path: root/fs/nfs/delegation.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * linux/fs/nfs/delegation.c
 *
 * Copyright (C) 2004 Trond Myklebust
 *
 * NFS file delegation management
 *
 */
#include <linux/completion.h>
#include <linux/kthread.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/iversion.h>

#include <linux/nfs4.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_xdr.h>

#include "nfs4_fs.h"
#include "nfs4session.h"
#include "delegation.h"
#include "internal.h"
#include "nfs4trace.h"

#define NFS_DEFAULT_DELEGATION_WATERMARK (5000U)

static atomic_long_t nfs_active_delegations;
static unsigned nfs_delegation_watermark = NFS_DEFAULT_DELEGATION_WATERMARK;

static void __nfs_free_delegation(struct nfs_delegation *delegation)
{
	put_cred(delegation->cred);
	delegation->cred = NULL;
	kfree_rcu(delegation, rcu);
}

static void nfs_mark_delegation_revoked(struct nfs_delegation *delegation)
{
	if (!test_and_set_bit(NFS_DELEGATION_REVOKED, &delegation->flags)) {
		delegation->stateid.type = NFS4_INVALID_STATEID_TYPE;
		atomic_long_dec(&nfs_active_delegations);
		if (!test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
			nfs_clear_verifier_delegated(delegation->inode);
	}
}

static struct nfs_delegation *nfs_get_delegation(