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Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <AK/StringView.h>
28#include <Kernel/FileSystem/FileDescription.h>
29#include <Kernel/FileSystem/Inode.h>
30#include <Kernel/FileSystem/InodeFile.h>
31#include <Kernel/FileSystem/VirtualFileSystem.h>
32#include <Kernel/Process.h>
33#include <Kernel/VM/PrivateInodeVMObject.h>
34#include <Kernel/VM/SharedInodeVMObject.h>
35
36namespace Kernel {
37
38InodeFile::InodeFile(NonnullRefPtr<Inode>&& inode)
39 : m_inode(move(inode))
40{
41}
42
43InodeFile::~InodeFile()
44{
45}
46
47ssize_t InodeFile::read(FileDescription& description, u8* buffer, ssize_t count)
48{
49 ssize_t nread = m_inode->read_bytes(description.offset(), count, buffer, &description);
50 if (nread > 0)
51 Thread::current->did_file_read(nread);
52 return nread;
53}
54
55ssize_t InodeFile::write(FileDescription& description, const u8* data, ssize_t count)
56{
57 ssize_t nwritten = m_inode->write_bytes(description.offset(), count, data, &description);
58 if (nwritten > 0) {
59 m_inode->set_mtime(kgettimeofday().tv_sec);
60 Thread::current->did_file_write(nwritten);
61 }
62 return nwritten;
63}
64
65KResultOr<Region*> InodeFile::mmap(Process& process, FileDescription& description, VirtualAddress preferred_vaddr, size_t offset, size_t size, int prot, bool shared)
66{
67 ASSERT(offset == 0);
68 // FIXME: If PROT_EXEC, check that the underlying file system isn't mounted noexec.
69 RefPtr<InodeVMObject> vmobject;
70 if (shared)
71 vmobject = SharedInodeVMObject::create_with_inode(inode());
72 else
73 vmobject = PrivateInodeVMObject::create_with_inode(inode());
74 if (!vmobject)
75 return KResult(-ENOMEM);
76 auto* region = process.allocate_region_with_vmobject(preferred_vaddr, size, *vmobject, offset, description.absolute_path(), prot);
77 if (!region)
78 return KResult(-ENOMEM);
79 return region;
80}
81
82String InodeFile::absolute_path(const FileDescription& description) const
83{
84 ASSERT_NOT_REACHED();
85 ASSERT(description.custody());
86 return description.absolute_path();
87}
88
89KResult InodeFile::truncate(u64 size)
90{
91 auto truncate_result = m_inode->truncate(size);
92 if (truncate_result.is_error())
93 return truncate_result;
94 int mtime_result = m_inode->set_mtime(kgettimeofday().tv_sec);
95 if (mtime_result != 0)
96 return KResult(mtime_result);
97 return KSuccess;
98}
99
100KResult InodeFile::chown(uid_t uid, gid_t gid)
101{
102 return VFS::the().chown(*m_inode, uid, gid);
103}
104
105KResult InodeFile::chmod(mode_t mode)
106{
107 return VFS::the().chmod(*m_inode, mode);
108}
109
110}