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Fs_log: new truncate behavior

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Files are truncated at the next client session if all previous sessions
associated with the file are closed.

Issue #1538
This commit is contained in:
Emery Hemingway 2015-10-04 12:19:22 +02:00 committed by Christian Helmuth
parent 77c00bc26d
commit 88f107e0f9
3 changed files with 32 additions and 7 deletions
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9
repos/os/src/server/fs_log/log_file.h
View File

@ -36,6 +36,7 @@ class Fs_log::Log_file : public List<Log_file>::Element
File_system::Session &_fs;
File_handle _handle;
seek_off_t _offset;
int _clients;
public:
@ -46,12 +47,14 @@ class Fs_log::Log_file : public List<Log_file>::Element
char const *dir_path, char const *file_name,
seek_off_t offset)
:
_fs(fs), _handle(handle), _offset(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
@ -59,6 +62,10 @@ class Fs_log::Log_file : public List<Log_file>::Element
(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.
*/

10
repos/os/src/server/fs_log/main.cc
View File

@ -212,6 +212,16 @@ class Fs_log::Root_component :
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:
/**

20
repos/os/src/server/fs_log/session.h
View File

@ -33,15 +33,24 @@ namespace Fs_log {
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
{
private:
Log_file &_log_file;
public:
@ -49,7 +58,7 @@ class Fs_log::Unlabeled_session_component : public Session_component
* Constructor
*/
Unlabeled_session_component(Log_file &log_file)
: _log_file(log_file) { }
: Session_component(log_file) { }
/*****************
** Log session **
@ -75,7 +84,6 @@ class Fs_log::Labeled_session_component : public Session_component
char _label[Log_session::String::MAX_SIZE];
size_t _label_len;
Log_file &_log_file;
public:
@ -83,7 +91,7 @@ class Fs_log::Labeled_session_component : public Session_component
* Constructor
*/
Labeled_session_component(char const *label, Log_file &log_file)
: _log_file(log_file)
: Session_component(log_file)
{
snprintf(_label, sizeof(_label), "[%s] ", label);
_label_len = strlen(_label);