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File_system::Connection: session upgrading

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Upgrade the File_system session RAM quota when an Out_of_metadata
exception is caught.

Issue #1751
Issue #1909
This commit is contained in:
Emery Hemingway 2016-03-17 16:29:27 +01:00 committed by Christian Helmuth
parent cb952d2087
commit e22cd98a4f
1 changed files with 68 additions and 7 deletions
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75
repos/os/include/file_system_session/connection.h
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@ -5,7 +5,7 @@
*/
/*
* Copyright (C) 2012-2013 Genode Labs GmbH
* Copyright (C) 2012-2016 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.
@ -17,9 +17,11 @@
#include <file_system_session/client.h>
#include <base/connection.h>
#include <base/allocator.h>
#include <util/retry.h>
namespace File_system {
struct Connection_base;
struct Connection;
/* recommended packet transmission buffer size */
@ -28,7 +30,10 @@ namespace File_system {
}
struct File_system::Connection : Genode::Connection<Session>, Session_client
/**
* The base implementation of a File_system connection
*/
struct File_system::Connection_base : Genode::Connection<Session>, Session_client
{
/**
* Constructor
@ -36,12 +41,15 @@ struct File_system::Connection : Genode::Connection<Session>, Session_client
* \param tx_buffer_alloc allocator used for managing the
* transmission buffer
* \param tx_buf_size size of transmission buffer in bytes
* \param label session label
* \param root root directory of session
* \param writeable session is writable
*/
Connection(Genode::Range_allocator &tx_block_alloc,
size_t tx_buf_size = DEFAULT_TX_BUF_SIZE,
char const *label = "",
char const *root = "/",
bool writeable = true)
Connection_base(Genode::Range_allocator &tx_block_alloc,
size_t tx_buf_size = DEFAULT_TX_BUF_SIZE,
char const *label = "",
char const *root = "/",
bool writeable = true)
:
Genode::Connection<Session>(
session("ram_quota=%zd, "
@ -56,4 +64,57 @@ struct File_system::Connection : Genode::Connection<Session>, Session_client
{ }
};
/**
* A File_system connection that upgrades its RAM quota
*/
struct File_system::Connection : File_system::Connection_base
{
/* reuse constructor */
using Connection_base::Connection_base;
/**
* Upgrade the session quota in response to Out_of_metadata
*/
void upgrade_ram()
{
PWRN("upgrading File_system session");
Genode::env()->parent()->upgrade(cap(), "ram=8K");
}
enum { UPGRADE_ATTEMPTS = 2 };
Dir_handle dir(Path const &path, bool create) override
{
return Genode::retry<Out_of_metadata>(
[&] () { return Session_client::dir(path, create); },
[&] () { upgrade_ram(); },
UPGRADE_ATTEMPTS);
}
File_handle file(Dir_handle dir, Name const &name, Mode mode, bool create) override
{
return Genode::retry<Out_of_metadata>(
[&] () { return Session_client::file(dir, name, mode, create); },
[&] () { upgrade_ram(); },
UPGRADE_ATTEMPTS);
}
Symlink_handle symlink(Dir_handle dir, Name const &name, bool create) override
{
return Genode::retry<Out_of_metadata>(
[&] () { return Session_client::symlink(dir, name, create); },
[&] () { upgrade_ram(); },
UPGRADE_ATTEMPTS);
}
Node_handle node(Path const &path) override
{
return Genode::retry<Out_of_metadata>(
[&] () { return Session_client::node(path); },
[&] () { upgrade_ram(); },
UPGRADE_ATTEMPTS);
}
};
#endif /* _INCLUDE__FILE_SYSTEM_SESSION__CONNECTION_H_ */