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3692af528e
There's no point in constructing an object just for the sake of keeping a state that can be touched by anything in the kernel code. Let's reduce everything to be in a C++ namespace called with the previous name "VirtualFileSystem" and keep a smaller textual-footprint struct called "VirtualFileSystemDetails". This change also cleans up old "friend class" statements that were no longer needed, and move methods from the VirtualFileSystem code to more appropriate places as well. Please note that the method of locking all filesystems during shutdown is removed, as in that place there's no meaning to actually locking all filesystems because of running in kernel mode entirely.
59 lines
1.9 KiB
C++
59 lines
1.9 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/RefPtr.h>
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#include <Kernel/FileSystem/Custody.h>
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#include <Kernel/FileSystem/VirtualFileSystem.h>
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#include <Kernel/Tasks/Process.h>
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namespace Kernel {
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ErrorOr<FlatPtr> Process::sys$chdir(Userspace<char const*> user_path, size_t path_length)
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this);
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TRY(require_promise(Pledge::rpath));
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auto path = TRY(get_syscall_path_argument(user_path, path_length));
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RefPtr<Custody> new_directory = TRY(VirtualFileSystem::open_directory(vfs_root_context(), credentials(), path->view(), current_directory()));
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m_current_directory.with([&](auto& current_directory) {
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// NOTE: We use swap() here to avoid manipulating the ref counts while holding the lock.
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swap(current_directory, new_directory);
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});
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return 0;
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}
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ErrorOr<FlatPtr> Process::sys$fchdir(int fd)
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this);
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TRY(require_promise(Pledge::stdio));
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auto description = TRY(open_file_description(fd));
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if (!description->is_directory())
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return ENOTDIR;
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if (!description->metadata().may_execute(credentials()))
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return EACCES;
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m_current_directory.with([&](auto& current_directory) {
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current_directory = description->custody();
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});
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return 0;
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}
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ErrorOr<FlatPtr> Process::sys$getcwd(Userspace<char*> buffer, size_t size)
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this);
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TRY(require_promise(Pledge::rpath));
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if (size > NumericLimits<ssize_t>::max())
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return EINVAL;
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auto path = TRY(current_directory()->try_serialize_absolute_path());
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size_t ideal_size = path->length() + 1;
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auto size_to_copy = min(ideal_size, size);
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TRY(copy_to_user(buffer, path->characters(), size_to_copy));
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// Note: we return the whole size here, not the copied size.
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return ideal_size;
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}
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}
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