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Kernel: Don't copy a Vector<FileDescriptionAndFlags>

Browse source 
Instead of copying a Vector everytime we need to enumerate a Process'
file descriptions, we can just temporarily lock so it won't change.
This commit is contained in:
Liav A 2021-06-22 21:22:17 +03:00 • committed by Andreas Kling
parent 12b6e69150
commit 7c87891c06
28 changed files with 198 additions and 128 deletions
Download patch file Download diff file Expand all files Collapse all files

2
Kernel/Syscalls/anon_create.cpp
View file

@ -24,7 +24,7 @@ KResultOr<FlatPtr> Process::sys$anon_create(size_t size, int options)
if (size > NumericLimits<ssize_t>::max())
return EINVAL;
int new_fd = alloc_fd();
int new_fd = m_fds.allocate();
if (new_fd < 0)
return new_fd;

2
Kernel/Syscalls/chdir.cpp
View file

@ -27,7 +27,7 @@ KResultOr<FlatPtr> Process::sys$chdir(Userspace<const char*> user_path, size_t p
KResultOr<FlatPtr> Process::sys$fchdir(int fd)
{
REQUIRE_PROMISE(stdio);
auto description = file_description(fd);
auto description = fds().file_description(fd);
if (!description)
return EBADF;

2
Kernel/Syscalls/chmod.cpp
View file

@ -23,7 +23,7 @@ KResultOr<FlatPtr> Process::sys$chmod(Userspace<const char*> user_path, size_t p
KResultOr<FlatPtr> Process::sys$fchmod(int fd, mode_t mode)
{
REQUIRE_PROMISE(fattr);
auto description = file_description(fd);
auto description = fds().file_description(fd);
if (!description)
return EBADF;
return description->chmod(mode);

2
Kernel/Syscalls/chown.cpp
View file

@ -12,7 +12,7 @@ namespace Kernel {
KResultOr<FlatPtr> Process::sys$fchown(int fd, uid_t uid, gid_t gid)
{
REQUIRE_PROMISE(chown);
auto description = file_description(fd);
auto description = fds().file_description(fd);
if (!description)
return EBADF;
return description->chown(uid, gid);

4
Kernel/Syscalls/dup2.cpp
View file

@ -12,12 +12,12 @@ namespace Kernel {
KResultOr<FlatPtr> Process::sys$dup2(int old_fd, int new_fd)
{
REQUIRE_PROMISE(stdio);
auto description = file_description(old_fd);
auto description = fds().file_description(old_fd);
if (!description)
return EBADF;
if (old_fd == new_fd)
return new_fd;
if (new_fd < 0 || new_fd >= m_max_open_file_descriptors)
if (new_fd < 0 || static_cast<size_t>(new_fd) >= fds().max_open())
return EINVAL;
m_fds[new_fd].set(*description);
return new_fd;

11
Kernel/Syscalls/execve.cpp
View file

@ -573,15 +573,14 @@ KResult Process::do_exec(NonnullRefPtr<FileDescription> main_program_description
clear_futex_queues_on_exec();
for (size_t i = 0; i < m_fds.size(); ++i) {
auto& description_and_flags = m_fds[i];
if (description_and_flags.description() && description_and_flags.flags() & FD_CLOEXEC)
description_and_flags = {};
}
fds().change_each([&](auto& file_description_metadata) {
if (file_description_metadata.is_valid() && file_description_metadata.flags() & FD_CLOEXEC)
file_description_metadata = {};
});
int main_program_fd = -1;
if (interpreter_description) {
main_program_fd = alloc_fd();
main_program_fd = m_fds.allocate();
VERIFY(main_program_fd >= 0);
auto seek_result = main_program_description->seek(0, SEEK_SET);
VERIFY(!seek_result.is_error());

4
Kernel/Syscalls/fcntl.cpp
View file

@ -14,7 +14,7 @@ KResultOr<FlatPtr> Process::sys$fcntl(int fd, int cmd, u32 arg)
{
REQUIRE_PROMISE(stdio);
dbgln_if(IO_DEBUG, "sys$fcntl: fd={}, cmd={}, arg={}", fd, cmd, arg);
auto description = file_description(fd);
auto description = fds().file_description(fd);
if (!description)
return EBADF;
// NOTE: The FD flags are not shared between FileDescription objects.
@ -24,7 +24,7 @@ KResultOr<FlatPtr> Process::sys$fcntl(int fd, int cmd, u32 arg)
int arg_fd = (int)arg;
if (arg_fd < 0)
return EINVAL;
int new_fd = alloc_fd(arg_fd);
int new_fd = fds().allocate(arg_fd);
if (new_fd < 0)
return new_fd;
m_fds[new_fd].set(*description);

2
Kernel/Syscalls/ftruncate.cpp
View file

@ -17,7 +17,7 @@ KResultOr<FlatPtr> Process::sys$ftruncate(int fd, Userspace<off_t*> userspace_le
return EFAULT;
if (length < 0)
return EINVAL;
auto description = file_description(fd);
auto description = fds().file_description(fd);
if (!description)
return EBADF;
if (!description->is_writable())

2
Kernel/Syscalls/get_dir_entries.cpp
View file

@ -14,7 +14,7 @@ KResultOr<FlatPtr> Process::sys$get_dir_entries(int fd, Userspace<void*> user_bu
REQUIRE_PROMISE(stdio);
if (user_size > NumericLimits<ssize_t>::max())
return EINVAL;
auto description = file_description(fd);
auto description = fds().file_description(fd);
if (!description)
return EBADF;
auto buffer = UserOrKernelBuffer::for_user_buffer(user_buffer, static_cast<size_t>(user_size));

6
Kernel/Syscalls/inode_watcher.cpp
View file

@ -17,7 +17,7 @@ KResultOr<FlatPtr> Process::sys$create_inode_watcher(u32 flags)
{
REQUIRE_PROMISE(rpath);
int fd = alloc_fd();
int fd = m_fds.allocate();
if (fd < 0)
return fd;
@ -48,7 +48,7 @@ KResultOr<FlatPtr> Process::sys$inode_watcher_add_watch(Userspace<const Syscall:
if (!copy_from_user(&params, user_params))
return EFAULT;
auto description = file_description(params.fd);
auto description = fds().file_description(params.fd);
if (!description)
return EBADF;
if (!description->is_inode_watcher())
@ -75,7 +75,7 @@ KResultOr<FlatPtr> Process::sys$inode_watcher_add_watch(Userspace<const Syscall:
KResultOr<FlatPtr> Process::sys$inode_watcher_remove_watch(int fd, int wd)
{
auto description = file_description(fd);
auto description = fds().file_description(fd);
if (!description)
return EBADF;
if (!description->is_inode_watcher())

2
Kernel/Syscalls/ioctl.cpp
View file

@ -12,7 +12,7 @@ namespace Kernel {
KResultOr<FlatPtr> Process::sys$ioctl(int fd, unsigned request, FlatPtr arg)
{
auto description = file_description(fd);
auto description = fds().file_description(fd);
if (!description)
return EBADF;
if (request == FIONBIO) {

2
Kernel/Syscalls/lseek.cpp
View file

@ -12,7 +12,7 @@ namespace Kernel {
KResultOr<FlatPtr> Process::sys$lseek(int fd, Userspace<off_t*> userspace_offset, int whence)
{
REQUIRE_PROMISE(stdio);
auto description = file_description(fd);
auto description = fds().file_description(fd);
if (!description)
return EBADF;
off_t offset;

2
Kernel/Syscalls/mmap.cpp
View file

@ -224,7 +224,7 @@ KResultOr<FlatPtr> Process::sys$mmap(Userspace<const Syscall::SC_mmap_params*> u
return EINVAL;
if (static_cast<size_t>(offset) & ~PAGE_MASK)
return EINVAL;
auto description = file_description(fd);
auto description = fds().file_description(fd);
if (!description)
return EBADF;
if (description->is_directory())

2
Kernel/Syscalls/mount.cpp
View file

@ -36,7 +36,7 @@ KResultOr<FlatPtr> Process::sys$mount(Userspace<const Syscall::SC_mount_params*>
if (fs_type.is_null())
return EFAULT;
auto description = file_description(source_fd);
auto description = fds().file_description(source_fd);
if (!description.is_null())
dbgln("mount {}: source fd {} @ {}", fs_type, source_fd, target);
else

6
Kernel/Syscalls/open.cpp
View file

@ -44,7 +44,7 @@ KResultOr<FlatPtr> Process::sys$open(Userspace<const Syscall::SC_open_params*> u
return path.error();
dbgln_if(IO_DEBUG, "sys$open(dirfd={}, path='{}', options={}, mode={})", dirfd, path.value()->view(), options, mode);
int fd = alloc_fd();
int fd = m_fds.allocate();
if (fd < 0)
return fd;
@ -52,7 +52,7 @@ KResultOr<FlatPtr> Process::sys$open(Userspace<const Syscall::SC_open_params*> u
if (dirfd == AT_FDCWD) {
base = current_directory();
} else {
auto base_description = file_description(dirfd);
auto base_description = fds().file_description(dirfd);
if (!base_description)
return EBADF;
if (!base_description->is_directory())
@ -78,7 +78,7 @@ KResultOr<FlatPtr> Process::sys$open(Userspace<const Syscall::SC_open_params*> u
KResultOr<FlatPtr> Process::sys$close(int fd)
{
REQUIRE_PROMISE(stdio);
auto description = file_description(fd);
auto description = fds().file_description(fd);
dbgln_if(IO_DEBUG, "sys$close({}) {}", fd, description.ptr());
if (!description)
return EBADF;

6
Kernel/Syscalls/pipe.cpp
View file

@ -13,7 +13,7 @@ namespace Kernel {
KResultOr<FlatPtr> Process::sys$pipe(int pipefd[2], int flags)
{
REQUIRE_PROMISE(stdio);
if (number_of_open_file_descriptors() + 2 > max_open_file_descriptors())
if (fds().open_count() + 2 > fds().max_open())
return EMFILE;
// Reject flags other than O_CLOEXEC.
if ((flags & O_CLOEXEC) != flags)
@ -29,13 +29,13 @@ KResultOr<FlatPtr> Process::sys$pipe(int pipefd[2], int flags)
if (open_writer_result.is_error())
return open_writer_result.error();
int reader_fd = alloc_fd();
int reader_fd = m_fds.allocate();
m_fds[reader_fd].set(open_reader_result.release_value(), fd_flags);
m_fds[reader_fd].description()->set_readable(true);
if (!copy_to_user(&pipefd[0], &reader_fd))
return EFAULT;
int writer_fd = alloc_fd();
int writer_fd = m_fds.allocate();
m_fds[writer_fd].set(open_writer_result.release_value(), fd_flags);
m_fds[writer_fd].description()->set_writable(true);
if (!copy_to_user(&pipefd[1], &writer_fd))

4
Kernel/Syscalls/read.cpp
View file

@ -34,7 +34,7 @@ KResultOr<FlatPtr> Process::sys$readv(int fd, Userspace<const struct iovec*> iov
return EINVAL;
}
auto description = file_description(fd);
auto description = fds().file_description(fd);
if (!description)
return EBADF;
@ -76,7 +76,7 @@ KResultOr<FlatPtr> Process::sys$read(int fd, Userspace<u8*> buffer, size_t size)
if (size > NumericLimits<ssize_t>::max())
return EINVAL;
dbgln_if(IO_DEBUG, "sys$read({}, {}, {})", fd, buffer.ptr(), size);
auto description = file_description(fd);
auto description = fds().file_description(fd);
if (!description)
return EBADF;
if (!description->is_readable())

16
Kernel/Syscalls/select.cpp
View file

@ -61,7 +61,7 @@ KResultOr<FlatPtr> Process::sys$select(Userspace<const Syscall::SC_select_params
return EFAULT;
Thread::SelectBlocker::FDVector fds_info;
Vector<int, FD_SETSIZE> fds;
Vector<int, FD_SETSIZE> selected_fds;
for (int fd = 0; fd < params.nfds; fd++) {
auto block_flags = BlockFlags::None;
if (params.readfds && FD_ISSET(fd, &fds_read))
@ -73,14 +73,14 @@ KResultOr<FlatPtr> Process::sys$select(Userspace<const Syscall::SC_select_params
if (block_flags == BlockFlags::None)
continue;
auto description = file_description(fd);
auto description = fds().file_description(fd);
if (!description) {
dbgln("sys$select: Bad fd number {}", fd);
return EBADF;
}
if (!fds_info.try_append({ description.release_nonnull(), block_flags }))
return ENOMEM;
if (!fds.try_append(fd))
if (!selected_fds.try_append(fd))
return ENOMEM;
}
@ -105,15 +105,15 @@ KResultOr<FlatPtr> Process::sys$select(Userspace<const Syscall::SC_select_params
if (fd_entry.unblocked_flags == BlockFlags::None)
continue;
if (params.readfds && has_flag(fd_entry.unblocked_flags, BlockFlags::Read)) {
FD_SET(fds[i], &fds_read);
FD_SET(selected_fds[i], &fds_read);
marked_fd_count++;
}
if (params.writefds && has_flag(fd_entry.unblocked_flags, BlockFlags::Write)) {
FD_SET(fds[i], &fds_write);
FD_SET(selected_fds[i], &fds_write);
marked_fd_count++;
}
if (params.exceptfds && has_flag(fd_entry.unblocked_flags, BlockFlags::Exception)) {
FD_SET(fds[i], &fds_except);
FD_SET(selected_fds[i], &fds_except);
marked_fd_count++;
}
}
@ -135,7 +135,7 @@ KResultOr<FlatPtr> Process::sys$poll(Userspace<const Syscall::SC_poll_params*> u
if (!copy_from_user(&params, user_params))
return EFAULT;
if (params.nfds >= m_max_open_file_descriptors)
if (params.nfds >= fds().max_open())
return ENOBUFS;
Thread::BlockTimeout timeout;
@ -165,7 +165,7 @@ KResultOr<FlatPtr> Process::sys$poll(Userspace<const Syscall::SC_poll_params*> u
Thread::SelectBlocker::FDVector fds_info;
for (size_t i = 0; i < params.nfds; i++) {
auto& pfd = fds_copy[i];
auto description = file_description(pfd.fd);
auto description = fds().file_description(pfd.fd);
if (!description) {
dbgln("sys$poll: Bad fd number {}", pfd.fd);
return EBADF;

8
Kernel/Syscalls/sendfd.cpp
View file

@ -13,7 +13,7 @@ namespace Kernel {
KResultOr<FlatPtr> Process::sys$sendfd(int sockfd, int fd)
{
REQUIRE_PROMISE(sendfd);
auto socket_description = file_description(sockfd);
auto socket_description = fds().file_description(sockfd);
if (!socket_description)
return EBADF;
if (!socket_description->is_socket())
@ -24,7 +24,7 @@ KResultOr<FlatPtr> Process::sys$sendfd(int sockfd, int fd)
if (!socket.is_connected())
return ENOTCONN;
auto passing_descriptor = file_description(fd);
auto passing_descriptor = fds().file_description(fd);
if (!passing_descriptor)
return EBADF;
@ -35,7 +35,7 @@ KResultOr<FlatPtr> Process::sys$sendfd(int sockfd, int fd)
KResultOr<FlatPtr> Process::sys$recvfd(int sockfd, int options)
{
REQUIRE_PROMISE(recvfd);
auto socket_description = file_description(sockfd);
auto socket_description = fds().file_description(sockfd);
if (!socket_description)
return EBADF;
if (!socket_description->is_socket())
@ -44,7 +44,7 @@ KResultOr<FlatPtr> Process::sys$recvfd(int sockfd, int options)
if (!socket.is_local())
return EAFNOSUPPORT;
int new_fd = alloc_fd();
int new_fd = m_fds.allocate();
if (new_fd < 0)
return new_fd;

30
Kernel/Syscalls/socket.cpp
View file

@ -38,7 +38,7 @@ KResultOr<FlatPtr> Process::sys$socket(int domain, int type, int protocol)
if ((type & SOCK_TYPE_MASK) == SOCK_RAW && !is_superuser())
return EACCES;
int fd = alloc_fd();
int fd = m_fds.allocate();
if (fd < 0)
return fd;
auto result = Socket::create(domain, type, protocol);
@ -53,7 +53,7 @@ KResultOr<FlatPtr> Process::sys$socket(int domain, int type, int protocol)
KResultOr<FlatPtr> Process::sys$bind(int sockfd, Userspace<const sockaddr*> address, socklen_t address_length)
{
auto description = file_description(sockfd);
auto description = fds().file_description(sockfd);
if (!description)
return EBADF;
if (!description->is_socket())
@ -67,7 +67,7 @@ KResultOr<FlatPtr> Process::sys$listen(int sockfd, int backlog)
{
if (backlog < 0)
return EINVAL;
auto description = file_description(sockfd);
auto description = fds().file_description(sockfd);
if (!description)
return EBADF;
if (!description->is_socket())
@ -96,10 +96,10 @@ KResultOr<FlatPtr> Process::sys$accept4(Userspace<const Syscall::SC_accept4_para
if (user_address && !copy_from_user(&address_size, static_ptr_cast<const socklen_t*>(user_address_size)))
return EFAULT;
int accepted_socket_fd = alloc_fd();
int accepted_socket_fd = m_fds.allocate();
if (accepted_socket_fd < 0)
return accepted_socket_fd;
auto accepting_socket_description = file_description(accepting_socket_fd);
auto accepting_socket_description = fds().file_description(accepting_socket_fd);
if (!accepting_socket_description)
return EBADF;
if (!accepting_socket_description->is_socket())
@ -148,10 +148,10 @@ KResultOr<FlatPtr> Process::sys$accept4(Userspace<const Syscall::SC_accept4_para
KResultOr<FlatPtr> Process::sys$connect(int sockfd, Userspace<const sockaddr*> user_address, socklen_t user_address_size)
{
int fd = alloc_fd();
int fd = m_fds.allocate();
if (fd < 0)
return fd;
auto description = file_description(sockfd);
auto description = fds().file_description(sockfd);
if (!description)
return EBADF;
if (!description->is_socket())
@ -168,7 +168,7 @@ KResultOr<FlatPtr> Process::sys$shutdown(int sockfd, int how)
REQUIRE_PROMISE(stdio);
if (how & ~SHUT_RDWR)
return EINVAL;
auto description = file_description(sockfd);
auto description = fds().file_description(sockfd);
if (!description)
return EBADF;
if (!description->is_socket())
@ -199,7 +199,7 @@ KResultOr<FlatPtr> Process::sys$sendmsg(int sockfd, Userspace<const struct msghd
Userspace<const sockaddr*> user_addr((FlatPtr)msg.msg_name);
socklen_t addr_length = msg.msg_namelen;
auto description = file_description(sockfd);
auto description = fds().file_description(sockfd);
if (!description)
return EBADF;
if (!description->is_socket())
@ -236,7 +236,7 @@ KResultOr<FlatPtr> Process::sys$recvmsg(int sockfd, Userspace<struct msghdr*> us
Userspace<sockaddr*> user_addr((FlatPtr)msg.msg_name);
Userspace<socklen_t*> user_addr_length(msg.msg_name ? (FlatPtr)&user_msg.unsafe_userspace_ptr()->msg_namelen : 0);
auto description = file_description(sockfd);
auto description = fds().file_description(sockfd);
if (!description)
return EBADF;
if (!description->is_socket())
@ -301,7 +301,7 @@ int Process::get_sock_or_peer_name(const Params& params)
if (addrlen_value <= 0)
return EINVAL;
auto description = file_description(params.sockfd);
auto description = fds().file_description(params.sockfd);
if (!description)
return EBADF;
@ -356,7 +356,7 @@ KResultOr<FlatPtr> Process::sys$getsockopt(Userspace<const Syscall::SC_getsockop
if (!copy_from_user(&value_size, params.value_size, sizeof(socklen_t)))
return EFAULT;
auto description = file_description(sockfd);
auto description = fds().file_description(sockfd);
if (!description)
return EBADF;
if (!description->is_socket())
@ -373,7 +373,7 @@ KResultOr<FlatPtr> Process::sys$setsockopt(Userspace<const Syscall::SC_setsockop
if (!copy_from_user(&params, user_params))
return EFAULT;
Userspace<const void*> user_value((FlatPtr)params.value);
auto description = file_description(params.sockfd);
auto description = fds().file_description(params.sockfd);
if (!description)
return EBADF;
if (!description->is_socket())
@ -401,12 +401,12 @@ KResultOr<FlatPtr> Process::sys$socketpair(Userspace<const Syscall::SC_socketpai
auto pair = result.value();
int fds[2];
fds[0] = alloc_fd();
fds[0] = m_fds.allocate();
if (fds[0] < 0)
return ENFILE;
setup_socket_fd(fds[0], pair.description1, params.type);
fds[1] = alloc_fd();
fds[1] = m_fds.allocate();
if (fds[1] < 0) {
// FIXME: This leaks fds[0]
return ENFILE;

4
Kernel/Syscalls/stat.cpp
View file

@ -15,7 +15,7 @@ namespace Kernel {
KResultOr<FlatPtr> Process::sys$fstat(int fd, Userspace<stat*> user_statbuf)
{
REQUIRE_PROMISE(stdio);
auto description = file_description(fd);
auto description = fds().file_description(fd);
if (!description)
return EBADF;
stat buffer = {};
@ -38,7 +38,7 @@ KResultOr<FlatPtr> Process::sys$stat(Userspace<const Syscall::SC_stat_params*> u
if (params.dirfd == AT_FDCWD) {
base = current_directory();
} else {
auto base_description = file_description(params.dirfd);
auto base_description = fds().file_description(params.dirfd);
if (!base_description)
return EBADF;
if (!base_description->is_directory())

2
Kernel/Syscalls/statvfs.cpp
View file

@ -87,7 +87,7 @@ KResultOr<FlatPtr> Process::sys$fstatvfs(int fd, statvfs* buf)
{
REQUIRE_PROMISE(stdio);
auto description = file_description(fd);
auto description = fds().file_description(fd);
if (!description)
return EBADF;

2
Kernel/Syscalls/sysconf.cpp
View file

@ -18,7 +18,7 @@ KResultOr<FlatPtr> Process::sys$sysconf(int name)
case _SC_NPROCESSORS_ONLN:
return Processor::processor_count();
case _SC_OPEN_MAX:
return max_open_file_descriptors();
return fds().max_open();
case _SC_PAGESIZE:
return PAGE_SIZE;
case _SC_TTY_NAME_MAX:

4
Kernel/Syscalls/ttyname.cpp
View file

@ -14,7 +14,7 @@ namespace Kernel {
KResultOr<FlatPtr> Process::sys$ttyname(int fd, Userspace<char*> buffer, size_t size)
{
REQUIRE_PROMISE(tty);
auto description = file_description(fd);
auto description = fds().file_description(fd);
if (!description)
return EBADF;
if (!description->is_tty())
@ -30,7 +30,7 @@ KResultOr<FlatPtr> Process::sys$ttyname(int fd, Userspace<char*> buffer, size_t
KResultOr<FlatPtr> Process::sys$ptsname(int fd, Userspace<char*> buffer, size_t size)
{
REQUIRE_PROMISE(tty);
auto description = file_description(fd);
auto description = fds().file_description(fd);
if (!description)
return EBADF;
auto* master_pty = description->master_pty();

4
Kernel/Syscalls/write.cpp
View file

@ -33,7 +33,7 @@ KResultOr<FlatPtr> Process::sys$writev(int fd, Userspace<const struct iovec*> io
return EINVAL;
}
auto description = file_description(fd);
auto description = fds().file_description(fd);
if (!description)
return EBADF;
@ -105,7 +105,7 @@ KResultOr<FlatPtr> Process::sys$write(int fd, Userspace<const u8*> data, size_t
return EINVAL;
dbgln_if(IO_DEBUG, "sys$write({}, {}, {})", fd, data.ptr(), size);
auto description = file_description(fd);
auto description = fds().file_description(fd);
if (!description)
return EBADF;
if (!description->is_writable())