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- /*
- * Copyright (c) 2018-2022, Andreas Kling <kling@serenityos.org>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
- #include <AK/StringView.h>
- #include <Kernel/API/POSIX/errno.h>
- #include <Kernel/FileSystem/Inode.h>
- #include <Kernel/FileSystem/InodeFile.h>
- #include <Kernel/FileSystem/OpenFileDescription.h>
- #include <Kernel/FileSystem/VirtualFileSystem.h>
- #include <Kernel/Memory/PrivateInodeVMObject.h>
- #include <Kernel/Memory/SharedInodeVMObject.h>
- #include <Kernel/Process.h>
- #include <LibC/sys/ioctl_numbers.h>
- namespace Kernel {
- InodeFile::InodeFile(NonnullLockRefPtr<Inode>&& inode)
- : m_inode(move(inode))
- {
- }
- InodeFile::~InodeFile() = default;
- ErrorOr<size_t> InodeFile::read(OpenFileDescription& description, u64 offset, UserOrKernelBuffer& buffer, size_t count)
- {
- if (Checked<off_t>::addition_would_overflow(offset, count))
- return EOVERFLOW;
- auto nread = TRY(m_inode->read_bytes(offset, count, buffer, &description));
- if (nread > 0) {
- Thread::current()->did_file_read(nread);
- evaluate_block_conditions();
- }
- return nread;
- }
- ErrorOr<size_t> InodeFile::write(OpenFileDescription& description, u64 offset, UserOrKernelBuffer const& data, size_t count)
- {
- if (Checked<off_t>::addition_would_overflow(offset, count))
- return EOVERFLOW;
- size_t nwritten = TRY(m_inode->write_bytes(offset, count, data, &description));
- if (nwritten > 0) {
- auto mtime_result = m_inode->update_timestamps({}, {}, kgettimeofday().to_truncated_seconds());
- Thread::current()->did_file_write(nwritten);
- evaluate_block_conditions();
- if (mtime_result.is_error())
- return mtime_result.release_error();
- }
- return nwritten;
- }
- ErrorOr<void> InodeFile::ioctl(OpenFileDescription& description, unsigned request, Userspace<void*> arg)
- {
- switch (request) {
- case FIBMAP: {
- auto current_process_credentials = Process::current().credentials();
- if (!current_process_credentials->is_superuser())
- return EPERM;
- auto user_block_number = static_ptr_cast<int*>(arg);
- int block_number = 0;
- TRY(copy_from_user(&block_number, user_block_number));
- if (block_number < 0)
- return EINVAL;
- auto block_address = TRY(inode().get_block_address(block_number));
- return copy_to_user(user_block_number, &block_address);
- }
- case FIONREAD: {
- int remaining_bytes = inode().size() - description.offset();
- return copy_to_user(static_ptr_cast<int*>(arg), &remaining_bytes);
- }
- default:
- return EINVAL;
- }
- }
- ErrorOr<NonnullLockRefPtr<Memory::VMObject>> InodeFile::vmobject_for_mmap(Process&, Memory::VirtualRange const&, u64&, bool shared)
- {
- if (shared)
- return TRY(Memory::SharedInodeVMObject::try_create_with_inode(inode()));
- return TRY(Memory::PrivateInodeVMObject::try_create_with_inode(inode()));
- }
- ErrorOr<NonnullOwnPtr<KString>> InodeFile::pseudo_path(OpenFileDescription const&) const
- {
- // If it has an inode, then it has a path, and therefore the caller should have been able to get a custody at some point.
- VERIFY_NOT_REACHED();
- }
- ErrorOr<void> InodeFile::truncate(u64 size)
- {
- TRY(m_inode->truncate(size));
- TRY(m_inode->update_timestamps({}, {}, kgettimeofday().to_truncated_seconds()));
- return {};
- }
- ErrorOr<void> InodeFile::sync()
- {
- m_inode->sync();
- return {};
- }
- ErrorOr<void> InodeFile::chown(Credentials const& credentials, OpenFileDescription& description, UserID uid, GroupID gid)
- {
- VERIFY(description.inode() == m_inode);
- VERIFY(description.custody());
- return VirtualFileSystem::the().chown(credentials, *description.custody(), uid, gid);
- }
- ErrorOr<void> InodeFile::chmod(Credentials const& credentials, OpenFileDescription& description, mode_t mode)
- {
- VERIFY(description.inode() == m_inode);
- VERIFY(description.custody());
- return VirtualFileSystem::the().chmod(credentials, *description.custody(), mode);
- }
- }
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