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Improve VFS server session quota management

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Move the allocation of the session packet buffer into a subclass that is
constructed before the File_system RPC object. This allows the buffer
allocation to be wrapped in a constructor/destructor class and clearly
accounted for.

Fix #3134
This commit is contained in:
Emery Hemingway 2019-01-25 15:51:31 +01:00 committed by Norman Feske
parent 37b2aaa051
commit 4f88b664e2
1 changed files with 33 additions and 11 deletions
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44
repos/os/src/server/vfs/main.cc
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@ -16,6 +16,7 @@
#include <base/component.h>
#include <base/registry.h>
#include <base/heap.h>
#include <base/attached_ram_dataspace.h>
#include <base/attached_rom_dataspace.h>
#include <file_system_session/rpc_object.h>
#include <root/component.h>
@ -33,6 +34,7 @@ namespace Vfs_server {
using namespace File_system;
using namespace Vfs;
class Session_resources;
class Session_component;
class Io_response_handler;
class Watch_response_handler;
@ -54,18 +56,41 @@ namespace Vfs_server {
};
class Vfs_server::Session_component : public ::File_system::Session_rpc_object,
/**
* Base class to manage session quotas and allocations
*/
class Vfs_server::Session_resources
{
protected:
Genode::Ram_quota_guard _ram_guard;
Genode::Cap_quota_guard _cap_guard;
Genode::Constrained_ram_allocator _ram_alloc;
Genode::Attached_ram_dataspace _packet_ds;
Genode::Heap _alloc;
Session_resources(Genode::Ram_allocator &ram,
Genode::Region_map &region_map,
Genode::Ram_quota ram_quota,
Genode::Cap_quota cap_quota,
Genode::size_t buffer_size)
:
_ram_guard(ram_quota), _cap_guard(cap_quota),
_ram_alloc(ram, _ram_guard, _cap_guard),
_packet_ds(_ram_alloc, region_map, buffer_size),
_alloc(_ram_alloc, region_map)
{ }
};
class Vfs_server::Session_component : private Session_resources,
public ::File_system::Session_rpc_object,
public Session_io_handler
{
private:
Node_space _node_space { };
Genode::Ram_quota_guard _ram_guard;
Genode::Cap_quota_guard _cap_guard;
Genode::Constrained_ram_allocator _ram_alloc;
Genode::Heap _alloc;
Genode::Signal_handler<Session_component> _process_packet_handler;
Vfs::File_system &_vfs;
@ -400,11 +425,8 @@ class Vfs_server::Session_component : public ::File_system::Session_rpc_object,
char const *root_path,
bool writable)
:
Session_rpc_object(env.ram().alloc(tx_buf_size), env.rm(), env.ep().rpc_ep()),
_ram_guard(ram_quota),
_cap_guard(cap_quota),
_ram_alloc(env.pd(), _ram_guard, _cap_guard),
_alloc(_ram_alloc, env.rm()),
Session_resources(env.pd(), env.rm(), ram_quota, cap_quota, tx_buf_size),
Session_rpc_object(_packet_ds.cap(), env.rm(), env.ep().rpc_ep()),
_process_packet_handler(env.ep(), *this, &Session_component::_process_packets),
_vfs(vfs),
_root_path(root_path),