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vfs: handle submit_ready signal in fs adapter

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to avoid starvation.

Issue #2664
This commit is contained in:
Alexander Boettcher 2018-02-01 15:21:46 +01:00 committed by Norman Feske
parent 4a3fc21ada
commit f05c4df36a
1 changed files with 11 additions and 1 deletions
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12
repos/os/src/lib/vfs/fs_file_system.h
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@ -506,6 +506,12 @@ class Vfs::Fs_file_system : public File_system
return count;
}
void _ready_to_submit()
{
/* notify anyone who might have failed on write() ready_to_submit */
_post_signal_hook.arm(nullptr);
}
void _handle_ack()
{
::File_system::Session::Tx::Source &source = *_fs.tx();
@ -535,7 +541,7 @@ class Vfs::Fs_file_system : public File_system
case Packet_descriptor::WRITE:
/*
* Notify anyone who might have failed on
* 'alloc_packet()' or 'submit_packet()'
* 'alloc_packet()'
*/
_post_signal_hook.arm(nullptr);
@ -565,6 +571,9 @@ class Vfs::Fs_file_system : public File_system
Genode::Io_signal_handler<Fs_file_system> _ack_handler {
_env.ep(), *this, &Fs_file_system::_handle_ack };
Genode::Io_signal_handler<Fs_file_system> _ready_handler {
_env.ep(), *this, &Fs_file_system::_ready_to_submit };
public:
Fs_file_system(Genode::Env &env,
@ -583,6 +592,7 @@ class Vfs::Fs_file_system : public File_system
::File_system::DEFAULT_TX_BUF_SIZE)
{
_fs.sigh_ack_avail(_ack_handler);
_fs.sigh_ready_to_submit(_ready_handler);
}
/*********************************