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5dae85afe7
Before this change, we would sometimes map a region into the address space with !is_shared(), and then moments later call set_shared(true). I found this very confusing while debugging, so this patch makes us pass the initial shared flag to the Region constructor, ensuring that it's in the correct state by the time we first map the region.
120 lines
4.2 KiB
C++
120 lines
4.2 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/StringView.h>
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#include <Kernel/FileSystem/FileDescription.h>
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#include <Kernel/FileSystem/Inode.h>
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#include <Kernel/FileSystem/InodeFile.h>
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#include <Kernel/FileSystem/VirtualFileSystem.h>
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#include <Kernel/Process.h>
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#include <Kernel/VM/PrivateInodeVMObject.h>
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#include <Kernel/VM/SharedInodeVMObject.h>
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namespace Kernel {
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InodeFile::InodeFile(NonnullRefPtr<Inode>&& inode)
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: m_inode(move(inode))
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{
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}
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InodeFile::~InodeFile()
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{
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}
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KResultOr<size_t> InodeFile::read(FileDescription& description, size_t offset, UserOrKernelBuffer& buffer, size_t count)
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{
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ssize_t nread = m_inode->read_bytes(offset, count, buffer, &description);
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if (nread > 0) {
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Thread::current()->did_file_read(nread);
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evaluate_block_conditions();
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}
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if (nread < 0)
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return KResult(nread);
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return nread;
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}
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KResultOr<size_t> InodeFile::write(FileDescription& description, size_t offset, const UserOrKernelBuffer& data, size_t count)
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{
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ssize_t nwritten = m_inode->write_bytes(offset, count, data, &description);
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if (nwritten > 0) {
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m_inode->set_mtime(kgettimeofday().tv_sec);
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Thread::current()->did_file_write(nwritten);
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evaluate_block_conditions();
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}
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if (nwritten < 0)
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return KResult(nwritten);
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return nwritten;
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}
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KResultOr<Region*> InodeFile::mmap(Process& process, FileDescription& description, VirtualAddress preferred_vaddr, size_t offset, size_t size, int prot, bool shared)
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{
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// FIXME: If PROT_EXEC, check that the underlying file system isn't mounted noexec.
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RefPtr<InodeVMObject> vmobject;
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if (shared)
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vmobject = SharedInodeVMObject::create_with_inode(inode());
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else
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vmobject = PrivateInodeVMObject::create_with_inode(inode());
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if (!vmobject)
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return KResult(-ENOMEM);
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auto* region = process.allocate_region_with_vmobject(preferred_vaddr, size, *vmobject, offset, description.absolute_path(), prot, shared);
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if (!region)
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return KResult(-ENOMEM);
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return region;
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}
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String InodeFile::absolute_path(const FileDescription& description) const
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{
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ASSERT_NOT_REACHED();
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ASSERT(description.custody());
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return description.absolute_path();
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}
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KResult InodeFile::truncate(u64 size)
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{
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auto truncate_result = m_inode->truncate(size);
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if (truncate_result.is_error())
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return truncate_result;
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int mtime_result = m_inode->set_mtime(kgettimeofday().tv_sec);
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if (mtime_result != 0)
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return KResult(mtime_result);
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return KSuccess;
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}
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KResult InodeFile::chown(FileDescription& description, uid_t uid, gid_t gid)
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{
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ASSERT(description.inode() == m_inode);
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ASSERT(description.custody());
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return VFS::the().chown(*description.custody(), uid, gid);
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}
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KResult InodeFile::chmod(FileDescription& description, mode_t mode)
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{
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ASSERT(description.inode() == m_inode);
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ASSERT(description.custody());
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return VFS::the().chmod(*description.custody(), mode);
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}
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}
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