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server/fs_log: improve client isolation

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Use a seperate handle at each session.
Use SEEK_TAIL to append messages to files.
Increase packet buffer.
Refactor to component framework.

Fixes #1777
Issue #2060
This commit is contained in:
Emery Hemingway 2016-08-23 17:05:37 +02:00 committed by Christian Helmuth
parent 6018f594cf
commit 482576fabb
8 changed files with 184 additions and 307 deletions
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14
repos/os/include/os/path.h
View File

@ -341,8 +341,8 @@ class Genode::Path_base
template <unsigned MAX_LEN>
class Genode::Path : public Path_base {
class Genode::Path : public Path_base
{
private:
char _buf[MAX_LEN];
@ -371,8 +371,16 @@ class Genode::Path : public Path_base {
return *this;
}
Path(Path const &other) : Path_base(_buf, sizeof(_buf), other._buf) { }
Path& operator=(Path const &other)
{
Genode::strncpy(_buf, other._buf, MAX_LEN);
return *this;
}
template <unsigned N>
Path& operator=(Path<N> &other)
Path& operator=(Path<N> const &other)
{
Genode::strncpy(_buf, other._buf, MAX_LEN);
return *this;

4
repos/os/run/fs_log.run
View File

@ -20,6 +20,8 @@ set config {
<service name="RAM"/>
<service name="RM"/>
<service name="ROM"/>
<service name="IO_PORT"/>
<service name="IRQ"/>
</parent-provides>
<default-route>
<any-service> <parent/> <any-child/> </any-service>
@ -67,4 +69,4 @@ build_boot_image "core init ld.lib.so bomb timer vfs fs_log"
append qemu_args " -nographic"
run_genode_until "Done\. Going to sleep\." $timeout
run_genode_until {.*\[0] Done\..*\n} $timeout

5
repos/os/src/server/fs_log/README
View File

@ -9,6 +9,9 @@ through session policy, as well the option to merge the logs of any
session matching a given policy. When a merged policy label contains a
trailing "->", the log filename takes the name of the next label element.
When a default-policy node specifies a merge, all sessions are merged into
the file "/log".
:Example configuration:
! <start name="log_file">
! <resource name="RAM" quantum="1M"/>
@ -16,7 +19,7 @@ trailing "->", the log filename takes the name of the next label element.
! <config>
! <policy label="nic_drv" truncate="no"/>
! <policy label_prefix="cli_monitor -> " merge="yes"/>
! <policy truncate="yes"/>
! <default-policy truncate="yes"/>
! </config>
! </start>

97
repos/os/src/server/fs_log/log_file.h
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@ -1,97 +0,0 @@
/*
* \brief File object shared between log sessions
* \author Emery Hemingway
* \date 2015-06-09
*/
/*
* Copyright (C) 2015 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.
*/
#ifndef _FS_LOG__LOG_FILE_H_
#define _FS_LOG__LOG_FILE_H_
/* Genode includes */
#include <log_session/log_session.h>
#include <file_system_session/file_system_session.h>
namespace Fs_log {
using namespace Genode;
using namespace File_system;
class Log_file;
}
class Fs_log::Log_file : public List<Log_file>::Element
{
private:
char _dir_path[ MAX_PATH_LEN];
char _file_name[MAX_NAME_LEN];
File_system::Session &_fs;
File_handle _handle;
seek_off_t _offset;
int _clients;
public:
/**
* Constructor
*/
Log_file(File_system::Session &fs, File_handle handle,
char const *dir_path, char const *file_name,
seek_off_t offset)
:
_fs(fs), _handle(handle), _offset(offset), _clients(0)
{
strncpy(_dir_path, dir_path, sizeof(_dir_path));
strncpy(_file_name, file_name, sizeof(_file_name));
}
~Log_file() { _fs.close(_handle); }
bool match(char const *dir, char const *filename) const
{
return
(strcmp(_dir_path, dir, MAX_PATH_LEN) == 0) &&
(strcmp(_file_name, filename, MAX_NAME_LEN) == 0);
}
void incr() { ++_clients; }
void decr() { --_clients; }
int client_count() const { return _clients; }
/**
* Write a log message to the packet buffer.
*/
size_t write(char const *msg, size_t msg_len)
{
File_system::Session::Tx::Source &source = *_fs.tx();
File_system::Packet_descriptor raw_packet;
if (!source.ready_to_submit())
raw_packet = source.get_acked_packet();
else
raw_packet = source.alloc_packet(Log_session::String::MAX_SIZE);
File_system::Packet_descriptor
packet(raw_packet,
_handle, File_system::Packet_descriptor::WRITE,
msg_len, _offset);
_offset += msg_len;
char *buf = source.packet_content(packet);
memcpy(buf, msg, msg_len);
source.submit_packet(packet);
return msg_len;
}
};
#endif

230
repos/os/src/server/fs_log/main.cc
View File

@ -13,16 +13,17 @@
/* Genode includes */
#include <base/heap.h>
#include <os/path.h>
#include <file_system_session/connection.h>
#include <file_system/util.h>
#include <root/component.h>
#include <os/server.h>
#include <os/path.h>
#include <os/session_policy.h>
#include <base/heap.h>
#include <base/attached_rom_dataspace.h>
#include <root/component.h>
#include <base/component.h>
#include <base/log.h>
/* Local includes */
#include "log_file.h"
#include "session.h"
namespace Fs_log {
@ -31,35 +32,34 @@ namespace Fs_log {
using namespace File_system;
class Root_component;
struct Main;
enum {
BLOCK_SIZE = Log_session::String::MAX_SIZE,
PACKET_SIZE = Log_session::String::MAX_SIZE,
QUEUE_SIZE = File_system::Session::TX_QUEUE_SIZE,
TX_BUF_SIZE = BLOCK_SIZE * (QUEUE_SIZE*2 + 1)
TX_BUF_SIZE = PACKET_SIZE * (QUEUE_SIZE+2)
};
typedef Genode::Path<File_system::MAX_PATH_LEN> Path;
}
class Fs_log::Root_component :
public Genode::Root_component<Fs_log::Session_component>
{
private:
Allocator_avl _write_alloc;
File_system::Connection _fs;
List<Log_file> _log_files;
Genode::Env &_env;
Genode::Attached_rom_dataspace _config_rom { _env, "config" };
Genode::Heap _heap { _env.ram(), _env.rm() };
Allocator_avl _tx_alloc { &_heap };
File_system::Connection _fs
{ _env, _tx_alloc, "", "/", true, TX_BUF_SIZE };
Log_file *lookup(char const *dir, char const *filename)
{
for (Log_file *file = _log_files.first(); file; file = file->next())
if (file->match(dir, filename))
return file;
void _update_config() { _config_rom.update(); }
return 0;
}
Genode::Signal_handler<Root_component> _config_handler
{ _env.ep(), *this, &Root_component::_update_config };
protected:
@ -67,30 +67,29 @@ class Fs_log::Root_component :
{
using namespace File_system;
char dir_path[MAX_PATH_LEN];
size_t ram_quota =
Arg_string::find_arg(args, "ram_quota").aligned_size();
if (ram_quota < sizeof(Session_component))
throw Root::Quota_exceeded();
Path dir_path;
char file_name[MAX_NAME_LEN];
dir_path[0] = '/';
bool truncate = false;
Session_label const session_label = label_from_args(args);
char const *label_str = session_label.string();
char const *label_prefix = "";
strncpy(dir_path+1, label_str, MAX_PATH_LEN-1);
bool truncate = false;
try {
Session_policy policy(session_label);
Session_policy policy(session_label, _config_rom.xml());
truncate = policy.attribute_value("truncate", truncate);
bool merge = policy.attribute_value("merge", false);
if (policy.attribute_value("merge", false)
&& policy.has_attribute("label_prefix")) {
if (!dir_path[1]) {
Genode::error("cannot merge an empty policy label");
throw Root::Unavailable();
}
/* only a match on 'label_prefix' can be merged */
if (merge && policy.has_type("policy")
&& (!(policy.has_attribute("label")
|| policy.has_attribute("label_suffix"))))
{
/*
* split the label between what will be the log file
* and what will be prepended to messages in the file
@ -100,103 +99,75 @@ class Fs_log::Root_component :
if (strcmp(label_str+i, " -> ", 4))
continue;
dir_path[i+1] = '\0';
label_prefix = label_str+i+4;
{
char tmp[128];
strncpy(tmp, label_str, min(sizeof(tmp), i+1));
dir_path = path_from_label<Path>(tmp);
}
break;
}
}
} catch (Session_policy::No_policy_defined) { }
if (dir_path == "/")
dir_path = path_from_label<Path>(label_str);
{
/* Parse out a directory and file name. */
size_t len = strlen(dir_path);
size_t start = 1;
for (size_t i = 1; i < len;) {
/* Replace any slashes in label elements. */
if (dir_path[i] == '/') dir_path[i] = '_';
if (strcmp(" -> ", dir_path+i, 4) == 0) {
dir_path[i++] = '/';
strncpy(dir_path+i, dir_path+i+3, MAX_PATH_LEN-i);
start = i;
i += 3;
} else ++i;
} else if (!policy.has_type("default-policy")) {
dir_path = path_from_label<Path>(label_str);
}
/* Copy the remainder to the file name. */
snprintf(file_name, MAX_NAME_LEN, "%s.log", dir_path+start);
/* Terminate the directory path. */
dir_path[(start == 1) ? start : start-1] = '\0';
/* Rewrite any slashes in the name. */
for (char *p = file_name; *p; ++p)
if (*p == '/') *p = '_';
} catch (Session_policy::No_policy_defined) {
dir_path = path_from_label<Path>(label_str);
}
Log_file *file = lookup(dir_path, file_name);
if (!file) try {
if (dir_path == "/") {
strncpy(file_name, "log", sizeof(file_name));
label_prefix = label_str;
} else {
dir_path.append(".log");
strncpy(file_name, dir_path.last_element(), sizeof(file_name));
dir_path.strip_last_element();
dir_path.remove_trailing('/');
}
Dir_handle dir_handle = ensure_dir(_fs, dir_path);
char const *errstr;
try {
Dir_handle dir_handle = ensure_dir(_fs, dir_path.base());
Handle_guard dir_guard(_fs, dir_handle);
File_handle handle;
seek_off_t offset = 0;
try {
handle = _fs.file(dir_handle, file_name,
File_system::WRITE_ONLY, false);
if (truncate)
/* don't truncate at every new child session */
if (truncate && (strcmp(label_prefix, "") == 0))
_fs.truncate(handle, 0);
else
offset = _fs.status(handle).size;
} catch (File_system::Lookup_failed) {
handle = _fs.file(dir_handle, file_name,
File_system::WRITE_ONLY, true);
}
file = new (env()->heap())
Log_file(_fs, handle, dir_path, file_name, offset);
_log_files.insert(file);
} catch (Permission_denied) {
error(Path(file_name, dir_path), ": permission denied");
} catch (No_space) {
error("file system out of space");
} catch (Out_of_metadata) {
error("file system server out of metadata");
} catch (Invalid_name) {
error(Path(file_name, dir_path), ": invalid path");
} catch (Name_too_long) {
error(Path(file_name, dir_path), ": name too long");
} catch (...) {
error("cannot open log file ", Path(file_name, dir_path));
throw;
return new (md_alloc()) Session_component(_fs, handle, label_prefix);
}
if (!file)
catch (Permission_denied) {
errstr = "permission denied"; }
catch (No_space) {
errstr = "file system out of space"; }
catch (Out_of_metadata) {
errstr = "file system server out of metadata"; }
catch (Invalid_name) {
errstr = "invalid path"; }
catch (Name_too_long) {
errstr = "name too long"; }
catch (...) {
errstr = "unhandled error"; }
Genode::error("cannot open log file ",
(char const *)dir_path.base(),
", ", errstr);
throw Root::Unavailable();
if (*label_prefix)
return new (md_alloc()) Labeled_session_component(label_prefix, *file);
return new (md_alloc()) Unlabeled_session_component(*file);
}
void _destroy_session(Session_component *session)
{
Log_file *file = session->file();
destroy(md_alloc(), session);
if (file->client_count() < 1) {
_log_files.remove(file);
destroy(env()->heap(), file);
}
}
public:
@ -204,39 +175,32 @@ class Fs_log::Root_component :
/**
* Constructor
*/
Root_component(Server::Entrypoint &ep, Allocator &alloc)
Root_component(Genode::Env &env, Genode::Allocator &md_alloc)
:
Genode::Root_component<Session_component>(&ep.rpc_ep(), &alloc),
_write_alloc(env()->heap()),
_fs(_write_alloc, TX_BUF_SIZE)
{ }
Genode::Root_component<Session_component>(&env.ep().rpc_ep(), &md_alloc),
_env(env)
{
_config_rom.sigh(_config_handler);
/* fill the ack queue with packets so sessions never need to alloc */
File_system::Session::Tx::Source &source = *_fs.tx();
for (int i = 0; i < QUEUE_SIZE-1; ++i)
source.submit_packet(source.alloc_packet(PACKET_SIZE));
env.parent().announce(env.ep().manage(*this));
}
};
struct Fs_log::Main
/***************
** Component **
***************/
Genode::size_t Component::stack_size() { return 4*1024*sizeof(long); }
void Component::construct(Genode::Env &env)
{
Server::Entrypoint &ep;
Sliced_heap sliced_heap = { env()->ram_session(), env()->rm_session() };
Root_component root { ep, sliced_heap };
Main(Server::Entrypoint &ep)
: ep(ep)
{ Genode::env()->parent()->announce(ep.manage(root)); }
};
/************
** Server **
************/
namespace Server {
char const* name() { return "fs_log_ep"; }
size_t stack_size() { return 3*512*sizeof(long); }
void construct(Entrypoint &ep) { static Fs_log::Main inst(ep); }
static Genode::Sliced_heap sliced_heap { env.ram(), env.rm() };
static Fs_log::Root_component root { env, sliced_heap };
}

136
repos/os/src/server/fs_log/session.h
View File

@ -8,7 +8,7 @@
*/
/*
* Copyright (C) 2015 Genode Labs GmbH
* Copyright (C) 2016 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.
@ -21,98 +21,94 @@
#include <log_session/log_session.h>
#include <file_system_session/file_system_session.h>
#include <base/rpc_server.h>
/* Local includes */
#include "log_file.h"
#include <base/snprintf.h>
#include <base/log.h>
namespace Fs_log {
enum { MAX_LABEL_LEN = 128 };
class Session_component;
class Unlabeled_session_component;
class Labeled_session_component;
}
class Fs_log::Session_component : public Rpc_object<Log_session, Unlabeled_session_component>
{
protected:
Log_file &_log_file;
public:
Session_component(Log_file &log_file)
: _log_file(log_file) { _log_file.incr(); }
~Session_component() { _log_file.decr(); }
Log_file *file() const { return &_log_file; }
virtual size_t write(String const &string) = 0;
};
class Fs_log::Unlabeled_session_component : public Session_component
{
public:
/**
* Constructor
*/
Unlabeled_session_component(Log_file &log_file)
: Session_component(log_file) { }
/*****************
** Log session **
*****************/
size_t write(Log_session::String const &msg)
{
if (!msg.valid_string()) {
Genode::error("corrupted string");
return 0;
}
char const *msg_str = msg.string();
size_t msg_len = Genode::strlen(msg_str);
return _log_file.write(msg_str, msg_len);
}
};
class Fs_log::Labeled_session_component : public Session_component
class Fs_log::Session_component : public Genode::Rpc_object<Genode::Log_session>
{
private:
char _label[Log_session::String::MAX_SIZE];
size_t _label_len;
char _label_buf[MAX_LABEL_LEN];
Genode::size_t const _label_len;
File_system::Session &_fs;
File_system::File_handle const _handle;
public:
/**
* Constructor
*/
Labeled_session_component(char const *label, Log_file &log_file)
: Session_component(log_file)
Session_component(File_system::Session &fs,
File_system::File_handle handle,
char const *label)
:
_label_len(Genode::strlen(label) ? Genode::strlen(label)+3 : 0),
_fs(fs), _handle(handle)
{
snprintf(_label, sizeof(_label), "[%s] ", label);
_label_len = strlen(_label);
if (_label_len)
Genode::snprintf(_label_buf, MAX_LABEL_LEN, "[%s] ", label);
}
~Session_component()
{
_fs.sync(_handle);
_fs.close(_handle);
}
/*****************
** Log session **
*****************/
size_t write(Log_session::String const &msg)
Genode::size_t write(Log_session::String const &msg)
{
if (!msg.valid_string()) {
Genode::error("corrupted string");
using namespace Genode;
if (!msg.is_valid_string()) {
Genode::error("received corrupted string");
return 0;
}
char const *msg_str = msg.string();
size_t msg_len = Genode::strlen(msg_str);
size_t msg_len = strlen(msg.string());
_log_file.write(_label, _label_len);
return _log_file.write(msg_str, msg_len);
File_system::Session::Tx::Source &source = *_fs.tx();
File_system::Packet_descriptor packet(
source.get_acked_packet(),
_handle, File_system::Packet_descriptor::WRITE,
msg_len, File_system::SEEK_TAIL);
char *buf = source.packet_content(packet);
if (_label_len) {
memcpy(buf, _label_buf, _label_len);
if (_label_len+msg_len > Log_session::String::MAX_SIZE) {
packet.length(msg_len);
source.submit_packet(packet);
packet = File_system::Packet_descriptor(
source.get_acked_packet(),
_handle, File_system::Packet_descriptor::WRITE,
msg_len, File_system::SEEK_TAIL);
buf = source.packet_content(packet);
} else {
buf += _label_len;
packet.length(_label_len+msg_len);
}
}
memcpy(buf, msg.string(), msg_len);
source.submit_packet(packet);
return msg_len;
}
};

2
repos/os/src/server/fs_log/target.mk
View File

@ -1,3 +1,3 @@
TARGET = fs_log
SRC_CC = main.cc
LIBS = base config server
LIBS = base

1
tool/autopilot.list
View File

@ -67,3 +67,4 @@ rust
xml_node
fpu
ds_ownership
fs_log