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Kernel: Rewrite ProcFS.

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Now the filesystem is generated on-the-fly instead of manually adding and
removing inodes as processes spawn and die.

The code is convoluted and bloated as I wrote it while sleepless. However,
it's still vastly better than the old ProcFS, so I'm committing it.

I also added /proc/PID/fd/N symlinks for each of a process's open fd's.
This commit is contained in:
Andreas Kling 2019-02-03 12:33:11 +01:00
parent ab56f36bfb
commit 5e9ba2ac84
13 changed files with 1133 additions and 468 deletions
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19
Kernel/Process.cpp
View file

@ -10,7 +10,6 @@
#include "MemoryManager.h"
#include "i8253.h"
#include "RTC.h"
#include "ProcFileSystem.h"
#include <AK/StdLibExtras.h>
#include <LibC/signal_numbers.h>
#include <LibC/errno_numbers.h>
@ -60,13 +59,23 @@ void Process::initialize()
initialize_gui_statics();
}
Vector<pid_t> Process::all_pids()
{
InterruptDisabler disabler;
Vector<pid_t> pids;
pids.ensure_capacity(g_processes->size_slow());
for (auto* process = g_processes->head(); process; process = process->next())
pids.unchecked_append(process->pid());
return pids;
}
Vector<Process*> Process::all_processes()
{
InterruptDisabler disabler;
Vector<Process*> processes;
processes.ensure_capacity(g_processes->size_slow());
for (auto* process = g_processes->head(); process; process = process->next())
processes.append(process);
processes.unchecked_append(process);
return processes;
}
@ -266,8 +275,6 @@ Process* Process::fork(RegisterDump& regs)
dbgprintf("fork: child will begin executing at %w:%x with stack %w:%x\n", child->m_tss.cs, child->m_tss.eip, child->m_tss.ss, child->m_tss.esp);
#endif
ProcFS::the().add_process(*child);
{
InterruptDisabler disabler;
g_processes->prepend(child);
@ -507,8 +514,6 @@ Process* Process::create_user_process(const String& path, uid_t uid, gid_t gid,
return nullptr;
}
ProcFS::the().add_process(*process);
{
InterruptDisabler disabler;
g_processes->prepend(process);
@ -571,7 +576,6 @@ Process* Process::create_kernel_process(String&& name, void (*e)())
g_processes->prepend(process);
system.nprocess++;
}
ProcFS::the().add_process(*process);
#ifdef TASK_DEBUG
kprintf("Kernel process %u (%s) spawned @ %p\n", process->pid(), process->name().characters(), process->m_tss.eip);
#endif
@ -703,7 +707,6 @@ Process::Process(String&& name, uid_t uid, gid_t gid, pid_t ppid, RingLevel ring
Process::~Process()
{
InterruptDisabler disabler;
ProcFS::the().remove_process(*this);
system.nprocess--;
if (g_last_fpu_process == this)