_rec(sig_rec),
|
|
_root_dir(root_dir)
|
|
{ }
|
|
};
|
|
};
|
|
|
|
|
|
int main(int, char **)
|
|
{
|
|
using namespace File_system;
|
|
using namespace Ffat;
|
|
|
|
static Ffat::FATFS _fatfs;
|
|
|
|
/* mount the file system */
|
|
if (f_mount(0, &_fatfs) != Ffat::FR_OK) {
|
|
error("mount failed");
|
|
return -1;
|
|
}
|
|
|
|
enum { STACK_SIZE = 3*sizeof(addr_t)*1024 };
|
|
static Cap_connection cap;
|
|
static Rpc_entrypoint ep(&cap, STACK_SIZE, "ffat_fs_ep");
|
|
static Sliced_heap sliced_heap(env()->ram_session(), env()->rm_session());
|
|
static Signal_receiver sig_rec;
|
|
|
|
static Directory root_dir("/");
|
|
|
|
static File_system::Root root(ep, sliced_heap, *env()->rm_session(), sig_rec, root_dir);
|
|
|
|
env()->parent()->announce(ep.manage(&root));
|
|
|
|
for (;;) {
|
|
Signal s = sig_rec.wait_for_signal();
|
|
static_cast<Signal_dispatcher_base *>(s.context())->dispatch(s.num());
|
|
}
|
|
|
|
return 0;
|
|
}
|