// SPDX-License-Identifier: GPL-2.0
/*
* linux/fs/file.c
*
* Copyright (C) 1998-1999, Stephen Tweedie and Bill Hawes
*
* Manage the dynamic fd arrays in the process files_struct.
*/
#include <linux/syscalls.h>
#include <linux/export.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/sched/signal.h>
#include <linux/slab.h>
#include <linux/file.h>
#include <linux/fdtable.h>
#include <linux/bitops.h>
#include <linux/spinlock.h>
#include <linux/rcupdate.h>
#include <linux/close_range.h>
#include <linux/file_ref.h>
#include <net/sock.h>
#include <linux/init_task.h>
#include "internal.h"
static noinline bool __file_ref_put_badval(file_ref_t *ref, unsigned long cnt)
{
/*
* If the reference count was already in the dead zone, then this
* put() operation is imbalanced. Warn, put the reference count back to
* DEAD and tell the caller to not deconstruct the object.
*/
if (WARN_ONCE(cnt >= FILE_REF_RELEASED, "imbalanced put on file reference count")) {
atomic_long_set(&ref->refcnt, FILE_REF_DEAD);
return false;
}
/*
* This is a put() operation on a saturated refcount. Restore the
* mean saturation value and tell the caller to not deconstruct the
* object.
*/
if (cnt > FILE_REF_MAXREF)
atomic_long_set(&ref->refcnt, FILE_REF_SATURATED);
return false;
}
/**
* __file_ref_put - Slowpath of file_ref_put()
* @ref: Pointer to the reference count
* @cnt: Current reference count
*
* Invoked when the reference count is outside of the valid zone.
*
* Return:
* True if this was the last reference with no future references
* possible. This signals the caller that it can safely schedule the
* object, which is protected by the reference counter, for<