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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/StringView.h>
#include <Kernel/FileSystem/FileDescription.h>
#include <Kernel/FileSystem/Inode.h>
#include <Kernel/FileSystem/InodeFile.h>
#include <Kernel/FileSystem/VirtualFileSystem.h>
#include <Kernel/Process.h>
#include <Kernel/VM/PrivateInodeVMObject.h>
#include <Kernel/VM/SharedInodeVMObject.h>
#include <LibC/errno_numbers.h>
#include <LibC/sys/ioctl_numbers.h>
namespace Kernel {
InodeFile::InodeFile(NonnullRefPtr<Inode>&& inode)
: m_inode(move(inode))
{
}
InodeFile::~InodeFile()
{
}
KResultOr<size_t> InodeFile::read(FileDescription& description, size_t offset, UserOrKernelBuffer& buffer, size_t count)
{
if (Checked<off_t>::addition_would_overflow(offset, count))
return EOVERFLOW;
ssize_t nread = m_inode->read_bytes(offset, count, buffer, &description);
if (nread > 0) {
Thread::current()->did_file_read(nread);
evaluate_block_conditions();
}
if (nread < 0)
return KResult((ErrnoCode)-nread);
return nread;
}
KResultOr<size_t> InodeFile::write(FileDescription& description, size_t offset, const UserOrKernelBuffer& data, size_t count)
{
if (Checked<off_t>::addition_would_overflow(offset, count))
return EOVERFLOW;
ssize_t nwritten = m_inode->write_bytes(offset, count, data, &description);
if (nwritten > 0) {
m_inode->set_mtime(kgettimeofday().to_truncated_seconds());
Thread::current()->did_file_write(nwritten);
evaluate_block_conditions();
}
if (nwritten < 0)
return KResult((ErrnoCode)-nwritten);
return nwritten;
}
int InodeFile::ioctl(FileDescription& description, unsigned request, FlatPtr arg)
{
(void)description;
switch (request) {
case FIBMAP: {
if (!Process::current()->is_superuser())
return -EPERM;
int block_number = 0;
if (!copy_from_user(&block_number, (int*)arg))
return -EFAULT;
if (block_number < 0)
return -EINVAL;
auto block_address = inode().get_block_address(block_number);
if (block_address.is_error())
return block_address.error();
if (!copy_to_user((int*)arg, &block_address.value()))
return -EFAULT;
return 0;
}
default:
return -EINVAL;
}
}
KResultOr<Region*> InodeFile::mmap(Process& process, FileDescription& description, const Range& range, size_t offset, int prot, bool shared)
{
// FIXME: If PROT_EXEC, check that the underlying file system isn't mounted noexec.
RefPtr<InodeVMObject> vmobject;
if (shared)
vmobject = SharedInodeVMObject::create_with_inode(inode());
else
vmobject = PrivateInodeVMObject::create_with_inode(inode());
if (!vmobject)
return ENOMEM;
return process.space().allocate_region_with_vmobject(range, vmobject.release_nonnull(), offset, description.absolute_path(), prot, shared);
}
String InodeFile::absolute_path(const FileDescription& description) const
{
VERIFY_NOT_REACHED();
VERIFY(description.custody());
return description.absolute_path();
}
KResult InodeFile::truncate(u64 size)
{
auto truncate_result = m_inode->truncate(size);
if (truncate_result.is_error())
return truncate_result;
int mtime_result = m_inode->set_mtime(kgettimeofday().to_truncated_seconds());
if (mtime_result < 0)
return KResult((ErrnoCode)-mtime_result);
return KSuccess;
}
KResult InodeFile::chown(FileDescription& description, uid_t uid, gid_t gid)
{
VERIFY(description.inode() == m_inode);
VERIFY(description.custody());
return VFS::the().chown(*description.custody(), uid, gid);
}
KResult InodeFile::chmod(FileDescription& description, mode_t mode)
{
VERIFY(description.inode() == m_inode);
VERIFY(description.custody());
return VFS::the().chmod(*description.custody(), mode);
}
}
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