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Kernel: Don't hog file descriptor table lock in sys$listen()

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We don't need to hold the lock across the entire syscall. Once we've
fetched the open file description we're interested in, we can let go.
This commit is contained in:
Andreas Kling 2022-04-03 22:18:57 +02:00
parent bc4282c773
commit 85ceab1fec
1 changed files with 9 additions and 11 deletions
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4
Kernel/Syscalls/socket.cpp
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@ -67,8 +67,7 @@ ErrorOr<FlatPtr> Process::sys$listen(int sockfd, int backlog)
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this) VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
if (backlog < 0) if (backlog < 0)
return EINVAL; return EINVAL;
return m_fds.with_exclusive([&](auto& fds) -> ErrorOr<FlatPtr> { auto description = TRY(open_file_description(sockfd));
auto description = TRY(fds.open_file_description(sockfd));
if (!description->is_socket()) if (!description->is_socket())
return ENOTSOCK; return ENOTSOCK;
auto& socket = *description->socket(); auto& socket = *description->socket();
@ -77,7 +76,6 @@ ErrorOr<FlatPtr> Process::sys$listen(int sockfd, int backlog)
return EINVAL; return EINVAL;
TRY(socket.listen(backlog)); TRY(socket.listen(backlog));
return 0; return 0;
});
} }
ErrorOr<FlatPtr> Process::sys$accept4(Userspace<Syscall::SC_accept4_params const*> user_params) ErrorOr<FlatPtr> Process::sys$accept4(Userspace<Syscall::SC_accept4_params const*> user_params)