jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2021, Justin Mietzner <sw1tchbl4d3@sw1tchbl4d3.com>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#include <Kernel/FileSystem/Custody.h>
8#include <Kernel/FileSystem/VirtualFileSystem.h>
9#include <Kernel/Process.h>
10
11namespace Kernel {
12
13ErrorOr<FlatPtr> Process::do_statvfs(FileSystem const& fs, Custody const* custody, statvfs* buf)
14{
15 statvfs kernelbuf = {};
16
17 kernelbuf.f_bsize = static_cast<u64>(fs.block_size());
18 kernelbuf.f_frsize = fs.fragment_size();
19 kernelbuf.f_blocks = fs.total_block_count();
20 kernelbuf.f_bfree = fs.free_block_count();
21
22 // FIXME: Implement "available blocks" into Filesystem
23 kernelbuf.f_bavail = fs.free_block_count();
24
25 kernelbuf.f_files = fs.total_inode_count();
26 kernelbuf.f_ffree = fs.free_inode_count();
27 kernelbuf.f_favail = fs.free_inode_count(); // FIXME: same as f_bavail
28
29 kernelbuf.f_fsid = fs.fsid().value();
30
31 kernelbuf.f_namemax = 255;
32
33 (void)fs.class_name().copy_characters_to_buffer(kernelbuf.f_basetype, FSTYPSZ);
34
35 if (custody)
36 kernelbuf.f_flag = custody->mount_flags();
37
38 TRY(copy_to_user(buf, &kernelbuf));
39 return 0;
40}
41
42ErrorOr<FlatPtr> Process::sys$statvfs(Userspace<Syscall::SC_statvfs_params const*> user_params)
43{
44 VERIFY_NO_PROCESS_BIG_LOCK(this);
45 TRY(require_promise(Pledge::rpath));
46 auto params = TRY(copy_typed_from_user(user_params));
47
48 auto path = TRY(get_syscall_path_argument(params.path));
49
50 auto custody = TRY(VirtualFileSystem::the().resolve_path(credentials(), path->view(), current_directory(), nullptr, 0));
51 auto& inode = custody->inode();
52 auto const& fs = inode.fs();
53
54 return do_statvfs(fs, custody, params.buf);
55}
56
57ErrorOr<FlatPtr> Process::sys$fstatvfs(int fd, statvfs* buf)
58{
59 VERIFY_NO_PROCESS_BIG_LOCK(this);
60 TRY(require_promise(Pledge::stdio));
61
62 auto description = TRY(open_file_description(fd));
63 auto const* inode = description->inode();
64 if (inode == nullptr)
65 return ENOENT;
66
67 // FIXME: The custody that we pass in might be outdated. However, this only affects the mount flags.
68 return do_statvfs(inode->fs(), description->custody(), buf);
69}
70
71}