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https://github.com/RGBCube/serenity
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6af2418de7
VFS no longer deals with inodes in public API, only with custodies and file descriptions. Talk directly to the file system if you need to operate on a inode. In most cases you actually want to go though VFS, to get proper permission check and other niceties. For this to work, you have to provide a custody, which describes *how* you have opened the inode, not just what the inode is.
114 lines
4 KiB
C++
114 lines
4 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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ssize_t InodeFile::read(FileDescription& description, size_t offset, u8* buffer, ssize_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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return nread;
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}
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ssize_t InodeFile::write(FileDescription& description, size_t offset, const u8* data, ssize_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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}
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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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ASSERT(offset == 0);
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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);
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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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