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Get rid of Vnode concept.

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We already have an abstraction between Process and Inode/CharacterDevice/FIFO
and it's called FileDescriptor. :^)
This commit is contained in:
Andreas Kling 2019-01-16 12:57:07 +01:00
parent 310a5f4199
commit b46ae2bf09
15 changed files with 204 additions and 376 deletions
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28
Kernel/Process.cpp
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@ -85,9 +85,8 @@ Region* Process::allocate_region(LinearAddress laddr, size_t size, String&& name
return m_regions.last().ptr();
}
Region* Process::allocate_file_backed_region(LinearAddress laddr, size_t size, RetainPtr<Vnode>&& vnode, String&& name, bool is_readable, bool is_writable)
Region* Process::allocate_file_backed_region(LinearAddress laddr, size_t size, RetainPtr<Inode>&& inode, String&& name, bool is_readable, bool is_writable)
{
ASSERT(!vnode->isCharacterDevice());
size = PAGE_ROUND_UP(size);
// FIXME: This needs sanity checks. What if this overlaps existing regions?
if (laddr.is_null()) {
@ -95,7 +94,7 @@ Region* Process::allocate_file_backed_region(LinearAddress laddr, size_t size, R
m_nextRegion = m_nextRegion.offset(size).offset(PAGE_SIZE);
}
laddr.mask(0xfffff000);
m_regions.append(adopt(*new Region(laddr, size, move(vnode), move(name), is_readable, is_writable)));
m_regions.append(adopt(*new Region(laddr, size, move(inode), move(name), is_readable, is_writable)));
MM.map_region(*this, *m_regions.last());
return m_regions.last().ptr();
}
@ -178,14 +177,14 @@ void* Process::sys$mmap(const Syscall::SC_mmap_params* params)
auto* descriptor = file_descriptor(fd);
if (!descriptor)
return (void*)-EBADF;
if (descriptor->vnode()->isCharacterDevice())
if (!descriptor->supports_mmap())
return (void*)-ENODEV;
// FIXME: If PROT_EXEC, check that the underlying file system isn't mounted noexec.
auto region_name = descriptor->absolute_path();
InterruptDisabler disabler;
// FIXME: Implement mapping at a client-specified address. Most of the support is already in plcae.
ASSERT(addr == nullptr);
auto* region = allocate_file_backed_region(LinearAddress(), size, descriptor->vnode(), move(region_name), prot & PROT_READ, prot & PROT_WRITE);
auto* region = allocate_file_backed_region(LinearAddress(), size, descriptor->inode(), move(region_name), prot & PROT_READ, prot & PROT_WRITE);
if (!region)
return (void*)-ENOMEM;
return region->linearAddress.asPtr();
@ -288,7 +287,7 @@ int Process::do_exec(const String& path, Vector<String>&& arguments, Vector<Stri
return -ENOENT;
int error;
auto descriptor = VFS::the().open(path, error, 0, m_cwd ? m_cwd->inode : InodeIdentifier());
auto descriptor = VFS::the().open(path, error, 0, m_cwd ? m_cwd->identifier() : InodeIdentifier());
if (!descriptor) {
ASSERT(error != 0);
return error;
@ -302,7 +301,7 @@ int Process::do_exec(const String& path, Vector<String>&& arguments, Vector<Stri
return -ENOTIMPL;
}
auto vmo = VMObject::create_file_backed(descriptor->vnode(), descriptor->metadata().size);
auto vmo = VMObject::create_file_backed(descriptor->inode(), descriptor->metadata().size);
vmo->set_name(descriptor->absolute_path());
auto* region = allocate_region_with_vmo(LinearAddress(), descriptor->metadata().size, vmo.copyRef(), 0, "helper", true, false);
@ -403,7 +402,7 @@ int Process::do_exec(const String& path, Vector<String>&& arguments, Vector<Stri
m_tss.esp0 = old_esp0;
m_tss.ss2 = m_pid;
m_executable = descriptor->vnode();
m_executable = descriptor->inode();
m_arguments = move(arguments);
m_initialEnvironment = move(environment);
@ -481,14 +480,15 @@ Process* Process::create_user_process(const String& path, uid_t uid, gid_t gid,
if (arguments.is_empty()) {
arguments.append(parts.last());
}
RetainPtr<Vnode> cwd;
RetainPtr<Inode> cwd;
{
InterruptDisabler disabler;
if (auto* parent = Process::from_pid(parent_pid))
cwd = parent->m_cwd.copyRef();
}
if (!cwd)
cwd = VFS::the().root();
cwd = VFS::the().root_inode();
auto* process = new Process(parts.takeLast(), uid, gid, parent_pid, Ring3, move(cwd), nullptr, tty);
@ -570,7 +570,7 @@ Process* Process::create_kernel_process(String&& name, void (*e)())
return process;
}
Process::Process(String&& name, uid_t uid, gid_t gid, pid_t ppid, RingLevel ring, RetainPtr<Vnode>&& cwd, RetainPtr<Vnode>&& executable, TTY* tty, Process* fork_parent)
Process::Process(String&& name, uid_t uid, gid_t gid, pid_t ppid, RingLevel ring, RetainPtr<Inode>&& cwd, RetainPtr<Inode>&& executable, TTY* tty, Process* fork_parent)
: m_name(move(name))
, m_pid(next_pid++) // FIXME: RACE: This variable looks racy!
, m_uid(uid)
@ -1075,6 +1075,10 @@ ssize_t Process::sys$read(int fd, void* outbuf, size_t nread)
auto* descriptor = file_descriptor(fd);
if (!descriptor)
return -EBADF;
#ifdef DEBUG_IO
dbgprintf(" > descriptor:%p, is_blocking:%u, can_read:%u\n", descriptor, descriptor->is_blocking(), descriptor->can_read(*this));
dbgprintf(" > inode:K%x, device:K%x\n", descriptor->inode(), descriptor->character_device());
#endif
if (descriptor->is_blocking()) {
if (!descriptor->can_read(*this)) {
m_blocked_fd = fd;
@ -1252,7 +1256,7 @@ int Process::sys$chdir(const char* path)
return error;
if (!descriptor->is_directory())
return -ENOTDIR;
m_cwd = descriptor->vnode();
m_cwd = descriptor->inode();
return 0;
}