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Kernel: Improve ProcFS behavior in low memory conditions

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When ProcFS could no longer allocate KBuffer objects to serve calls to
read, it would just return 0, indicating EOF. This then triggered
parsing errors because code assumed it read the file.

Because read isn't supposed to return ENOMEM, change ProcFS to populate
the file data upon file open or seek to the beginning. This also means
that calls to open can now return ENOMEM if needed. This allows the
caller to either be able to successfully open the file and read it, or
fail to open it in the first place.
This commit is contained in:
Tom 2020-09-17 13:51:09 -06:00 • committed by Andreas Kling
parent b36f57e570
commit f98ca35b83
24 changed files with 398 additions and 243 deletions
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8
Kernel/Net/IPv4Socket.cpp
View file

@ -170,14 +170,6 @@ KResult IPv4Socket::connect(FileDescription& description, Userspace<const sockad
return protocol_connect(description, should_block);
}
void IPv4Socket::attach(FileDescription&)
{
}
void IPv4Socket::detach(FileDescription&)
{
}
bool IPv4Socket::can_read(const FileDescription&, size_t) const
{
if (m_role == Role::Listener)

2
Kernel/Net/IPv4Socket.h
View file

@ -54,8 +54,6 @@ public:
virtual KResult listen(size_t) override;
virtual void get_local_address(sockaddr*, socklen_t*) override;
virtual void get_peer_address(sockaddr*, socklen_t*) override;
virtual void attach(FileDescription&) override;
virtual void detach(FileDescription&) override;
virtual bool can_read(const FileDescription&, size_t) const override;
virtual bool can_write(const FileDescription&, size_t) const override;
virtual KResultOr<size_t> sendto(FileDescription&, const UserOrKernelBuffer&, size_t, int, Userspace<const sockaddr*>, socklen_t) override;

3
Kernel/Net/LocalSocket.cpp
View file

@ -224,7 +224,7 @@ KResult LocalSocket::listen(size_t backlog)
return KSuccess;
}
void LocalSocket::attach(FileDescription& description)
KResult LocalSocket::attach(FileDescription& description)
{
ASSERT(!m_accept_side_fd_open);
if (m_connect_side_role == Role::None) {
@ -236,6 +236,7 @@ void LocalSocket::attach(FileDescription& description)
}
evaluate_block_conditions();
return KSuccess;
}
void LocalSocket::detach(FileDescription& description)

2
Kernel/Net/LocalSocket.h
View file

@ -56,7 +56,7 @@ public:
virtual KResult listen(size_t) override;
virtual void get_local_address(sockaddr*, socklen_t*) override;
virtual void get_peer_address(sockaddr*, socklen_t*) override;
virtual void attach(FileDescription&) override;
virtual KResult attach(FileDescription&) override;
virtual void detach(FileDescription&) override;
virtual bool can_read(const FileDescription&, size_t) const override;
virtual bool can_write(const FileDescription&, size_t) const override;

2
Kernel/Net/Socket.h
View file

@ -105,8 +105,6 @@ public:
virtual void get_peer_address(sockaddr*, socklen_t*) = 0;
virtual bool is_local() const { return false; }
virtual bool is_ipv4() const { return false; }
virtual void attach(FileDescription&) = 0;
virtual void detach(FileDescription&) = 0;
virtual KResultOr<size_t> sendto(FileDescription&, const UserOrKernelBuffer&, size_t, int flags, Userspace<const sockaddr*>, socklen_t) = 0;
virtual KResultOr<size_t> recvfrom(FileDescription&, UserOrKernelBuffer&, size_t, int flags, Userspace<sockaddr*>, Userspace<socklen_t*>, timeval&) = 0;